Motor assembly and motor

Abstract

The application provides an electric machine assembly and an electric machine. The electric machine assembly comprises a stator, which comprises a winding and a stator tooth group, the stator tooth group is provided with a plurality of stator teeth and is uniformly arranged along the circumference of the stator; the stator tooth group is composed of a first tooth, a second tooth and a third tooth which are sequentially arranged along the circumference of the stator; the first tooth and the third tooth are symmetrically arranged with the center line of the second tooth as the symmetry center, and the width of the second tooth is smaller than the width of the first tooth or the third tooth; only the first tooth and the third tooth in the stator tooth group are wound with the winding. By adjusting the different stator tooth widths and the positions of the teeth, the slot space occupied by each phase winding of the electric machine can be increased, the magnetic density of each tooth part is ensured not to be oversaturated, the amplitude of the unbalanced electromagnetic force is greatly reduced, the electromagnetic vibration and noise are reduced, the copper loss is effectively reduced, the efficiency is improved, and the electromagnetic force is reduced.

Description

Technical Field

[0001] This application belongs to the field of motor technology, specifically relating to a motor assembly and a motor. Background Technology

[0002] For electric motors, the market generally demands high efficiency and low electromagnetic noise, while also trending towards miniaturization to meet energy efficiency requirements. Traditional nine-slot eight-pole permanent magnet motors, due to their high winding coefficient, have high motor efficiency, but their inherent structural imbalances result in significant electromagnetic forces and prominent electromagnetic noise issues, making them unsuitable for use in compressor applications. Summary of the Invention

[0003] Therefore, this application provides a motor assembly and a motor that can solve the problem of large unbalanced electromagnetic force and prominent electromagnetic noise in the prior art due to the structure of the 9-slot 8-pole permanent magnet motor.

[0004] To address the aforementioned problems, this application provides a motor assembly, comprising:

[0005] The stator includes a winding and a stator tooth assembly, wherein multiple stator tooth assemblies are provided and are evenly arranged along the circumference of the stator; the stator tooth assembly is composed of a first tooth, a second tooth and a third tooth arranged sequentially along the circumference of the stator.

[0006] The first tooth and the third tooth are symmetrically arranged with respect to the center line of the second tooth, and the width of the second tooth is smaller than the width of the first tooth or the third tooth.

[0007] The stator tooth group has the winding wound only on the first tooth and the third tooth.

[0008] Optionally, the tooth groove width between adjacent stator tooth groups is greater than the tooth groove width between the second tooth and the first or third tooth.

[0009] Optionally, the included angle between adjacent stator tooth groups is de2, and the included angle of the stator tooth groups is de1, satisfying 0.5≤de1 / de2≤1.22.

[0010] Optionally, the width of the second tooth is bt2, and the width of the first tooth or the third tooth is bt1, satisfying bt2≤0.28bt1.

[0011] Optionally, the motor assembly further includes a rotor disposed within the stator, wherein the difference between the inner diameter of the stator and the outer diameter of the rotor is g, satisfying 1.5g≤bt2.

[0012] Optionally, the rotor has eight magnetic poles evenly distributed on its outer periphery.

[0013] Optionally, the first tooth or the third tooth includes a first boot portion, the width of the first side of the first boot portion is eb1, the width of the second side is eb2, and the width satisfies 2eb2≤eb1≤3.2mm; the second side is the side closer to the second tooth.

[0014] Optionally, the second tooth has a symmetrical structure, including a second boot part, the width of which is eb3, satisfying eb3 = eb2.

[0015] According to another aspect of this application, an electric motor is provided, including the motor assembly described above.

[0016] Optionally, the motor includes a three-phase motor, which includes a U-phase winding, a V-phase winding, and a W-phase winding. The U-phase winding, V-phase winding, and W-phase winding are sequentially and cyclically wound on the first tooth and the third tooth, which are cyclically arranged along the circumference of the stator.

