阅读说明：本技术 一种7.5°步距角步进电机 (7.5-degree step angle stepping motor ) 是由 彭光明 金万兵 蒋浣浣 于 2019-08-20 设计创作，主要内容包括：本发明涉及一种7.5°步距角步进电机,包括绕组、转子和定子,所述转子设有12对极,所述定子为分体式结构,其包括偶数个形状相同的定子块,每个所述定子块分布有至少两个定子齿,每个定子块中的相邻定子齿之间形成用于绕组绕制的定子轭部。与现有技术相比,本发明具有大大减小电机槽口尺寸对电机绕线的限制,有利于提升电机槽面积的利用率等优点。(The invention relates to a 7.5-degree step angle stepping motor which comprises a winding, a rotor and a stator, wherein the rotor is provided with 12 pairs of poles, the stator is of a split structure and comprises an even number of stator blocks with the same shape, at least two stator teeth are distributed on each stator block, and a stator yoke part for winding the winding is formed between the adjacent stator teeth in each stator block. Compared with the prior art, the motor winding device has the advantages that the limitation of the size of the motor notch on the motor winding is greatly reduced, the utilization rate of the motor slot area is favorably improved, and the like.)

1. A7.5-degree step angle stepping motor comprises a winding, a rotor and a stator, wherein the rotor is provided with 12 pairs of poles, and the 7.5-degree step angle stepping motor is characterized in that the stator is of a split structure and comprises an even number of stator blocks with the same shape, at least two stator teeth are distributed on each stator block, and a stator yoke part for winding the winding is formed between the adjacent stator teeth in each stator block.

2. A 7.5 ° step angle stepper motor as defined in claim 1, wherein the outer diameter of said stator yoke is smaller than the stator outer diameter.

3. A 7.5 ° step-by-step motor according to claim 1, wherein the included angle between adjacent stator pieces is 52.5 ° or 37.5 °, the stator pieces are of a structure with one wider end and the other narrower end, and the stator teeth are arranged at the narrower end.

4. A 7.5 ° step-by-step motor as claimed in claim 1, wherein there are four stator pieces, and there are two stator teeth on each stator piece, and the angle between the two stator teeth is 45 °.

5. A7.5 ° step-by-step motor according to claim 4, wherein, in the counterclockwise direction, four stator pieces are stator piece 11, stator piece 12, stator piece 13 and stator piece 14 in this order, and the included angles between the stator pieces are 52.5 °, 37.5 °, 52.5 ° and 37.5 ° in this order, wherein stator piece 11 and stator piece 13 belong to phase A, and stator piece 12 and stator piece 14 belong to phase B.

6. A7.5 ° step-by-step motor as claimed in claim 5, wherein in the counterclockwise direction, the stator teeth of said stator piece 11 are TA1 and TA2, the stator teeth of said stator piece 13 are TA3 and TA4, the stator teeth of said stator piece 12 are TB1 and TB2, and the stator teeth of said stator piece 14 are TB3 and TB 4;

stator yokes YA1, YA2, YB1 and YB2 are defined between the stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, TB3 and TB4 in sequence and have thicknesses of LA1, LA2, LB1 and LB2 respectively, wherein LA1 is LA2 is LB1 is LB 2.

7. A 7.5 ° step-by-step motor according to claim 1, wherein said stator pieces are provided in two, that is, stator piece 21 and stator piece 22, wherein said stator piece 21 is phase a, said stator piece 22 is phase B, each stator piece has four stator teeth, and the angle between the two ends of the two stator pieces is 37.5 ° and 52.5 °.

8. A7.5 ° step-by-step motor according to claim 7, wherein, in the clockwise direction, the stator teeth of the A-phase stator piece 21 are TA1, TA2, TA3 and TA4, and the included angles between the four stator teeth are 30 °, 75 ° and 30 °;

according to the clockwise direction, the stator teeth on the B-phase stator block 22 are sequentially TB1, TB2, TB3 and TB4, and the included angles among the four stator teeth are sequentially 30 degrees, 75 degrees and 30 degrees;

stator yokes YA1, YA2, YA3, YB1, YB2 and YB3 formed between stator teeth TA1 and TA2, TA3 and TA4, TA2 and TA3, TB3 and TB4, TB1 and TB2, and TB2 and TB3 in sequence have thicknesses of LA1, LA2, LA3, LB1, LB2 and LB3 respectively, wherein LA1 is LA 2-LB 1-LB 2, and 1.0 is LA1< LA 3-LB 3<3.0 is LA 1.

