阅读说明：本技术 一种长定子空芯绕组双边双馈直线电机结构 (Double-fed linear motor structure with long stator hollow winding and double sides ) 是由 王滢 刘学龙 刘方麟 刘世杰 陈绍宗 张昆仑 于 2021-03-03 设计创作，主要内容包括：本发明公开了一种长定子空芯绕组双边双馈直线电机结构,包括中间长定子空芯绕组、若干个U形连接件和位于两侧的第一动子和第二动子；第一动子和第二动子分别紧固在若干个U形连接件内侧,第一动子和第二动子结构对称,位置平行,且第一动子和第二动子均包括动子铁芯和叠绕在动子铁芯上的三相动子绕组；中间长定子空芯绕组与两侧的第一动子的距离为第一间隙,与第二动子的距离为第二间隙,第一间隙与第二间隙宽度相等,且中间长定子空芯绕组采用叠绕方式并通过非导电导磁材料固定于地面。本发明采用双边动子结构,动子侧所受法向力方向相反而抵消；且采用双馈控制方案,电机可同步或异步运行,速度可调节范围大。(The invention discloses a double-side double-fed linear motor structure with a long stator hollow winding, which comprises a middle long stator hollow winding, a plurality of U-shaped connecting pieces, a first rotor and a second rotor, wherein the first rotor and the second rotor are positioned on two sides; the first rotor and the second rotor are respectively fastened at the inner sides of the plurality of U-shaped connecting pieces, the first rotor and the second rotor are symmetrical in structure and parallel in position, and both the first rotor and the second rotor comprise rotor cores and three-phase rotor windings wound on the rotor cores in an overlapping mode; the distance between the middle long stator air-core winding and the first rotors on the two sides is a first gap, the distance between the middle long stator air-core winding and the second rotors is a second gap, the width of the first gap is equal to that of the second gap, and the middle long stator air-core winding is fixed on the ground in a lap winding mode through a non-conductive magnetic material. The invention adopts a bilateral rotor structure, and the normal force directions borne by the rotor side are opposite and offset; and a double-fed control scheme is adopted, the motor can run synchronously or asynchronously, and the speed adjustable range is large.)

1. The utility model provides a bilateral doubly-fed linear electric motor structure of long stator air core winding which characterized in that: the stator comprises a middle long stator hollow winding, a plurality of U-shaped connecting pieces, a first rotor and a second rotor, wherein the first rotor and the second rotor are positioned on two sides; the first rotor and the second rotor are respectively fastened at the inner sides of the plurality of U-shaped connecting pieces, the first rotor and the second rotor are symmetrical in structure and parallel in position, and both the first rotor and the second rotor comprise rotor cores and three-phase rotor windings wound on the rotor cores in an overlapping mode; the distance between the middle long stator air-core winding and the first rotors on the two sides is a first gap, the distance between the middle long stator air-core winding and the second rotors is a second gap, the width of the first gap is equal to that of the second gap, and the middle long stator air-core winding is fixed on the ground in a lap winding mode through a non-conductive magnetic material.

2. The structure of the double-fed double-side linear motor with the long stator air-core winding according to claim 1, is characterized in that: the middle long stator air-core winding comprises a three-phase alternating current winding and a non-conductive magnetic conduction material for winding shaping.

3. The long stator air core winding double-sided doubly-fed linear motor structure of claim 2, wherein: the middle long stator hollow winding is respectively composed of A, B, C three-phase alternating current windings, the phase sequence of the three-phase alternating current windings is A +, B-, C +, A-, B + and C-, and the middle long stator hollow winding is fixed on the ground after being poured and molded by non-conductive magnetic materials.

4. The structure of the double-fed double-side linear motor with the long stator air-core winding according to claim 1, is characterized in that: the first rotor and the second rotor are parallel in position, and the tooth grooves are opposite.

5. The structure of the double-fed double-side linear motor with the long stator air-core winding according to claim 1, is characterized in that: the first rotor and the second rotor are both provided with double-layer lap winding in tooth grooves, the rotor windings of the double-layer lap winding are respectively composed of A, B, C three-phase alternating current windings, and the phase sequence is A +, B-, C +, A-, B + and C-.

6. The structure of the double-fed double-side linear motor with the long stator air-core winding according to claim 1, is characterized in that: the U-shaped connecting piece comprises a circular through hole for fixing the first rotor and the second rotor.

7. The long stator air core winding double-sided doubly-fed linear motor structure of claim 6, wherein: the U-shaped connecting piece is made of a non-conductive magnetic material, and the first rotor and the second rotor are fixed on the inner side of the U-shaped connecting piece through positioning screw holes in a U-shaped straight arm on the U-shaped connecting piece.

