Stator assembly, motor and electrical equipment

Abstract

The present invention provides a stator assembly, a motor and an electrical appliance. The stator assembly includes: a first stator including a first yoke portion and at least two first teeth, the at least two first teeth being disposed on an outer wall of the first yoke portion, a first stator slot being formed between two adjacent first teeth, the outer wall of the first stator including a plurality of first grooves, the plurality of first grooves including at least the first stator slot; a second stator including a second yoke portion and at least two second teeth, the second yoke portion being coaxially disposed with the first yoke portion and sleeved outside the first yoke portion, the at least two second teeth being disposed on an inner wall of the second yoke portion, a rotor assembly being configured to be placed between the first stator and the second stator; the first stator slot having a slot center line in a radial direction of the first stator, the second tooth having a tooth body center line in a radial direction of the second stator, an angle between the slot center line and the tooth body center line being greater than or equal to 0 degree and less than or equal to 72 / Ns degrees along a rotation direction of the rotor, where Ns is the number of the first grooves.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular, to a stator assembly, a motor, and an electrical appliance device. Background Art

[0002] In the related art, motors with double stators in the stator assembly are increasingly used. During the operation of the motor, how to reduce the loss of the motor and improve the operation efficiency of the motor has become an urgent problem to be solved. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] For this reason, in the first aspect of the present invention, a stator assembly is provided.

[0005] In the second aspect of the present invention, a motor is provided.

[0006] In the third aspect of the present invention, an electrical appliance device is provided.

[0007] The first aspect of the present invention provides a stator assembly, including: a first stator, the first stator includes a first yoke portion and at least two first teeth, at least two first teeth are arranged on the outer wall of the first yoke portion, a first stator slot is formed between two adjacent first teeth, the outer wall of the first stator includes a plurality of first grooves, and the plurality of first grooves at least include the first stator slot; a second stator, the second stator includes a second yoke portion and at least two second teeth, the second yoke portion is coaxially arranged with the first yoke portion and sleeved outside the first yoke portion, at least two second teeth are arranged on the inner wall of the second yoke portion, and a rotor assembly is placed between the first stator and the second stator; the first stator slot has a slot center line in the radial direction of the first stator, the second tooth has a tooth body center line in the radial direction of the second stator, and along the rotation direction of the rotor assembly, the included angle between the slot center line and the tooth body center line is greater than or equal to 0 degree and less than or equal to 72 / Ns degrees, where Ns is the number of the first grooves.

[0008] The stator assembly proposed by the present invention includes a first stator and a second stator, the first stator and the second stator are coaxially arranged, and the first stator is located inside the second stator. Further, a rotor is placed between the first stator and the second stator, and the rotor is coaxially arranged with both the first stator and the second stator.

[0009] Specifically, the first stator may include a first yoke and at least two first teeth. The first yoke is of an annular structure, and the at least two first teeth may be circumferentially distributed on the outer wall of the annular first yoke. Correspondingly, the second stator may include a second yoke and at least two second teeth. The second yoke is also of an annular structure, and the diameter of the second yoke is greater than that of the first yoke. The second yoke is sleeved outside the first yoke to form an inner and outer stator structure. Further, the at least two second teeth are circumferentially distributed on the inner wall of the annular second yoke, that is, both the first teeth and the second teeth extend towards the space between the first stator and the second stator. Further, a rotor assembly is placed between the first teeth and the plurality of second teeth to achieve the cooperation of the rotor assembly with the first stator and the second stator, and further achieve the rotation of the motor rotor assembly.

[0010] Further, a first stator slot is formed between two adjacent first teeth. In the radial direction of the first stator, the first stator slot has a slot center line. In the radial direction of the second stator, the second tooth has a tooth body center line. And, along the rotation direction of the rotor assembly, the included angle between the slot center line of the first stator slot and the tooth body center line of the second tooth is greater than or equal to 0 degrees and less than or equal to 72 / Ns degrees, that is, the slot center line of the first tooth is rotated along the rotation direction of the rotor assembly. When the slot center line reaches the tooth body center line of the second tooth, the rotated angle is greater than or equal to 0 degrees and less than or equal to 72 / Ns degrees, where Ns is the total number of first grooves included on the outer wall of the first stator. Through the setting of the first stator and the second stator, and the angle between the first stator and the second stator, the power density during the operation of the motor can be effectively improved, the power distribution performance of the motor can be enhanced, and the torque density during the operation of the motor can be significantly increased, thereby significantly increasing the torque of the motor and ensuring the operation requirements of the motor for high speed and high torque. It can also effectively improve the magnetic flux density in the first stator, the second stator and the rotor assembly during the operation of the motor, and further effectively reduce the loss of the motor and improve the operation efficiency of the motor.

[0011] The stator assembly provided by the present invention forms a radial double-stator structure of the motor by radially arranging the first stator and the second stator, so that the rotor of the motor can be arranged between the first stator and the second stator, thereby effectively improving the power density during the operation of the motor, enhancing the power distribution performance of the motor, and also effectively reducing the radial volume of the motor, which is beneficial to the miniaturized design of the motor. Further, through the limitation of the angle between the first stator and the second stator, the magnetic flux density in the first stator, the second stator and the rotor can be effectively improved during the operation of the motor, and further the loss of the motor can be effectively reduced and the operation efficiency of the motor can be improved.

[0012] According to the stator assembly provided by the present invention, the following additional technical features may also be included:

[0013] In the above technical solution, further, the first tooth includes: a first tooth body, one end of the first tooth body is connected to the first yoke portion; a first tooth boot, the first tooth boot is connected to the other end of the first tooth body, and at least two first sub-teeth are provided at one end of the first tooth boot away from the first tooth body, and a first sub-stator slot is included between two adjacent first sub-teeth, wherein the first groove further includes a first sub-stator slot.

[0014] In this technical solution, the first tooth specifically includes a first tooth body and a first tooth boot. Among them, one end of the first tooth body is connected to the first yoke portion, and the first tooth boot is arranged at the other end of the first tooth body. Further, at least two first sub-teeth are provided at one end of the first tooth boot away from the first tooth body, and a first sub-stator slot is included between two adjacent first sub-teeth. By providing at least two first sub-teeth, on the one hand, at least two first sub-teeth can be used as magnetic conduction components for magnetic conduction, and on the other hand, at least two first sub-teeth can also be used as modulation components to achieve the effect of magnetic field modulation. This introduces more harmonic components into the air-gap magnetic conductance, so that the performance of the motor is significantly improved.

[0015] Further, since at least two first sub-teeth are provided at the end of the first tooth, the first groove on the outer wall of the first stator includes both the first stator slots between adjacent first teeth and the first sub-stator slots between adjacent first sub-teeth. That is, at this time, the number of first grooves on the outer wall of the first stator is the sum of the number of first stator slots and the number of first sub-stator slots.

