阅读说明：本技术 一种定子永磁型动铁芯式直线振荡电机 (Stator permanent magnet type moving iron core type linear oscillation motor ) 是由 徐伟 张祎舒 岳非弘 张娅平 黄诚 于 2020-12-10 设计创作，主要内容包括：本发明公开了一种定子永磁型动铁芯式直线振荡电机,属于直线振荡电机领域,包括：定子铁芯、永磁体、电枢绕组和动子铁芯；定子铁芯包括对称分布在动子铁芯运动平面两侧的两个定子铁芯模块,定子铁芯模块包括定子轭部和多个不等间距分布在定子轭部上的定子齿,中间两个定子齿之间的凹槽中设置有永磁体；电枢绕组包括两个线圈,该两个线圈分别缠绕在两个定子铁芯模块的中间两个定子齿上；动子铁芯包括动子轭部和多个等间距分布在动子轭部上的动子齿,使得当电枢绕组中通入正弦交流电时感应产生类正弦反电势,以在动子铁芯中产生振荡推力。该直线振荡电机兼具鲁棒性强和散热方便的优势,其双极性磁链提高了永磁体利用率和输出功率密度。(The invention discloses a stator permanent magnet type moving iron core type linear oscillating motor, belonging to the field of linear oscillating motors and comprising: the stator comprises a stator iron core, a permanent magnet, an armature winding and a rotor iron core; the stator core comprises two stator core modules which are symmetrically distributed on two sides of a moving plane of the rotor core, each stator core module comprises a stator yoke part and a plurality of stator teeth which are distributed on the stator yoke part at unequal intervals, and a permanent magnet is arranged in a groove between the two middle stator teeth; the armature winding comprises two coils which are respectively wound on the two middle stator teeth of the two stator core modules; the rotor iron core comprises a rotor yoke part and a plurality of rotor teeth which are distributed on the rotor yoke part at equal intervals, so that sine-like counter electromotive force is induced when sine alternating current is introduced into the armature winding, and oscillatory thrust is generated in the rotor iron core. The linear oscillating motor has the advantages of strong robustness and convenience in heat dissipation, and the bipolar flux linkage of the linear oscillating motor improves the utilization rate of the permanent magnet and the output power density.)

1. A stator permanent magnet type moving core linear oscillation motor is characterized by comprising: the stator comprises a stator iron core (6), a permanent magnet (7), an armature winding (8) and a rotor iron core (9);

the stator core (6) comprises two stator core modules which are symmetrically distributed on two sides of a motion plane of the rotor core (9), each stator core module comprises a stator yoke part and a plurality of stator teeth which are distributed on the stator yoke part at unequal intervals, and the permanent magnet (7) is arranged in a groove between the two middle stator teeth;

the armature winding (8) comprises two coils which are respectively wound on the two middle stator teeth of the two stator core modules;

the rotor iron core (9) comprises a rotor yoke part and a plurality of rotor teeth which are distributed on the rotor yoke part at equal intervals, so that sine-like counter electromotive force is induced when sine alternating current is introduced into the armature winding (8) to generate oscillating thrust in the rotor iron core (9).

2. The stator permanent magnet type moving core linear oscillation motor as claimed in claim 1, wherein the number of stator teeth and the number of mover teeth in each of said stator core modules are 4, the tooth widths of the respective stator teeth are equal, and the tooth widths of the respective mover teeth are equal.

3. The stator permanent magnet type moving core linear oscillation motor as claimed in claim 2, wherein a distance W between two middle stator teeth of said stator core module_si2And the distance W between two adjacent rotor teeth_riRespectively as follows:

W_si2＝W_pm+W_s

wherein, W_pmThe width of a permanent magnet (7) arranged in the stator core module; w_sIs the tooth width of the stator teeth; w_si1The distance between two stator teeth on two sides of the stator core module is shown.

4. The stator permanent magnet type moving core linear oscillation motor as claimed in claim 1, wherein two middle stator teeth of said stator core module are connected by a magnetic isolation bridge.

5. The stator permanent magnet type moving core linear oscillation motor according to claim 1, wherein the permanent magnets (7) provided in the two stator core modules are magnetized in the same direction as each other in a horizontal direction, and the two coils are connected in series or in parallel in an opposite direction.

6. The stator permanent magnet type moving iron core linear oscillation motor according to claim 1, wherein the permanent magnets (7) provided in the two stator iron core modules are magnetized in horizontal directions and in opposite directions, and the two coils are connected in series in the same direction or in parallel in the same direction.

