WO2018072594A1

WO2018072594A1 - Method of designing stator lamination plate, stator lamination plate, stator iron core, and motor

Info

Publication number: WO2018072594A1
Application number: PCT/CN2017/102930
Authority: WO
Inventors: 张育州; 黄侠昌; 李峰岩; 呼文超; 杨文德; 邓文科; 郭春林; 魏正平
Original assignee: 珠海格力节能环保制冷技术研究中心有限公司
Priority date: 2016-10-21
Filing date: 2017-09-22
Publication date: 2018-04-26
Also published as: CN106329852A

Abstract

A method of designing a stator lamination plate, a stator lamination plate, a stator iron core, and a motor. The method of designing a stator lamination plate comprises: Step S001: determining a structural parameter of the stator lamination plate affecting a cogging torque; Step S002: determining, by performing a simulation experiment, a design value of the structural parameter in Step S001; and Step S003: designing, according to the design value obtained in Step S002, the stator lamination plate. The embodiment reduces a cogging torque of a motor.

Description

Design method of stator punching piece, stator punching piece, stator core and motor

Technical field

The invention relates to the field of electric machines, and more particularly to a method for designing a stator punch, a stator punch, a stator core and a motor.

Background technique

The cogging torque is an inherent property of a permanent magnet motor. It is a torque generated by a magnetic field generated by a permanent magnet and a tooth groove of a stator core in a circumferential direction in a state where the armature winding is not energized. It arises from the tangential force between the permanent magnet and the armature tooth, so that the rotor of the permanent magnet motor has a tendency to align with the stator in a certain direction, trying to position the rotor at certain positions, and thus the trend An oscillating torque produced.

The cogging torque causes the motor torque to fluctuate, generating vibration and noise, and the speed fluctuation occurs, so that the motor cannot run smoothly and affects the performance of the motor. At the same time, the motor produces undesired vibration and noise. Therefore, cogging torque is one of the most critical parameters of servo motor design, which directly affects the precise, accurate and fast characteristics of servo motor. The smaller the cogging torque, the more accurate the control, the more accurate the positional positioning and the faster the response speed. While servo motors are used in automation equipment such as machine tools, robots, and robots, this feature is highly demanded. Therefore, the development of low-cogging torque motors has become a key technical difficulty in the servo motor industry.

Summary of the invention

In view of the above, the present invention provides a design method of a stator punch capable of reducing cogging torque, a stator punch, a stator core, and a motor.

In a first aspect, a method of designing a stator punch is provided.

A stator punch design method for reducing cogging torque of a motor, the design method comprising:

Step S001, determining structural parameters of the stator punch that affect the cogging torque;

Step S002, determining the structural parameters obtained in step S001 through simulation simulation experiments Valuation

Step S003, designing a stator punch according to the design value obtained in step S002.

Preferably, the determining structural parameters of the stator punch that affect the cogging torque of the motor further comprises:

When a structural parameter is selected, when the structural parameter is changed, and other structural parameters remain unchanged, if the variation of the motor cogging torque is higher than the preset variation, it is determined that the structural parameter is the cogging torque of the motor. Structural parameters.

Preferably, the design value of the structural parameter obtained in step S001 is determined by a simulation experiment to further include:

In the simulation experiment, one of the structural parameters determined in step S001 is selected, the value of the structural parameter is changed, and other structural parameters are maintained, and the cogging torque corresponding to the different values of the structural parameter is obtained, and the minimum cogging is turned The value corresponding to the moment is determined as the design value of the structural parameter.

In a second aspect, a stator punch is provided.

A stator punch designed according to the above described design method, the ratio of the yoke width to the tooth width of the stator punch is 0.5 to 0.7, and/or the pitch angle of the stator punch is 115 ° to 125°.

Preferably, the ratio of the inner circle radius to the outer circle radius of the stator punch is 0.5 to 0.55.

