阅读说明：本技术 径向励磁电磁滑环式自动平衡装置 (Radial excitation electromagnetic slip ring type automatic balancing device ) 是由 潘鑫 吴海琦 何啸天 江志农 高金吉 于 2019-10-30 设计创作，主要内容包括：本发明径向励磁电磁滑环式自动平衡装置包括：外壳、动环、静环、连接轴承和控制器，动环包括：外励磁环、内励磁环、配重盘、第一配重块、第二配重块和动环轴承；静环包括：定子、励磁骨架和线圈；动环和静环均装在外壳内，并通过连接轴承相连，在外壳的中央装有定子，在定子两端分别固定有励磁骨架，外励磁环外壁固定在外壳内壁上，在外励磁环圆周上均匀分布有若干个外励磁环内齿，内励磁环固定在外壳的中间隔板上，在内励磁环圆周上均匀分布有若干个内励磁环外齿，配重盘套装在动环轴承上，配重盘的外圆周上有凸起圆环，圆环上加工有安装永磁磁铁的孔组和装有软铁的孔组，该凸起圆环伸入到外励磁环内齿和内励磁环外齿之间。(The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: shell, rotating ring, quiet ring, connection bearing and controller, the rotating ring includes: the outer excitation magnetic ring, the inner excitation magnetic ring, the counterweight plate, the first counterweight block, the second counterweight block and the moving ring bearing; the stationary ring includes: the stator, the excitation framework and the coil; the movable ring and the static ring are both arranged in the shell and are connected through a connecting bearing, a stator is arranged in the center of the shell, excitation frameworks are respectively fixed at two ends of the stator, the outer wall of the outer excitation ring is fixed on the inner wall of the shell, a plurality of outer excitation ring inner teeth are uniformly distributed on the circumference of the outer excitation ring, an inner excitation ring is fixed on a middle partition plate of the shell, a plurality of inner excitation ring outer teeth are uniformly distributed on the circumference of the inner excitation ring, a balance weight disc is sleeved on the movable ring bearing, a raised circular ring is arranged on the outer circumference of the balance weight disc, a hole group for mounting a permanent magnet and a hole group for mounting soft iron are processed on the circular ring, and the raised circular ring extends into the space between the outer excitation ring inner teeth and the.)

1. A radial excitation electromagnetic slip ring type automatic balancing device comprises: shell (1), rotating ring, quiet ring, connection bearing (27) and controller (13), the rotating ring includes: the excitation device comprises an outer excitation magnetic ring (2), an inner excitation magnetic ring (3), a counterweight plate (4), a first counterweight block (5), a second counterweight block (25) and a movable ring bearing (9); the stationary ring includes: a stator (10), an excitation frame (8) and a coil (26); the movable ring and the static ring are both arranged in the shell (1) and are connected by a connecting bearing (27); divide into two spaces by baffle (22) in shell (1), along shell (1) axial direction, be equipped with stator (10) in the central authorities of shell (1), be fixed with excitation skeleton (8) respectively at stator (10) both ends in above-mentioned two spaces, coil (26) are equipped with in every excitation skeleton (8), controller (13) link to each other with every coil (26) through the wire respectively, be equipped with a rotating ring in the space that coil (26), shell (1), baffle (22) and stator (10) enclose respectively, its characterized in that: the outer wall of an outer excitation magnetic ring (2) is fixed on the inner wall of a shell (1), an even number (2N) of outer excitation magnetic ring inner teeth (24) are uniformly distributed on the circumference of the outer excitation magnetic ring (2), the inner excitation magnetic ring (3) is fixed on a middle partition plate (22) of the shell (1), the inner excitation magnetic ring (3) and the outer excitation magnetic ring (2) rotate coaxially, the inner diameter of the inner excitation magnetic ring (3) is connected with a stator (10) through a connecting bearing (11) and keeps clearance fit, an even number (2N) of inner excitation ring outer teeth (23) are uniformly distributed on the circumference of the inner excitation magnetic ring (3), the number of the outer excitation inner teeth (24) is equal to that of the inner excitation ring outer teeth (23), the outer excitation inner excitation ring inner teeth (24) and the number of the inner excitation ring outer teeth (23) are axially arranged on the shell (1), a counterweight magnetic ring (24) corresponds to the inner excitation ring outer teeth (23), a movable ring bearing (9), a first balancing weight (5) and a second balancing weight (25) are respectively arranged on two sides of a counterweight plate (4), a raised circular ring (28) is arranged on the outer circumference of the counterweight plate (4), the raised circular ring (28) extends between the inner teeth (24) of an outer excitation magnetic ring and the outer teeth (23) of an inner excitation magnetic ring, a plurality of holes are formed in the raised circular ring (28), the plurality of holes are divided into a hole group provided with permanent magnets (20) and a hole group provided with soft irons (21), and the hole group provided with the permanent magnets (20) and the hole group provided with the soft irons (21) are alternately and sequentially arranged along the circumference of the raised circular ring (28).