7. The stator permanent magnet type moving core linear oscillation motor according to claim 1, further comprising an end cap (1), a casing (2), a linear motion bearing (3), a motion shaft (4) and a resonance spring (5), said end cap (1) comprising two parts disposed at both sides of said casing (2);

the number of the motion shafts (4) and the number of the resonance springs (5) are two, and the motion shafts and the resonance springs are distributed on two sides of the rotor iron core (9) along the motion direction of the rotor iron core (9);

one end of the motion shaft (4) is connected with the rotor core (9) along the motion direction of the rotor core (9), and the other end of the motion shaft (4) is connected with the end cover (1) through the linear motion bearing (3); the resonant spring (5) is sleeved on the outer side of the moving shaft (4) and is positioned between the rotor iron core (9) and the end cover (1); and the rotor iron core (9), the moving shaft (4) and the resonant spring (5) perform oscillating motion under the action of the oscillating thrust.

8. The stator permanent magnet type moving core linear oscillation motor according to claim 7, wherein the resonant spring (5) is a cylindrical spring which is in a compressed state and a compressed length is longer than a stroke of the linear oscillation motor.

9. The stator permanent magnet type moving core linear oscillation motor as claimed in claim 7, wherein said end cap (1) is provided with a fixing key, and an inner side surface of said housing (2) is provided with a fixing groove for fixing said stator core (6).

10. The stator permanent magnet type moving core linear oscillation motor as claimed in any one of claims 1 to 9, wherein said permanent magnet (7) is made of a rare earth permanent magnet material or ferrite; the stator iron core (6) and the rotor iron core (9) are formed by laminating non-oriented silicon steel sheets.

Technical Field

The invention belongs to the field of linear oscillating motors, and particularly relates to a stator permanent magnet type moving iron core linear oscillating motor.

Background

The traditional linear reciprocating motion is realized by adopting transmission mechanical structures such as a rotating motor, a crank connecting rod and the like. The non-direct-drive structure has the advantages of low efficiency, complex structure, poor reliability and large volume, and is subject to scaling in the industry. The permanent magnet linear oscillation motor adopting the direct drive structure removes transmission structures such as a crank connecting rod and the like, and adopts a high-performance rare earth permanent magnet material, so that the system efficiency and the power density are greatly improved.

The permanent magnet linear oscillation motor comprises a rotor permanent magnet type linear oscillation motor and a stator permanent magnet type linear oscillation motor. The rotor permanent magnet type linear oscillating motor enables the permanent magnet with lower mechanical strength to participate in linear reciprocating motion, so that the stability of the system is reduced, the difficulty of the processing technology is increased, and particularly, the service life of the permanent magnet material is greatly reduced when the linear oscillating motor is in high-frequency oscillating motion. In addition, the permanent magnet is arranged in the rotor and is not directly contacted with the external environment, so that the eddy current loss generated by the permanent magnet under the action of an alternating armature magnetic field is difficult to rapidly dissipate, and the performance of the permanent magnet is irreversibly damaged when the permanent magnet works in a high-temperature environment for a long time.

Therefore, the stator permanent magnet type linear oscillation motor gets more attention, the moving part of the structure adopts the rotor core which is high in structural strength and easy to process, the robustness is strong, the permanent magnet is arranged in the stator core, the moving part is far away from the moving part and is directly contacted with the external environment, the protection capability of the permanent magnet on high-temperature magnetic loss and high-current magnetic loss is enhanced, and the robustness of the system is improved. However, the winding flux linkage of the stator permanent magnet type linear oscillation motor with the traditional structure is mostly a unipolar flux linkage, the characteristic reduces the utilization rate of the permanent magnet, and the improvement of the power density of the traditional stator permanent magnet type linear oscillation motor is limited.

Disclosure of Invention

Aiming at the defects and improvement requirements of the prior art, the invention provides a stator permanent magnet type moving iron core linear oscillation motor, and aims to improve the reliability of the motor structure, protect the permanent magnet part of the motor, generate a bipolar winding flux linkage and improve the power density of the motor by designing the stator and rotor structure of the motor.