[0016] In any of the above technical solutions, further, the number of second teeth is equal to the number of first grooves.

[0017] In this technical solution, based on the condition that no sub-teeth are provided at the end of the second tooth, by defining the number of second teeth to be equal to the number of first grooves on the outer wall of the first stator, it is ensured that the number of second grooves on the inner wall of the second stator is equal to the number of first grooves on the outer wall of the first stator, thereby ensuring the distribution of the magnetic field during the operation of the motor and further ensuring the stable operation of the motor.

[0018] In any of the above technical solutions, further, the second tooth includes: a second tooth body, one end of the second tooth body is connected to the second stator yoke portion; a second tooth boot, the second tooth boot is connected to the other end of the second tooth body, and at least two second sub-teeth are provided at one end of the second tooth boot away from the second tooth body, and a second sub-stator slot is included between two adjacent second sub-teeth, wherein the sum of the number of second teeth and the number of second sub-stator slots is equal to the number of first grooves.

[0019] In this technical solution, when at least two second sub-teeth are provided at the end of the second tooth, by defining that the sum of the number of second teeth and the number of the second sub-stator slots is equal to the number of first grooves on the outer wall of the first stator, it is ensured that the number of second grooves on the inner wall of the second stator is equal to the number of first grooves on the outer wall of the first stator, thereby ensuring the distribution of the magnetic field during the operation of the motor and further ensuring the stable operation of the motor.

[0020] Specifically, the second tooth specifically includes a second tooth body and a second tooth boot. Among them, one end of the second tooth body is connected to the second yoke portion, and the second tooth boot is provided at the other end of the second tooth body. Further, at least two second sub-teeth are provided at the end of the second tooth boot away from the second tooth body, and a second sub-stator slot is included between two adjacent second sub-teeth. By providing at least two second sub-teeth, on the one hand, at least two second sub-teeth can be used as magnetic conduction components for magnetic conduction. On the other hand, at least two second sub-teeth can also be used as modulation components to achieve the effect of magnetic field modulation. This introduces more harmonic components into the air-gap permeance, so that the performance of the motor is significantly improved.

[0021] In any of the above technical solutions, further, the stator assembly further includes a winding, and the winding is provided on at least one of the first stator and the second stator.

[0022] In this technical solution, through the setting of the winding, the stator assembly can be cooperatively operated with the magnetic components on the rotor assembly to ensure the stable output of the motor torque and speed and ensure the motor operation efficiency.

[0023] Specifically, the winding can be provided on one of the first stator and the second stator to meet the requirements of the motor for different magnetic field distributions, and thus achieve different torque outputs of the motor. Moreover, by providing the winding on only one of the first stator and the second stator, on the basis of ensuring the motor operation efficiency, the winding material can be saved, the manufacturing cost of the motor can be effectively reduced, and the manufacturing structure can also be simplified.

[0024] Further, the winding can also be provided on both the first stator and the second stator at the same time to increase the magnetic density of the motor and further improve the torque output of the motor.

[0025] In any of the above technical solutions, further, the winding is provided on the first yoke portion and / or the second yoke portion.

[0026] In this technical solution, the winding can be provided on the first yoke portion of the first stator or on the second yoke portion of the second stator, thereby further improving the magnetic field waveform in the air gap between the stator assembly and the rotor assembly, and further making the magnetic field formed by the permanent magnet of the rotor assembly in the air gap closer to a sine wave, so as to further reduce the cogging torque and torque ripple of the motor and further improve the stability during the operation of the motor.

[0027] Further, according to the specific operating parameters and operating environment of the motor, the winding can be separately disposed on the first yoke portion of the first stator, or separately disposed on the second yoke portion of the second stator, or can be simultaneously disposed on the first yoke portion and the second yoke portion to ensure the operating effect of the motor.

[0028] In any of the above technical solutions, further, one winding is disposed on each first tooth; and / or one winding is disposed on each second tooth.

[0029] In this technical solution, when windings are disposed on the first stator, each winding can be disposed on one first tooth. Correspondingly, when windings are disposed on the second stator, each winding can be disposed on one second tooth. That is to say, the windings are disposed in a concentrated winding manner, so that during the operation of the motor, on the basis of ensuring that the air-gap magnetic field has sufficient sinusoidality, the winding winding process can be simplified, thereby reducing the manufacturing difficulty of the motor and the manufacturing cost.

[0030] In any of the above technical solutions, further, one winding is disposed on every two adjacent first teeth; and / or one winding is disposed on every two adjacent second teeth.

[0031] In this technical solution, when windings are disposed on the first stator, each winding can be wound around two first teeth simultaneously. Correspondingly, when windings are disposed on the second stator, each winding can also be wound around two second teeth simultaneously. That is to say, the windings are disposed in a distributed winding manner. Through the distributed winding manner, the sinusoidality of the air-gap magnetic field between the stator assembly and the rotor assembly can be effectively improved, thereby further reducing the cogging torque and torque ripple of the motor, and further improving the stability during the operation of the motor.

[0032] Further, the winding can also be set as a concentric winding. Specifically, the coils of the winding are set as a square shape with a hole in the middle, that is, the coils are set as coils with multiple layers of concentric settings, and each layer of coils winds around different numbers of stator teeth.

[0033] Further, one winding is disposed on every two adjacent first teeth or every two adjacent second teeth.

[0034] According to a second aspect of the present invention, a motor is proposed, including: a rotor assembly; a stator assembly according to any one of the above technical solutions, at least a part of the stator assembly is located inside the rotor assembly.

[0035] For the motor provided by the present invention, at least a part of the stator assembly is located inside the rotor assembly. Specifically, the stator assembly and the rotor assembly are concentrically arranged to ensure that the rotor assembly can rotate relative to the stator assembly to achieve the power output of the motor. Among them, a part of the stator assembly is located inside the rotor assembly, or the whole of the stator assembly in the axial direction can be arranged inside the rotor assembly to achieve different matching methods between the permanent magnets of the rotor assembly and the windings of the stator assembly.

[0036] Furthermore, through the arrangement of the first stator and the second stator of the stator assembly, the power density during the operation of the motor can be effectively improved, the power distribution performance of the motor can be enhanced, and the torque density during the operation of the motor can also be significantly increased. Furthermore, the torque of the motor can be significantly increased, ensuring the operation requirements of the motor for high speed and high torque. Compared with the motors in the related art, the double-stator motor can effectively reduce the radial volume of the motor while ensuring the performance of the motor, which is beneficial to the miniaturization design of the motor.

[0037] In any of the above technical solutions, further, the rotor assembly includes a plurality of permanent magnets and a plurality of magnetic isolation parts, and the plurality of permanent magnets and the plurality of magnetic isolation parts are arranged alternately.

