阅读说明：本技术 一种W-Pin绕组电机的半闭口槽式定子冲片成型方法 (Method for forming semi-closed slot type stator punching sheet of W-Pin winding motor ) 是由 王迪 唐正宇 李节宝 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种W-Pin绕组电机的半闭口槽式定子冲片成型方法,通过两次冲压的方式,先使得齿靴的轴线与齿体的轴线之间的夹角α相对于初始位置减小,然后再使得该夹角α相对于初始位置增大,从而实现了应力的先增大、后减小、然后再增大的变化,进而使得齿靴的应力分布较为均匀,缓解了应力集中的状况,同时能够满足W-Pin绕组电机的径向扩线、大开口下线要求,保证了齿体结构的综合损伤最小,提高了整体结构的可靠性,减小了对电机性能的影响。(The invention discloses a method for forming a semi-closed slot type stator punching sheet of a W-Pin winding motor, which is characterized in that an included angle alpha between the axis of a tooth shoe and the axis of a tooth body is reduced relative to an initial position through a mode of twice punching, and then the included angle alpha is increased relative to the initial position, so that the change of increasing, reducing and increasing stress is realized, the stress distribution of the tooth shoe is more uniform, the stress concentration condition is relieved, the radial wire expansion and large-opening offline requirements of the W-Pin winding motor can be met, the comprehensive damage of the tooth body structure is ensured to be minimum, the reliability of the whole structure is improved, and the influence on the performance of the motor is reduced.)

1. A method for forming a semi-closed slot type stator punching sheet of a W-Pin winding motor is characterized by comprising the following steps:

s1: punching the blank to obtain a stator punching sheet crude product, wherein an included angle between the axis of the tooth shoe and the axis of the tooth body is alpha, the arc radius formed between the inner side edge of the tooth shoe and the bottom surface of the tooth body is R1, and the arc radius formed between the outer side edge of the tooth shoe and the side surface of the tooth body is R2;

s2: punching tooth shoes from outside to inside along two side edges of a tooth body on the outer side of the tooth body in the crude product of the stator punching sheet respectively to reduce alpha after punching, reduce R1 and increase R2, and then inserting the stator punching sheet into a production line;

s3: and stamping the tooth shoe subjected to offline completion from inside to outside in the direction opposite to the tooth body, so that the alpha of the stamped tooth shoe is increased, R1 is increased, R2 is decreased, and the semi-closed sealing is completed.

2. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S2, the outer side edge of the punched tooth shoe and the outer side edge of the tooth body are in the same straight line.

3. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S3, the inner side edge of the punched tooth shoe and the bottom surface of the tooth body are on the same arc line.

4. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S2, a linear type punch is used for punching.

5. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S3, a sector punch is used for punching.

6. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S1, the width of the tooth shoe is W, and R/W is more than or equal to 2.

7. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S1, the length of the tooth shoe is L, the width of the tooth shoe is W, and W/L is less than or equal to 0.5.

8. The method for forming the semi-closed slot type stator punching sheet of the W-Pin winding motor as claimed in claim 1, wherein in step S1, the angle is more than 15 degrees and less than 75 degrees.

Technical Field

The invention relates to a winding stator motor, in particular to a method for forming a semi-closed slot type stator punching sheet of a W-Pin winding motor.

Background

In the practical application of new energy automobiles, with the higher and higher indexes of high power density and high torque density, the flat wire with the higher slot filling rate becomes the first choice in the design of the motor. The main offline winding forms of the flat wire motor comprise a Hairpin, an I-Pin, a W-Pin and the like, wherein the Hairpin and the I-Pin have the problems of large welding resistance at the end part and large size at the end part, so the winding form of the W-Pin is adopted more frequently.

However, in this form, because the W-Pin winding motor needs to meet the requirements of radial wire expansion and large-opening offline, the stator punching sheet generally has a large opening of the tooth slot, but the large tooth slot opening has a large influence on the motor performance, and the reliability of the overall structure is also reduced. If the small opening is designed during punching, the off-line requirement of the W-Pin winding motor cannot be met. If overlap earlier and make into big opening, roll off production line and accomplish through punching press tooth boots and seal to the tooth's socket after accomplishing, then can lead to the stress distribution of tooth boots comparatively concentrated, can cause the damage to the stator punching sheet equally, produce the influence to the motor performance.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a method for forming a semi-closed slot type stator punching sheet of a W-Pin winding motor, which can simultaneously meet the offline requirement of the W-Pin winding motor, has high structural reliability and uniform stress distribution.

The technical scheme is as follows: the invention relates to a method for forming a semi-closed slot type stator punching sheet of a W-Pin winding motor, which comprises the following steps:

s1: punching the blank to obtain a stator punching sheet crude product, wherein an included angle between the axis of the tooth shoe and the axis of the tooth body is alpha, the arc radius formed between the inner side edge of the tooth shoe and the bottom surface of the tooth body is R1, and the arc radius formed between the outer side edge of the tooth shoe and the side surface of the tooth body is R2;

s2: punching tooth shoes from outside to inside along two side edges of a tooth body on the outer side of the tooth body in the crude product of the stator punching sheet respectively to reduce alpha after punching, reduce R1 and increase R2, and then inserting the stator punching sheet into a production line;

s3: and stamping the tooth shoe subjected to offline completion from outside to inside in the direction opposite to the tooth body, so that the alpha of the stamped tooth shoe is increased, the R1 is increased, the R2 is decreased, and the semi-closed sealing is completed.