To achieve the above object, according to one aspect of the present invention, there is provided a stator permanent magnet type moving core linear oscillation motor including: the stator comprises a stator iron core, a permanent magnet, an armature winding and a rotor iron core; the stator core comprises two stator core modules which are symmetrically distributed on two sides of the moving plane of the rotor core, each stator core module comprises a stator yoke part and a plurality of stator teeth which are distributed on the stator yoke part at unequal intervals, and the permanent magnet is arranged in a groove between the two middle stator teeth; the armature winding comprises two coils, and the two coils are respectively wound on the two middle stator teeth of the two stator core modules; the rotor iron core comprises a rotor yoke part and a plurality of rotor teeth which are distributed on the rotor yoke part at equal intervals, so that sine-like counter electromotive force is induced when sine alternating current is introduced into the armature winding, and oscillatory thrust is generated in the rotor iron core.

Furthermore, the number of the stator teeth and the number of the rotor teeth in each stator core module are both 4, the tooth widths of the stator teeth are equal, and the tooth widths of the rotor teeth are equal.

Furthermore, the distance W between two middle stator teeth of the stator core module_si2And the distance W between two adjacent rotor teeth_riRespectively as follows:

W_si2＝W_pm+W_s

wherein, W_pmThe width of the permanent magnet arranged in the stator core module; w_sIs the tooth width of the stator teeth; w_si1Is the statorThe distance between two stator teeth on two sides of the iron core module.

Furthermore, two stator teeth in the middle of the stator core module are connected through a magnetic isolation bridge.

Furthermore, the magnetizing directions of the permanent magnets arranged in the two stator core modules are both horizontal directions and the directions are the same, and the two coils are connected in series or in parallel in an opposite direction.

Furthermore, the magnetizing directions of the permanent magnets arranged in the two stator core modules are both horizontal directions and opposite, and the two coils are connected in series in the same direction or in parallel in the same direction.

Furthermore, the vibration damper further comprises an end cover, a machine shell, a linear motion bearing, a motion shaft and a resonant spring, wherein the end cover comprises two parts arranged on two sides of the machine shell; the number of the motion shafts and the number of the resonant springs are two, and the motion shafts and the resonant springs are distributed on two sides of the rotor core along the motion direction of the rotor core; one end of the motion shaft is connected with the rotor core along the motion direction of the rotor core, and the other end of the motion shaft is connected with the end cover through the linear motion bearing; the resonant spring is sleeved outside the moving shaft and positioned between the rotor iron core and the end cover; and the rotor iron core, the moving shaft and the resonant spring perform oscillating motion under the action of the oscillating thrust.

Furthermore, the resonance spring is a cylindrical spring, and the cylindrical spring is in a compressed state, and the compression length is greater than the stroke of the linear oscillation motor.

Furthermore, the end cover is provided with a fixing key, and the inner side surface of the casing is provided with a fixing groove so as to fix the stator core.

Furthermore, the permanent magnet is made of rare earth permanent magnet material or ferrite; the stator iron core and the rotor iron core are formed by laminating non-oriented silicon steel sheets.

Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:

(1) the stator tooth pitch is set to be unequal in pitch, the rotor tooth pitch is set to be equal in pitch, the magnetic path trend of the motor can be changed in the moving process of the motor by utilizing a magnetic flux switching principle, so that a bipolar flux linkage and a quasi-sinusoidal counter potential are generated in each coil of the armature winding, and then the bipolar flux linkage and the quasi-sinusoidal counter potential interact with sinusoidal alternating current with the same frequency introduced into the armature winding, so that oscillation thrust is generated in a rotor iron core, and the utilization rate of a permanent magnet and the output power density are improved; in addition, the stator core is integrally designed, so that the stator is easy to process;

(2) the tooth number and the tooth spacing of the stator core and the rotor core are specially designed, so that the permanent magnet utilization rate and the output power density of the motor are further improved;

(3) the two middle stator teeth of the stator core module are connected through the magnetic isolation bridge, and the magnetic leakage of the permanent magnet between the two middle stator teeth is reduced.

Drawings

Fig. 1 is a schematic longitudinal sectional view of a stator permanent magnet type moving-iron-core linear oscillation motor according to an embodiment of the present invention;

fig. 2 is a schematic three-dimensional structure diagram of a stator permanent magnet type moving iron core linear oscillation motor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a housing of a stator permanent magnet type moving iron core linear oscillation motor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an end cover in a stator permanent magnet type moving iron core linear oscillation motor according to an embodiment of the present invention;

fig. 5A to 5C are schematic structural diagrams of different rotor positions in the stator permanent magnet type moving iron core linear oscillation motor according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of the output thrust and the motion speed of the linear oscillating motor under stable operation according to an embodiment of the present invention;

fig. 7 is a schematic diagram of the output thrust and the movement speed of the linear oscillation motor under the stable operation in another embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

the structure comprises an end cover 1, a machine shell 2, a linear motion bearing 3, a motion shaft 4, a resonance spring 5, a stator core 6, a permanent magnet 7, an armature winding 8 and a rotor core 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the present application, the terms "first," "second," and the like (if any) in the description and the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Fig. 1 is a schematic longitudinal sectional structure view of a stator permanent magnet moving-iron core linear oscillation motor according to an embodiment of the present invention. Referring to fig. 1, a stator permanent magnet type moving core linear oscillation motor according to the present embodiment will be described in detail with reference to fig. 2 to 7.

