Motor stator core facilitating winding assembly

Abstract

The utility model discloses a motor stator core convenient to winding assembly, including stator yoke, the first stator tooth and the second stator tooth of inside stator yoke are alternately set up according to the same angle interval along the circumferential direction, and each winding slot is provided with first side wall and second side wall respectively at the stator yoke, and the length of first side wall and the length of second side wall are not equal, every first side wall extends to corresponding first stator tooth, and the first side wall of every first stator tooth two sides is symmetrically set up, every second side wall extends to corresponding second stator tooth, and the second side wall of every second stator tooth two sides is symmetrically set up, the technical scheme provided by the utility model can allocate the space in the slot according to the actual space demand of main and deputy winding flexibly, and the space utilization ratio is improved significantly. In addition, the asymmetric slot type creates conditions for adapting main and deputy winding line diameter uniformity, and main and deputy winding can select same line diameter conductor, and can complete two kinds of winding winding on the same winding machine.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor stator core that facilitates winding assembly. Background Technology

[0002] The stator core of a motor is one of its core components, and its structural design directly affects the motor's performance, winding assembly process, and production costs. For example... Figure 1 As shown, the mainstream motor stator cores 1' in the industry generally adopt a symmetrical slot structure, that is, the winding slots 10' evenly distributed along the circumference of the stator yoke have completely identical specifications (slot width, slot depth, and sidewall angle are all the same), and the corresponding stator teeth have the same specifications and are evenly distributed along the circumference. This type of structure has certain convenience in the initial design and processing of motor stator cores, but in practical applications, due to the functional differences between the main winding and the auxiliary winding, it has the following shortcomings: (1) Low slot space utilization. The fixed specifications of symmetrical slots cannot match the different space requirements of the main and auxiliary windings. In practical applications, the space required by the main and auxiliary windings is not the same, which means that the space utilization of some winding slots is low.

[0003] (2) The winding assembly process is complex and costly. The main winding of a single-phase motor needs to carry the rated current for a long time to output operating power, while the auxiliary winding only provides the phase difference magnetic field during the starting stage. The current load and number of turns requirements of the two are fundamentally different. In the traditional symmetrical slot design, in order to adapt to this difference, the main winding and the auxiliary winding usually need to use wires of different diameters. The main winding usually uses thin wires, while the auxiliary winding needs to use thick wires. The difference in wire diameter means that different specifications of winding machines are required during winding, or the winding mold and tension parameters need to be changed frequently. This not only increases the cost of equipment purchase and maintenance, but also prolongs the process debugging time and reduces production efficiency.

[0004] In view of the above technical problems, this utility model proposes a motor stator core structure that can adapt to the differentiated needs of the main and auxiliary windings, simplify the assembly process and improve space utilization. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a motor stator core that is easy to assemble with windings, and to solve the technical problems of low utilization of motor stator core slot space and complex winding assembly process in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A motor stator core for easy winding assembly includes a stator yoke. The stator yoke has multiple stator teeth spaced at equal angles along its circumference. A winding slot is formed between any two adjacent stator teeth. The stator teeth include alternating first and second stator teeth. The first stator teeth are used for winding the main winding, and the second stator teeth are used for winding the auxiliary winding. Each winding slot has a first sidewall and a second sidewall corresponding to the stator yoke. The lengths of the first and second sidewalls are unequal. Each first sidewall extends to its corresponding first stator tooth, and the first sidewalls on both sides of each first stator tooth are symmetrically arranged. Each second sidewall extends to its corresponding second stator tooth, and the second sidewalls on both sides of each second stator tooth are symmetrically arranged.

[0007] Furthermore, in the motor stator core that facilitates winding assembly, the length of the first sidewall is less than the length of the second sidewall.

[0008] Furthermore, in the motor stator core that facilitates winding assembly, the stator yoke is rectangular and has a total of 4 first stator teeth and 4 second stator teeth; each first stator tooth is located at the middle of the four sides of the stator yoke, and each second stator tooth is located at the four corners of the stator yoke.

[0009] Furthermore, in the motor stator core that facilitates winding assembly, each first sidewall is a plane and each second sidewall is a plane.

[0010] Furthermore, in the motor stator core that facilitates winding assembly, the included angle between each first sidewall and the corresponding first stator tooth is 90°.

[0011] Furthermore, in the motor stator core that facilitates winding assembly, a mounting hole is provided at each of the four corners of the stator yoke.

[0012] Furthermore, in the motor stator core that facilitates winding assembly, the width of each stator tooth is equal.

[0013] Furthermore, in the motor stator core that facilitates winding assembly, each stator tooth has an inward-facing end with a shoe portion, and the inner surface of each shoe portion is an arc surface.

[0014] Beneficial effects: This utility model provides a motor stator core that facilitates winding assembly, and compared with the prior art, it has at least the following advantages: (1) This utility model alternates the stator teeth to the first stator teeth (for winding the main winding) and the second stator teeth (for winding the auxiliary winding), and makes the lengths of the first sidewall and the second sidewall of the winding slot unequal, forming an asymmetrical slot shape. The slot space can be flexibly allocated according to the actual space requirements of the main and auxiliary windings, solving the problem of slot space waste, and allowing each part of the space to match the functional requirements of the winding, thus significantly improving the space utilization rate.

