A high efficiency magnetic circuit motor

Abstract

The utility model discloses a motor of high -efficient magnetic circuit, including rotor subassembly and stator subassembly, the stator subassembly includes stator core, and this stator core includes stator yoke, and the stator yoke inside alternately is provided with first stator tooth and second stator tooth according to same angle interval along the circumferential direction, and forms the winding slot between any two adjacent stator tooth, every winding slot is equipped with first side wall and second side wall respectively at the stator yoke, the length of first side wall is not equal with the length of second side wall, and first side wall extends to corresponding first stator tooth, and the first side wall of every first stator tooth both sides is arranged symmetrically, and second side wall extends to corresponding second stator tooth, and the second side wall of every second stator tooth both sides is arranged symmetrically, the main winding is wound on first stator tooth, and the sub -winding is wound on second stator tooth, and the line diameter of main winding and sub -winding is same. The utility model provides technical scheme through the asymmetric slot type design to make winding slot space utilization rate improve, and reduced magnetic circuit leakage magnetic loss simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor with a high-efficiency magnetic circuit. Background Technology

[0002] Motor operating efficiency is directly related to magnetic circuit design. The space utilization rate of the magnetic circuit, the uniformity of magnetic field distribution, and loss control are key factors that determine motor performance. In the existing technology, the winding slots (or "stator slots") of the motor stator core usually adopt a symmetrical slot structure, that is, the side wall length, slot width, and other specifications of the winding slots are uniform, and the stator teeth are evenly distributed along the circumferential direction and have the same specifications.

[0003] However, this traditional design has some shortcomings: On the one hand, the main winding carries the rated current and outputs operating power for a long time, while the auxiliary winding only provides the phase difference magnetic field during the startup phase. Therefore, the magnetomotive force requirements and working time of the main winding and the auxiliary winding are significantly different. The fixed space of the symmetrical slot type cannot accurately match the differentiated requirements of the two types of windings, resulting in low utilization of the slot space and the problem of "space redundancy" or "space insufficiency" in some areas, which indirectly increases the leakage magnetic loss of the magnetic circuit. On the other hand, in order to adapt to the space constraints of the symmetrical slot type, 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 uses thick wires. The difference in wire diameter means that different specifications of winding machines or frequent adjustments of equipment parameters are required during winding, which not only increases the cost of production equipment and the difficulty of process debugging, but also reduces production efficiency.

[0004] In view of the shortcomings of the existing technology, there is an urgent need for a high-efficiency magnetic circuit motor structure that can accurately match the different space requirements of the main winding and the auxiliary winding and simplify the assembly process. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a motor with a high-efficiency magnetic circuit, which aims to solve the technical problems of low utilization rate of winding slot space and high magnetic leakage loss caused by the symmetrical slot type of motor stator in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-efficiency magnetic circuit motor includes a rotor assembly and a stator assembly. The stator assembly includes a stator core, which includes a stator yoke. The stator yoke has first and second stator teeth alternately arranged at equal angular intervals along its circumferential direction. A winding slot is formed between any two adjacent stator teeth. 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, and the first sidewall extends to the corresponding first stator tooth. The first sidewalls on both sides of each first stator tooth are symmetrically arranged, and the second sidewall extends to the corresponding second stator tooth. The second sidewalls on both sides of each second stator tooth are symmetrically arranged. A main winding is wound on the first stator tooth, and a secondary winding is wound on the second stator tooth. The main winding and the secondary winding have the same wire diameter.

[0007] Furthermore, in the motor with the high-efficiency magnetic circuit, the angle between the first sidewall and the corresponding first stator tooth is 90°.

[0008] Furthermore, in the motor with the high-efficiency magnetic circuit, the stator yoke is rectangular, the first stator teeth are provided with 4 teeth and are respectively located in the middle of the four sides of the stator yoke, and the second stator teeth are provided with 4 teeth and are respectively located at the four corners of the stator yoke.

[0009] Furthermore, in the motor with the high-efficiency magnetic circuit, each of the first stator teeth and the second stator teeth has a shoe portion at its inward-facing end. The inner surface of the shoe portion is an arc surface, and the inner surfaces of all shoe portions are located on the same circumference.

