Motor stator and motor

Abstract

The present invention proposes a motor stator and a motor, wherein the motor stator comprises: a plurality of stator modules spliced ​​circumferentially, the stator module comprising: an arc-shaped stator yoke; a plurality of stator teeth capable of being assembled and matched on the arc-shaped stator yoke along the circumferential direction and capable of extending toward the axis of the arc-shaped stator yoke; a stator winding circumferentially wrapped around the arc-shaped stator yoke, the stator winding capable of extending along the arc surface of the arc-shaped stator yoke away from the axis and then being wound to the arc surface area close to the axis, and capable of passing through the stator teeth, wherein a plurality of circumferentially spliced ​​stator modules are formed by splicing two adjacent arc-shaped stator yokes end to end along the circumferential direction. The technical solution of the present invention can reduce the axial size of the motor, and for electrical appliances such as washing machines, it can increase the internal capacity by saving space.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a motor stator and a motor. Background Art

[0002] For motors used in washing machines using direct drive technology, the axial dimension of the motor is required to be as small as possible so as to increase the washing capacity without increasing the size of the washing machine too much.

[0003] like Figure 1 As shown, in the related art, most direct-drive motors of washing machines use outer rotor radial flux motors. However, the outer rotor radial flux motor cannot be made thinner due to the thickness of the outer rotor 10 itself, the inevitable axial physical air gap between the outer rotor 10 and the inner stator 20, and the unavoidable winding ends. In addition, if the motor is too thick, the axial installation size will increase, and space cannot be saved to increase the capacity of the washing machine.

[0004] While transverse flux motors offer high torque density, they are complex to manufacture and expensive. Traditional transverse flux motors have a modular design along their axial direction, with each module representing a single phase and each phase's windings forming a ring. The motor's total axial length is equal to the sum of the axial lengths of all modules. This results in a relatively thick motor even when the motor is multiphase. Summary of the Invention

[0005] In order to solve at least one of the above technical problems, an object of the present invention is to provide a motor stator.

[0006] Another object of the present invention is to provide a motor.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the first aspect of the present invention proposes a motor stator, comprising: a plurality of stator modules spliced ​​along the circumferential direction, the stator module comprising: an arc-shaped stator yoke; a plurality of stator teeth, which can be assembled on the arc-shaped stator yoke along the circumferential direction and can extend toward the axis of the arc-shaped stator yoke; a stator winding, which is circumferentially wrapped around the arc-shaped stator yoke, and the stator winding can extend along the arc surface away from the axis on the arc-shaped stator yoke and then be wound to the arc surface area close to the axis, and can pass through the stator teeth, wherein a plurality of stator modules spliced ​​along the circumferential direction are formed by splicing two adjacent arc-shaped stator yokes end to end along the circumferential direction.

[0008] In this technical solution, a motor stator formed by splicing a plurality of stator modules arranged along the circumferential direction is used as the motor stator of the transverse flux motor. Each stator module includes an arc-shaped stator yoke and a plurality of stator teeth assembled on the arc-shaped stator yoke. The stator winding is wound along a circumferential contour perpendicular to the axial direction on the arc-shaped stator yoke and can pass through a plurality of stator teeth along the circumferential direction. On the one hand, the phase difference of the stator winding induced voltage on each stator module can be adjusted by adjusting the physical spacing between the stator modules, thereby obtaining a transverse flux motor with the required number of phases, such as a two-phase, three-phase, or multi-phase motor, which is different from the prior art. The stator modules are arranged axially, and the increase in the number of phases is achieved by increasing the number of stator modules (that is, increasing the axial size of the motor stator). In comparison, the axial size of the motor stator in the present application is only equivalent to the axial size of the stator of a single-phase motor in the prior art, thereby reducing the axial size of the motor. For electrical equipment such as washing machines, the internal capacity can be increased by saving space; on the other hand, the characteristic of high torque density of the transverse flux motor can be retained. On the other hand, since the stator winding is wound along the circular contour perpendicular to the axial direction on the arc-shaped stator yoke, it will not protrude from the end face of the stator yoke, which is also beneficial to the overall thinning of the motor.

