Oblique shoulder arc-shaped stator slot

Abstract

The invention discloses an inclined shoulder arc-shaped stator slot, which comprises a stator slot and a stator iron core, the stator slot is composed of an inclined shoulder slot and a bottom slot connected with the inclined shoulder slot, the section, far away from the bottom slot, of the inclined shoulder slot and the stator iron core are arranged in a semi-closed manner, and the distance between the slot walls at the two sides of the inclined shoulder slot is gradually increased towards the direction of the bottom slot. The end of the bottom groove is arc-shaped, and the arc-shaped end of the bottom groove and the groove walls on the two sides of the oblique shoulder groove are subjected to chamfering treatment. According to the designed inclined shoulder arc-shaped stator grooves, under the condition of the same amount of copper in the grooves, the groove fullness rate of the arc-shaped inclined shoulder grooves is lower, the wire embedding difficulty is reduced, the electrical failure rate of a stator coil is reduced, the shape of a yoke part can be adjusted so as to improve the magnetic density distribution condition of the yoke part, and the multiple inclined shoulder arc-shaped grooves are formed in the circumferential direction so as to improve the magnetic density distribution condition of the yoke part. The proportion of the tooth part area to the yoke part area of the stator is more reasonable, so that the flux density distribution of the yoke part of the stator is more uniform, and the electromagnetic noise and vibration of the motor are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of three-phase asynchronous motors, and in particular relates to an oblique shoulder arc-shaped stator slot. Background Art

[0002] In motor design, the design of the stator slot is a crucial link. The slot design includes shape design, slot size and slot matching quantity. The stator slot determines the performance and efficiency of the motor.

[0003] The stator slot type is mainly inclined shoulder round bottom slot. Although this slot type shows good advantages in performance parameters such as motor efficiency, speed, output torque and noise, there is still room for improvement in the overall slot area. Through the finite element analysis of the stator magnetic field, the distribution of magnetic flux density in the teeth and yoke is uneven, and there are still some unreasonable uses. Summary of the invention

[0004] The present invention aims at the problem of uneven distribution of magnetic flux density in the teeth and yoke of the stator slot type with oblique shoulder and round bottom slot in the prior art, and proposes the following technical solution:

[0005] A slanted shoulder arc-shaped stator slot comprises: a stator slot and a stator core, wherein the stator slot consists of a slanted shoulder slot and a bottom slot connected to the slanted shoulder slot, a section of the slanted shoulder slot away from the bottom slot is semi-closed between the stator core, the spacing between the slot walls on both sides of the slanted shoulder slot gradually increases toward the bottom slot, the end of the bottom slot is arc-shaped, and the arc-shaped end of the bottom slot and the slot walls on both sides of the slanted shoulder slot are chamfered.

[0006] As a preferred embodiment of the above technical solution, the center of the arc-shaped end of the bottom slot is coaxially arranged with the center of the stator core.

[0007] As a preferred embodiment of the above technical solution, there are multiple stator slots, and the multiple stator slots are circumferentially opened on the stator core.

[0008] As a preferred embodiment of the above technical solution, the stator core is formed by stacking a plurality of stator laminations, and the stator slots and the stator laminations are integrally stamped.

[0009] The beneficial effects of the present invention are:

[0010] 1. The designed oblique shoulder arc stator slot has a lower slot fill rate under the condition of the same amount of copper in the slot, which reduces the difficulty of wire embedding and the electrical failure rate of the stator coil. It can also adjust the shape of the yoke to improve the magnetic flux distribution of the yoke.

[0011] 2. Multiple oblique shoulder arc grooves are arranged in the circumferential direction, which can make the ratio of the stator tooth area and the yoke area more reasonable, and then make the magnetic flux distribution of the stator yoke more uniform, thereby improving the electromagnetic noise and vibration of the motor;

[0012] 3. By setting the oblique shoulder arc groove, the copper content of the stator can be appropriately increased when designing special motors, which can improve the motor efficiency and reduce the temperature rise of the motor, thereby reducing the stator electrical density. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 What is shown is a schematic diagram of the overall structure of an embodiment;

[0014] Figure 2 Shown is a front view of a stator slot in the prior art;

[0015] Figure 3 Shown is a front view of a stator slot in an embodiment;

[0016] Figure 4 The figure shows the magnetic flux distribution diagram of the stator core using the oblique shoulder arc-shaped stator slots in the embodiment.

[0017] In the figure: 10, stator core; 20, stator slot; 21, oblique shoulder slot; 22, bottom slot. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings of the specification.