[0017] This application provides a motor assembly, comprising: a stator, including windings and stator teeth, wherein multiple stator teeth are provided and uniformly arranged along the circumference of the stator; the stator teeth are composed of a first tooth, a second tooth, and a third tooth arranged sequentially along the circumference of the stator; the first tooth and the third tooth are symmetrically arranged with respect to the center line of the second tooth, and the width of the second tooth is smaller than the width of the first tooth or the third tooth; the windings are wound on only the first tooth and the third tooth in the stator teeth assembly.

[0018] By adjusting different stator tooth widths and tooth positions, the slot space occupied by each phase winding of the motor can be increased, while ensuring that the magnetic flux density of each tooth does not become oversaturated. This greatly reduces the amplitude of unbalanced electromagnetic force, reduces electromagnetic vibration and noise, effectively reduces copper loss, improves efficiency, and lowers electromagnetic force. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the motor according to an embodiment of this application;

[0020] Figure 2 Examples of this application Figure 1 A magnified view of a portion of the stator gear assembly;

[0021] Figure 3 This is a schematic diagram of the winding arrangement in the motor according to an embodiment of this application;

[0022] Figure 4 This is a state diagram of the electromagnetic force of a traditional nine-slot eight-pole motor.

[0023] Figure 5 This is a state diagram of the electromagnetic force of the nine-slot eight-pole motor in Embodiment 9 of this application.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Stator; 11. First tooth; 111. Shoe part; 12. Second tooth; 13. Third tooth; 2. Rotor; 3. Permanent magnet; 4. Winding. Detailed Implementation

[0026] See also Figures 1 to 5 As shown, according to an embodiment of this application, a motor assembly includes:

[0027] The stator 1 includes a winding and a stator tooth assembly. The stator tooth assembly is provided in multiple ways and is evenly arranged along the circumference of the stator 1. The stator tooth assembly is composed of a first tooth 11, a second tooth 12 and a third tooth 13 arranged sequentially along the circumference of the stator 1.

[0028] The first tooth 11 and the third tooth 13 are symmetrically arranged with respect to the center line of the second tooth 12, and the width of the second tooth 12 is smaller than the width of the first tooth 11 or the third tooth 13.

[0029] The winding 4 is wound only on the first tooth 11 and the third tooth 13 of the stator tooth group.

[0030] This application sets a uniformly distributed stator tooth group configuration and defines the three tooth combinations in each stator tooth group, as well as the winding method of the winding 4.

[0031] Typically, the width of the stator teeth affects the motor's magnetic circuit, as well as the distribution of the windings 4 in the slots and the magnitude of the electromagnetic force. It is necessary to comprehensively balance the motor efficiency and the electromagnetic force.

[0032] This application can increase the slot space occupied by each phase winding 4 of the motor by adjusting different stator tooth widths and tooth positions, while ensuring that the magnetic flux density of each tooth is not oversaturated, greatly reducing the amplitude of unbalanced electromagnetic force, reducing electromagnetic vibration and noise, effectively reducing copper loss, improving efficiency, and reducing electromagnetic force.

[0033] Existing stator motors, such as 9-slot 8-pole motors, require each stator tooth to be wound with a winding, and these windings are all for the same phase, such as the U phase, followed by the V and W phases. Therefore, the windings of each phase are concentrated within a stator circumference, resulting in an unbalanced electromagnetic force. This application, however, utilizes six teeth for winding, so the U-phase windings are not concentrated together. The resulting electromagnetic forces cancel each other out. By adjusting the magnetic flux density of the stator tooth assembly, the unbalanced electromagnetic force can be reduced to a reasonable and acceptable range.

[0034] The winding 4 is concentrated on the first tooth 11 and the third tooth 13. Its width and position determine the slot space and the spatial symmetry of the teeth, thus affecting the motor's copper losses and electromagnetic force. When the winding 4 is wound around the stator teeth, due to manufacturing reasons, it occupies a certain space in the slot space between two teeth, resulting in a reduction in the effective utilization space of the slots. By setting the width of the stator teeth and eliminating the winding 4, the slot space is maximized. At the same time, maintaining the spatial symmetry of the first tooth 11 and the third tooth 13 can effectively reduce unbalanced electromagnetic force.

