CN112366839B

CN112366839B - Stator and motor

Info

Publication number: CN112366839B
Application number: CN202011003862.1A
Authority: CN
Inventors: 张继胤; 江胜军; 张强; 龙芳; 李尚平
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2022-05-13
Anticipated expiration: 2040-09-22
Also published as: CN112366839A

Abstract

The invention relates to a stator which comprises stator slots, wherein at least two magnetism isolating cavities are arranged between two adjacent stator slots, and the magnetism isolating cavities axially penetrate through two end faces of the stator. The invention also relates to an electric machine provided with a stator as described above.

Description

Stator and motor

Technical Field

The invention relates to the field of motors, in particular to a stator and a motor using the stator.

Background

In the existing motor industry, motors of stator excitation structures all generate a positive rotating wave magnetic field, excitation windings are distributed according to the requirement of generating the positive rotating wave magnetic field, so that the excitation magnetic field forms a magnetic field waveform approximately distributed along the surface of a magnetic pole in a positive rotating mode, when excitation current is conducted to the excitation windings, a magnetic field is generated on the surface of the magnetic pole surrounded by the windings, namely magnetic lines of force pass through, the magnetic lines of force generated by the windings are transmitted in the motors through a stator iron core and a rotor iron core, but not all the magnetic lines of force can be transmitted according to a preset route, a small-range closed loop is formed around the excitation magnetic field by part of the magnetic lines of force, some harmonic waves are generated, and the harmonic waves have certain interference on sine waves generated by the main magnetic field of the motors, so that the effective power of the motors can be influenced, and the efficiency of the motors is reduced.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a stator with a novel structure and a motor using the stator.

In order to achieve the purpose, the invention adopts the following technical scheme: compared with the stator with the prior structure, the stator provided by the application is structurally improved in that: at least two magnetism isolating cavities are additionally arranged between two adjacent stator slots. This application can reduce the production of magnetic leakage flux through add the magnetic isolation chamber in stator structure, reduces the interference of harmonic to main flux to increase effective magnetic flux, improve the efficiency of motor, reduce the vibration noise that the harmonic produced. The magnetism isolating cavity axially penetrates through two end faces of the stator on the stator.

In one embodiment, the magnetic isolation cavity structure is arranged between two adjacent stator slots and close to the excitation winding, and magnetic isolation cavities are arranged on two sides of a magnetic pole center line of the two adjacent stator slots, so that the generation of leakage magnetic flux is hindered.

In one embodiment, the magnetic isolation cavity structure is arranged between two adjacent stator slots and close to the excitation winding, and the magnetic isolation cavity is arranged along the magnetic pole center lines of the two adjacent stator slots, so that the generation of leakage magnetic flux is hindered.

In one embodiment, the magnetic isolation cavity is communicated with the stator slot close to the magnetic isolation cavity to form a through slot, which is equivalent to form larger magnetic resistance and hinders the formation of leakage magnetic lines.

In one embodiment, the magnetism isolating cavity is not communicated with the stator slot close to the magnetism isolating cavity, so that the high requirement on the mechanical strength of the motor caused by the overlarge reluctance torque of the motor is prevented.

In one embodiment, the number of the magnetism isolating cavities is two, and the two magnetism isolating cavities are symmetrically arranged along the center line of two adjacent stator slots.

The application provides a stator sets up a plurality of magnetism chambeies that separate on adjacent two stator slots, and the shape and the size of each magnetism chambeies that separate between adjacent two stator slots can be the same, also can not be the same. The number of the magnetism isolating cavities positioned between different stator slots can be the same or different.

In the present application, the overall area of the magnetic isolation chamber is smaller than the area of the stator slot. The magnetic isolation cavity is too small in area, so that the magnetic isolation effect of the motor is poor; the area of the magnetism isolating cavity is too large, the areas of the stator slots and the stator teeth can be correspondingly reduced, the area of the stator teeth is too small, the magnetic density of the stator can be too high, the temperature rise of the motor is increased, the area of the stator slots is too small, the excitation magnetic flux of the stator can be reduced, and the efficiency of the motor is reduced. Therefore, the total area of the magnetism isolating cavities needs to be controlled within a certain range, in the application, the total area of the magnetism isolating cavities is set to be S1, the total area of the stator slots is set to be S2, and the condition that S1/S2 is more than or equal to 0.1 and less than or equal to 0.2 is met.