2. The radially excited electromagnetic slip ring type automatic balancing apparatus as set forth in claim 1: the method is characterized in that: the magnetic field excitation magnet structure is characterized in that even holes are formed in the hole groups of the permanent magnets (20), the distance between every two holes is equal, a permanent magnet (20) is installed in each hole, the N pole of the permanent magnet (20) in one hole faces towards the inner excitation magnet ring outer teeth (23), the S pole faces towards the outer excitation magnet ring inner teeth (24), the S pole of the permanent magnet (20) in the adjacent hole faces towards the inner excitation magnet ring outer teeth (23), the N pole faces towards the outer excitation magnet ring inner teeth (24), even holes are formed in the hole groups of the soft iron (21), the distance between every two holes is equal to the hole distance in the hole groups of the permanent magnets (20), and the distance between the hole groups provided with the permanent magnets (20) and the hole groups provided with the soft iron (21) is 1.5 times of the hole group inner hole distance of the permanent magnets (20) or the hole group inner hole distance of the soft iron (21).

3. The radially excited electromagnetic slip ring type automatic balancing apparatus as set forth in claim 2, wherein: the rotating ring further comprises: the movable bearing comprises a movable ring end cover (6), a movable bearing outer ring positioning sleeve (29) and a movable bearing inner ring positioning sleeve (30), wherein the movable ring end cover (6) is fixed on the inner circumference of an outer excitation magnetic ring (2) on one side of a counterweight disc (4), the movable bearing outer ring positioning sleeve (29) and the movable bearing inner ring positioning sleeve (30) are arranged in a space defined by an excitation framework (8), the movable ring end cover (6), an inner excitation magnetic ring (3) and a movable ring bearing (9), the movable bearing outer ring positioning sleeve (29) is sleeved on the counterweight disc (4), one end of the movable bearing outer ring positioning sleeve props against the outer ring of the movable ring bearing (9), the movable bearing inner ring positioning sleeve (30) is sleeved on the inner excitation magnetic ring (3), and one end of the movable bearing inner ring positioning sleeve props against the.

4. The radially excited electromagnetic slip ring type automatic balancing apparatus as set forth in claim 3, wherein: the radial excitation electromagnetic slip ring type automatic balancing device further comprises: bearing fastener (11) and excitation skeleton end cover (7), be equipped with between the outer circumference of stator (10) and interior excitation magnetic ring (3) and connect bearing (27), connect bearing (27) suit on stator (10), the one end of connecting bearing (27) withstands stator (10) and interior excitation magnetic ring (3), be equipped with bearing fastener (11) on the other end of connecting bearing (27), excitation skeleton end cover (7) are fixed on excitation skeleton (8) between excitation skeleton (8) and rotating ring end cover (6).

5. The radially excited electromagnetic slip ring type automatic balancing apparatus as set forth in claim 4, wherein: the first balancing weight (5) and the second balancing weight (25) are semicircular disc-shaped parts and are respectively arranged on two sides of each balancing weight disc (4).

6. The radially excited electromagnetic slip ring type automatic balancing apparatus as set forth in claim 5, wherein: a shell (1) covering the outer side of an excitation framework (8) is provided with a reference magnet (16), a reference Hall element (17) is arranged at a corresponding position of the excitation framework (8), and the reference Hall element (17) senses the position of the reference magnet (16) and is connected with a controller (13) through a lead.

7. The radially excited electromagnetic slip ring type automatic balancing apparatus as set forth in claim 6, wherein: each first balancing weight (5) close to the coil (26) is provided with a positioning magnet (19), a positioning Hall element (18) is arranged at the corresponding position of the excitation framework end cover (7), and the positioning Hall element (18) induces the position of the positioning magnet (19) and is connected with the controller (13) through a lead.

8. The radially excited electromagnetic slip ring type automatic balancing apparatus as claimed in claim 7, wherein: the partition plate (22) is integrated with the shell (1).

9. The radially excited electromagnetic slip ring type automatic balancing apparatus as claimed in claim 8, wherein: the stator (10), the excitation framework (8), the outer excitation magnetic ring (2), the inner excitation magnetic ring (3) and the movable bearing outer ring positioning sleeve (29) are made of soft magnetic materials; the shell (1) and the counterweight plate (4) are made of magnetism isolating materials, and the first counterweight block (5) and the second counterweight block (25) are made of tungsten-copper alloy, brass, stainless steel or aluminum alloy materials.

10. The radially excited electromagnetic slip ring type automatic balancing apparatus as claimed in claim 9, wherein: the radial excitation electromagnetic slip ring type automatic balancing device is fixed at the shaft end of the rotating device (14) through a connecting flange (15).

Technical Field

The invention relates to an automatic balancing device, in particular to a radial excitation electromagnetic slip ring type automatic balancing device.