[0035] In some embodiments, the tooth groove width between adjacent stator tooth groups is greater than the tooth groove width between the second tooth 12 and the first tooth 11 or the third tooth 13.

[0036] The second tooth 12 has no winding 4, increasing the slot space and serving only as a magnetic conduction circuit. The first tooth 11 and the third tooth 13 have winding 4, serving as magnetic conduction and magnetomotive force circuits. Therefore, the width of the first tooth 11 and the third tooth 13 is greater than the width of the second tooth 12, which can ensure that the magnetic flux density of the tooth is not oversaturated and affects the output.

[0037] Furthermore, the slot between the first tooth 11 of a stator tooth group and the third tooth 13 of an adjacent stator tooth group has two windings 4 within the slot space, which are wound on the first tooth 11 and the third tooth 13 respectively. In each stator tooth group, the slot space between the first tooth 11 and the second tooth 12, and between the third tooth 13 and the second tooth 12, each has only one winding 4, wound on the corresponding first tooth 11 and the third tooth 13 respectively.

[0038] In some embodiments, the included angle between adjacent stator tooth groups is de2, and the included angle of the stator tooth groups is de1, satisfying 0.5≤de1 / de2≤1.22.

[0039] To ensure that the tooth space between the first tooth 11 of a stator tooth group and the third tooth 13 of the adjacent stator tooth group is large enough to accommodate more than twice the number of stator tooth windings 4, the above-mentioned included angle relationship is set.

[0040] For example, the motor power used in household air conditioning systems is usually around 1KW, which satisfies a certain slot space. When the motor used has nine stator teeth, the effective slot space utilization rate is large due to the manufacturing process. At the same time, the first tooth 11 and the third tooth 13 are wound with concentrated windings 4, which are locking windings 4 to prevent overrunning. The stator teeth have tooth shoe parts 111.

[0041] To ensure higher efficiency, the number of turns of the winding on the stator teeth should be as large as possible, and the corresponding stator teeth should be wide. However, excessive width leads to encroachment on slot space, high copper losses, and low efficiency. Furthermore, it results in low tooth magnetic flux density, low output torque, and low efficiency. Ensuring that the widths of the first tooth 11 and the third tooth 13 are equal can balance slot space and tooth magnetic flux density, achieving optimal efficiency.

[0042] Optimal, the first tooth 11 and the third tooth 13 are symmetrically and uniformly distributed in space with respect to the second tooth 12, which has the best spatial symmetry. However, the first tooth 11 and the third tooth 13 themselves are spatially asymmetrically distributed, which leads to an unbalanced electromagnetic force. When the value of de2 / de1 increases, the slot space is utilized. Further increases reduce the slot utilization rate, while the unbalanced electromagnetic force caused by the first tooth 11 and the third tooth 13 intensifies.

[0043] In some embodiments, the width of the second tooth 12 is bt2, and the width of the first tooth 11 or the third tooth 13 is bt1, satisfying bt2≤0.28bt1.

[0044] More preferably, the motor assembly further includes a rotor 2 disposed within the stator 1, wherein the difference between the inner diameter of the stator 1 and the outer diameter of the rotor 2 is g, satisfying 1.5g≤bt2.

[0045] A larger width for the second tooth (12) results in a smaller effective slot area, which is detrimental to motor efficiency. Conversely, a smaller width exacerbates the spatial asymmetry of the motor stator teeth, which is also detrimental to electromagnetic force. By employing the aforementioned numerical relationships, optimal motor efficiency can be achieved.

[0046] In some embodiments, the rotor 2 has eight magnetic poles evenly distributed on its outer periphery.

[0047] An eight-pole rotor 2 structure is set inside the stator 1. Specifically, eight permanent magnets 3 are provided on the outer periphery of the rotor 2, which can greatly reduce unbalanced electromagnetic force and solve the problem that the efficiency of the compressor motor is difficult to improve at present.