[0038] In this technical solution, the rotor assembly may include permanent magnets and magnetic isolation parts, and the number of permanent magnets is the same as the number of magnetic isolation parts. Furthermore, the plurality of permanent magnets and the plurality of magnetic isolation parts are arranged alternately and form a ring, so that the rotor assembly can be concentrically arranged with the first stator and the second stator. Furthermore, the diameter of the rotor assembly can be set to be greater than the diameter of the first stator and less than the diameter of the second stator, thereby ensuring that the rotor assembly can be sleeved between the first stator and the second stator.

[0039] By arranging the plurality of permanent magnets and the plurality of magnetic isolation parts alternately, the magnetic field of the permanent magnets can effectively form a magnetic field loop between the stator and the rotor, and further ensure that the magnetic fields between the windings and the permanent magnets can be effectively matched to ensure the operation effect of the motor.

[0040] In any of the above technical solutions, further, the polarities of two adjacent permanent magnets are opposite.

[0041] In this technical solution, by setting the polarities of two adjacent permanent magnets to be opposite, an effective magnetic flux concentration effect can be formed between the two adjacent permanent magnets, thereby further increasing the air-gap magnetic density between the stator assembly and the rotor assembly of the motor, and further effectively increasing the motor torque and reducing the torque ripple, improving the motor stability.

[0042] Furthermore, the permanent magnets can be arranged in a spoke-type magnet arrangement or a V-shaped magnet arrangement.

[0043] In any of the above technical solutions, further, the magnetic isolation part includes a magnetic conductive component and / or a non-magnetic conductive component.

[0044] In this technical solution, the magnetic isolation part between adjacent permanent magnets can be set as a magnetic conductive component. Specifically, the rotor assembly may include an annular iron core, and mounting grooves for mounting permanent magnets are arranged at intervals on the annular iron core. At the same time, at least a part of the rotor iron core is used to form a magnetic bridge between the mounting grooves, and this magnetic bridge is the magnetic isolation part, so as to realize the separation of adjacent permanent magnets. Through the above setting method, the body structure of the rotor iron core can be utilized to simplify the processing technology of the rotor assembly, reduce the processing difficulty, and thus reduce the manufacturing cost of the motor.

[0045] Further, the magnetic isolation part may also include a non-magnetic conductive component, so as to effectively avoid magnetic leakage of the rotor assembly, and further improve the magnetic density during the operation of the motor, and ensure the operation effect of the motor.

[0046] In any of the above technical solutions, further, the permanent magnet includes ferrite or rare earth permanent magnet.

[0047] In this technical solution, ferrite or rare earth permanent magnet has good magnetic energy. By using ferrite or rare earth permanent magnet as the permanent magnet of the rotor assembly, it can be ensured that the permanent magnet can effectively provide magnetic energy for a long time, and thus ensure the long-term stable operation of the motor.

[0048] In any of the above technical solutions, further, the number of pole pairs of the winding of the stator assembly satisfies the following relational expression: Pa = ∣Ns ± Zr / 2∣; where Pa is the number of pole pairs of the winding of the stator assembly, Ns is the total number of the first grooves of the first stator, and Zr is the number of magnetic isolation parts.

[0049] In this technical solution, through the limitation of the number of pole pairs of the stator winding, the normal operation of the motor is ensured, and further, the new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thus effectively improving the torque density of the motor. Specifically, the number of pole pairs of the winding of the stator assembly satisfies the following relational expression: Pa = ∣Ns ± Zr / 2∣; where Pa is the number of pole pairs of the winding of the stator assembly, Ns is the total number of the first grooves of the first stator, and Zr is the number of magnetic isolation parts.

[0050] According to the third aspect of the present invention, an electrical device is proposed, including the motor in any of the above technical solutions.

[0051] The electrical device provided by the present invention includes the motor in any of the above technical solutions, so it has all the beneficial effects of this motor, which will not be elaborated here.

[0052] Additional aspects and advantages of the present invention will become apparent in the following description section or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of embodiments in conjunction with the following drawings, where:

[0054] Figure 1 A schematic structural diagram of a motor provided by an embodiment of the present invention is shown;

[0055] Figure 2 A schematic structural diagram of a motor provided by another embodiment of the present invention is shown;

[0056] Figure 3 A schematic structural diagram of a motor provided by yet another embodiment of the present invention is shown;

[0057] Figure 4 A schematic structural diagram of a motor provided by yet another embodiment of the present invention is shown;

[0058] Figure 5 A schematic structural diagram of a motor provided by yet another embodiment of the present invention is shown;

[0059] Figure 6 A schematic structural diagram of a motor provided by yet another embodiment of the present invention is shown;

[0060] Figure 7 A schematic structural diagram of a motor provided by yet another embodiment of the present invention is shown;

[0061] Figure 8 A schematic structural diagram of a motor provided by yet another embodiment of the present invention is shown;

[0062] Figure 9 A schematic diagram showing the relationship between the angle between the slot center line and the tooth body center line during the operation of the motor provided by the embodiment of the present invention and the efficiency of the motor;

[0063] Figure 10 A schematic diagram showing the relationship between the angle between the slot center line and the tooth body center line during the operation of the motor provided by the embodiment of the present invention and the average torque and iron loss of the motor;

[0064] Figure 11 A schematic diagram showing the magnetic flux density distribution of the motor when the angle between the slot center line and the tooth body center line is -4 degrees during the operation of the motor provided by the embodiment of the present invention;

[0065] Figure 12 A schematic diagram showing the magnetic flux density distribution of the motor when the angle between the slot center line and the tooth body center line is 0 degrees during the operation of the motor provided by the embodiment of the present invention;

[0066] Figure 13 It shows a schematic diagram of the magnetic flux density distribution of the motor when the angle between the slot center line and the tooth body center line during the operation of the motor provided by the embodiment of the present invention is 4 degrees.

[0067] Among them, Figures 1 to 8 and Figures 11 to 13 The corresponding relationship between the reference numerals in the drawings and the components is as follows:

[0068] 100 Stator assembly, 102 First stator, 104 First yoke, 106 First tooth, 108 Second stator, 110 Second yoke, 112 Second tooth, 114 First tooth body, 116 First tooth shoe, 118 First auxiliary tooth, 120 Second tooth body, 122 Second tooth shoe, 124 Winding, 126 Second auxiliary tooth, 128 First stator slot, 130 First groove, 132 First auxiliary stator slot, 134 Second groove, 136 Second auxiliary stator slot, 138 Second stator slot, 200 Motor, 202 Rotor assembly, 204 Permanent magnet, 206 Magnetic isolation part. Detailed implementation manners

[0069] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0070] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0071] Next, refer to Figures 1 to 13 to describe the stator assembly, motor and electrical equipment provided according to some embodiments of the present invention. Among them, Figure 1 , Figure 11 and Figure 13 In, the line L1 represents the slot center line of the first stator slot 128 in the radial direction of the first stator 102, the line L2 represents the tooth body center line of the second tooth 112 in the radial direction of the second stator 108, and α represents the angle between the slot center line L1 and the tooth body center line L2. Figure 10 In, the line L3 represents the average torque change curve of the motor, and the line L4 represents the iron loss change curve of the motor.