Background

The vibration exceeding caused by the unbalanced rotor mass is the most frequent fault of the rotating machinery, and seriously affects the operation efficiency, the working precision, the service life and the like of equipment, and the automatic balancing device can automatically inhibit the unbalanced fault of the rotating equipment on line, has high balancing speed, does not need equipment shutdown in the balancing process, and is always considered as an effective scheme for solving the unbalanced vibration fault.

The electromagnetic slip ring type automatic balancing device is an active balancing actuator which drives a balancing weight to rotate by utilizing electromagnetic force, and is proposed for the first time in 1998 by dye s.w. of company BalaDyne, Blance Dynamics, usa. The automatic balancing device has the advantages of no need of a complex auxiliary system, simplicity in operation and high balancing speed, the machining precision requirement on internal parts is reduced, the manufacturing difficulty is low, electric energy and control signals are not required to be transmitted between moving and static parts in the working process, the use of abrasion parts such as electric brushes is fundamentally avoided, and the service life of the equipment is longer. However, the movable ring and the static ring in the traditional balancing device adopt a two-body structure, the movable ring and the static ring need to be installed respectively in the installation process, the gap between the movable ring and the static ring is about 0.5mm, and the installation and the use are difficult. Although the integrated electromagnetic sliding ring type automatic balance structure does not need to adjust the gap between the movable ring and the static ring during installation, the installation difficulty of the product is greatly reduced, due to the adoption of the axial excitation structure, when the stress of the weight disc is overlarge, the weight disc can deviate and collide and grind with the excitation ring, and the balance process is interfered.

The invention is characterized in that an axial excitation structure is improved into a radial excitation structure on the basis of an integrated electromagnetic slip ring type automatic balance structure, the problems of deflection and collision and abrasion with an excitation ring in the rotation process of a counterweight plate are solved, and a permanent magnet and soft iron are jointly driven, so that the driving capability is effectively increased and the operation stability and reliability of a balance device are improved on the premise that the self-locking force meets the requirement.

Disclosure of Invention

The invention aims to solve the problems of the existing axial excitation structure, and provides a radial excitation electromagnetic slip ring type automatic balancing device.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: shell, rotating ring, quiet ring, connection bearing and controller, the rotating ring includes: the outer excitation magnetic ring, the inner excitation magnetic ring, the counterweight plate, the first counterweight block, the second counterweight block and the moving ring bearing; the stationary ring includes: the stator, the excitation framework and the coil; the movable ring and the static ring are both arranged in the shell and are connected by a connecting bearing (); the shell is divided into two spaces by a partition board, a stator is arranged in the center of the shell along the axial direction of the shell, excitation frameworks are respectively fixed at two ends of the stator in the two spaces, a coil is arranged in each excitation framework, a controller is respectively connected with each coil through a lead, and a moving ring is respectively arranged in the space enclosed by the coil, the shell, the partition board and the stator, wherein: the outer wall of the outer excitation magnetic ring is fixed on the inner wall of the shell, the circumference of the outer excitation magnetic ring is uniformly distributed with an even number of 2N inner teeth of the outer excitation magnetic ring, the inner excitation magnetic ring is fixed on the middle partition plate of the shell, the inner excitation magnetic ring and the outer excitation ring coaxially rotate, the inner diameter of the inner excitation magnetic ring is connected with the stator through a connecting bearing and keeps clearance fit, the circumference of the inner excitation magnetic ring is uniformly distributed with an even number of 2N outer teeth of the inner excitation ring, the number of the inner teeth of the outer excitation magnetic ring is equal to that of the outer teeth of the inner excitation ring, the inner teeth of the outer excitation magnetic ring and the outer teeth of the inner excitation ring are mutually corresponding in the axial direction of the shell, the other end of the inner excitation magnetic ring is provided with a movable ring bearing, a balance weight disc is fixed on the outer ring of the movable ring bearing, the two sides of the balance weight disc are respectively provided with a first balance weight and, the convex ring is provided with a plurality of holes, the holes are divided into a hole group provided with permanent magnets and a hole group provided with soft iron, and the hole groups provided with the permanent magnets and the hole groups provided with the soft iron are arranged in sequence at intervals along the circumference of the convex ring.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the permanent magnet hole group is internally provided with an even number of holes, the distance between every two holes is equal, each hole is internally provided with a permanent magnet, the N pole of the permanent magnet in one hole faces towards the external teeth of the inner exciting ring, the S pole faces towards the internal teeth of the outer exciting ring, the S pole of the permanent magnet in the adjacent hole faces towards the external teeth of the inner exciting ring, the N pole faces towards the internal teeth of the outer exciting ring, the hole group of the soft iron is internally provided with an even number of holes, the distance between every two holes is equal to the hole distance in the hole group of the permanent magnet, and the distance between the hole group provided with the permanent magnet and the hole group provided with the soft iron is 1.5 times of the hole distance in the hole group of the permanent magnet or the hole distance in the hole group of the.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the rotating ring further comprises: the movable bearing comprises a movable ring end cover, a movable bearing outer ring positioning sleeve and a movable bearing inner ring positioning sleeve, wherein the movable ring end cover is fixed on the inner circumference of an outer excitation magnetic ring on one side of a counterweight disc, the movable bearing outer ring positioning sleeve and the movable bearing inner ring positioning sleeve are arranged in a space defined by an excitation framework, the movable ring end cover, an inner excitation magnetic ring and a movable ring bearing, the movable bearing outer ring positioning sleeve is sleeved on the counterweight disc, one end of the movable bearing outer ring positioning sleeve abuts against the outer ring of the movable ring bearing, the movable bearing inner ring positioning sleeve is sleeved on the inner excitation magnetic ring, and one end of the movable bearing inner ring positioning sleeve abuts against the.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the radial excitation electromagnetic slip ring type automatic balancing device further comprises: the excitation structure comprises a bearing fastener and an excitation framework end cover, wherein a connecting bearing is arranged between the outer circumference of a stator and an inner excitation ring, the connecting bearing is sleeved on the stator, one end of the connecting bearing props against the stator and the inner excitation ring, the bearing fastener is arranged at the other end of the connecting bearing, and the excitation framework end cover is fixed on an excitation framework between the excitation framework and a movable ring end cover.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the first balancing weight and the second balancing weight are semicircular disc-shaped parts which are respectively arranged on two sides of each balancing weight plate.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the shell covering the outer side of the excitation framework is provided with a reference magnet, a reference Hall element is arranged at the corresponding position of the excitation framework, and the reference Hall element senses the position of the reference magnet and is connected with a controller through a lead.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: each first balancing weight close to the coil is provided with a positioning magnet, a positioning Hall element is arranged at the corresponding position of the end cover of the excitation framework, and the positioning Hall element senses the position of the positioning magnet and is connected with the controller through a lead.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the baffle is integrated with the housing.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the stator, the excitation framework, the external excitation magnetic ring, the internal excitation magnetic ring and the movable bearing outer ring positioning sleeve are made of soft magnetic materials; the shell and the counterweight plate are made of magnetism isolating materials, and the first counterweight block and the second counterweight block are made of tungsten-copper alloy, brass, stainless steel or aluminum alloy materials.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device, which comprises: the radial excitation electromagnetic slip ring type automatic balancing device is fixed at the shaft end of the rotating device through a connecting flange.

