CN109104004B

CN109104004B - Stator and motor with same

Info

Publication number: CN109104004B
Application number: CN201811117048.5A
Authority: CN
Inventors: 吴曼; 曹原; 周博; 徐培荣; 王晶
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2018-09-25
Filing date: 2018-09-25
Publication date: 2024-04-05
Anticipated expiration: 2038-09-25
Also published as: CN109104004A

Abstract

The invention relates to the field of motors, in particular to a stator and a motor with the same, wherein the stator is provided with a stator yoke, a plurality of stator teeth uniformly distributed along the circumferential direction of the stator, and stator grooves arranged between the stator teeth, and the notch of each stator groove faces to the axis of the stator; the stator teeth are provided with tooth body parts, two opposite side edges of the tooth body parts form an included angle theta towards the outer side of the stator on the radial section of the stator, and the included angle theta is more than 0 degrees and less than 10 degrees.

Description

Stator and motor with same

Technical Field

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

Background

At present, permanent magnet motors are widely applied, the performance requirements of people on the motors are higher and higher, the motor output is increased, the motor noise is reduced, the motor stator structure influences the trend of magnetic force lines of the motors, the torque pulsation of the existing motors is larger, and certain noise is generated in the operation process.

Disclosure of Invention

The invention aims to provide a rotor and a motor with the rotor, which can adjust the density of magnetic force lines, increase the output of the motor and reduce the zero-order six-frequency multiplication electromagnetic force of the motor.

Embodiments of the present invention are implemented as follows:

a stator, the stator has a stator yoke and a plurality of stator teeth uniformly distributed along the stator circumference, and stator slots arranged between the stator teeth, the slots of the stator slots are toward the axis of the stator;

the stator teeth are provided with tooth body parts, and on the radial section of the stator, two opposite side edges of the tooth body parts form an included angle theta towards the outer side of the stator, wherein the included angle theta is more than 0 degrees and less than 10 degrees.

Preferably, the above 0 DEG < theta <5 DEG, more preferably, 0 DEG < theta < 3 deg.

Preferably, the included angle between the side edge of the tooth body and the central line of the stator for equally dividing the tooth body is one half of the angle theta.

Preferably, the tooth width of the tooth body portion towards one end outside the stator is T5, the tooth width of the tooth body portion towards one end of the center of the stator is T3, and T3: t5> 0.6.

Preferably, the stator tooth has a tooth shoe, the tooth shoe is disposed on one side of the tooth body facing the center of the stator, and the tooth shoe includes two oblique sides respectively connected with the tooth body;

the included angle formed by the bevel edge and the side edge of the tooth body is alpha, 130 degrees less than alpha less than 150 degrees, and further, 135 degrees less than alpha less than 145 degrees

Preferably, the length of the stator teeth is T1, and the sum of the length of the stator teeth and the thickness of the stator yoke is T2;

the numerical ratio of T1 to T2 ranges from 0.5 to 0.9, further 0.75 < T1: t2 < 0.85

Preferably, the slot width of the stator slot is T4, and the length ratio of the T3 to the T4 ranges from 1.45 to 1.55.

Preferably, the tooth shoe includes a connecting portion connected to the tooth body portion and an extending portion connected to a side of the connecting portion facing the center of the stator; on the radial section of the stator, the connecting part is trapezoid, and the extending part is rectangular.

Preferably, the included angle formed by the bevel edge and the side edge of the tooth body is a round angle.

An electric machine comprising the stator described above.

The embodiment of the invention has the beneficial effects that:

the stator tooth comprises a tooth body part, the magnetic force line density is regulated by setting the relative included angles of two side edges of the tooth body part, the motor output is increased, the zero-order six-frequency multiplication electromagnetic force of the motor is reduced, and the motor noise is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a partial schematic view of FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a partial schematic view of FIG. 2 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a prior art magnetic field line structure;

fig. 5 is a schematic diagram of a magnetic force line structure according to an embodiment of the present invention;

FIG. 6 is a schematic diagram comparing an embodiment of the present invention with the prior art.

Icon: 1-a stator yoke; 2-stator teeth; 3-stator slots; 21-tooth body; 22-tooth shoe; 221-a connection; 222-extension.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1:

referring to fig. 1, 2, 3, 4, 5 and 6, the present embodiment provides a stator, which has a stator yoke 1, a plurality of stator teeth 2 uniformly distributed along the stator circumferential direction, and stator slots 3 spaced from the stator teeth 2, wherein the slots of the stator slots 3 face the axis of the stator;

the stator teeth 2 are provided with tooth body parts 21, and on the radial section of the stator, two opposite side edges of the tooth body parts 21 form an included angle theta towards the outer side of the stator, wherein the included angle theta is more than 0 degrees and less than 10 degrees.

The size of theta affects the density of magnetic force lines, when the value of theta is smaller, the capability of changing the magnetic force lines is weaker, and when the value of theta is too large, the stator slot 3 is relatively reduced, the copper loss of the motor is affected, and the motor efficiency is further affected; when theta is more than 0 DEG and less than 5 DEG, the magnetic force line density can be effectively regulated, the motor output is increased, the zero-order six-frequency multiplication electromagnetic force of the motor is reduced, and the motor noise is reduced.