[0072] The present invention proposes a first aspect, and proposes a stator assembly 100, as Figure 1 and Figure 2As shown in the figure, it includes: a first stator 102 and a second stator 108. The first stator 102 and the second stator 108 are coaxially arranged, and the second stator 108 is located outside the first stator 102. Among them, the first stator 102 includes a first yoke 104 and at least two first teeth 106. The at least two first teeth 106 are arranged on the outer wall of the first yoke 104. A first stator slot 128 is formed between two adjacent first teeth 106. The outer wall of the first stator 102 includes a plurality of first grooves 130, and the plurality of first grooves 130 at least includes the first stator slot 128; the second stator 108 includes a second yoke 110 and at least two second teeth 112. The second yoke 110 is coaxially arranged with the first yoke 104 and sleeved outside the first yoke 104. The at least two second teeth 112 are arranged on the inner wall of the second yoke 110. A rotor is placed between the first stator 102 and the second stator 108; the first stator slot 128 has a slot center line L1 in the radial direction of the first stator 102, and the second tooth 112 has a tooth body center line L2 in the radial direction of the second stator 108. Along the rotation direction of the rotor, the included angle α between the slot center line L1 and the tooth body center line L2 is greater than or equal to 0 degree and less than or equal to 72 / Ns degrees, where Ns is the number of the first grooves 130.

[0073] The stator assembly 100 proposed by the present invention includes a first stator 102 and a second stator 108. The first stator 102 and the second stator 108 are coaxially arranged, and the first stator 102 is located inside the second stator 108. Further, a rotor is placed between the first stator 102 and the second stator 108, and the rotor is coaxially arranged with both the first stator 102 and the second stator 108.

[0074] Specifically, the first stator 102 may include a first yoke 104 and at least two first teeth 106. The first yoke 104 is an annular structure, and the at least two first teeth 106 may be circumferentially distributed along the outer wall of the annular first yoke 104. Correspondingly, the second stator 108 may include a second yoke 110 and at least two second teeth 112. The second yoke 110 is also an annular structure, and the diameter of the second yoke 110 is larger than that of the first yoke 104. The second yoke 110 is sleeved outside the first yoke 104 to form an inner and outer stator structure. Further, the at least two second teeth 112 are circumferentially distributed along the inner wall of the annular second yoke 110, that is, both the first teeth 106 and the second teeth 112 extend towards the space between the first stator 102 and the second stator 108. Further, a rotor assembly 202 is placed between the first teeth 106 and the plurality of second teeth 112 to realize the cooperation between the rotor and the first stator 102 and the second stator 108, and further realize the rotation of the motor rotor assembly 202.

[0075] Further, as Figure 1As shown, a first stator slot 128 is formed between two adjacent first teeth 106. In the radial direction of the first stator 102, the first stator slot 128 has a slot center line L1. In the radial direction of the second stator 108, the second tooth 112 has a tooth body center line L2. And, along the rotation direction of the rotor assembly (as shown by the arrow in Figure 1 and Figures 11 to 13 ), the included angle α between the slot center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112 is greater than or equal to 0 degrees and less than or equal to 72 / Ns degrees. That is, when the slot center line L1 of the first tooth 106 is rotated along the rotation direction of the rotor assembly 202, when the slot center line L1 reaches the tooth body center line L2 of the second tooth 112, the rotated angle α is greater than or equal to 0 degrees and less than or equal to 72 / Ns degrees, where Ns is the total number of the first grooves 130 included on the outer wall of the first stator 102. Through the first stator 102 and the second stator 108, and the setting of the angle between the first stator 102 and the second stator 108, the power density during the operation of the motor can be effectively improved, the power distribution performance of the motor can be enhanced, and the torque density during the operation of the motor can also be significantly improved, thereby significantly improving the torque of the motor, ensuring the operation requirements of the motor for high speed and high torque. It can also effectively improve the magnetic flux density in the first stator 102, the second stator 108 and the rotor assembly 202 during the operation of the motor, thereby effectively reducing the loss of the motor and improving the operation efficiency of the motor.

[0076] Specifically, as shown in Figure 1 , the included angle α between the slot center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112 is greater than 0 degrees and less than or equal to 72 / Ns degrees.

[0077] Specifically, as shown in Figure 2 , the included angle α between the slot center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112 is 0 degrees.

[0078] Specifically, when no auxiliary tooth is provided at the end of the first tooth 106, the first groove 130 is the first stator slot 128 between two adjacent first teeth 106. At this time, the number of the first grooves 130 is the number of the first stator slots 128. When at least one auxiliary tooth is provided at the end of the first tooth 106, an auxiliary tooth slot is formed between two adjacent auxiliary teeth. At this time, the first groove 130 includes the first stator slot 128 between two adjacent first teeth 106 and also includes the auxiliary tooth slot between two adjacent auxiliary teeth. That is, at this time, the number of the first grooves 130 is the sum of the number of the first stator slots 128 and the number of the auxiliary tooth slots.

[0079] Further, a plurality of second grooves 134 are included on the inner wall of the second stator 108, and the total number of the second grooves 134 is the same as the total number of the first grooves 130 included on the outer wall of the first stator 102. Thereby, the distribution of the magnetic field during the operation of the motor is ensured, and further the stable operation of the motor is ensured. Specifically, when no auxiliary teeth are provided at the ends of the first teeth 106 and the second teeth 112, the number of the first grooves 130 on the outer wall of the first stator 102 is the number of the first teeth 106, and the number of the second grooves 134 on the inner wall of the second teeth 112 is the number of the second teeth 112, that is, the number of the first teeth 106 is the same as the number of the second teeth 112. When auxiliary teeth are provided at the ends of the first teeth and no auxiliary teeth are provided at the ends of the second teeth 112, the number of the first grooves 130 on the inner wall of the first teeth 106 is the sum of the number of the first stator slots 128 and the number of the auxiliary tooth slots between adjacent first teeth 106, and the number of the second grooves 134 is also the sum of the number of the first stator slots 128 and the number of the auxiliary tooth slots between adjacent first teeth 106.

[0080] Specifically, as shown in Table 1 and Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 , taking the number of the first teeth 106 as 6 and two auxiliary teeth are provided at the ends of the first teeth 106 as an example, the outer wall of the first teeth 106 has 6 first stator slots 128 and 6 first auxiliary stator slots 132. At this time, the total number of the first grooves 130 on the outer wall of the first stator 102 is 12. At this time, 12 second grooves 134 are also provided on the inner wall of the second stator 108, and no auxiliary teeth are provided at the ends of the second teeth 112. Therefore, the number of the second grooves 134 on the inner wall of the second stator 108 is the number of the second teeth 112, which is 12. At this time, the included angle α between the groove center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112 is 0 degree to 6 degrees, and specifically, 4 degrees can be taken. Among them, when L1 is in front of L2 in the rotation direction of the rotor assembly 202, the angle of α is negative, and when L1 is behind L2, the angle of α is positive.