The invention relates to a radial excitation electromagnetic slip ring type automatic balancing device which is arranged at the end part of a rotating shaft of a rotating device, in the working process, a controller inputs positive and negative alternative driving voltage to a coil, a static ring generates an alternating magnetic field on the side surface of a dynamic ring according to the driving voltage, an inner excitation magnetic ring and an outer excitation magnetic ring in the dynamic ring are quickly magnetized under the action of the magnetic field, and the balance weight discs in the dynamic ring are driven to rotate step by step relative to the rotating device under the action of electromagnetic force by utilizing the interaction force between the inner excitation magnetic ring and the outer excitation magnetic ring and permanent magnets and soft irons on the balance weight discs, and because the two balance weight discs are provided with eccentric mass blocks with the same balancing capacity, the phase position of the central lines of the two eccentric mass blocks and the included angle between the balance weight blocks are adjusted by the step rotation of the two balance weight discs, the mass distribution in the balancing device can be changed on, the unbalanced vibration of the rotated device is suppressed online. Compared with the traditional axial excitation structure, the radial excitation structure solves the problem of the beat collision and grinding between the inner excitation magnetic ring and the outer excitation ring of the counterweight plate, the fit clearance between the counterweight plate and the inner excitation magnetic ring and the outer excitation magnetic ring can be smaller, and the soft iron is used for replacing part of permanent magnets, so that the radial excitation structure has competitive advantages in the aspects of balance capacity, balance speed, stability and the like.

Drawings

FIG. 1 is a schematic cross-sectional view of an automatic balancing device for a radial excitation electromagnetic slip ring according to the present invention;

FIG. 2 is a schematic view of the matching relationship of the outer excitation ring, the inner excitation ring and the weight plate at the position A-A of FIG. 1;

FIG. 3 is an enlarged partial magnetic circuit analysis diagram of the automatic balancing device of the radial excitation electromagnetic slip ring of the invention;

FIG. 4 is an enlarged magnetic circuit analysis diagram of the outer excitation magnetic ring, the inner excitation magnetic ring and the counterweight plate in the self-locking state of the automatic balancing device of the radial excitation electromagnetic slip ring of the invention;

FIG. 5 is a schematic diagram of the matching relationship of the outer excitation magnetic ring, the inner excitation magnetic ring and the counterweight plate at the middle position of the stepping state of the automatic balancing device for the radial excitation electromagnetic slip ring of the invention;

fig. 6 is a schematic diagram of the matching relationship of the outer excitation magnetic ring, the inner excitation magnetic ring and the counterweight plate at the final position of the stepping state of the automatic balancing device for the radial excitation electromagnetic slip ring of the invention.