Preferably, the stator punch has a notch width of 0.15 to 1.3 mm.

Preferably, the slot of the stator punch has a dimension in the radial direction of 0.3 to 0.5 mm.

In a third aspect, a stator core is provided.

A stator core formed by stacking a plurality of stator punches as described above in the axial direction.

Preferably, the stator punch is formed by splicing a plurality of punching pieces in a circumferential direction.

In a fourth aspect, an electric machine is provided.

An electric machine comprising a stator core as described above.

The design method of the stator punching piece provided by the invention first determines the structural parameters of the stator punching piece which affect the cogging torque, and then determines the design value of the structural parameters according to the simulation experiment, thereby optimizing the structure of the stator punching piece and reducing the structure. Motor cogging torque effect, and design The method is simple and easy to implement.

The stator punching piece provided by the invention is designed by the above design method, can effectively reduce the cogging torque of the motor, thereby greatly improving the motor control precision, response speed and positioning accuracy of the motor.

The stator core provided by the invention is formed by stacking the above-mentioned stator punching sheets, which can effectively reduce the cogging torque of the motor, thereby greatly improving the motor control precision, response speed and positioning accuracy of the motor.

The motor provided by the invention can effectively reduce the cogging torque of the motor by using the above-mentioned stator core, and greatly improve the control precision, the response speed and the positioning accuracy.

DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from

1 is a schematic structural view of a stator punch provided by an embodiment of the present invention;

2 is a schematic diagram showing the structural parameters of the stator punching sheet provided by the embodiment of the present invention;

Figure 3 is a partial enlarged view of a portion A of Figure 2.

In the figure, 1, the tooth portion; 11, the tooth boot; 2, the yoke; 3, the punching unit.

detailed description

The invention is described below based on the examples, but the invention is not limited to only these examples. In the following detailed description of the invention, some specific details are described in detail. The invention may be fully understood by those skilled in the art without a description of these details. In order to avoid obscuring the essence of the present invention, well-known methods, procedures, procedures, and components are not described in detail.

In addition, the drawings are provided for the purpose of illustration, and the drawings are not necessarily to scale.

Unless explicitly required by the context, the words "including", "comprising", and the like in the claims and the claims should be interpreted as meanings of meaning rather than exclusive or exhaustive meaning; that is, "including but not limited to" The meaning.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specified.

The invention provides a design method of a stator punching piece and a stator punching piece and a stator core designed by the method, which can effectively reduce the cogging torque of the motor.

The design method includes:

Step S002, determining a design value of the structural parameter obtained in step S001 through a simulation experiment;

Specifically, to design the stator blank to reduce the cogging torque, it is first necessary to determine which structural parameters of the stator punch that can affect the cogging torque. As shown in FIG. 2 and FIG. 3, the structural parameters of the stator punch include a yoke width d2, a tooth width d1, a yoke width and a tooth width ratio v1, a tooth length d3, a tooth guard angle θ, and an inner circle. The radius r, the radius R of the outer circle, the ratio v2 of the radius of the inner circle to the radius of the outer circle, the width d4 of the notch, and the dimension d5 of the notch in the radial direction of the stator punch and the like.

In step S001, determining the structural parameters of the stator punch that affect the cogging torque is specifically: selecting a structural parameter, when the structural parameter is changed, and other structural parameters remain unchanged, if the motor cogging torque changes If the quantity is higher than the preset change amount, it is determined that the structural parameter is a structural parameter that affects the cogging torque of the motor, that is, when the change of the structural parameter can cause a large change of cogging torque, it is determined to affect the motor tooth. The structural parameters of the groove torque, if the change of the cogging torque is small when the structural parameter changes, that is, the influence of the structural parameter on the cogging torque is small, it is considered that it is not a structural parameter affecting the cogging torque of the motor. .