[0081] Specifically, in Figure 9 , the abscissa is the angle value of the included angle α between the groove center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112, and the ordinate is the efficiency value of the motor. Figure 10 , the abscissa is the angle value of the included angle α between the groove center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112, L3 is the average torque change curve of the motor, and L4 is the iron loss change curve of the motor. In Figure 11 , Figure 12 and Figure 13Among them, the density of the lines in the first stator 102 and the second stator 108 represents the load magnetic flux density in the first stator 102 and the second stator 108, that is, it reflects the iron loss situation of the motor. The greater the line density, the greater the iron loss. On the contrary, the smaller the line density, the smaller the iron loss. It can be seen that when the value of the included angle α is 4 degrees, the iron loss of the motor is significantly lower than that when the value of the included angle α is -4 degrees and 0 degrees, and the output and input power, torque, and efficiency of the motor are all higher than those when the value of the included angle α is -4 degrees and 0 degrees. Thus, it can be seen that by adjusting the limit of the α angle value, the iron loss and copper loss during the operation of the motor can be significantly reduced, and the input power, output power, and torque of the motor can be significantly improved.

[0082] Table 1. Influence of the included angle α between the slot center line L1 of the first stator and the tooth body center line L2 of the second tooth on the motor performance

[0083] Solution α is -4° α is 0° α is +4° Copper loss (W) 4.4 4.4 4.4 Iron loss (W) 4.95 4.14 2.84 Torque (Nm) 0.36 0.41 0.37 Output power (W) 37.81 43.15 39.18 Input power (W) 47.2 51.7 46.4 Efficiency 80.14％ 83.44％ 84.37％

[0084] That is to say, the size of the included angle α between the slot center line L1 of the first stator slot 128 and the tooth body center line L2 of the second tooth 112 can be determined according to the number of stator teeth and the number of auxiliary teeth of the first stator 102 to ensure the best effect of reducing the loss of the motor and improving the operation efficiency of the motor during the operation of the motor.

[0085] The stator assembly 100 provided by the present invention forms a radial double-stator structure of the motor by radially arranging the first stator 102 and the second stator 108, so that the rotor assembly 202 of the motor can be arranged between the first stator 102 and the second stator 108, thereby effectively improving the power density during the operation of the motor, enhancing the power distribution performance of the motor, and also being able to effectively reduce the radial volume of the motor, which is beneficial to the miniaturization design of the motor. Further, by limiting the angle between the first stator 102 and the second stator 108, the magnetic flux density in the first stator 102, the second stator 108, and the rotor assembly 202 can be effectively improved during the operation of the motor, and further, the loss of the motor can be effectively reduced and the operation efficiency of the motor can be improved.

[0086] In the above embodiment, further, as Figure 3 shown, the first tooth 106 may include a first tooth body 114 and a first tooth shoe 116: among them, one end of the first tooth body 114 is connected to the first yoke portion 104; the first tooth shoe 116 is connected to the other end of the first tooth body 114, and at least two first auxiliary teeth 118 are provided at the end of the first tooth shoe 116 away from the first tooth body 114. A first auxiliary stator slot 132 is included between two adjacent first auxiliary teeth 118, and among them, the first groove 130 further includes the first auxiliary stator slot 132.

[0087] In this embodiment, by providing the first stator 102 and the second stator 108, the power density during the operation of the motor can be effectively increased, the power distribution performance of the motor can be enhanced, and the torque density during the operation of the motor can also be significantly increased. Furthermore, the torque of the motor can be significantly increased, ensuring the operation requirements of the motor for high speed and high torque. Compared with the motors in the related art, while ensuring the performance of the motor, the double-stator motor can effectively reduce the radial volume of the motor, which is beneficial to the miniaturization design of the motor. On this basis, by providing the first auxiliary teeth 118 at the end of the first teeth 106, the cogging torque and torque ripple of the motor can be reduced, thereby improving the performance of the motor.

[0088] Specifically, the first teeth 106 specifically include a first tooth body 114 and a first tooth shoe 116. Among them, one end of the first tooth body 114 is connected to the first yoke portion 104, and the first tooth shoe 116 is provided at the other end of the first tooth body 114. Further, at least two first auxiliary teeth 118 are provided at the end of the first tooth shoe 116 away from the first tooth body 114. A first auxiliary stator slot 132 is included between two adjacent first auxiliary teeth 118. By providing at least two first auxiliary teeth 118, on the one hand, at least two first auxiliary teeth 118 can be used as magnetic conduction components for magnetic conduction. On the other hand, the first auxiliary teeth 118 can also be used as modulation components to achieve the effect of magnetic field modulation. This introduces more harmonic components into the air-gap permeance. In this way, the performance of the motor is significantly improved.

[0089] Further, since at least two first auxiliary teeth 118 are provided at the end of the first teeth 106, the first grooves 130 on the outer wall of the first stator 102 include not only the first stator slots 128 between adjacent first teeth 106, but also the first auxiliary stator slots 132 between adjacent first auxiliary teeth 118. That is, at this time, the number of the first grooves 130 on the outer wall of the first stator 102 is the sum of the number of the first stator slots 128 and the number of the first auxiliary stator slots 132.

[0090] Specifically, a detachable connection can be provided between the first tooth body 114 and the first tooth boot 116. At the same time, a detachable connection can also be provided between the first tooth body 114 and the first yoke portion 104. That is to say, a separable nested assembly structure can be provided between the first tooth body 114, the first yoke portion 104, and the first tooth boot 116. By providing the separable nested assembly structure among the first tooth body 114, the first tooth boot 116, and the first yoke portion 104, during the assembly process of the stator assembly 100, the winding 124 can be wound around the first tooth body 114 first, then one end of the first tooth body 114 can be connected to the first yoke portion 104, and finally the first tooth boot 116 can be installed at the other end of the first tooth body 114. Thereby, the winding process during the assembly of the stator assembly 100 is simplified, the difficulty of winding is reduced, the slot filling rate of the winding 124 is increased, the output performance of the motor is improved, and at the same time, waste can be reduced and material waste can be reduced.

[0091] Specifically, the first tooth body 114 and the first yoke portion 104 can be connected through a concave-convex structure. That is to say, a groove or a protrusion is provided at one end of the first tooth body 114. Correspondingly, a protrusion or a groove that mates with the groove or the protrusion is provided at the corresponding position of the first yoke portion 104. Thus, the connection between the first tooth body 114 and the first yoke portion 104 can be achieved through the cooperation of the groove and the protrusion.