[0010] Furthermore, in the motor with the high-efficiency magnetic circuit, the rotor assembly includes a rotating shaft and a rotor chip body, and the outer circle of the rotor chip body and the inner circle of the stator tooth shoe in the stator assembly are uniformly arranged in the air gap along the circumferential direction.

[0011] Furthermore, in the motor with the high-efficiency magnetic circuit, a front wire frame is provided at the front end of the stator core, and a rear wire frame is provided at the rear end of the stator core; the front wire frame includes an annular first wire frame body, on which multiple first support arms are provided, and a first wire slot cavity corresponding to the winding slot is formed between two adjacent first support arms; the rear wire frame includes an annular second wire frame body, on which multiple second support arms are provided, and a second wire slot cavity corresponding to the winding slot is formed between two adjacent second support arms.

[0012] Furthermore, in the motor of the high-efficiency magnetic circuit, each end of the second support arm is connected to a limiting tooth, and each limiting tooth is provided with a limiting groove communicating with the second wire slot cavity at the corresponding second wire slot cavity; each winding slot is provided with slot paper, and the rear end of the slot paper is inserted into the limiting groove.

[0013] Furthermore, in the motor of the high-efficiency magnetic circuit, the second wire frame body is provided with an annular sidewall, and the second wire frame body is provided with a plurality of limiting blocks on the radially inner side of the annular sidewall. The limiting blocks are located on the axially outer side of the second wire frame body, and a limiting space for constraining the cross-slot enameled wire of the main winding and the cross-slot enameled wire of the secondary winding is formed between the limiting blocks and the annular sidewall.

[0014] Beneficial effects: This utility model provides a motor with a high-efficiency magnetic circuit, which has at least the following advantages compared with the prior art: (1) The asymmetric winding slot design is adopted, with the first sidewall and the second sidewall having different lengths, which can better adapt to the different space requirements of the main winding and the auxiliary winding, avoid the problem of low space utilization of traditional symmetric slot type, reduce leakage magnetic loss, and improve magnetic energy conversion efficiency.

[0015] (2) The uniform wire diameter of the main and auxiliary windings makes the wire arrangement more regular during winding, further reducing magnetic leakage in the magnetic circuit gap and improving the magnetic energy conversion efficiency. In addition, the uniform wire diameter of the main and auxiliary windings can be completed on the same winding equipment without changing equipment or adjusting parameters, simplifying the process. Attached Figure Description

[0016] Figure 1 A perspective view of the motor with the high-efficiency magnetic circuit provided by this utility model.

[0017] Figure 2 This is a three-dimensional diagram of the front winding frame, stator core, rear winding frame, main winding, and auxiliary winding.

[0018] Figure 3 This is a three-dimensional view of the stator core.

[0019] Figure 4 This is the front view of the stator core.

[0020] Figure 5 This is a 3D view of the front-line frame.

[0021] Figure 6 This is a 3D view of the rear cable tray.

[0022] Figure 7 for Figure 6 A magnified view of part A in the middle.

[0023] Figure 8 This is a 3D view of the rear wire frame and slotted paper.

[0024] Explanation of reference numerals in the attached figures: 11. Front bracket; 12. Rear bracket; 13. PCB board; 21. Shaft; 3. Stator core; 31. Stator yoke; 310. Winding slot; 321. First stator tooth; 322. Second stator tooth; 3211. Centerline of the first stator tooth; 3221. Centerline of the second stator tooth; 33. Boot part; 341. First sidewall; 342. Second sidewall; 4. Front frame; 41. First frame body; 42. First support arm; 410. First cable tray cavity; 5. Rear wire frame; 51. Second wire frame body; 511. Annular side wall; 52. Second support arm; 510. Second wire groove cavity; 53. Limiting tooth; 530. Limiting groove; 54. Limiting block; 540. Limiting space; 59. Groove paper; 61. Main winding; 62. Secondary winding; L1, the length of the first sidewall; L2, the length of the second sidewall. Detailed Implementation

[0025] 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.