Technical Field

The invention belongs to the technical field of linear motors, and particularly relates to a long-stator hollow winding double-side double-fed linear motor structure.

Background

With the progress of science and technology, the linear driving technology is increasingly widely applied in the fields of transportation industry, precision manufacturing and the like. In a traditional numerical control machine tool system, linear transportation is usually realized by adopting a mode of a rotary servo motor and a transmission mechanism. Because the linear transportation needs the participation of intermediate power transmission mechanisms such as gears, belts, couplings, clutches and the like, the whole machine tool system is not easy to realize the stable control of a full closed loop. In addition, the driving mechanism is easy to damage, the mechanical noise is large, the efficiency is low and the like, so that the linear motor driving gradually replaces a mode of 'rotating servo motor + driving mechanism' to become a main force.

Generally, the linear motor is obtained by splitting and extending a rotating motor, and is widely applied to the fields of linear servo transmission, magnetic levitation transportation and the like. The double-fed linear motor has excellent speed regulation performance because the stator and the rotor of the double-fed linear motor are all connected with three-phase alternating current with adjustable amplitude, frequency and phase, and is increasingly emphasized by people. The common double-fed linear motor is formed by changing a linear induction motor, a secondary induction plate of the linear induction motor is replaced by an iron core and a winding which are consistent with a primary induction plate, three-phase alternating currents with different frequencies are introduced into two sides of the linear induction motor, and traction force is generated based on a magnetic field modulation principle. However, the normal force generated by the common double-fed linear motor in the actual operation process is dozens of or hundreds of times of the traction force, so that the common double-fed linear motor brings application difficulty in some linear servo transmission application scenes; for the application occasions of linear motors which require small normal force and can provide enough traction force, a bilateral linear induction motor or a bilateral permanent magnet synchronous motor is generally adopted. The double-sided linear induction motor is produced by combining two single-sided linear induction motor backrests, wherein primary iron cores and windings which are introduced with three-phase alternating current are arranged at two sides, and a secondary induction plate is arranged in the middle. The two sides of the induction plate are connected in a primary mode to form a U-shaped structure, the windings with three-phase alternating current introduced into the two sides of the induction plate generate traveling wave magnetic fields on the two sides of the induction plate to interact with the induction plate to form traction force, and the primary normal forces on the two sides are equal in magnitude and opposite in direction and offset mutually. However, the bilateral linear induction motor is not suitable for long-distance linear transportation, because the rotors, whether primary or secondary induction plates on both sides, need to consume a large number of iron cores or the laying of the induction plates, and the construction cost is high, which is not favorable for practical application. In addition, the speed regulation performance of the bilateral linear induction motor is poor. The bilateral permanent magnet synchronous motor has good speed regulation performance, and structurally, permanent magnets are alternately arranged to serve as secondary permanent magnets, and a magnetic field generated by the secondary permanent magnets and a traveling wave magnetic field generated by the primary permanent magnets interact to realize synchronous operation. However, the permanent magnet which needs a large amount of rare earth materials at the secondary level is high in cost and difficult to install and maintain in practical engineering application.

In conclusion, for the application occasions requiring long-distance laying, small normal force and flexible speed regulation, the common double-fed linear motor, the bilateral linear induction motor and the bilateral permanent magnet synchronous motor can not completely meet the requirements.

Disclosure of Invention

The present invention is directed to solve or improve the above-mentioned problems by providing a long-stator air-core winding double-fed linear motor structure.

In order to achieve the purpose, the invention adopts the technical scheme that:

a double-fed linear motor structure with a long stator hollow winding and double sides comprises a middle long stator hollow winding, a plurality of U-shaped connecting pieces, a first rotor and a second rotor, wherein the first rotor and the second rotor are positioned on two sides; the first rotor and the second rotor are respectively fastened at the inner sides of the plurality of U-shaped connecting pieces, the first rotor and the second rotor are symmetrical in structure and parallel in position, and both the first rotor and the second rotor comprise rotor cores and three-phase rotor windings wound on the rotor cores in an overlapping mode; the distance between the middle long stator air-core winding and the first rotors on the two sides is a first gap, the distance between the middle long stator air-core winding and the second rotors is a second gap, the width of the first gap is equal to that of the second gap, and the middle long stator air-core winding is fixed on the ground in a lap winding mode through a non-conductive magnetic material.

Further, the hollow core winding of the middle long stator comprises a three-phase alternating current winding and a non-conductive magnetic conducting material for winding shaping.