9. A 7.5 ° step-by-step motor according to claim 1, wherein there are two stator pieces, namely stator piece 31 and stator piece 32, wherein said stator piece 31 is phase a, said stator piece 32 is phase B, each stator piece has six stator teeth, the included angle between the two ends of the two stator pieces is 37.5 ° and 52.5 °, and the ratio of the number of stator teeth to the number of rotor poles is 1.

10. A 7.5 ° step-angle stepping motor according to claim 9, wherein, in the counterclockwise direction, the stator teeth of the a-phase stator piece 31 are TA1, TA2, TA5, TA6, TA3 and TA4, and the included angles between the stator teeth are 30 °, 15 °, 30 ° and 30 °;

the stator yokes formed between the stator teeth TA1 and TA2, TA2 and TA5, TA5 and TA6, TA6 and TA3, and TA3 and TA4 are YA1, YA3, YA5, YA4 and YA2 in sequence, and the stator yoke thicknesses are LA1, LA3, LA5, LA4 and LA2 in sequence, wherein LA1 is LA2, LA3 is LA4, 1.0 is LA1< LA3<3.0 is LA1, and 2.0 is LA1< LA5<4.0 is LA 1.

Technical Field

The invention relates to a stepping motor, in particular to a 7.5-degree stepping angle stepping motor.

Background

The structure of the existing two-phase hybrid 7.5-degree step-angle stepping motor is shown in fig. 1 and fig. 2, wherein 1A and 1C are stators of a first scheme and a second scheme respectively, 2 is a rotor of the existing scheme, the rotor can be formed by lamination of punching sheets or can be a permanent magnet rotor, but the punching sheets are N, S alternated, and the total number of the poles is 12.

In the first prior art, the stator has 8 main poles, a phase main poles a1, a2, A3, a4 and B phase main poles B1, B2, B3 and B4, each of which has one stator tooth, and there are 8 stator teeth TA1, TA2, TA3, TA4, TB1, TB2, TB3 and TB 4. The 8 main poles are arranged in the anticlockwise direction and are A1, B1, A2, B2, A3, B3, A4 and B4, and included angles among the 8 main poles are respectively 37.5 degrees, 67.5 degrees, 37.5 degrees and 67.5 degrees.

In the second conventional scheme, the stator has 8 main poles, a phase a main poles a1, a2, A3, a4 and a phase B main poles B1, B2, B3 and B4, each main pole has one stator tooth, and there are 8 stator teeth TA1, TA2, TA3, TA4, TB1, TB2, TB3 and TB 4. The 8 main poles are arranged in the anticlockwise direction and are A1, A2, B1, B2, A3, A4, B3 and B4, and included angles among the 8 main poles are respectively 45 degrees, 52.5 degrees, 45 degrees, 37.5 degrees, 45 degrees, 52.5 degrees, 45 degrees and 37.5 degrees.

In the existing scheme I and scheme II, two defects exist:

1) the number of stator teeth is less, and the ratio of the number of stator teeth to the number of rotor pole pairs is lower, so that the integral output torque of the motor is lower. In existing schemes 1 and 2, the number of stator teeth/number of rotor pole pairs is: 8/12 ═ 0.75.

2) When the outer diameter of the stator is less than 20mm, the notch of the motor is very small, and difficulty is caused in winding the motor; meanwhile, because the winding is wound on the main electrode of the motor, the space of the winding mouth for entering and exiting the slot can occupy the area in the slot, the slot fullness rate of the motor is influenced, and the output torque of the motor is further influenced.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned deficiencies of the prior art and providing a 7.5 step angle stepper motor.

The purpose of the invention can be realized by the following technical scheme:

a7.5-degree step angle stepping motor comprises a winding, a rotor and a stator, wherein the rotor is provided with 12 pairs of poles, the stator is of a split structure and comprises an even number of stator blocks with the same shape, at least two stator teeth are distributed on each stator block, and a stator yoke part for winding the winding is formed between the adjacent stator teeth in each stator block.

Preferably, the outer diameter of the stator yoke is smaller than the stator outer diameter.

Preferably, an included angle between adjacent stator blocks is 52.5 degrees or 37.5 degrees, the stator blocks are of a structure with one wide end and the other narrow end, and the stator teeth are arranged at the narrow end.

Preferably, the number of the stator blocks is four, each stator block is provided with two stator teeth, and an included angle between the two stator teeth is 45 degrees.

Preferably, in the counterclockwise direction, the four stator blocks are the stator block 11, the stator block 12, the stator block 13 and the stator block 14 in sequence, and included angles between the stator blocks are 52.5 °, 37.5 °, 52.5 ° and 37.5 ° in sequence, wherein the stator block 11 and the stator block 13 belong to phase a, and the stator block 12 and the stator block 14 belong to phase B.