[0092] Correspondingly, the first tooth body 114 and the first tooth boot 116 can also be connected through a concave-convex structure, that is, the first tooth boot 116 and the first tooth body 114 are connected through a cooperating protrusion and groove to simplify the winding process.

[0093] Further, the number of the second teeth 112 is equal to the number of the first grooves 130.

[0094] Specifically, the end of the second tooth 112 of the second stator 108 may or may not be provided with an auxiliary tooth. Specifically, in the case where the end of the second tooth 112 is not provided with an auxiliary tooth, by limiting the number of the second teeth 112 to be equal to the number of the first grooves 130 on the outer wall of the first stator 102, it is ensured that the number of the second grooves 134 on the inner wall of the second stator 108 is equal to the number of the first grooves 130 on the outer wall of the first stator 102, thereby ensuring the distribution of the magnetic field during the operation of the motor and ensuring the stable operation of the motor.

[0095] In any of the above embodiments, further, as Figure 4As shown, the second tooth 112 may include a second tooth body 120 and a second tooth boot 122. One end of the second tooth body 120 is connected to the yoke of the second stator 108; the second tooth boot 122 is connected to the other end of the second tooth body 120, and at least two second sub-teeth 126 are provided at one end of the second tooth boot 122 away from the second tooth body 120. A second sub-stator slot 136 is included between two adjacent second sub-teeth 126. The sum of the number of the second teeth 112 and the number of the second sub-stator slots 136 is equal to the number of the first grooves 130.

[0096] In this embodiment, through the setting of the double stator, the power density during the operation of the motor can be effectively improved, the power distribution performance of the motor can be enhanced, and the torque density during the operation of the motor can also be significantly increased. Furthermore, the torque of the motor can be significantly increased, ensuring the operation requirements of the motor for high speed and high torque. Compared with the motors in the related art, the double-stator motor can effectively reduce the radial volume of the motor while ensuring the performance of the motor, which is beneficial to the miniaturization design of the motor. On this basis, by providing the second sub-teeth 126 at the end of the second tooth 112, the cogging torque and torque ripple of the motor are reduced, and thus the performance of the motor is improved.

[0097] Specifically, the second tooth 112 specifically includes a second tooth body 120 and a second tooth boot 122. One end of the second tooth body 120 is connected to the second yoke 110, and the second tooth boot 122 is provided at the other end of the second tooth body 120. Further, at least two second sub-teeth 126 are provided at one end of the second tooth boot 122 away from the second tooth body 120. A second sub-stator slot 136 is included between two adjacent second sub-teeth 126. Through the setting of at least two second sub-teeth 126, on the one hand, at least two second sub-teeth 126 can be used as magnetic conduction components for magnetic conduction, and on the other hand, at least two second sub-teeth 126 can also be used as modulation components to achieve the function of magnetic field modulation. More harmonic components are introduced into the air-gap permeance, so that the performance of the motor is significantly improved.

[0098] Based on the situation that at least two second sub-teeth 126 are provided at the end of the second tooth 112, a second stator slot 138 is included between two adjacent second teeth 112, and a second sub-stator slot 136 is formed between two adjacent second sub-teeth 126 on the same second tooth boot 122. The second groove 134 includes both the second stator slot 138 and the second sub-stator slot 136. By limiting the sum of the number of the second teeth 112 and the number of the second sub-stator slots 136 to be equal to the number of the first grooves 130 on the outer wall of the first stator 102, it is ensured that the number of the second grooves 134 on the inner wall of the second stator 108 is equal to the number of the first grooves 130 on the outer wall of the first stator 102, and further the distribution of the magnetic field during the operation of the motor is ensured, and thus the stable operation of the motor is ensured.

[0099] Specifically, a detachable connection can be provided between the second tooth body 120 and the second tooth boot 122. At the same time, a detachable connection can also be provided between the second tooth body 120 and the second yoke portion 110. That is to say, a separable sleeve assembly structure can be provided between the second tooth body 120, the second yoke portion 110, and the second tooth boot 122. Through the provision of the separable sleeve assembly structure among the second tooth body 120, the second tooth boot 122, and the second yoke portion 110, during the assembly process of the stator assembly 100, the winding 124 can be wound around the second tooth body 120 first, then one end of the second tooth body 120 can be connected to the second yoke portion 110, and finally the second tooth boot 122 can be installed at the other end of the second tooth body 120. Thereby, the winding process during the assembly of the stator assembly 100 is simplified, the difficulty of winding is reduced, the slot filling rate of the winding 124 is increased, the output performance of the motor is improved from the perspective of stator preparation, and at the same time, waste can be reduced and material waste can be reduced.

[0100] Specifically, the second tooth body 120 and the second yoke portion 110 can be connected through a concave-convex structure. That is to say, a groove or a protrusion is provided at one end of the second tooth body 120. Correspondingly, a protrusion or a groove that cooperates with the groove or the protrusion is provided at the corresponding position of the second yoke portion 110. Thus, the connection between the second tooth body 120 and the second yoke portion 110 can be achieved through the cooperation of the groove and the protrusion.

[0101] Correspondingly, the second tooth body 120 and the second tooth boot 122 can also be connected through a concave-convex structure, that is, they are connected through a protrusion and a groove that cooperate with each other between the second tooth boot 122 and the second tooth body 120 to simplify the winding process.

[0102] In any of the above embodiments, further, as Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, the stator assembly 100 further includes a winding 124, and the winding 124 is provided on at least one of the first stator 102 and the second stator 108.

[0103] In this embodiment, through the provision of the winding 124, the stator assembly 100 can be operated in cooperation with the magnetic components on the rotor assembly 202 to ensure the stable output of the motor torque and speed and ensure the motor operation efficiency.

[0104] Specifically, the winding 124 can be disposed on either the first stator 102 or the second stator 108 to meet the requirements of the motor for different magnetic field distributions, and thus achieve different torque outputs of the motor. Moreover, by disposing the winding 124 on only one of the first stator 102 and the second stator 108, while ensuring the operating efficiency of the motor, the material of the winding 124 can be saved, the manufacturing cost of the motor can be effectively reduced, and the manufacturing structure can also be simplified.

[0105] Furthermore, the winding 124 can also be disposed on both the first stator 102 and the second stator 108 simultaneously to increase the magnetic flux density of the motor and further improve the torque output of the motor.

[0106] Furthermore, the winding 124 is disposed on the first yoke 104 and / or the second yoke 110.

[0107] Specifically, the winding 124 can be disposed on the first yoke 104 of the first stator 102 or on the second yoke 110 of the second stator 108, so as to further improve the magnetic field waveform in the air gap between the stator assembly 100 and the rotor assembly 202, and thus make the magnetic field formed by the permanent magnets of the rotor assembly 202 in the air gap closer to a sine wave, so as to further reduce the cogging torque and torque ripple of the motor, and further improve the stability during the operation of the motor.