[0026] Please see Figures 1 to 8 This utility model provides a motor with a high-efficiency magnetic circuit. 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 (such as the specific structure of the rotor assembly) are not specifically shown. The terms "first," "second," etc., used herein are merely different names for similar structures for ease of explanation and are not intended to limit this application or indicate the priority of similar structures. For ease of explanation, some directional terms are unavoidably used herein, but these directional terms are not intended to limit this application. The term "axial inner side" refers to the direction along the axial direction towards the interior of the motor. The term "axial outer side" refers to the direction along the axial direction away from the interior of the motor.

[0027] The term "multiple" as used in this article refers to a quantity of 2 or more. Since the quantity of the structures referred to is not an inventive point, it is not specifically limited.

[0028] Please refer to the following first. Figures 1 to 4The high-efficiency magnetic circuit motor includes a rotor assembly and a stator assembly. The stator assembly includes a stator core 3, which includes a stator yoke 31. The stator yoke has first stator teeth 321 and second stator teeth 322 alternately arranged at the same angular intervals along the circumferential direction. A winding slot 310 is formed between any two adjacent stator teeth. Each winding slot has a first sidewall 341 and a second sidewall 342 corresponding to the stator yoke. The length L1 of the first sidewall and the length L2 of the second sidewall are not equal. The first sidewall 341 extends to the corresponding first stator tooth 321. The first sidewalls on both sides of each first stator tooth are symmetrically arranged. The second sidewall 342 extends to the corresponding second stator tooth 322. The second sidewalls on both sides of each second stator tooth are symmetrically arranged. A main winding 61 is wound on the first stator tooth 321, and an auxiliary winding 62 is wound on the second stator tooth 322. The main winding and the auxiliary winding have the same wire diameter.

[0029] From the appendix Figure 4 It can be observed that the first sidewall 341 and the second sidewall 342 in each winding slot are connected to form a V-shape. The first sidewall 341 on both sides of each first stator tooth is symmetrically arranged with respect to the center line 3211 of the corresponding first stator tooth. This arrangement allows the main winding to be wound normally on the first stator tooth. The second sidewall 342 on both sides of each second stator tooth is symmetrically arranged with respect to the center line 3221 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 lies in the fact 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 unequal, which can adapt to the different space requirements of the main winding and the auxiliary winding. This not only improves the utilization rate of the winding slots, but also reduces leakage magnetic loss caused by space mismatch, thereby improving magnetic conduction efficiency. In addition, the main winding and the auxiliary winding each have suitable space, and the wire diameter of the main and auxiliary windings is uniform, so they can be wound on the same winding machine. This not only simplifies the process and avoids uneven wire gaps caused by differences in wire diameter, but also further reduces "gap leakage" in the magnetic circuit and further improves magnetic conduction efficiency.

[0030] In existing technologies, the main winding of some motors occupies more space than the auxiliary winding. Therefore, the length of the first sidewall can be designed to be greater than the length of the second sidewall, allowing more space to be allocated to the main winding slots. Furthermore, in special scenarios such as heavy-load starting and low-voltage operation, designs with larger auxiliary winding space and more turns are sometimes used. In this case, the length of the first sidewall is designed to be less than the length of the second sidewall. The first sidewall corresponds to the main winding, and the second sidewall corresponds to the auxiliary winding; a longer second sidewall allows for more space in the auxiliary winding slots. With this configuration, each asymmetrical winding slot allocates more space to the second stator tooth, and the auxiliary winding wire diameter is the same as the main winding, with more turns. Because the auxiliary winding can have more turns, its total magnetomotive force (number of turns × current) can meet the starting requirements through a reasonable match between a smaller current and a larger number of turns, without relying on thicker wires to increase current carrying capacity.

[0031] The angle between the first sidewall 341 and the corresponding first stator tooth 321 is 90°. This arrangement allows the main winding conductors (usually enameled wire) to be neatly arranged in a direction perpendicular to the stator teeth during winding, resulting in higher conductor fit, smaller gaps, and reduced magnetic leakage paths between conductors.