Preferably, in the counterclockwise direction, the stator teeth on stator piece 11 are sequentially TA1 and TA2, the stator teeth on stator piece 13 are sequentially TA3 and TA4, the stator teeth on stator piece 12 are sequentially TB1 and TB2, and the stator teeth on stator piece 14 are sequentially TB3 and TB 4;

stator yokes YA1, YA2, YB1 and YB2 are defined between the stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, TB3 and TB4 in sequence and have thicknesses of LA1, LA2, LB1 and LB2 respectively, wherein LA1 is LA2 is LB1 is LB 2.

Preferably, the number of the stator blocks is two, namely a stator block 21 and a stator block 22, wherein the stator block 21 is of phase a, the stator block 22 is of phase B, each stator block is provided with four stator teeth, and an included angle between two ends of the two stator blocks is 37.5 degrees and 52.5 degrees.

Preferably, in the clockwise direction, the stator teeth on the a-phase stator piece 21 are sequentially TA1, TA2, TA3 and TA4, and the included angles between the four stator teeth are sequentially 30 °, 75 ° and 30 °;

according to the clockwise direction, the stator teeth on the B-phase stator block 22 are sequentially TB1, TB2, TB3 and TB4, and the included angles among the four stator teeth are sequentially 30 degrees, 75 degrees and 30 degrees;

stator yokes YA1, YA2, YA3, YB1, YB2 and YB3 formed between stator teeth TA1 and TA2, TA3 and TA4, TA2 and TA3, TB3 and TB4, TB1 and TB2, and TB2 and TB3 in sequence have thicknesses of LA1, LA2, LA3, LB1, LB2 and LB3 respectively, wherein LA1 is LA 2-LB 1-LB 2, and 1.0 is LA1< LA 3-LB 3<3.0 is LA 1.

Preferably, the number of the stator blocks is two, namely a stator block 31 and a stator block 32, wherein the stator block 31 is in phase a, the stator block 32 is in phase B, each stator block is provided with six stator teeth, an included angle between two ends of the two stator blocks is 37.5 degrees and 52.5 degrees, and the ratio of the number of the stator teeth to the number of the rotor poles is 1.

Preferably, in the counterclockwise direction, the stator teeth on the a-phase stator piece 31 are sequentially TA1, TA2, TA5, TA6, TA3 and TA4, and the included angles between the stator teeth are sequentially 30 °, 15 °, 30 ° and 30 °;

the stator yokes formed between the stator teeth TA1 and TA2, TA2 and TA5, TA5 and TA6, TA6 and TA3, and TA3 and TA4 are YA1, YA3, YA5, YA4 and YA2 in sequence, and the stator yoke thicknesses are LA1, LA3, LA5, LA4 and LA2 in sequence, wherein LA1 is LA2, LA3 is LA4, 1.0 is LA1< LA3<3.0 is LA1, and 2.0 is LA1< LA5<4.0 is LA 1.

Compared with the prior art, the invention has the following advantages:

(1) the iron core segmentation and yoke part winding technology of the invention can greatly reduce the limitation of the motor notch size on the motor winding; meanwhile, the winding is at the yoke part of the motor, the in-out space of the winding line nozzle is in the radial direction, the area of the motor groove is not occupied, and the utilization rate of the groove area of the motor is improved.

(2) The iron core segmentation technology is beneficial to realizing the modularized winding production of the motor and improving the production efficiency of the motor.

(3) The invention can increase the number of the stator teeth of the motor stator, is beneficial to improving the utilization rate of the motor magnetic field and increasing the output torque of the motor.

Drawings

FIG. 1 is a schematic structural diagram of a first conventional scheme;

FIG. 2 is a schematic structural diagram of a second conventional solution;

FIG. 3 is a schematic structural view of embodiment 1;

FIG. 4 is a schematic structural view of embodiment 2;

fig. 5 is a schematic structural view of embodiment 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

In order to improve the proportion of the number of teeth of a stator of a motor and the number of pole pairs of a rotor, reduce the difficulty of winding of the motor and improve the slot fullness rate of the motor, the following measures are adopted:

1) under the condition of keeping the number of pole pairs unchanged, the number of the stator teeth of the motor is increased as much as possible.

2) The adoption is cut apart the iron core technique, reduces the restriction of motor notch size to the wire winding of motor greatly, and simultaneously, the winding coiling of motor is in motor yoke portion, and the wire winding mouth does not occupy motor groove area, has increased the full rate in groove of motor.