[0108] Furthermore, according to the specific operating parameters and operating environment of the motor, the winding 124 can be disposed alone on the first yoke 104 of the first stator 102, or alone on the second yoke 110 of the second stator 108, or can be disposed on both the first yoke 104 and the second yoke 110 simultaneously to ensure the operating effect of the motor.

[0109] In any of the above embodiments, further, as Figures 1 to 5 shown, one winding 124 is disposed on each first tooth 106; and / or one winding 124 is disposed on each second tooth 112.

[0110] In this embodiment, when the winding 124 is disposed on the first stator 102, each winding 124 can be disposed on one first tooth 106. Correspondingly, when the winding 124 is disposed on the second stator 108, each winding 124 can be disposed on one second tooth 112. That is to say, the winding 124 is disposed in a concentrated winding manner, so that during the operation of the motor, on the basis of ensuring that the air gap magnetic field has sufficient sinusoidality, the winding process of the winding 124 can be simplified, thereby reducing the manufacturing difficulty of the motor and the manufacturing cost.

[0111] Specifically, the winding 124 can be first wound around the first tooth body 114 or the second tooth body 120, then one end of the first tooth body 114 or the second tooth body 120 is connected to the first yoke portion 104 or the second yoke portion 110, and finally the first tooth boot 116 or the second tooth boot 122 is installed at the other end of the first tooth body 114 or the second tooth body 120. Thus, the winding process during the assembly of the stator assembly 100 is simplified, the winding difficulty is reduced, the slot filling factor of the winding 124 is increased, the output performance of the motor is improved from the perspective of stator preparation, and at the same time, waste can be reduced and material waste can be minimized.

[0112] Further, one winding 124 is provided between every two adjacent first teeth 106; and / or one winding 124 is provided between every two adjacent second teeth 112.

[0113] Specifically, when the winding 124 is provided on the first stator 102, each winding 124 can be wound around two first teeth 106 at the same time. Correspondingly, when the winding 124 is provided on the second stator 108, each winding 124 can also be wound around two second teeth 112 at the same time. That is to say, the winding 124 is arranged in the form of a distributed winding. By means of the distributed winding, the sinusoidality of the air-gap magnetic field between the stator assembly 100 and the rotor assembly 202 can be effectively improved, thereby further reducing the cogging torque and torque ripple of the motor, and further enhancing the stability during the operation of the motor.

[0114] Further, the winding 124 can also be arranged as a concentric winding. Specifically, the coils of the winding 124 are arranged in a square shape with a hole in the middle, that is, the coils are arranged as multi-layer concentric coils, and each layer of coils winds around different numbers of stator teeth.

[0115] Further, one winding 124 is provided between every two adjacent first teeth 106 or every two adjacent second teeth 112, or one winding 124 is provided between every two adjacent first teeth 106, and at the same time one winding 124 is provided between every two adjacent second teeth 112.

[0116] According to the second aspect of the present invention, as Figures 1 to 8 shown, a motor 200 is proposed, including: a rotor assembly 202; the stator assembly 100 according to any one of the above embodiments, and at least a part of the stator assembly 100 is located inside the rotor assembly 202.

[0117] The motor 200 provided by the present invention has at least a part of the stator assembly 100 located inside the rotor assembly 202. Specifically, the stator assembly 100 and the rotor assembly 202 are concentrically arranged to ensure that the rotor assembly 202 can rotate relative to the stator assembly 100 to achieve the power output of the motor 200. Among them, a part of the stator assembly 100 is located inside the rotor assembly 202, or the whole of the stator assembly 100 in the axial direction can be arranged inside the rotor assembly 202 to achieve different matching methods between the permanent magnets of the rotor assembly 202 and the windings 124 of the stator assembly 100.

[0118] Furthermore, through the settings of the first stator 102 and the second stator 108 of the stator assembly 100, the power density during the operation of the motor 200 can be effectively improved, the power distribution performance of the motor 200 can be enhanced, and the torque density during the operation of the motor 200 can also be significantly increased. Furthermore, the torque of the motor 200 can be significantly increased, ensuring the operation requirements of the motor 200 for high speed and high torque. Compared with the motors in the related art, the double-stator motor can effectively reduce the radial volume of the motor 200 while ensuring the performance of the motor 200, which is beneficial to the miniaturized design of the motor 200.

[0119] In any of the above embodiments, further, as Figures 1 to 8 shown, the rotor assembly 202 includes a plurality of permanent magnets 204 and a plurality of magnetic isolation parts 206, and the plurality of permanent magnets 204 and the plurality of magnetic isolation parts 206 are arranged alternately.

[0120] In this embodiment, the rotor assembly 202 may include permanent magnets 204 and magnetic isolation parts 206, and the number of permanent magnets 204 is the same as the number of magnetic isolation parts 206. Furthermore, in the circumferential direction of the rotor assembly 202, the plurality of permanent magnets 204 and the plurality of magnetic isolation parts 206 are arranged alternately and form a ring, so that the rotor assembly 202 can be concentrically arranged with the first stator 102 and the second stator 108. Furthermore, the diameter of the rotor assembly 202 can be set to be greater than the diameter of the first stator 102 and less than the diameter of the second stator 108, thereby ensuring that the rotor assembly 202 can be sleeved between the first stator 102 and the second stator 108.

[0121] Through the alternating arrangement of the plurality of permanent magnets 204 and the plurality of magnetic isolation parts 206, the magnetic field of the permanent magnets 204 can effectively form a magnetic field loop between the stator and the rotor, and further ensure that the magnetic field between the windings 124 and the permanent magnets 204 can be effectively matched to ensure the operation effect of the motor 200.

[0122] Furthermore, the polarities of two adjacent permanent magnets 204 are opposite.

[0123] Specifically, by setting the polarities of two adjacent permanent magnets 204 to be opposite, an effective magnetic concentration effect can be formed between the two adjacent permanent magnets 204, thereby further increasing the air-gap magnetic density between the stator assembly 100 and the rotor assembly 202 in the motor 200, and further effectively increasing the torque of the motor 200, reducing torque ripple, and improving the stability of the motor 200.

[0124] Further, as Figure 4 and Figure 5 shown, the permanent magnets 204 can be arranged in a spoke-shaped magnet arrangement or a V-shaped magnet arrangement.

[0125] In any of the above embodiments, further, the magnetic isolation portion 206 includes a magnetic conductive component and / or a non-magnetic conductive component.

[0126] In this embodiment, the magnetic isolation portion 206 between adjacent permanent magnets 204 can be set as a magnetic conductive component. Specifically, the rotor assembly 202 can include an annular iron core, and mounting grooves for mounting the permanent magnets 204 are arranged at intervals on the annular iron core. At the same time, a magnetic bridge is formed by using the body of the iron core between the mounting grooves, and this magnetic bridge is the magnetic isolation portion 206, so as to realize the spacing of adjacent permanent magnets 204. Through the above setting method, the processing technology of the rotor assembly 202 can be simplified by using the body structure of the annular iron core, the processing difficulty can be reduced, and thus the manufacturing cost of the motor 200 can be reduced.