The stator permanent magnet type moving iron core type linear oscillation motor comprises a stator iron core 6, a permanent magnet 7, an armature winding 8 and a rotor iron core 9. The stator core 6 comprises two stator core modules symmetrically distributed on two sides of the moving plane of the rotor core 9, and each stator core module comprises a stator yoke portion and a plurality of stator teeth distributed on the stator yoke portion at unequal intervals. The number of the permanent magnets 7 is two, and the two permanent magnets are respectively arranged in the grooves between the two stator teeth in the middle of the two stator core modules. The armature winding 8 includes two coils which are wound around the two middle stator teeth of the two stator core modules, respectively. The mover core 9 includes a mover yoke and a plurality of mover teeth equally spaced on the mover yoke, so that a sine-like counter potential is induced when a sinusoidal alternating current is introduced into the armature winding 8 to generate an oscillatory thrust in the mover core 9. In the embodiment, the tooth pitches of the stator are set to be unequal in pitch, the tooth pitches of the rotor are set to be equal in pitch, the magnetic path trend of the motor can be changed in the motion process of the motor by utilizing the magnetic flux switching principle, then the bipolar flux linkage and the similar sine counter electromotive force are generated in each coil of the armature winding, and then the bipolar flux linkage and the similar sine counter electromotive force interact with the sine alternating current with the same frequency introduced into the armature winding, so that the oscillating thrust is generated in the rotor core, and the utilization rate and the output power density of the permanent magnet are improved.

Each stator core module in the stator core 6 is a whole, the number of stator teeth in each stator core module is 4, and the tooth width of each stator tooth is equal. Two stator teeth that lie in the limit end both sides in the stator core module are connected with stator yoke portion, are located and connect through separating the magnetic bridge between two middle stator teeth to reduce stator core 6's the processing degree of difficulty, promoted motor stator structure's intensity. The magnetic isolation bridge can also reduce the magnetic leakage of the permanent magnet. The number of the rotor teeth in the rotor core 9 is 4, and the tooth widths of the rotor teeth are equal. The stator teeth are distributed on the stator yoke part at unequal intervals, and the rotor teeth are distributed on the rotor yoke part at equal intervals and symmetrically, so that magnetic flux switching in the motion process is realized.

According to the embodiment of the invention, the distance W between two middle stator teeth of the stator core module_si2And the distance W between two adjacent rotor teeth in the rotor core 9_riRespectively as follows:

W_si2＝W_pm+W_s

wherein, W_pmThe width of the permanent magnet 7 provided in the stator core module; w_sIs the tooth width of the stator teeth; w_si1The distance between two stator teeth on two sides of the stator core module.

The permanent magnet 7 is composed of two parts which are respectively positioned between two stator teeth in the middle of the two stator core modules, and the magnetizing directions of the two parts of permanent magnets are both horizontal directions. In an embodiment of the present invention, the magnetizing directions of the two permanent magnets are both horizontal and the same, and at this time, the two coils in the armature winding 8 are arranged in series or parallel in opposite directions. In an embodiment of the present invention, the magnetizing directions of the two permanent magnets are both horizontal and opposite, and at this time, the two coils in the armature winding 8 are set to be connected in series in the same direction or in parallel in the same direction.

According to the embodiment of the present invention, referring to fig. 1 and 2, the stator permanent magnet type moving core linear oscillation motor further includes an end cover 1, a housing 2, a linear motion bearing 3, a motion shaft 4, and a resonance spring 5. The whole structure of the formed motor is a flat plate type linear structure.

The end cap 1 comprises two parts arranged on both sides of the housing 2. The shape of the end cap 1 matches the shape of the opening of the housing 2, for example a rectangular end cap. The end cap 1 is provided with a fixing key as shown in fig. 4. The inner side surface of the cabinet 2 is provided with fixing grooves as shown in fig. 3. Two stator core modules are fixed through the fixed slot on casing 2 and the fixed key of processing on the end cover 1, and through the structure and the position parameter design of cooperating to fixed slot and fixed key, can realize stator core's accurate installation and reliably fixed.