The magnetic isolation cavity is arranged between two adjacent stator slots, the height of the magnetic isolation cavity is not more than that of the bottom of the stator slot, in the application, the diameter of the bottom circle of the stator slot is set to be d1, the diameter of the inner circle of the stator is set to be d2, the height of the magnetic isolation cavity is set to be d, and d2/2 is not less than d 1/2. The magnetic isolation cavity is arranged between the inner circle of the stator and the bottom circle of the groove, if the height of the magnetic isolation cavity exceeds the diameter of the inner circle of the stator, the magnetic isolation cavity becomes an open groove, the open groove cannot play a role of the magnetic isolation cavity in the application, and the wind mill loss of the motor can be increased by additionally arranging the open groove on the stator; if the height of the magnetism isolating cavity exceeds the diameter of the bottom circle, the magnetic density of the stator yoke part is increased.

The number of the magnetism isolating cavities is determined according to the number of the stator slots, in the application, the number of the stator slots is set to be N, the number of the magnetism isolating cavities is set to be N1, N1 and 2N are met, and the design is designed according to requirements

In one embodiment, the stator is provided with a circular magnetism isolating cavity, an oval magnetism isolating cavity shape and a rectangular magnetism isolating cavity.

For the stator among the prior art, the stator of the novel structure that provides in this application has following technological effect:

1. by additionally arranging the magnetic isolation cavity structure on the stator, the generation of leakage magnetic flux can be reduced, and the interference of harmonic waves to main magnetic flux is reduced, so that the effective magnetic flux is increased, the efficiency of the motor is improved, and the vibration noise generated by the harmonic waves is reduced;

2. through add on the stator and separate magnetic cavity structure, can block the magnetic leakage magnetic circuit, reduce the motor magnetic leakage, improve the effective magnetic flux of motor to improve motor efficiency, reduce the harmonic that the magnetic leakage can restrain the magnetic leakage and produce, reduced the electromagnetic noise of motor, simultaneously, increase and separate the magnetic cavity, also increased the cocurrent area of stator, help the heat dissipation to the motor at the operation in-process.

The invention also provides a motor, which uses the stator.

In an embodiment, use the stator that is provided with magnetism isolating cavity structure on PMSM, can block the magnetic leakage magnetic circuit, reduce the motor magnetic leakage, improve the effective magnetic flux of motor to improve motor efficiency, reduce the harmonic that the magnetic leakage can restrain the magnetic leakage and produce, reduced the electromagnetic noise of motor, simultaneously, increase magnetism isolating cavity, also increased the cocurrent area of stator, help the heat dissipation to the motor at the operation in-process.

Drawings

The figures further illustrate the invention, but the examples in the figures do not constitute any limitation of the invention.

Fig. 1 is a schematic structural diagram of a stator provided in embodiment 1 of the present invention.

Fig. 2 is a front view of a stator provided in embodiment 1 of the present invention.

Fig. 3 is a front view of a stator provided in embodiment 2 of the present invention.

Fig. 4 is a front view of a stator provided in embodiment 3 of the present invention.

Wherein, the reference numbers in the specification are as follows: 1. a stator; 2. a stator slot; 3. and a magnetism isolating cavity.

Detailed Description

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 the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, directly coupled, or indirectly coupled through intervening agents, both internally and/or in any other manner known to those skilled in the art. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

Example 1

As shown in fig. 1-2, the present embodiment provides a stator 1, which stator 1 is provided with two magnetic isolation chambers 3 between adjacent two stator slots 2. The magnetic isolation chamber 3 axially penetrates both end faces of the stator 1 on the stator 1. The magnetism isolating cavity 3 is arranged between two adjacent stator slots 2 and close to the excitation winding, and two sides of the magnetic pole center line of the two adjacent stator slots 2 are distributed in the magnetism isolating cavity 3, so that the generation of leakage magnetic flux is hindered. The magnetism isolating cavity 3 is communicated with the stator slot 2 close to the magnetism isolating cavity to form a through slot, which is equivalent to form larger magnetic resistance and hinders the formation of magnetic lines of leakage flux.