[0019] Example

[0020] Figure 1-Figure 4 In the invention, a stator slot 20 with an oblique shoulder is provided, comprising: a stator slot 20 and a stator core 10, characterized in that the stator slot 20 is composed of an oblique shoulder slot 21 and a bottom slot 22 connected to the oblique shoulder slot 21, a section of the oblique shoulder slot 21 away from the bottom slot 22 is semi-closed between the stator core 10, the spacing between the slot walls on both sides of the oblique shoulder slot 21 gradually increases toward the bottom slot 22, the end of the bottom slot 22 is arc-shaped, and the arc-shaped end of the bottom slot 22 and the slot walls on both sides of the oblique shoulder slot 21 are chamfered.

[0021] There are a plurality of stator slots 20 , and the plurality of stator slots 20 are circumferentially arranged on the stator core 10 .

[0022] exist Figure 2 and Figure 3In the embodiment, the original stator slot 20 has a slot type of an oblique shoulder circular bottom slot 22, whose slot height is H0, the upper width is 2RO, which is the same as the diameter of the bottom slot 22, and the bottom width is bs1. In the present technical solution, the stator slot 20 has a slot type of an oblique shoulder arc bottom slot 22, whose slot height is H1, the height of H1 is the same as H0, the upper width is bs3, bs3 is the same as the width of 2RO, the bottom width is bs2, bs2 is the same as the width of bs1, and the end diameter of the bottom slot 22 of the arc bottom slot 22 stator slot 20 is R, and the chamfer diameter of the arc end of the bottom slot 22 and the slot walls on both sides of the oblique shoulder slot 21 is R2, ensuring that the bottom slot 22 of the circular bottom slot 22 stator slot 20 and the bottom slot 22 of the arc bottom slot 22 stator slot 20 have the same area, so that the bottom area of ​​the stator slot 20 is increased, so that the distance between the stator slot 20 and the yoke width H1 of the stator core 10 is the same, and the slot type bottom is flatter.

[0023] The designed oblique shoulder arc-shaped stator slot 20 has a lower slot fill rate than the arc-shaped oblique shoulder slot 21 under the condition of the same amount of copper in the slot, which reduces the difficulty of wire embedding, reduces the electrical failure rate of the stator coil, and can adjust the shape of the yoke to improve the magnetic flux distribution of the yoke.

[0024] In addition, a plurality of oblique shoulder arc grooves are arranged in the circumferential direction, which can make the ratio of the stator tooth area and the yoke area more reasonable, thereby making the magnetic flux density distribution of the stator yoke more uniform, thereby improving the electromagnetic noise and vibration of the motor.

[0025] Figure 1 and Figure 3 In the embodiment, the center of the arc-shaped end of the bottom slot 22 is coaxially arranged with the center of the stator core 10 .

[0026] When designing special motors, the amount of copper used can be appropriately increased by setting up oblique shoulder arc grooves, which can improve the motor efficiency while reducing the motor temperature rise, thereby reducing the stator electrical density.

[0027] Figure 1 In the embodiment, the stator core 10 is formed by stacking a plurality of stator laminations, and the stator slots 20 are integrally stamped and formed with the stator laminations.

[0028] The stator core 10 may be produced by stacking stator laminations, which facilitates the production of the stator core 10 and the stator slots 20 .

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A slanted shoulder arc-shaped stator slot (20), comprising: A stator slot (20) and a stator core (10), characterized in that the stator slot (20) consists of an oblique shoulder slot (21) and a bottom slot (22) connected to the oblique shoulder slot (21); a section of the oblique shoulder slot (21) away from the bottom slot (22) is semi-closed between the stator core (10); the spacing between the slot walls on both sides of the oblique shoulder slot (21) gradually increases toward the bottom slot (22); the end of the bottom slot (22) is arc-shaped; the arc-shaped end of the bottom slot (22) and the slot walls on both sides of the oblique shoulder slot (21) are chamfered.

2. The oblique shoulder arc-shaped stator slot (20) according to claim 1, characterized in that: The center of the arc-shaped end of the bottom slot (22) is coaxially arranged with the center of the stator core (10).

3. The oblique shoulder arc-shaped stator slot (20) according to claim 1, characterized in that: There are a plurality of stator slots (20), and the plurality of stator slots (20) are circumferentially arranged on the stator core (10).

4. The oblique shoulder arc-shaped stator slot (20) according to claim 3, characterized in that: The stator core (10) is formed by stacking a plurality of stator laminations, and the stator slots (20) are integrally stamped and formed with the stator laminations.

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