[0015] (2) The symmetrical slot design of the stator core of traditional motors requires the use of different wire diameters due to the differences in current load and number of turns of the main and auxiliary windings. This results in frequent changes of winding machines and molds or adjustments of tension parameters during winding, increasing equipment costs and debugging time. This utility model creates conditions for adapting the wire diameter of the main and auxiliary windings to be uniform through the asymmetrical slot design. The main and auxiliary windings can use the same wire diameter, and the functional requirements can be met by adjusting the number of turns. The two types of windings can be completed on the same winding machine without changing the winding equipment. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of the stator core of a motor in the prior art.

[0017] Figure 2 A perspective view of a motor stator core that facilitates winding assembly, provided by this utility model.

[0018] Figure 3 The front view of the motor stator core provided by this utility model for easy winding assembly.

[0019] Figure 4 This is a front view of the motor stator core that facilitates winding assembly according to the present invention. The main winding and auxiliary winding are shown in the figure.

[0020] Explanation of reference numerals in the attached figures: 1', The stator core of a motor in the prior art; 10', The winding slot in the prior art; 1. Stator yoke; 10. Winding slots; 21. First stator tooth; 22. Second stator tooth; 211. Center line of the first stator tooth; 221. Center line of the second stator tooth; 3. Boot section; 41. First sidewall; 42. Second sidewall; 50. Mounting holes; 61. Main winding; 62. Secondary winding; L1, the length of the first sidewall; L2, the length of the second sidewall. Detailed Implementation

[0021] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model is further described in detail below. It should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0022] Please see Figures 2 to 4This utility model provides a motor stator core that facilitates winding assembly. The accompanying drawings are for illustrative purposes only and are not proportional to actual products. The drawings only depict structures relevant to the innovation of this application; some conventional structures are not shown in detail. For ease of understanding, Figure 4 The main winding and the auxiliary winding are schematically shown, but the main winding and the auxiliary winding themselves are not within the protection scope of this utility model.

[0023] The terms "first," "second," etc., used herein are merely different names for similar structures to facilitate explanation and are not intended to limit this application, nor do they indicate the priority of similar structures. For ease of explanation, this document inevitably uses some locative terms, but these locative terms are not intended to limit this application. The term "multiple" in this document refers to a quantity of two or more.

[0024] The motor stator core, which facilitates winding assembly, includes a stator yoke 1. Multiple stator teeth are spaced at equal angles along the circumferential direction inside the stator yoke. A winding slot 10 is formed between any two adjacent stator teeth. The stator teeth include alternating first stator teeth 21 and second stator teeth 22. The first stator teeth 21 are used to wind the main winding 61, and the second stator teeth 22 are used to wind the auxiliary winding 62. Each winding slot has a first sidewall 41 and a second sidewall 42 corresponding to the stator yoke. The lengths L1 and L2 of the first and second sidewalls are unequal. Each first sidewall 41 extends to the corresponding first stator tooth 21, and the first sidewalls 41 on both sides of each first stator tooth are symmetrically arranged. Each second sidewall extends to the corresponding second stator tooth 22, and the second sidewalls 42 on both sides of each second stator tooth are symmetrically arranged.

[0025] From the appendix Figure 3 It can be observed that the first sidewall 41 and the second sidewall 42 in each winding slot are connected to form a V-shape. The first sidewall 41 on both sides of each first stator tooth is symmetrically arranged with respect to the center line 211 of the corresponding first stator tooth. This arrangement allows the main winding 61 to be wound normally on the first stator tooth 41. The second sidewall 42 on both sides of each second stator tooth is symmetrically arranged with respect to the center line 221 of the corresponding second stator tooth. This arrangement allows the auxiliary winding to be wound normally on the second stator tooth. The innovation of this application is that the lengths of the first sidewall and the second sidewall are not equal, making each winding slot an asymmetrical winding slot. This arrangement makes the space occupied by the main winding and the auxiliary winding not equal, which can adapt to the different space requirements of the main winding and the auxiliary winding, and improve the utilization rate of the winding slots. In addition, the main winding and the auxiliary winding each have suitable space, so that the wire diameters of the main winding and the auxiliary winding can be set to the same size, so that the winding of the main winding and the auxiliary winding can be completed on the same winding machine, simplifying the process and improving the winding efficiency.

[0026] In the prior art, the main winding of some motors occupies more space than the auxiliary winding. Accordingly, the length of the first sidewall can be designed to be greater than the length of the second sidewall, so that the winding slots can allocate more space to the main winding.

