CN108736598B

CN108736598B - Stator of stepping motor and stepping motor with stator

Info

Publication number: CN108736598B
Application number: CN201710256352.7A
Authority: CN
Inventors: 彭光明; 金万兵; 张喜臣
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2017-04-19
Filing date: 2017-04-19
Publication date: 2023-12-12
Anticipated expiration: 2037-04-19
Also published as: CN108736598A

Abstract

The invention relates to a stator of a stepping motor, which comprises a stator core (1) and a stator insulation framework (5), wherein a plurality of stator main poles (2) are uniformly arranged in the circumferential direction of the stator core (1), a plurality of stator small teeth (3) are arranged at the inner ends of the stator main poles (2), the stator small teeth (3) are connected with the stator main poles (2) through stator pole shoes (4), stator windings are wound on the stator insulation framework (5), the stator pole shoes (4) extend along the circumferential direction of two sides of the stator main poles (2), and the distance L between every two adjacent stator pole shoes (4) is more than or equal to 0.5mm. Compared with the prior art, the motor winding area and the motor winding area utilization rate can be increased, the torque of the motor can be increased, the motor temperature rise can be reduced, and the like.

Description

Stator of stepping motor and stepping motor with stator

Technical Field

The present invention relates to a motor stator and a stepping motor, and more particularly, to a stepping motor stator and a stepping motor having the same.

Background

The prior iron core punching sheet of the hybrid stepping motor has the structure shown in the following figure 1, a plurality of stator main poles 2 are uniformly distributed in the circumferential direction of a stator iron core 1, a plurality of stator small teeth 3 are arranged at the inner ends of the stator main poles, and the stator small teeth 3 are connected with the stator main poles 2 through stator pole shoes 4.

The stator insulation framework 5 is sleeved on the stator main pole 2, a stator coil is wound on the stator insulation framework 5, and the occupied area 6 of the first stator winding is limited by the boundary line 7 of the wire mouth of the winding machine and the stator insulation framework 5. The area defined by the boundary line 7 of the wire mouths of the two winding machines in one groove is the minimum space for the wire mouths to enter and exit when the winding machines wind the wire, and the width of the narrow space is defined as L. The intersection point of the wire mouth boundary line 7 of the winding machine and the stator insulation framework 5 is P, the vertex of the insulation framework 5 above the stator tooth shoe 4 is Q, the connecting line of P and Q is a stator winding boundary line 8, and the connecting line and the framework (M, N) together define the occupied area 6 of the first stator winding on the stator main pole.

The first stator winding occupies an approximately trapezoidal area 6, MP is the upper bottom, NQ is the lower bottom, and MN is high. When the NQ length is approximately equal to the MP, the available area of the winding is the largest; if MP is much larger than NQ, the winding near the P point will slip to the Q point, causing disorder, and affecting the utilization of the winding area. Severely, the windings would slip into the notch area and the stator winding failed.

Meanwhile, under the condition that the motor tooth pitch angle Ts and the small tooth width Bt of the stator are fixed, the too wide stator notch width B can cause the increase of the cogging torque of the motor, and the positioning accuracy of the motor is affected.

Disclosure of Invention

The present invention is directed to a stator of a stepper motor and a stepper motor with the stator, which overcome the defects of the prior art.

The aim of the invention can be achieved by the following technical scheme:

the stator of the stepping motor comprises a stator core and a stator insulation framework, wherein a plurality of stator main poles are uniformly arranged in the circumferential direction of the stator core, a plurality of stator small teeth are arranged at the inner end of each stator main pole, the stator small teeth and the stator main poles are connected through stator pole shoes, stator windings are wound on the stator insulation framework, the stator pole shoes extend along the circumferential direction of two sides of each stator main pole, and the distance L between every two adjacent stator pole shoes is greater than or equal to 0.5mm.

The extension part of the stator pole shoe is intersected with the boundary line of the wire mouth of the winding machine, and the intersection point is one.

The extension part of the stator pole shoe is intersected with the boundary line of the wire mouth of the winding machine, and the number of the intersection points is two.

The inner end of each stator main pole is provided with Ns stator small teeth, and Ns is more than or equal to 2 and less than or equal to 5.

The Ns is preferably 2.

The Ns is preferably 3.

A stepping motor with a stator comprises a rotor, and the motor also comprises the stator of the stepping motor.

The rotor comprises a rotor core, wherein Nr rotor small teeth are uniformly distributed on the rotor core, and Nr is more than or equal to 14 and less than or equal to 50.

The Nr is preferably 18, 22 or 26.

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

1) The tooth boots extending to the two sides of the main pole of the motor in the circumferential direction can increase the winding area of the motor and improve the utilization rate of the winding area of the motor, thereby being beneficial to increasing the torque of the motor and reducing the temperature rise of the motor.

2) The extended pole shoe can improve the magnetic field distribution of the relative position of the motor tooth slot, reduce the tooth slot torque of the motor and improve the operation precision of the motor.