In this embodiment, the structures of the magnetism isolating cavities 3 on the stator 1 are all the same, and the cross sections of the magnetism isolating cavities 3 are rounded rectangles.

In the embodiment, the diameter of the bottom circle (marked as R1 in the drawing) of the stator slot is set as d1, the diameter of the inner circle (marked as R2 in the drawing) of the stator is set as d2, the height of the magnetism isolating cavity 3 is set as d, and d is larger than or equal to d2/2 and smaller than or equal to d 1/2.

Example 2

As shown in fig. 3, the present embodiment provides a stator 1, and the stator 1 is provided with two magnetic isolation chambers 3 between two adjacent stator slots 2. The magnetic isolation chamber 3 axially penetrates both end faces of the stator 1 on the stator 1. The magnetism isolating cavity 3 is arranged between two adjacent stator slots 2 and close to the excitation winding, and two sides of the magnetic pole center line of the two adjacent stator slots 2 are distributed in the magnetism isolating cavity 3, so that the generation of leakage magnetic flux is hindered. The magnetism isolating cavity 3 is not communicated with the stator slot 2 close to the magnetism isolating cavity, so that the high requirement on the mechanical strength of the motor caused by the overlarge reluctance torque of the motor is prevented.

In this embodiment, the structures of the magnetic isolation cavities 3 on the stator 1 are all the same, and the cross sections of the magnetic isolation cavities 3 are rectangular.

Example 3

As shown in fig. 4, the present embodiment provides a stator 1, and the stator 1 is provided with two magnetic isolation chambers 3 between two adjacent stator slots 2. The magnetic isolation chamber 3 axially penetrates both end surfaces of the stator 1 on the stator 1. Two magnetic isolation cavities 3 are arranged between two adjacent stator slots 2, close to the excitation winding. The cross sections of the two magnetism isolating cavities 3 are elliptical, but the widths of the two magnetism isolating cavities 3 are different. Two magnetic isolation cavities 3 are arranged along the magnetic pole center lines of two adjacent stator slots 2, thereby preventing the generation of leakage magnetic flux. The two magnetism isolating cavities 3 are not communicated with the stator slots 2, so that the high requirement on the mechanical strength of the motor caused by overlarge reluctance torque of the motor is prevented.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A stator comprises stator slots and is characterized in that at least two magnetism isolating cavities are arranged between two adjacent stator slots, the magnetism isolating cavities axially penetrate through two end faces of the stator, and the magnetism isolating cavities are communicated with the stator slots close to the magnetism isolating cavities to form through slots; the stator has wide stator teeth, narrow stator teeth and a raised strip extending radially from a stator yoke, the wide stator teeth and the narrow stator teeth forming the stator slots therebetween, the raised strip being disposed in the stator slots, and the raised strip and the narrow stator teeth forming the magnetic isolation cavity therebetween.

2. The stator according to claim 1, wherein the magnetic isolation chambers are disposed on both sides of a pole center line of two adjacent stator slots.

3. The stator as claimed in claim 1, wherein the magnetic isolation chamber is disposed along a pole center line of two adjacent stator slots.

4. The stator as claimed in any one of claims 1-3, wherein the total area of the inner wall surfaces of the magnetic isolation chamber is S1, and the total area of the inner wall surfaces of the stator slots is S2, satisfying 0.1 ≦ S1/S2 ≦ 0.2.

5. The stator as claimed in claim 4, wherein the number of the stator slots is N, the number of the magnetic isolation cavities is N1, and N1N 2N is satisfied.

6. The stator of claim 5, wherein the diameter of the bottom circle of the stator is d1, the diameter of the inner circle of the stator is d2, the diameter of the magnetism isolating cavity from the bottom circle of the stator to the inner circle of the stator is d, and d2/2 is larger than or equal to d 1/2.

7. The stator according to claim 6, wherein the number of the magnetic isolation cavities arranged between two adjacent stator slots is two.

8. An electrical machine, characterized in that a stator according to claim 1 is provided.