[0127] Further, the magnetic isolation portion 206 can also include a non-magnetic conductive component, so as to effectively avoid magnetic leakage of the rotor assembly 202, and further increase the magnetic density during the operation of the motor 200, ensuring the operation effect of the motor 200.

[0128] Further, the permanent magnet 204 includes a ferrite or a rare earth permanent magnet.

[0129] Specifically, the ferrite or the rare earth permanent magnet has good magnetic energy. By using the ferrite or the rare earth permanent magnet as the permanent magnet 204 of the rotor assembly 202, it can be ensured that the permanent magnet 204 can effectively provide magnetic energy for a long time, and thus ensure the long-term stable operation of the motor 200.

[0130] In any of the above embodiments, further, the number of pole pairs of the winding 124 of the stator assembly 100 satisfies the following relational expression: Pa = ∣Ns ± Zr / 2∣; where Pa is the number of pole pairs of the winding 124 of the stator assembly 100, Ns is the total number of the first grooves 130, and Zr is the number of the magnetic isolation portions 206.

[0131] In this embodiment, by defining the number of pole pairs of the stator winding 124, the normal operation of the motor 200 is ensured. Moreover, the new harmonic components that appear in the air-gap magnetic density can be used as the working harmonics of the motor 200 to provide output torque for the motor 200, thereby effectively improving the torque density of the motor 200. Specifically, the number of pole pairs of the winding 124 of the stator assembly 100 satisfies the following relational expression: Pa = |Ns ± Zr / 2|; where Pa is the number of pole pairs of the winding 124 of the stator assembly 100, Ns is the total number of the first grooves 130, and Zr is the number of the magnetic isolation parts 206.

[0132] Specifically, at least two first auxiliary teeth 118 are provided at the end of the first tooth 106. Therefore, the first grooves 130 on the outer wall of the first stator 102 include both the first stator slots 128 between adjacent first teeth 106 and the first auxiliary stator slots 132 between adjacent first auxiliary teeth 118. That is, at this time, the number of the first grooves 130 on the outer wall of the first stator 102 is the sum of the number of the first stator slots 128 and the number of the first auxiliary stator slots 132. When no auxiliary teeth are provided at the end of the first tooth 106, the first groove 130 is the first stator slot 128 between two adjacent first teeth 106. At this time, the number of the first grooves 130 is the number of the first stator slots 128.

[0133] According to the third aspect of the present invention, an electrical device is provided, including the motor 200 in any one of the above embodiments.

[0134] The electrical device provided by the present invention includes the motor 200 in any one of the above embodiments. Therefore, by setting the stator assembly 100 of the motor 200 to a double-stator structure of the first stator 102 and the second stator 108, and arranging the rotor assembly 202 of the motor 200 between the first stator 102 and the second stator 108, while ensuring the efficiency of the operation process of the electrical device, the volume of the electrical device can be effectively reduced, which is beneficial to the miniaturized design of the electrical device.

[0135] In the description of the present invention, the term "plurality" means two or more unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention; the terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0136] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0137] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, Comprising: A first stator, the first stator includes a first yoke and at least two first teeth, the at least two first teeth are disposed on an outer wall of the first yoke, a first stator slot is formed between two adjacent first teeth, an outer wall of the first stator includes a plurality of first grooves, and the plurality of first grooves at least includes the first stator slot; A second stator, the second stator includes a second yoke and at least two second teeth, the second yoke is coaxially disposed with the first yoke and sleeved outside the first yoke, the at least two second teeth are disposed on an inner wall of the second yoke, and a rotor assembly is placed between the first stator and the second stator; The first stator slot has a slot center line in a radial direction of the first stator, the second tooth has a tooth body center line in a radial direction of the second stator, and along a rotation direction of the rotor assembly, an angle between the slot center line and the tooth body center line is greater than 0 degree and less than or equal to 72 / Ns degrees, where Ns is a number of the first grooves; The first tooth includes: A first tooth body, one end of the first tooth body is connected to the first yoke; A first tooth shoe, the first tooth shoe is connected to the other end of the first tooth body, at least two first sub-teeth are disposed at an end of the first tooth shoe away from the first tooth body, and a first sub-stator slot is included between two adjacent first sub-teeth on the same first tooth shoe, wherein, the first grooves further include the first sub-stator slot.

2. The stator assembly according to claim 1, wherein a number of the second teeth is equal to a number of the first grooves.

3. The stator assembly according to claim 1, wherein The second tooth includes: A second tooth body, one end of the second tooth body is connected to the second yoke; A second tooth shoe, the second tooth shoe is connected to the other end of the second tooth body, at least two second sub-teeth are disposed at an end of the second tooth shoe away from the second tooth body, and a second sub-stator slot is included between two adjacent second sub-teeth on the same second tooth shoe, wherein, a sum of the number of the second teeth and a number of the second sub-stator slots is equal to the number of the first grooves.

4. The stator assembly according to any one of claims 1 to 3, characterized in that, Further comprising: A winding, the winding is disposed on at least one of the first stator and the second stator.

5. The stator assembly according to claim 4, wherein the winding is disposed on the first yoke and / or the second yoke.

6. The stator assembly according to claim 4, wherein one winding is disposed on each first tooth; and / or one winding is disposed on each second tooth.

7. The stator assembly according to claim 4, wherein one winding is disposed on every two adjacent first teeth; and / or one winding is disposed on every two adjacent second teeth.

8. A motor, characterized in that, Comprising: A rotor assembly; The stator assembly according to any one of claims 1 to 7, at least a part of the rotor assembly is located between the first stator and the second stator.

9. The motor according to claim 8, wherein the rotor assembly includes a plurality of permanent magnets and a plurality of magnetic isolation parts, and the plurality of permanent magnets and the plurality of magnetic isolation parts are alternately arranged.

10. The motor according to claim 9, wherein the polarities of two adjacent permanent magnets are opposite.

11. The motor according to claim 9, wherein the magnetic isolation part includes a magnetic conductive component and / or a non-magnetic conductive component.

12. The motor according to claim 9, wherein the permanent magnet includes a ferrite or a rare earth permanent magnet.

13. The motor according to claim 9, wherein the number of pole pairs of the winding of the stator assembly satisfies the following relational expression: Pa = ∣Ns ± Zr / 2∣; wherein, Pa is the number of pole pairs of the winding of the stator assembly, Ns is the total number of the first grooves of the first stator, and Zr is the number of the magnetic isolation parts.

14. An electrical device, characterized in that, Comprising: the motor according to any one of claims 8 to 13.

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