[0027] Furthermore, in special scenarios such as heavy-load startup and low-voltage operation, designs with larger secondary winding space and more turns are sometimes used. In these cases, the length of the first sidewall is correspondingly shorter than the length of the second sidewall. The first sidewall corresponds to the main winding, and the second sidewall corresponds to the secondary winding; a longer second sidewall allows for more space in the secondary winding's side slots. This configuration allocates more space to the second stator teeth for each asymmetrical winding slot, allowing the secondary winding to have the same wire diameter as the main winding and more turns. Because the secondary winding can have more turns, its total magnetomotive force (turns × current) can meet the startup requirements through a combination of "small current × many turns," without relying on thicker wires to increase current carrying capacity. Therefore, the secondary and main windings can be set to have the same small wire diameter, allowing both the main and secondary windings to be wound on the same winding machine.

[0028] Furthermore, the stator yoke is rectangular, with a total of four first stator teeth 21 and four second stator teeth 22. That is, adjacent stator teeth are spaced 45° apart. Each first stator tooth is located at the middle of one of the four sides of the stator yoke, and each second stator tooth is located at one of the four corners of the stator yoke. This arrangement makes the magnetic path in the middle of the four sides shorter and the magnetic resistance lower, which is suitable for the magnetic path requirements of the main winding during long-term operation and improves operating efficiency; while the magnetic path at the corners is slightly longer, the auxiliary winding only starts for a short time, so it does not affect the performance.

[0029] like Figure 2 As shown, each first sidewall 41 is a plane, and each second sidewall 42 is a plane. This arrangement allows for a higher degree of fit between the winding and the motor stator core, avoiding gaps between the winding and the core caused by irregular sidewall shapes.

[0030] like Figure 3 As shown, furthermore, the angle between each first sidewall 41 and the corresponding first stator tooth 21 is 90°. This arrangement allows the main winding wires to be neatly arranged in the vertical direction during winding, resulting in high wire fit and no tilting or offset. Furthermore, a mounting hole 50 is provided at each of the four corners of the stator yoke. During actual assembly, bolts (not shown in the figure) can be passed through each mounting hole to connect the stator core to the front and rear brackets (not shown in the figure) of the motor.

[0031] Furthermore, the width of each stator tooth (including the first and second stator teeth) is equal. Equal width of all stator teeth means that the winding "reference space" is consistent across all teeth. For designs where the main and auxiliary windings have the same wire diameter, equal tooth width allows for the commonality of conductor tension and winding trajectory parameters on the winding machine, eliminating the need to adjust equipment parameters due to tooth width differences and reducing process complexity. Simultaneously, a uniform tooth width ensures consistent fixing strength of the winding at the teeth, preventing winding loosening due to excessively narrow teeth on one side.

[0032] Furthermore, each stator tooth (including the first and second stator teeth) has a shoe portion 3 at its inward-facing end, and the inner surface of each shoe portion is arc-shaped. From the perspective of the front view, the inner surface of each shoe portion lies on the same circle. The arc-shaped structure of the inner surface of the shoe portion better matches the arc-shaped contour of the rotor's outer circle, resulting in a more uniform distribution of air gap magnetic flux density and reducing air gap reluctance loss.

[0033] In practical applications, the stator yoke is usually formed by stacking high silicon steel sheets. Since this is a standard setting, it will only be briefly explained here.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. It is understood that those skilled in the art can make equivalent substitutions or modifications based on the technical solution and inventive concept of the present utility model, and all such modifications or substitutions should fall within the protection scope of the present utility model.

Claims

1. A motor stator core for easy winding assembly, comprising a stator yoke, wherein multiple stator teeth are arranged at equal angular intervals along the circumferential direction inside the stator yoke, and a winding slot is formed between any two adjacent stator teeth, characterized in that: The stator teeth include alternating first stator teeth and second stator teeth. The first stator teeth are used to wind the main winding, and the second stator teeth are used to wind the auxiliary winding. Each winding slot has a first sidewall and a second sidewall corresponding to the stator yoke. The lengths of the first sidewall and the second sidewall are not equal. Each first sidewall extends to the corresponding first stator tooth, and the first sidewalls on both sides of each first stator tooth are symmetrically arranged. Each second sidewall extends to the corresponding second stator tooth, and the second sidewalls on both sides of each second stator tooth are symmetrically arranged.

2. The motor stator core for easy winding assembly according to claim 1, characterized in that: The length of the first sidewall is less than the length of the second sidewall.

3. The motor stator core for easy winding assembly according to claim 1, characterized in that: The stator yoke is rectangular and has four first stator teeth and four second stator teeth. Each first stator tooth is located at the middle of the four sides of the stator yoke, and each second stator tooth is located at the four corners of the stator yoke.

4. The motor stator core for easy winding assembly according to claim 3, characterized in that: Each first sidewall is a plane, and each second sidewall is a plane.

5. The motor stator core for easy winding assembly according to claim 4, characterized in that: The angle between each first sidewall and the corresponding first stator tooth is 90°.

6. The motor stator core for easy winding assembly according to claim 3, characterized in that: The stator yoke has a mounting hole at each of its four corners.

7. The motor stator core for easy winding assembly according to any one of claims 1-6, characterized in that: Each stator tooth has the same width.

8. The motor stator core for easy winding assembly according to claim 7, characterized in that: Each stator tooth has a boot section on its inward-facing end, and the inner surface of each boot section is curved.

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