Therefore, after a crude product of the stator punching sheet is obtained, firstly, the tooth shoes are punched for the first time, so that the opening of a tooth socket formed between every two adjacent tooth shoes is enlarged, the coil is conveniently inserted, and after the coil is inserted, the tooth shoes are punched in the opposite direction, so that the tooth sockets are sealed in a semi-closed manner, the requirements of radial wire expansion and large opening of the W-Pin winding motor can be met, the stress distribution can be more uniform through the mode of punching for two times, the condition of stress concentration is effectively relieved, and the comprehensive damage of the stator punching sheet and the influence on the performance of the motor are reduced.

Preferably, in step S2, the outer side edge of the stamped tooth shoe and the outer side edge of the tooth body are aligned on the same straight line.

Preferably, in step S3, the inner side edge of the stamped tooth shoe and the bottom surface of the tooth body are on the same arc line, and in this process, as the tooth shoe of α increases, the stress of the tooth shoe decreases first and then increases, so that the stress distribution of the entire tooth shoe is uniform, and the stress concentration is relieved. Meanwhile, after the offline is finished, the opening of the tooth groove is the minimum at the moment, so that the influence of the stress of the tooth shoe on the performance of the motor is reduced.

Preferably, in step S2, a straight punch is used for punching, so that the punching efficiency of the tooth shoe can be improved and the continuously reduced state of alpha can be ensured.

Preferably, in step S3, a fan-shaped punch is used to punch, so that the tooth shoe can be deformed from inside to outside and a continuously increasing state is ensured.

Preferably, in step S1, R/W is 2 or more with the width of the tooth shoe as W.

Preferably, in step S1, the length of the tooth shoe is L, the width of the tooth shoe is W, and W/L is less than or equal to 0.5.

Preferably, in step S1, 15 ° < α < 75 °, the above design can reduce the stress concentration coefficient to improve the reliability of the overall structure.

Has the advantages that: compared with the prior art, the invention has the advantages that: while the requirements of radial wire expansion and large-opening wire inserting of the W-Pin winding motor are met, the stress distribution of the tooth shoe is more uniform, the condition of stress concentration is relieved, and the reliability of the whole structure is improved

Drawings

FIG. 1 is a schematic structural diagram of a stator lamination obtained by the present invention;

FIG. 2 is a schematic structural diagram of a tooth body in a crude stator punching sheet;

FIG. 3 is a schematic structural view of the tooth body after the end-of-line process is completed;

fig. 4 is a schematic structural view of the tooth body after completing the semi-closed type sealing.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

The invention relates to a method for forming a semi-closed slot type stator punching sheet of a W-Pin winding motor, which comprises the following steps:

s1: as shown in fig. 1, performing punching on a blank to obtain a stator punching sheet crude product, wherein an included angle between an axis of a tooth shoe and an axis of a tooth body is alpha, a circular arc radius formed between an inner side edge of the tooth shoe and a bottom surface of the tooth body is R1, a circular arc radius formed between an outer side edge of the tooth shoe and a side surface of the tooth body is R2, a width of the tooth shoe is W, and a length of the tooth shoe is L, wherein R/W is more than or equal to 2, W/L is less than or equal to 0.5, and alpha is more than 15 degrees and less than 75 degrees;

s2: as shown in fig. 2, on the outer side of the tooth body in the crude stator punching sheet, respectively punching the tooth shoe from outside to inside along the two side edges of the tooth body by using linear punches, so that the punched alpha is reduced, the R1 is reduced, the R2 is increased until the outer side edge of the tooth shoe and the outer side edge of the tooth body are on the same straight line, and at this time, alpha and R2 do not exist, and then the stator punching sheet is off-line;

s3: as shown in fig. 3, a fan-shaped punch is adopted from the direction opposite to the tooth body, the tooth shoe after the lower line is punched from inside to outside, so that the alpha of the punched tooth shoe is increased, the R1 is increased, the R2 is reduced, and the inner side edge of the tooth shoe and the bottom surface of the tooth body are on the same arc line, at the moment, the alpha is 90 degrees, R1 does not exist, and the semi-closed sealing is completed.

In step S1, the structural parameters of the tooth shoe are controlled, so that the stress concentration coefficient of the tooth shoe can be effectively reduced.

In step S2, when the outer side edge of the tooth shoe and the outer side edge of the tooth body are on the same straight line, the stress of the tooth shoe is minimum, and the opening of the tooth slot is completely opened at this time, so that the wire insertion of a worker can be facilitated, and the requirements of radial wire expansion and large opening wire insertion of the W-Pin winding motor are met. Then in S3, when the inner side edge of the tooth shoe is on the same arc line with the bottom surface of the tooth body, the tooth shoe carries out semi-closed sealing on the tooth groove again, and the opening is minimum, thereby reducing the influence of overlarge opening on the performance of the motor. On the other hand, in the process of deformation of the tooth boot, the strain of the tooth boot is gradually increased, so that the stress concentration condition of the tooth boot is relieved by two molding modes of firstly reducing and then increasing, the stress distribution is more uniform, and the reliability of the whole structure is improved.