In fig. 1 to 6, reference numeral 1 is a housing; the reference numeral 2 is an external excitation magnetic ring; reference numeral 3 is an inner excitation magnetic ring; reference numeral 4 is a weight plate; reference numeral 5 is a first weight member; reference numeral 6 is a movable ring end cover; reference numeral 7 is an excitation skeleton end cover; reference numeral 8 denotes an excitation bobbin; reference numeral 9 is a rotating ring bearing; reference numeral 10 is a stator; reference numeral 11 is a bearing fastener; reference numeral 12 is a lock nut; reference numeral 13 is a controller; reference numeral 14 is a rotating device; reference numeral 15 is a connecting flange; reference numeral 16 is a reference magnet; reference numeral 17 is a reference hall element; reference numeral 18 is a positioning hall element; reference numeral 19 is a positioning magnet; reference numeral 20 is a permanent magnet; reference numeral 21 is soft iron; reference numeral 22 is a separator; reference numeral 23 is an external tooth of the internal exciting ring; reference numeral 24 is the inner teeth of the outer excitation magnetic ring; reference numeral 25 is a second weight member; reference numeral 26 is a coil; reference numeral 27 is a connection bearing; reference numeral 28 is a convex ring; reference numeral 29 is a movable bearing outer ring positioning sleeve; reference numeral 30 is a movable bearing inner ring positioning sleeve.

Detailed Description

As shown in fig. 1, the radial excitation electromagnetic slip ring type automatic balancing apparatus of the present invention is fixed to the shaft end of a rotating apparatus 14 through a connecting flange 15, and includes: including the rotating ring, the stationary ring, the controller 13 and the connecting bearing 27. The dynamic ring and the static ring are both arranged in the shell 1.

The rotating ring includes: the device comprises a shell 1, an external excitation magnetic ring 2, an internal excitation ring 3, a counterweight plate 4, a first counterweight block 5, a second counterweight block 25, a moving ring bearing 9, a moving ring end cover 6, a bearing outer ring positioning sleeve 29 and a bearing inner ring positioning sleeve 30; the stationary ring includes: stator 10, excitation skeleton 2, excitation skeleton end cover 7 and coil 26. The dynamic ring and the static ring are both arranged in the shell 1.

The inner excitation ring is divided into two spaces by a partition plate 22 in the shell 1, the shell 1 and the partition plate 22 are integrated, the two inner excitation rings 3 are respectively fixed on the partition plate 22 of the shell 1 through bolts, and a plurality of inner excitation ring outer teeth 23 are uniformly distributed on the circumference of the inner excitation ring 3. The first balancing weight 5 and the second balancing weight 25 are semicircular disc-shaped parts and are respectively arranged on the inner side and the outer side of the balancing weight plate 4. The movable ring end cover 6 is fixed on the inner circumference of the outer excitation magnetic ring 2 on one side of the counterweight plate 4, and plays the roles of separating the movable ring from the static ring and preventing dust. The movable ring bearing 9 is arranged in a bearing hole of the counterweight plate 4, the first counterweight block 5, the second counterweight block 25 and the movable ring bearing 9 are integrally sleeved on the outer ring of the inner exciting ring 3 and are positioned through the movable ring bearing 9 and a stepped shaft on the inner exciting ring 3, and the stepped shaft is a stator 10. A bearing outer ring positioning sleeve 29 and a bearing inner ring positioning sleeve 30 are fixed on the outer side of the movable ring bearing 9, the movable bearing outer ring positioning sleeve 29 is sleeved on the counterweight plate 4, one end of the movable bearing outer ring positioning sleeve 29 props against the outer ring of the movable ring bearing 9 and is used for positioning the movable ring bearing 9 in foreign countries, the movable ring bearing 9 outer ring and the counterweight plate 4 are prevented from moving relatively, and in addition, the sealing effect of the movable ring bearing 9 is achieved. The movable bearing inner ring positioning sleeve 30 is sleeved on the inner excitation ring 3, one end of the movable bearing inner ring positioning sleeve props against the inner ring of the movable ring bearing 9, and the movable bearing inner ring positioning sleeve is used for positioning the inner ring of the movable ring bearing 9 and preventing the inner ring of the movable ring bearing 9 and the inner excitation ring 3 from moving relatively.