[0048] In some embodiments, the first tooth 11 or the third tooth 13 includes a first boot portion 111, the width of the first side of the first boot portion 111 is eb1, the width of the second side is eb2, and the width satisfies 2eb2≤eb1≤3.2mm; the second side is the side close to the second tooth 12.

[0049] In the specific configuration of the first tooth 11 and the third tooth 13, an asymmetrical shoe part 111 is adopted to effectively lock the position of the winding 4, which is beneficial to the stability of the winding 4 between the stator tooth groups.

[0050] In some embodiments, the second tooth 12 has a symmetrical structure, including a second boot portion, the width of which is eb3, satisfying eb3 = eb2.

[0051] According to another aspect of this application, an electric motor is provided, including the motor assembly described above.

[0052] In some embodiments, the motor includes a three-phase motor, which includes a U-phase winding, a V-phase winding, and a W-phase winding. The U-phase winding, V-phase winding, and W-phase winding are sequentially and cyclically wound on the first tooth 11 and the third tooth 13, which are circumferentially arranged along the stator 1.

[0053] The motor proposed in this application can break through the efficiency bottleneck of the current 9S6P compressor motor, greatly improve the efficiency level of commonly used motors in this industry, break through the electromagnetic force bottleneck of the current 9S8P structure motor, greatly reduce the amplitude of unbalanced electromagnetic force, reduce electromagnetic vibration and noise, and reduce motor cost, mainly by reducing the amount of copper used in stator winding 4.

[0054] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above description is merely a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A motor assembly, characterized in that, include: The stator (1) includes a winding (4) and a stator tooth group. The stator tooth group is provided in multiple ways and is evenly arranged along the circumference of the stator (1). The stator tooth group is composed of a first tooth (11), a second tooth (12) and a third tooth (13) arranged sequentially along the circumference of the stator (1). The first tooth (11) and the third tooth (13) are symmetrically arranged with respect to the center line of the second tooth (12), and the width of the second tooth (12) is smaller than the width of the first tooth (11) or the third tooth (13). Only the first tooth (11) and the third tooth (13) of the stator tooth group have concentrated windings (4) wound on them; The width of the second tooth (12) is bt2, and the width of the first tooth (11) or the third tooth (13) is bt1, satisfying bt2≤0.28bt1; The included angle between adjacent stator tooth groups is de2, and the included angle between the stator tooth groups is de1, satisfying 0.5≤de1 / de2≤1.

22.

2. The motor assembly according to claim 1, characterized in that, The tooth groove width between adjacent stator tooth groups is greater than the tooth groove width between the second tooth (12) and the first tooth (11) or the third tooth (13).

3. The motor assembly according to claim 1, characterized in that, The motor assembly also includes a rotor (2) disposed within the stator (1), wherein the difference between the inner diameter of the stator (1) and the outer diameter of the rotor (2) is g, satisfying 1.5g≤bt2.

4. The motor assembly according to claim 3, characterized in that, The rotor (2) has eight magnetic poles evenly distributed on its outer periphery.

5. The motor assembly according to claim 1, characterized in that, The first tooth (11) or the third tooth (13) includes a first boot portion (111), the width of the first side of the first boot portion (111) is eb1, the width of the second side is eb2, and the second side satisfies 2eb2≤eb1≤3.2mm; the second side is the side close to the second tooth (12).

6. The motor assembly according to claim 5, characterized in that, The second tooth (12) has a symmetrical structure, including a second boot part, the width of which is eb3, satisfying eb3=eb2.

7. An electric motor, characterized in that, Includes the motor assembly as described in any one of claims 1-6.

8. The motor according to claim 7, characterized in that, The motor includes a three-phase motor, which includes a U-phase winding, a V-phase winding and a W-phase winding. The U-phase winding, V-phase winding and W-phase winding are sequentially wound around the first tooth (11) and the third tooth (13) that are circumferentially arranged along the stator (1).

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