The included angle degree between the side edge of the tooth body 21 and the central line of the stator equally dividing the tooth body 21 is one half of θ, the tooth width of one end of the tooth body 21 facing the outer side of the stator is T5, the tooth width of one end of the tooth body 21 facing the center of the stator is T3, and T3: t5>0.6, the stator tooth 2 is provided with a tooth shoe 22, the tooth shoe 22 is arranged on one side of the tooth body 21 facing the center of the stator, and the tooth shoe 22 comprises two bevel edges respectively connected with the tooth body 21; the included angle formed by the bevel edge and the side edge of the tooth body part 21 is alpha, 130 degrees < alpha <150 degrees;

the length of the stator teeth 2 is T1, and the sum of the length of the stator teeth 2 and the thickness of the stator yoke 1 is T2; the numerical ratio of T1 to T2 ranges from 0.5 to 0.9, the width of the notch of the stator groove 3 is T4, motor noise can be increased when the width of the notch of the stator groove 3 is too large, and when the length ratio of T3 to T4 ranges from 1.45 to 1.55, motor noise can be effectively reduced.

When the ratio of T1 to T2 is too small, the stator teeth 2 are smaller, so that the effect of changing magnetic force lines is not obvious; when the ratio of T1 to T2 is too large, the thickness of the stator yoke 1 becomes small, so that the iron loss of the motor is increased, 130 degrees < alpha <150 degrees are favorable for reducing the magnetic flux leakage of the motor, and the output of the motor is improved.

As shown in fig. 3, the tooth shoe 22 includes a connecting portion 221 and an extending portion 222, the connecting portion 221 is connected to the tooth body 21, the extending portion 222 is connected to a side of the connecting portion 221 facing the center of the stator, and the connecting portion 221 has a trapezoid shape and the extending portion 222 has a rectangular shape in a radial cross section of the stator.

The motor comprises the stator, a rotor of the motor is rotatably arranged inside the stator, when the motor rotates, the stator can effectively adjust the flux density, the motor output is increased, the motor torque pulsation and the stator slot 3 torque are reduced, and the zero-order six-time frequency electromagnetic force of the motor is reduced.

On the other hand, in the embodiment of the present invention described above, when 0 ° < θ <5 °,0.75 < T1: when T2 is less than 0.85 and 135 degrees is less than alpha is less than 145 degrees, the magnetic force line density can be effectively increased, the motor output is increased, the zero-order six-frequency multiplication electromagnetic force of the motor is reduced, and the motor noise is reduced.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The stator is characterized by comprising a stator yoke (1), a plurality of stator teeth (2) uniformly distributed along the circumferential direction of the stator, and stator slots (3) which are arranged at intervals with the stator teeth (2), wherein the notch of each stator slot (3) faces to the axis of the stator;

the stator teeth (2) are provided with tooth body parts (21), and on the radial section of the stator, two opposite side edges of the tooth body parts (21) form an included angle theta towards the outer side of the stator, wherein the included angle is 0 degrees < theta <10 degrees;

the tooth width of the tooth body (21) towards one end outside the stator is T5, the tooth width of the tooth body (21) towards one end at the center of the stator is T3, and T3: t5>0.6;

the stator teeth (2) are provided with tooth shoes (22), the tooth shoes (22) are arranged on one side of the tooth body (21) facing the center of the stator, and the tooth shoes (22) comprise two bevel edges respectively connected with the tooth body (21);

the angle formed by the bevel edge and the side edge of the tooth body (21) is alpha, 130 degrees < alpha <150 degrees.

2. The stator according to claim 1, characterized in that the range of the included angle θ is as follows: 0 DEG < theta <5 deg.

3. The stator according to claim 1, characterized in that the angle between the side edge of the tooth body (21) and the center line of the stator equally dividing the tooth body (21) is one half of the angle θ.

4. The stator according to claim 1, characterized in that the length of the stator teeth (2) is T1, the sum of the length of the stator teeth (2) and the thickness of the stator yoke (1) being T2;

the numerical ratio of T1 to T2 ranges from 0.5 to 0.9.

5. The stator according to claim 1, characterized in that the slot width of the stator slot (3) is T4, the ratio of the length of T3 to T4 being in the range of 1.45 to 1.55.

6. The stator according to claim 1, characterized in that the tooth shoe (22) comprises a connecting portion (221) and an extension portion (222), the connecting portion (221) being connected to the tooth body portion (21), the extension portion (222) being connected to a side of the connecting portion (221) facing the center of the stator;

the connecting portion (221) is trapezoidal in radial cross section of the stator, and the extending portion (222) is rectangular.

7. A stator according to claim 1, characterized in that the angle formed by the oblique edge and the side edge of the tooth body (21) is rounded.

8. An electric machine comprising a stator as claimed in any one of claims 1-7.