The outer wall of the outer excitation magnetic ring 2 is fixed on the inner wall of the shell 1, and a plurality of inner teeth 24 of the outer excitation magnetic ring are uniformly distributed on the circumference of the outer excitation magnetic ring 2. The number of the outer excitation magnetic ring inner teeth 24 is equal to that of the inner excitation ring outer teeth 23, the number of the teeth is 24, the teeth are rectangular, and the outer excitation magnetic ring inner teeth 24 and the inner excitation ring outer teeth 23 are in one-to-one correspondence along the radial direction of the shell 1. The outer ring of the stator 10 and the inner diameter of the inner exciting ring 3 are installed in a clearance fit mode. The inner ring of the connecting bearing 27 is matched with the outer surface of the stator 10, the outer ring of the connecting bearing is matched with a bearing hole of the inner exciting ring 3, and a bearing fastener 11 is arranged outside the connecting bearing 27.

A stator 10 is mounted at the center of the housing 1 along the axial direction of the housing 1, excitation bobbins 8 are fixed to both ends of the stator 10, respectively, and an annular coil 26 is mounted inside each excitation bobbin 8. The excitation framework end cover 7 is fixed in a groove on the end face of the excitation framework 8. The excitation bobbin 8, the coil 26, and the excitation bobbin end cover 7 are integrally mounted on the stator 10, and the outside is fixed to the stator 10 by a lock nut 12.

As shown in fig. 2, a raised ring 28 is provided on the outer circumference of the weight plate 4, the raised ring 28 extends between the inner teeth 24 of the outer field ring and the outer teeth 23 of the inner field ring, a plurality of holes are provided on the raised ring, the plurality of holes are divided into a group of holes provided with permanent magnets and a group of holes provided with soft iron, the group of holes provided with permanent magnets and the group of holes provided with soft iron are arranged in sequence at intervals along the circumference of the raised ring, 2, 4, 6 or 10 holes are provided in the group of holes provided with permanent magnets, the interval between each hole is equal, a permanent magnet is provided in each hole, the N pole of the permanent magnet in one hole faces the outer teeth of the inner field ring, the S pole faces the inner teeth of the outer field ring, the S pole of the permanent magnet in the adjacent hole faces the outer teeth of the inner field ring, the N pole faces the inner teeth of the outer field ring, holes are provided in the group of soft iron, the interval between each hole is equal and equal to the interval between the holes in the group, the distance between the hole group provided with the permanent magnet and the hole group provided with the soft iron is 1.5 times of the distance between the inner holes of the hole groups of the permanent magnet or the distance between the inner holes of the hole groups of the soft iron, and a first balancing weight and a second balancing weight are respectively arranged on two sides of the balancing weight plate. For example: the number of the external excitation magnetic ring internal teeth 24 and the internal excitation ring external teeth 23 is 24 respectively, the tooth profile of the external excitation magnetic ring internal teeth 24 and the internal excitation ring external teeth 23 is rectangular, the tooth width of the external excitation magnetic ring internal teeth 24 and the internal excitation ring external teeth 23 is the hole distance of two adjacent permanent magnets 20 or the hole distance of the soft iron 21, 4 hole groups provided with the permanent magnets 20 and 4 hole groups provided with the soft iron 21 are arranged on a convex circular ring 28 on the outer circumference of the counterweight disc 4, the permanent magnets 20 and the soft iron 21 are pressed into the holes through interference fit, the hole groups provided with the permanent magnets 20 and the soft iron 21 are symmetrically arranged on the outer circumference of the convex circular ring 28 respectively, and the gaps between the permanent magnets 20 and the soft iron 21 and the tooth crests of the external teeth 24 of the external excitation magnetic ring internal teeth and the external teeth 23 of the internal excitation magnetic ring are generally in the range of 0.3 mm-0.5 mm.

The stationary ring includes: stator 10, excitation skeleton 8, excitation skeleton end cover 7, coil 26. The stator 10 is a stepped shaft having a through hole formed in the middle thereof and threads formed at both ends thereof. The outer ring of the stator 10 and the inner diameter of the inner exciting ring 3 are installed in a clearance fit mode, and the clearance is within the range of 0.2-0.4 mm. The excitation bobbin 8 is formed in a chevron shape, and an annular coil 26 is mounted inside the excitation bobbin. The bottom of the excitation framework 8 is provided with a through hole for leading out and positioning the Hall sensing element 18 and the coil 26. And the excitation framework end cover 7 is fixed in a groove on the end surface of the excitation framework 8 and used for fixing the coil. The excitation framework 8, the coil 26 and the excitation framework end cover 7 are sleeved into the stator 10 together, one end of the excitation framework 8 is abutted against the bearing fastening piece 11, and the outer side of the excitation framework 8 is fixed on the stator 10 through the locking nut 12. The lead of the coil 26 at the inner side of the excitation framework 8 is led out from the through hole at the bottom of the excitation framework 8 at the inner side, passes through the through hole of the stator 10, is led into an aviation plug together with the lead of the coil 26 at the outer side, and is connected to the controller 13. The controller 13 is mounted on the outside of the balancing device.