Furthermore, the hollow windings of the middle long stator are respectively composed of A, B, C three-phase alternating-current windings, the phase sequence of the three-phase alternating-current windings is A +, B-, C +, A-, B + and C-, and the hollow windings of the middle long stator are fixed on the ground after being cast and molded by non-conductive magnetic materials.

Furthermore, the first rotor and the second rotor are parallel in position, and the tooth grooves are opposite.

Furthermore, the tooth grooves of the first rotor and the second rotor are both provided with double-layer lap winding, the rotor windings of the double-layer lap winding are respectively composed of A, B, C three-phase alternating current windings, and the phase sequence is A +, B-, C +, A-, B + and C-.

Further, the U-shaped connector comprises a circular through hole for fixing the first mover and the second mover.

Furthermore, the U-shaped connecting piece is made of non-conductive magnetic materials, and the first rotor and the second rotor are fixed on the inner side of the U-shaped connecting piece through positioning screw holes in a U-shaped straight arm on the U-shaped connecting piece.

The double-side double-fed linear motor structure of the long stator hollow winding provided by the invention has the following beneficial effects:

the invention adopts the hollow winding as the long stator, effectively reduces the construction cost and is suitable for long-distance laying; in addition, because the stator does not have yoke iron core, the cogging effect influence is small, and the thrust ripple is small; the invention adopts a bilateral rotor structure, and the normal force directions borne by the rotor side are opposite and offset; the invention adopts a double-fed control scheme, the motor can run synchronously or asynchronously, and the speed adjustable range is large.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a long stator air-core winding double-side double-fed linear motor.

Fig. 2 is a structural schematic diagram of a long stator air-core winding double-side double-fed linear motor single-side rotor.

Fig. 3 is a structural schematic diagram of a long stator air-core winding double-side double-fed linear motor stator.

Fig. 4 is a structural schematic diagram of a long stator air-core winding double-side double-fed linear motor U-shaped connecting piece.

Fig. 5 is a schematic structural section view of a long stator air-core winding double-side double-fed linear motor.

Fig. 6 is a structural schematic diagram of a common doubly-fed linear motor.

Fig. 7 is a schematic diagram of traction force and normal force of a common doubly-fed linear motor.

Fig. 8 is a schematic diagram of traction force and normal force of a long stator air-core winding double-side double-fed linear motor.

The device comprises a first rotor and a second rotor, wherein 1 is a first rotor; 2. a second mover; 3. a U-shaped connector; 4. a middle long stator hollow winding; 11. a first gap; 12. a second gap; 21. a mover core; 22. a three-phase rotor winding; 31. a circular via hole; 41. a non-conductive magnetically permeable material shell; 42. and a three-phase alternating current winding.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.

According to an embodiment of the application, the double-fed linear motor structure with the long stator air-core winding and the double-sided double-fed linear motor comprises a middle long stator air-core winding 4, a plurality of U-shaped connectors 3, and a first rotor 1 and a second rotor 2 which are located on two sides, wherein the first rotor 1 and the second rotor 2 are respectively fastened on the inner sides of the U-shaped connectors 3.

Referring to fig. 1, a first mover 1 and a second mover 2 are symmetrical in structure and parallel in position such that two mover tooth slots are opposite, and the first mover 1 and the second mover 2 each include a mover core 21 and a three-phase mover winding 22 wound around the mover core 21, and the first mover 1 and the second mover 2 are made of the three-phase mover winding 22 wound around the mover core 21; the polar distances of the rotors and the stators on the two sides are equal.

The first mover 1 and the second mover 2 are combined together to form a double-sided mover, and the single first mover 1 or the single second mover 2 is a single-sided mover.

The bilateral rotor is provided with an iron core, the geometric parameters of the tooth socket structure are consistent, the bilateral rotor is placed in parallel on the position, and the tooth sockets are opposite; the single-side rotor, namely the first rotor 1 or the second rotor 2, is provided with double-layer lap winding in a groove, the rotor winding is respectively composed of A, B, C three-phase windings, and the phase sequence is A +, B-, C +, A-, B + and C-.

Referring to fig. 5, the distance between the long stator air-core winding 4 in the middle and the first mover 1 at both sides is a first gap 11, the distance between the long stator air-core winding 4 in the middle and the second mover 2 is a second gap 12, the width of the first gap 11 is equal to that of the second gap 12, and the long stator air-core winding 4 in the middle is fixed on the ground in a lap winding manner through a non-conductive magnetic material.

Referring to fig. 2, the first and second movers 1 and 2 structure includes a mover core 21 and a three-phase mover winding 22, and the first and second movers 1 and 2 are made of the three-phase mover winding 22 wound on the mover core 21.