[0032] The stator yoke 31 described above can be made into a ring, rectangle, or other shapes. In practical applications, as a preferred design, the stator yoke 31 is rectangular. Four first stator teeth 321 are provided, each located in the middle of one of the four sides of the stator yoke. Four second stator teeth 322 are provided, each located at one of the four corners of the stator yoke. This arrangement not only facilitates the processing of the stator core but also facilitates the positioning and assembly of the motor with the corresponding equipment. Furthermore, since the main winding carries the rated current for extended periods and requires a stable magnetomotive force output, its placement in the middle of the four sides reduces the conduction loss of the main winding's magnetic circuit and improves energy conversion efficiency. The auxiliary winding only operates during the startup phase; even if the magnetic reluctance at the corners is slightly higher, it will not affect the overall operating efficiency of the motor. The corner space provides an independent installation area for the auxiliary winding, avoiding interference with the main winding's magnetic circuit. The four first stator teeth and four second stator teeth are evenly distributed alternately along the circumference (at 45° intervals), resulting in a more balanced alternation of magnetic field polarity in the circumferential direction.

[0033] Furthermore, each of the first and second stator teeth has a boot portion 33 at its inward-facing end. The inner surface of the boot portion is an arc surface, as shown in the main view of the stator core (e.g., Figure 4 As shown, the inner surfaces of all boot parts lie on the same circumference.

[0034] Furthermore, the rotor assembly includes a rotating shaft 21 and a rotor chip body (not shown in the figure). The outer circle of the rotor chip body and the inner circle of the stator tooth shoe in the stator assembly are uniformly arranged in the circumferential air gap. Since the inner surfaces of all the shoe parts are circular, it can be ensured that the air gap reference between each stator tooth and the rotor is consistent, avoiding local air gap abnormalities caused by shoe part position deviations and maintaining efficient magnetic circuit conduction.

[0035] Please see Figure 2 , Figure 5 and Figure 6 In practical applications, to facilitate the winding of the windings, it is usually placed at the front end of the stator core 3 ( Figure 1 and Figure 2 (View from the left) An insulated front frame 4 is installed at the rear end of the stator core ( Figure 1 and Figure 2 (View from the right) An insulated rear wire frame 5 is provided. The front wire frame 4 includes a ring-shaped first wire frame body 41, on which multiple first support arms 42 are provided. A first wire slot cavity 410 corresponding to a winding slot is formed between two adjacent first support arms. The rear wire frame 5 includes a ring-shaped second wire frame body 51, on which multiple second support arms 52 are provided. A second wire slot cavity 510 corresponding to a winding slot is formed between two adjacent second support arms. The first wire slot cavities on the front wire frame, the winding slots on the stator core, and the second wire slot cavities on the rear wire frame have the same shape (i.e., all are asymmetrical slot types) and correspond one-to-one, which facilitates the winding of the windings.

[0036] Please see Figure 8 Furthermore, each end of the second support arm 52 is connected to a limiting tooth 53, and each limiting tooth 53 has a limiting groove 530 corresponding to the second wire slot cavity 510, communicating with the second wire slot cavity; each winding slot is provided with slot paper 59, the rear end of the slot paper is inserted into the limiting groove. Since setting slot paper in the winding slot is prior art, the accompanying drawings do not specifically show how the slot paper is set in the winding slot, and Figure 8 The drawing only schematically depicts a grooved paper (in reality...) Figure 8 The structure shown contains a total of 8 slots. The main function of slot 59 is to isolate the winding from the stator core, preventing direct contact between the two and thus avoiding damage to the insulation of the winding conductors. The slots are fixed by limiting slots to prevent displacement of the slots, maintain the normal insulation environment of the magnetic circuit, and avoid magnetic losses caused by slot displacement.