Here, the influence on the cogging torque is relatively small, and the preset variation can be set according to the application environment of the stator punch. When the design precision of the stator punch is high, the application scenario of the motor is When the performance requirement is high, the preset variation can be set smaller, and the structural parameters affecting the cogging torque of the motor are determined to be more, thereby meeting the design requirements. Conversely, when the design accuracy of the stator punch is lower, When the application scenario of the motor has lower performance requirements, the preset variation can be set larger, and the determined structural parameters affecting the motor cogging torque are correspondingly less.

For example, in one embodiment, determining the ratio v1 of the yoke width to the tooth width is a structural parameter that affects the cogging torque of the motor; in another embodiment, determining the pitch angle θ is the cogging torque that affects the motor. Structural parameters; in still another embodiment, determining the ratio v1 of the yoke width to the tooth width and the tooth angle θ are structural parameters that affect the cogging torque of the motor; in yet another embodiment, determining the yoke width and the teeth The ratio v1 of the width of the portion, the angle θ of the toothed shoe, the ratio v2 of the radius of the inner circle to the radius of the outer circle, the width d4 of the notch, and the dimension d5 of the notch in the radial direction of the stator punch are structural parameters affecting the cogging torque of the motor. Wherein, the yoke width refers to the dimension of the yoke portion 2 in the radial direction, and the tooth width is the dimension of the tooth portion 1 in the direction perpendicular to the axis of symmetry of the axis thereof, and the tooth shoe angle is between the toothed shoe 11 and the tooth portion 1 The angle, the notch refers to the gap formed between the adjacent two toothed shoes 11.

Further, the design value of the structural parameter obtained in step S001 is determined by the simulation experiment in step S002. Specifically, in the simulation experiment, one of the structural parameters determined in step S001 is selected, and the value of the structural parameter is changed and maintained. For other structural parameters, the cogging torque corresponding to the different values of the structural parameter is obtained, and the value corresponding to the minimum cogging torque is determined as the design value of the structural parameter.

In a specific embodiment, the structural parameter affecting the cogging torque of the motor determined in step S001 is to determine the ratio v1 of the yoke width to the tooth width and the tooth angle θ, and then in the simulation experiment, the first selection is performed. The ratio v1 of the yoke width to the width of the tooth portion changes the ratio v1 and keeps the tooth angle θ constant. The results obtained are as follows:

As can be seen from the above table, the minimum cogging torque can be obtained when the ratio v1 of the yoke width to the tooth width is 0.6, so the design value of the ratio v1 of the yoke width to the tooth width is determined to be 0.6.

Then, the tooth shoe angle θ is selected, the tooth shoe angle θ is changed, and the ratio v1 of the yoke width to the tooth width is kept constant, and the obtained results are as follows:

As can be seen from the above table, the minimum cogging torque can be obtained when the tooth angle θ is 120°, so the design value of the tooth angle θ is determined to be 120°.

Further, the stator punching piece is designed according to the design value obtained in step S002 in step S003, specifically, the structural parameter affecting the cogging torque of the stator punching piece is set to the design value obtained in step S002, and other structural parameters are according to the conventional numerical value. The setting can be, for example, first determine the size of the tooth width d1, the size of d1 needs to meet the rated operation of the motor and the triple overload operation, the magnetic density design value of the tooth needs to be reasonable, and the magnetic design value of the tooth is too low, which will affect the iron core. The utilization rate, the tooth magnetic density design value is too high, the motor temperature rise and the overload capability cannot be satisfied. Preferably, the tooth width d1 is designed to be 6.4 mm, and then the yoke is determined according to the ratio of the yoke width to the tooth width 0.6. The width d2 is 3.84 mm. It can be understood that due to the influence of processing precision, processing convenience, etc., the structural parameters of the stator punch do not have to be exactly the same as the design values obtained in step S002, as long as the performance requirements are satisfied within a certain range. Yes, the production cost and motor performance are balanced. For example, in a specific embodiment, the ratio v1 of the yoke width to the tooth width is set to 0.5 to 0.7, and the tooth angle θ is set to 115 to 125.