Referring to fig. 3, the stator structure mainly includes a three-phase ac winding 42 and a non-conductive magnetic conductive material case 41 for fixing the winding.

The three-phase alternating current winding 42 adopts a lap winding form, a single-layer winding is arranged at the head and tail pole distance, and the rest are double-layer windings; and the non-conductive magnetic conductive material adopts a resin pouring mode to shape the three-phase winding, and finally the whole middle long stator air-core winding 4 is fixed on the ground.

The gaps between the middle long stator hollow winding 4 and the rotors on the two sides are equal, the middle long stator hollow winding 4 is respectively composed of A, B, C three-phase windings, the phase sequence is A +, B-, C +, A-, B + and C-, the whole is cast by non-conductive magnetic materials and then fixed on the ground.

Referring to fig. 4, the connecting member is U-shaped, two circular through holes 31 are respectively formed at the bottoms of the two straight arms, and the first mover 1 and the second mover 2 are respectively fixed at the inner sides of the U-shaped arms of the connecting member through the circular through holes 31.

According to the scheme, the fixed hollow-core winding is used as the long stator, and double iron cores are used on the double-side rotor structure to form a novel double-side double-fed linear motor with the long-stator hollow-core winding. Compared with a linear induction motor, the long-stator bilateral doubly-fed linear motor has the advantages that the normal force can be greatly reduced under the condition that the traction force is ensured to be consistent, so that other measures are not needed in practical application to avoid the influence of the normal force; compared with a bilateral linear induction motor, the long-stator bilateral double-fed linear motor has the advantages that the long stator adopts the hollow winding, so that the consumption of ferromagnetic materials is greatly reduced, the engineering cost of practical application is reduced, and the long-distance laying is facilitated.

To sum up, bilateral iron core, the trilateral winding structure of the bilateral double-fed linear motor of long stator for motor traction can reach the linear induction motor level of bilateral iron core, and normal force approaches to zero, and compares trilateral iron core structure cost lower, compares that both sides winding structure control is more nimble.

Meanwhile, the invention adopts the hollow winding as the long stator, effectively reduces the construction cost and is suitable for long-distance laying; in addition, because the stator does not have yoke iron core, the cogging effect influence is small, and the thrust ripple is small; the invention adopts a bilateral rotor structure, and the normal force directions borne by the rotor side are opposite and offset; the invention adopts a double-fed control scheme, the motor can run synchronously or asynchronously, and the speed adjustable range is large.

According to another embodiment of the present application, referring to fig. 6, the number of pole pairs of the mover is 4, the tooth width of the mover is 10mm, the slot width of the mover is 24mm, the slot depth of the mover is 22mm, the number of slots per pole and per phase of the mover is 3, the pole pitch of the mover is 306mm, the current amplitude of the winding at the side of the mover is 320A, the frequency is 15Hz, and the number of turns of the winding coil of the mover is 2; the number of slots of each phase of each pole of the stator is 4, the current amplitude of a winding on the side of the stator is 450A, the frequency is 50Hz, the number of turns of a winding coil is 2 turns, the running speed is 21.42m/s, the electromagnetic force simulation result is shown in FIG. 7, the traction force is about 4.82kN, and the normal force is 28.3 kN.

In the implementation, the number of pole pairs of the rotor is 4, the tooth width of the rotor is 10mm, the slot width of the rotor is 24mm, the slot depth of the rotor is 22mm, the number of slots of each pole of the rotor is 3, the pole pitch of the rotor is 306mm, the current amplitude of a winding on the side of the rotor is 320A, the frequency is 15Hz, and the number of turns of a winding coil of the rotor is 2; the number of slots of each phase of each pole of the stator is 4, the current amplitude of a winding on the stator side is 450A, the frequency is 50Hz, the number of turns of a winding coil is 2 turns, the running speed is 21.42m/s, the electromagnetic force data is shown in figure 8, the traction force is about 4.97kN, and the normal force is 291.7N.

In conclusion, the bilateral double-fed linear motor designed by the scheme has the advantages that under the same design parameters, compared with a common double-fed linear motor, the normal force is greatly reduced when the traction force is ensured to be consistent, and the adverse effect of the normal force on practical application is effectively avoided; compared with a bilateral induction motor or a bilateral synchronous motor, the bilateral doubly-fed linear motor has the advantages that the consumption of ferromagnetic materials on the long stator side is greatly saved, the construction cost is reduced, and the practical application of engineering is facilitated.

While the embodiments of the invention have been described in detail in connection with the accompanying drawings, it is not intended to limit the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.