[0037] In practical applications, the windings of the same phase in a distributed winding are continuously wound in multiple winding slots. For the section of enameled wire of the same phase between one winding slot and another (i.e., the cross-slot enameled wire), existing winding support frames lack corresponding limiting structures, making it impossible to effectively limit its movement. During motor operation, this can easily lead to displacement and loosening of the cross-slot enameled wire, potentially damaging the insulation layer and causing a short circuit risk. It can also alter the winding magnetic field distribution, affecting the motor's output torque and operational stability. To address this, this invention further improves upon the following: Please refer to... Figure 6 and Figure 7 The second wire frame body 51 is provided with an annular sidewall 511, and a plurality of limiting blocks 54 are provided on the radially inner side of the second wire frame body corresponding to the annular sidewall. The limiting blocks 54 are located on the axially outer side of the second wire frame body. Figure 6 (View from the upward side), and a limiting space 540 is formed between the limiting block 54 and the annular sidewall 511 to constrain the cross-slot enameled wire of the main winding and the cross-slot enameled wire of the auxiliary winding. When the distributed winding is being wound, the cross-slot enameled wire (not shown in the figure) drawn from one winding slot of the same phase winding can pass through the limiting space formed between the corresponding limiting block and the annular sidewall, thereby achieving a radial limiting effect on the cross-slot enameled wire. This ensures that the radial displacement of the cross-slot enameled wire is within a controllable range under normal motor operation, preventing wear or large displacement of the enameled wire.

[0038] For ease of understanding, the accompanying drawings illustrate one specific form of a motor with an efficient magnetic circuit. However, in practical applications, various forms are possible. Although the drawings also show structures such as the rotating shaft 21, front bracket 11, rear bracket 12, and PCB board 13, these structures are not the innovation of this application and are not within the scope of protection of this utility model. Therefore, this document will not provide specific explanations or limitations for these structures.

[0039] 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 high-efficiency magnetic circuit motor, comprising a rotor assembly and a stator assembly, characterized in that: The stator assembly includes a stator core, which includes a stator yoke. The stator yoke has first and second stator teeth alternately arranged at equal angular intervals along its circumference. A winding slot is formed between any two adjacent stator teeth. 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, and the first sidewall extends to the corresponding first stator tooth. The first sidewalls on both sides of each first stator tooth are symmetrically arranged, and the second sidewall extends to the corresponding second stator tooth. The second sidewalls on both sides of each second stator tooth are symmetrically arranged. A main winding is wound on the first stator tooth, and a secondary winding is wound on the second stator tooth. The main winding and the secondary winding have the same wire diameter.

2. The motor with a high-efficiency magnetic circuit according to claim 1, characterized in that: The angle between the first sidewall and the corresponding first stator tooth is 90°.

3. The motor with a high-efficiency magnetic circuit according to claim 1, characterized in that: The stator yoke is rectangular. The first stator tooth has four teeth, which are located in the middle of the four sides of the stator yoke. The second stator tooth has four teeth, which are located at the four corners of the stator yoke.

4. The motor with a high-efficiency magnetic circuit according to claim 1, characterized in that: Each of the first stator teeth and the second stator teeth has a boot section at its inward-facing end. The inner surface of the boot section is an arc surface, and the inner surfaces of all boot sections are located on the same circumference.

5. The motor with a high-efficiency magnetic circuit according to claim 4, characterized in that: The rotor assembly includes a rotating shaft and a rotor chip body. The outer circle of the rotor chip body and the inner circle of the stator tooth shoe in the stator assembly are uniformly arranged in the circumferential air gap.

6. The motor with a high-efficiency magnetic circuit according to claim 1, characterized in that: The stator core has a front wire frame at the front end and a rear wire frame at the rear end. The front wire frame includes a ring-shaped first wire frame body with multiple first support arms on it. A first wire slot cavity corresponding to a winding slot is formed between two adjacent first support arms. The rear wire frame includes a ring-shaped second wire frame body with multiple second support arms on it. A second wire slot cavity corresponding to a winding slot is formed between two adjacent second support arms.

7. The motor with a high-efficiency magnetic circuit according to claim 6, characterized in that: Each end of the second support arm is connected to a limiting tooth, and each limiting tooth has a limiting groove that communicates with the second wire slot cavity at the corresponding second wire slot cavity; each winding slot is provided with slot paper, and the rear end of the slot paper is inserted into the limiting groove.

8. The motor with a high-efficiency magnetic circuit according to claim 6, characterized in that: The second wire frame body is provided with an annular sidewall. The second wire frame body is provided with a plurality of limiting blocks on the radial inner side of the annular sidewall. The limiting blocks are located on the axial outer side of the second wire frame body, and a limiting space is formed between the limiting blocks and the annular sidewall for constraining the main winding slot enameled wire and the secondary winding slot enameled wire.

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