Further, the ratio of the inner circle radius to the outer circle radius v2 of the stator punching piece is 0.5 to 0.55, the notch width d4 is 0.15 to 1.3, and the dimension d5 of the notch in the radial direction of the stator punching piece can be determined as described above. It is 0.3 to 0.5, where the inner radius and the outer radius can be designed according to the motor speed and inertia demand.

In a further embodiment, the stator blank designed by the above method, as shown in FIG. 1, comprises a yoke 2, a tooth 1 and a toothed shoe 11. The ratio of the yoke width to the tooth width v1 is 0.5 to 0.7, the tooth angle θ is 115° to 125°, the ratio of the inner circle radius to the outer circle radius v2 is 0.5 to 0.55, and the notch width d4 is 0.15 to 1.3. Mm, the dimension d5 of the notch in its radial direction is 0.3 to 0.5 mm.

Further preferably, the ratio v1 of the yoke width to the tooth width is 0.6, and the tooth angle θ is 120°.

It can be understood that when the tooth portions 1 of the stator punch are not uniform in width in the radial direction, the minimum width or the average width thereof can be designed as the tooth width, and similarly, when the widths of the yoke portions 2 in the circumferential direction are not uniform, The minimum width or average width can be designed as the yoke width.

Further preferably, the stator punching piece is formed by splicing a plurality of punching sheets 3 in the circumferential direction, which further facilitates the processing of the stator core. The connection between the adjacent punching monomers 3 can be achieved by the cooperation of the positioning projections and the positioning grooves.

Further, a stator core is provided, which is formed by stacking a plurality of stator punches as described above in the axial direction to facilitate machining of the stator core.

Further, the present invention also provides a motor, which adopts the above-mentioned stator core, can effectively reduce the cogging torque of the motor, thereby greatly improving the control precision, response speed and positioning accuracy of the motor.

It will be readily understood by those skilled in the art that the above various preferred embodiments can be freely combined and superimposed without conflict.

The above-described embodiments are to be considered as illustrative and not restrictive. Modifications or substitutions are intended to be included within the scope of the appended claims.

Claims

A stator punch design method for reducing cogging torque of a motor, characterized in that the design method comprises:

Step S001, determining structural parameters of the stator punch that affect the cogging torque;

Step S002, determining a design value of the structural parameter obtained in step S001 through a simulation experiment;

Step S003, designing a stator punch according to the design value obtained in step S002.
The method of claim 1 wherein said determining a structural parameter of the stator die that affects the cogging torque of the motor further comprises:

When a structural parameter is selected, when the structural parameter is changed, and other structural parameters remain unchanged, if the variation of the motor cogging torque is higher than the preset variation, it is determined that the structural parameter is the cogging torque of the motor. Structural parameters.
The method according to claim 1, wherein the design value of the structural parameter obtained in step S001 is determined by a simulation experiment to further include:

In the simulation experiment, one of the structural parameters determined in step S001 is selected, the value of the structural parameter is changed, and other structural parameters are kept unchanged, and the cogging torque corresponding to the different values of the structural parameter is obtained, and the minimum tooth is obtained. The value corresponding to the slot torque is determined as the design value of the structural parameter.
A stator punch according to the design method according to any one of claims 1 to 3, characterized in that the ratio of the yoke width to the tooth width of the stator punch is 0.5 to 0.7, and/or The stator blade has a tooth angle of 115° to 125°.
The stator blank according to claim 4, wherein a ratio of a yoke width to a tooth width of the stator punch is 0.6, and/or a pitch angle of the stator punch is 120°.
The stator blank according to claim 4, wherein a ratio of an inner circle radius to an outer circle radius of the stator punch is 0.5 to 0.55.
The stator blank according to claim 4, wherein the stator punch has a notch width of 0.15 to 1.3 mm.
Stator blank according to claim 4, wherein said stator punch