The inner ring of the connecting bearing 27 is matched with the outer surface of the stator 10, and the outer ring of the connecting bearing is matched with a bearing hole of the inner exciting ring 3, so that the connecting bearing is used for connecting a movable ring and a static ring and ensuring the long-term stable operation of the movable ring and the static ring under a small gap. The bearing fastener 11 is installed outside the connecting bearing 27, and the bearing fastener 11 can control the gap between the excitation framework 8 and the moving ring through the axial length of the bearing fastener 11 and is fixedly connected with the inner ring of the bearing 27.

The shell 1 of the outer excitation framework 8 is provided with a reference magnet 16, a reference Hall element 17 is arranged at a corresponding position of the outer excitation framework 8, the reference Hall element 17 senses the position of the reference magnet 16, each first balancing weight 5 close to the coil 26 is provided with a positioning magnet 19, a groove is formed at a corresponding position of the excitation framework end cover 7, the positioning Hall element 18 is embedded into the groove of the excitation framework end cover 7, and the positioning Hall element 18 senses the position of the positioning magnet 19. The lead of the outer positioning Hall element 18 penetrates through a through hole at the bottom of the outer excitation framework 8, the inner positioning Hall element 18 is led out from the through hole at the bottom of the inner excitation framework 8, penetrates through a through hole of the stator 10, and is converged into an aviation plug together with the lead of the outer positioning Hall element 18. The aviation plug is led out two buses in total for distinguishing strong current from weak current, the coil 26 leads are led into a strong current bus, the reference Hall element 17 and the positioning Hall element 18 leads are led into a weak current bus, and the strong current bus and the weak current bus are connected with the controller 13. The reference hall element 17 and the positioning hall element 18 can detect the specific phase in which the two weight plates 4 are located.

The stator 10, the excitation framework 8, the external excitation magnetic ring 2, the internal excitation ring 3 and the movable bearing outer ring positioning sleeve 29 are made of soft magnetic materials; the shell 1 and the counterweight plate 4 are made of magnetic-isolating materials such as aluminum alloy, and the first counterweight block 5 and the second counterweight block 25 are made of tungsten-copper alloy, brass, stainless steel or aluminum alloy materials.

During operation, the stationary ring does not rotate with the follower ring. When the balancing device needs to act, the static ring generates an alternating magnetic field on the side surface of the moving ring under the action of a control signal, the core component balance weight disc 4 in the moving ring and the outer ring of the moving ring bearing 9 connected with the balance weight disc are driven to rotate in a stepping mode relative to the outer excitation magnetic ring 2 and the inner excitation ring 3 of the moving ring, the first balancing weight 5 and the second balancing weight 25 are driven to form required compensation mass, and unbalanced vibration of the main shaft of the rotating device 14 is restrained on line.

The automatic balancing device of the radial excitation electromagnetic slip ring is of an axisymmetric structure, as shown in figure 4, a quarter structure of the device is taken for magnetic circuit analysis, and the transmission principle of the magnetic circuit is explained as follows: the excitation framework 8 of the static ring, the stator 10 of the static ring, the external excitation ring 2 of the dynamic ring, the internal excitation ring 3 and the positioning sleeve 29 of the dynamic bearing outer ring are all made of soft magnetic materials and jointly form a closed magnetic circuit, and the closing direction of the magnetic circuit is determined by the positive and negative of the driving voltage supplied to the coil 26 by the controller 13. In the working process, the coil 26 is electrified to generate a magnetic field, the magnetic field vertically penetrates through a gap between the movable ring and the stationary ring along the arrow direction in the figure after being strengthened by the excitation framework 8, and the outer excitation magnetic ring 2 and the inner excitation ring 3 are magnetized, so that the outer excitation magnetic ring 2 and the inner excitation ring 3 form an N pole and an S pole respectively; according to the principle that like poles repel and opposite poles attract magnets, the outer excitation magnetic ring 2 and the inner excitation ring 3 interact with the magnets on the counterweight plate 4, and then the counterweight plate 4 is driven to rotate in a stepping mode relative to other parts of the rotating ring; the magnetic circuit returns to the excitation framework 8 through the inner excitation ring 3, the movable bearing outer ring positioning sleeve 29 and the stator 10 to form a closed magnetic circuit loop.

The outer excitation magnetic ring 2 and the inner excitation ring 3 are made of soft magnetic materials, when the static ring generates a magnetic field, the outer excitation ring 2 and the inner excitation ring 3 are quickly magnetized to drive the counterweight plate 4 to perform stepping action, when the static ring magnetic field is cancelled, the magnetic field of the outer excitation magnetic ring 2 is quickly disappeared, and the counterweight plate 4 continues to move to the next self-locking state under the inertia effect. The inner ring of the outer excitation magnetic ring 2 and the outer ring of the inner excitation ring 3 are respectively provided with 24 radially raised outer excitation magnetic ring inner teeth 24 and inner excitation ring outer teeth 23, the tooth profile is rectangular, the tooth width is the distance between the adjacent permanent magnets 20 or the adjacent soft iron 21, the tooth thickness is slightly larger than the length of the permanent magnets/soft iron blocks, and the tooth tops of the outer excitation magnetic ring inner teeth 24 and the tooth tops of the inner excitation ring outer teeth 23 are required to be in one-to-one correspondence in the assembling process.