The number of the motion shafts 4 and the number of the resonant springs 5 are two, and the motion shafts are distributed on two sides of the rotor iron core 9 along the motion direction of the rotor iron core 9, and the number of the linear motion bearings 3 is 2. Specifically, a group of moving shafts 4, resonant springs 5 and linear moving bearings 3 are taken as an example to illustrate the connection relationship, one end of each moving shaft 4 is connected with the rotor core 9 along the moving direction of the rotor core 9, the other end of each moving shaft 4 is connected with the end cover 1 through the linear moving bearing 3, and the resonant springs 5 are sleeved on the outer side of the moving shafts 4 and located between the rotor core 9 and the end cover 1. The moving shaft 4 is fixedly connected, for example, by welding or shrink fitting through fixing holes machined at both ends of the mover core 9. The integrally processed moving shaft 4 and the rotor core 9 are fixed through the linear moving bearing 3 fixed on the end cover 1, so that the positions of the moving shaft 4 and the rotor core 9 are prevented from shifting up and down, and the motor motion performance is prevented from being scratched or damaged by the moving shaft and the stator core.

In the embodiment of the invention, the resonant spring 5 is a cylindrical spring, and the cylindrical spring is in a compressed state, and the compression length is greater than the stroke of the linear oscillating motor. It is to be noted that the compression length of the resonant spring 5 is slightly larger than the line of the linear oscillation motorThe stroke is not too large, and in this embodiment, the compression length of the resonant spring 5 may be set according to a specific application scenario of the motor. The resonance spring 5 is sleeved on the motion shaft 4, is in a compressed state, is placed between the rotor iron core 9 and the end cover 1, plays a role in maintaining the linear reciprocating motion of the rotor iron core and the motion shaft, and the elastic coefficient k, the total mass m of the motion part and the system motion frequency f of the resonance spring 5 meet the requirements

In the moving process, single-phase sinusoidal alternating current with the frequency of f is introduced into the armature winding 8 to generate oscillating thrust with the changing frequency of f in the rotor iron core 9, so that the rotor iron core 9 is pushed to compress the resonant spring 5, linear reciprocating motion with the changing frequency of f is carried out according to the designed effective stroke of the system, and the oscillating thrust is output by connecting the moving shaft 4 with an external load.

In the stator permanent magnet type moving iron core linear oscillation motor, the end cover 1 and the casing 2 are made of non-magnetic metal materials, for example; the material of the moving shaft 4 is, for example, a non-magnetic high-strength alloy material such as stainless steel; the stator iron core 6 and the rotor iron core 9 are formed by laminating non-oriented silicon steel sheets; the permanent magnet 7 is made of permanent magnet materials such as rare earth permanent magnet materials or ferrite; the armature winding 8 should be selected as a plurality of parallel wound enamelled copper wires and insulation should be added between the armature winding 8 and the stator core 6. It should be noted that during processing, insulation between the stator core 6 and the rotor core 9, insulation between each conductor of the armature winding 8, and insulation between the armature winding 8 and the stator core 6 should be ensured.

Referring to fig. 5A-5C, schematic structural diagrams of three special positions during the moving process of the rotor core are respectively shown, which are a positive flux linkage maximum position (as shown in fig. 5A), a flux linkage 0 position (as shown in fig. 5B), and a negative flux linkage maximum position (as shown in fig. 5C). The permanent magnet 7 and the armature winding 8 always generate air gap magnetomotive force waves with the same movement direction and the same change frequency in an air gap, and the air gap magnetomotive force waves interact with each other to generate oscillating thrust on the rotor iron core.

In this embodiment, according to the motor structure shown in fig. 1, two structures are designed, in which the permanent magnet magnetizing directions are opposite (denoted as motor a) and the permanent magnet magnetizing directions are the same (denoted as motor B), and the motor parameters are, for example, parameters shown in table 1.

TABLE 1

Further, the stable motion performance of the two motors shown in table 1 was analyzed, and the analysis results are shown in fig. 6 and 7, respectively. Referring to fig. 6 and 7, it can be shown that the stator permanent magnet type moving iron core linear oscillation motor can output oscillating thrust under the condition of inputting sinusoidal single-phase alternating current, and the motor structure has the advantages of improving the overall system efficiency, being easy to dissipate heat, being easy to process and maintain, having a firm structure and improving the thrust output, and can be used in the occasions of bidirectional reciprocating linear motion such as a linear compressor.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.