The 7.5-degree step angle stepping motor comprises a winding, a rotor and a stator, wherein the stator is of a split structure and comprises an even number of stator blocks with the same shape, at least two stator teeth are distributed on each stator block, and a stator yoke part for winding the winding is formed between the adjacent stator teeth in each stator block.

Example 1

As shown in fig. 3, the whole stator is divided into four stator blocks, the four stators are all in the same structure, each stator block is provided with two stator teeth, and the included angle between the two stator teeth is 45 °. According to the anticlockwise direction, the four stator blocks are the stator block 11, the stator block 12, the stator block 13 and the stator block 14 in sequence, and included angles among the stator blocks are 52.5 degrees, 37.5 degrees, 52.5 degrees and 37.5 degrees in sequence, wherein the stator block 11 and the stator block 13 belong to phase A, and the stator block 12 and the stator block 14 belong to phase B. The outer diameter of the stator yoke part is smaller than that of the stator, and the stator block is in an H shape with one wide end and the other narrow end.

The stator yokes YA1, YA2, YB1 and YB2 are defined between two stator teeth of each stator block, and the thicknesses of the stator yokes YA1, YA2, YB1 and YB2 are LA1, LA2, LB1 and LB2 respectively, wherein LA1 is LA2, LB1 is LB 2.

During the wire winding, the wire winding nozzle winds from the notch around the stator yoke part up and down, the moving direction of the wire nozzle is the radius direction, the wire nozzle is different from the circumferential direction of the winding on the teeth, and the wire nozzle can not occupy the space of the motor slot when being wound in the radius direction, so that the full rate of the motor slot is favorably improved. Meanwhile, the structure of the stator block greatly improves the winding efficiency of the motor.

EXAMPLE 2

As shown in fig. 4, the integral stator is divided into two stator pieces 21 and 22, the two stators are the same, wherein the stator piece 21 is a phase a, the stator piece 22 is a phase B, each stator piece is provided with four stator teeth, and the included angle between the two ends of the two stator pieces is 37.5 degrees and 52.5 degrees.

According to the clockwise direction, the stator teeth on the A-phase stator piece 21 are sequentially TA1, TA2, TA3 and TA4, and the included angles among the four stator teeth are sequentially 30 degrees, 75 degrees and 30 degrees.

According to the clockwise direction, the stator teeth on the B-phase stator block 22 are sequentially TB1, TB2, TB3 and TB4, and the included angles among the four stator teeth are sequentially 30 degrees, 75 degrees and 30 degrees.

Compared with embodiment 1, embodiment 2 adds new stator yokes YA3 and YB3, which means that new winding space is added, and the output torque of the motor is increased.

In this embodiment, the thicknesses of the stator yokes YA1, YA2, YA3, YB1, YB2 and YB3 are LA1, LA2, LA3, LB1, LB2 and LB3 (the thicknesses of the B-phase yokes are not shown), respectively, where LA1 is LA 2-LB 1-LB 2, and 1.0 LA1 is LA 3-LB 3-LA 1.

Example 3

As shown in fig. 5, in embodiment 3, on the basis of embodiment 2, stator teeth TA5, TA6, TB5, and TB6 are added between stator teeth TA2, TA3, TB2, and TB3 of the A, B phase stator core, respectively. The included angle between the two ends of the two stator blocks is 37.5 degrees and 52.5 degrees.

A. After the stator teeth are added to the B two-phase stator blocks, the ratio of the number of the stator teeth to the number of the rotor poles of the motor is 12/12 ═ 1, the utilization rate of the magnetic field of the motor is improved, and the output torque of the motor is increased.

In embodiment 3, the stator pieces 31 and 32 are the same, the counter-clockwise stator teeth of the a-phase stator pieces are sequentially TA1, TA2, TA5, TA6, TA3 and TA4, and the included angles between the stator teeth are sequentially 30 °, 15 °, 30 ° and 30 °.

The yokes of the A-phase stator blocks in the counterclockwise direction are YA1, YA3, YA5, YA4 and YA2 in sequence, and the thicknesses of the yokes are LA1, LA3, LA5, LA4 and LA2 respectively. LA 1-LA 2, LA 3-LA 4, 1.0-LA 1< LA3< 3.0-LA 1, and 2.0-LA 1< LA5< 4.0-LA 1.

Meanwhile, coils may be wound on the stator yokes YA1, YA2, YA3, YA4, YA5 (wherein the winding portions of the stator yokes YA5 are not identified).

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.