The material of the balance weight disk 4 is aluminum alloy, a convex ring 28 is arranged on the outer circumference of the balance weight disk 4, 44 long cylindrical holes are processed along the radial direction of the convex ring 28 and are respectively used for installing the cylindrical soft iron 21 and the permanent magnets 20, the polarities of the adjacent permanent magnets 20 are opposite, and the permanent magnets are used for self-locking of the balance weight disk 4 and driving of an external magnetic field. The inner ring of the balance weight disk 4 is connected with the outer ring of the movable ring bearing 9, and the two sides of the balance weight disk are respectively provided with a first balance weight 5 and a second balance weight 25 which are semi-circular eccentric. The balance weight disc 4 is positioned at the middle position between the outer excitation ring 2 and the inner excitation ring 3, and the clearance between the balance weight disc and the tooth top of the inner teeth 24 of the outer excitation ring or the tooth top of the outer teeth 23 of the inner excitation ring is generally 0.3 mm-0.5 mm. The cylindrical permanent magnets 20 and the soft irons 21 are pressed into the long cylindrical hole of the counterweight plate 4 through interference connection, every two adjacent permanent magnets 20 are a pair and correspond to one tooth top of the outer excitation magnetic ring 2 and one tooth bottom of the inner excitation magnetic ring 3, and the adjacent soft irons 21 respectively correspond to one tooth top and one tooth bottom of the outer excitation magnetic ring 2 and the inner excitation magnetic ring 3.

As shown in fig. 4, in the self-locking state, under the condition of no external magnetic field, the magnetic fields formed by the permanent magnet 20, the external excitation ring 2 and the internal excitation ring 3 make the permanent magnet 20, the external excitation ring 2 and the internal excitation ring 3 have mutually attracted self-locking force, so as to ensure that the counterweight plate 4 rotates synchronously with the rotating device 14 and does not rotate relative to the rotating device 14 within a certain acceleration and deceleration when the rotating device 14 rotates at a constant speed and rotates at an acceleration and deceleration. The magnetic path of the permanent magnet 20 is: the magnetic flux is emitted from the N pole of one permanent magnet 20, passes through the outer teeth 23 of the inner excitation ring, returns to the S pole of the adjacent permanent magnet 20, passes through the permanent magnet 20, reaches the inner teeth 24 of the outer excitation ring on the other side, and finally returns to the S pole of the first permanent magnet 20 to form a closed loop. Referring to the principle of the magnetic drive technique, since the reluctance of the permanent magnetic field loop is at a minimum in this position, any slight movement of the weight plate 4 in any direction will generate a magnetic force on the weight plate 4 which will cause it to return to a stable equilibrium position, thereby preventing slippage of the weight plate 4. The permanent magnet 20 generates a force locking the outer exciting ring 2 and the inner exciting ring 3, namely a self-locking force, by the action of magnetic lines of force passing through the exciting ring. Under the action of the self-locking force, the counterweight plate 4 rotates together with the rotating device 14 and can not rotate relative to the rotating device 14 within a certain acceleration and deceleration, and the self-locking function of the counterweight plate 4 is realized.

Under the action of an external magnetic field, the external excitation magnet ring 2 and the internal excitation ring 3 are magnetized to generate corresponding S poles and N poles, the S poles and the N poles and the magnetic poles of the permanent magnet 20 have the functions of like-pole repulsion and opposite-pole attraction, and the attraction force and the repulsion force of each group of magnetic poles generate magnetic torque in the same direction relative to the center of the rotating shaft, so that the counterweight plate 4 moves anticlockwise. After the counterweight plate 4 rotates, the original stress balance between the soft iron 21 and the outer excitation ring 2 and the inner excitation ring 3 is broken, the soft iron 21 is attracted with the magnetized outer excitation ring 2 and the magnetized inner excitation ring 3 and moves towards the direction with the minimum magnetic resistance, and the soft iron 21 and the permanent magnet 20 jointly drive the counterweight 4 to continuously rotate anticlockwise and move from the position shown in fig. 2 to the middle position shown in fig. 5. At this time, the driving voltage needs to be cut off in time, and the weight plate 4 moves to the final position shown in fig. 6 under the action of self inertia force and self-locking force to complete one-step rotation operation. If the direction of the applied magnetic field is changed alternately, the weight plate 4 can move continuously in the anticlockwise direction.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.