Drawings

FIG. 1 is a schematic diagram of a prior art hybrid stepper motor core punching sheet;

wherein 1 is a stator core, 2 is a stator main pole, 3 is a stator small tooth, 4 is a stator tooth boot, 5 is a stator insulation framework, 6 is the occupied area of a first stator winding, 7 is the boundary line of a wire mouth of a winding machine, 8 is the boundary line of the stator winding, L is the minimum width of a wire mouth of the winding machine for winding, B is the width of a stator notch, bt is the small tooth width of the stator, and Ts is the tooth angle of the stator;

FIG. 2 is a schematic structural diagram of embodiment 1 of the present invention;

wherein 6 is the occupied area of the first stator winding, 7 is the boundary line of the wire mouth of the winding machine, 9 is the occupied area of the second stator winding, and L is the minimum width of the wire mouth of the winding machine when winding wire;

FIG. 3 is a schematic view of the minimum width of the stator slot and the wire nozzle of the winding machine of embodiment 1 of the present invention during winding;

wherein L is the minimum width of a wire nozzle of a winding machine in and out during winding, and B is the width of a slot opening of a stator;

FIG. 4 is a schematic structural diagram of embodiment 2 of the present invention;

wherein 6 is the area occupied by the first stator winding, 7 is the boundary line of the wire mouth of the winding machine, 9 is the area occupied by the second stator winding, L is the minimum width of the wire mouth of the winding machine for winding, and B is the notch of the stator.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

Example 1

As shown in FIG. 2, the stator pole shoe extends towards the circumferential direction of the two sides of the main pole and intersects with the wire mouth boundary line 7 of the winding machine, and the intersection points are R and S, so that the insulating framework can also extend from the point Q to the point Q ' intersecting with the wire mouth boundary line 7 of the winding machine, the occupied area of the stator winding is the sum of the occupied area 6 of the first stator winding and the occupied area 9 of the second stator winding, the envelope line is the area defined by PMNQ ', and the NQ ' and the MP are approximately equal, thereby effectively improving the utilization rate of the winding area and simultaneously avoiding the winding failure of the motor. The large winding area and the high winding area utilization ratio are beneficial to improving the running torque of the motor and reducing the temperature rise of the motor.

As shown in FIG. 3, under the condition that the small tooth width Bt of the motor and the tooth pitch angle Ts of the stator are not changed, the minimum distance between the main poles of the stator is changed from the notch width B of the prior scheme to the minimum width L (L is more than or equal to 0.5 mm) of the wire nozzle of the winding machine during winding, the magnetic field distribution of the relative position of a motor tooth slot is improved, the torque of the motor tooth slot is reduced, and the running precision of the motor is improved.

Example 2

As shown in fig. 4, the stator pole shoe extends towards the circumferential direction of the two sides of the main pole and intersects with the boundary line 7 of the wire mouth of the winding machine, the intersection point is R, the outer side points T and R of the stator teeth are connected to form the outline of the outer side of the stator small teeth, so that the insulating framework can also extend from the point Q to the point Q ' intersecting with the boundary line 7 of the wire mouth of the winding machine, the occupied area of the stator winding is the sum of the occupied area 6 of the first stator winding and the occupied area 9 of the second stator winding, the envelope line is the area defined by PMNQ ', the NQ ' and the MP are approximately equal, the utilization rate of the winding area is effectively improved, and meanwhile, the winding failure of the motor is avoided. The large winding area and the high winding area utilization ratio are beneficial to improving the running torque of the motor and reducing the temperature rise of the motor.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. The stator of the stepping motor comprises a stator iron core (1) and a stator insulation framework (5), wherein a plurality of stator main poles (2) are uniformly arranged in the circumferential direction of the stator iron core (1), a plurality of stator small teeth (3) are arranged at the inner ends of the stator main poles (2), the stator small teeth (3) are connected with the stator main poles (2) through stator pole shoes (4), a stator winding is wound on the stator insulation framework (5), an area defined by a boundary line (7) between two winding machine wire mouths in a stator slot is a minimum space for a wire mouth to enter and exit when the winding machine winds, the width of the minimum space is defined as L, and the stator pole shoes (4) extend along the circumferential direction of two sides of the stator main poles (2), and the distance between adjacent stator pole shoes (4) is the width L of the minimum space, wherein L is more than or equal to 0.5mm;

the extension part of the stator pole shoe (4) is intersected with a line (7) of the wire mouth of the winding machine, and the intersection point is one; or the extension part of the stator pole shoe (4) is intersected with the boundary line (7) of the wire mouth of the winding machine, and the number of the intersection points is two.

2. A stator for a stepper motor according to claim 1, characterized in that the inner end of each of said main stator poles (2) is provided with Ns stator teeth (3), and that 2 n is less than or equal to 5.

3. A stepper motor stator as defined in claim 2, wherein Ns is 2.

4. A stepper motor stator as defined in claim 2, wherein Ns is 3.

5. A stepper motor having a stator comprising a rotor, wherein said motor further comprises a stepper motor stator as defined in any one of claims 1-4.

6. The stepper motor of claim 5 wherein the rotor comprises a rotor core having Nr rotor teeth evenly distributed therein and 14 Nr 50.

7. The stepper motor of claim 6, wherein Nr is 18, 22 or 26.