[0009] The stator teeth are assembled on the arc-shaped stator yoke, which can be implemented in various forms. For example, the stator teeth and the arc-shaped stator yoke can be assembled by docking in the radial direction, or by being assembled by being sleeved on each other.

[0010] In addition, the stator winding and the stator yoke and the stator teeth can be insulated by slot paper or by an insulating frame.

[0011] In addition, the stator tooth punchings in the above technical solution provided by the present invention may also have the following additional technical features:

[0012] In the above technical solution, preferably, the stator tooth includes: a tooth waist portion; a tooth root portion, which is arranged at one end of the tooth waist portion and includes a fixing groove formed by two side wall structures extending axially along the arc-shaped stator yoke portion; a tooth claw portion, which is arranged at the other end of the tooth waist portion and extends in the same direction as the fixing groove, wherein the stator tooth is assembled with the arc-shaped stator yoke portion by inserting the arc-shaped stator yoke portion into the fixing groove.

[0013] In this technical solution, a fixing groove is opened at the root of the stator tooth, and the fixing groove cooperates with the stator yoke to realize the assembly of the stator teeth on the arc-shaped stator yoke. While meeting the assembly strength between the stator teeth and the arc-shaped stator yoke, the thickness or height of the stator yoke can be set as small as possible to meet the preparation requirements of the drive motor in electrical equipment such as washing machines.

[0014] In addition, each stator tooth may include a tooth root portion, a tooth waist portion and a tooth claw portion. Each stator tooth may include a tooth root portion, a tooth waist portion and a tooth claw portion. The tooth root portion is used to connect with the stator yoke portion, and the inner walls of the two adjacent tooth waist portions are arranged to form a winding arrangement space, and the tooth claw portion can be arranged along the circumferential direction to form a circumferential mating surface that cooperates with the motor rotor.

[0015] In any of the above technical solutions, preferably, the fixed grooves on two adjacent stator teeth are arranged in opposite directions on the arc-shaped stator yoke, so that the two adjacent stator teeth are arranged in opposite directions in the axial direction, wherein a crossing area of ​​the stator winding can be enclosed between the two adjacent stator teeth, so that the stator winding extends circumferentially along the inner side wall of the tooth waist.

[0016] In this technical solution, two adjacent stator teeth are arranged in opposite directions in the axial direction so that the two adjacent stator teeth can realize axial limitation of the stator winding. From the perspective of the entire stator module, the stator winding is wound along the outer arc surface and then wound in reverse after passing through the side wall of the end of the stator yoke. The tooth waists of the two adjacent stator teeth are respectively located on both sides of the stator winding to limit the stator winding axially. The tooth claws of the two adjacent stator teeth are used to limit the stator winding radially. Through axial limitation and radial limitation, the setting accuracy of the stator winding along the circumferential direction is guaranteed, which is beneficial to improving the performance of the motor.

[0017] In any of the above technical solutions, preferably, the stator teeth are formed by a plurality of stator tooth punchings stacked in the circumferential direction.

[0018] In this technical solution, stator teeth are formed in the form of stator tooth punching sheets, and then combined with the stator yoke structure to form a stator core structure. Compared with the transverse flux motor or claw motor with solid teeth, this can greatly reduce the core loss without increasing the cost of process improvement.

[0019] In any of the above technical solutions, preferably, the outer side wall and the inner side wall of the arc-shaped stator yoke are respectively formed by a plurality of straight surfaces spliced ​​together along the circumferential direction.

[0020] In this technical solution, the portion of the arc-shaped stator yoke that cooperates with the fixing slot is made into a straight-surface structure, so as to achieve a snug fit between the fixing slot and the stator yoke, thereby facilitating improvement of the strength of the assembled motor stator.

[0021] In any of the above technical solutions, preferably, the outer wall and the inner wall of the arc-shaped stator yoke are arc surfaces, and the area on the arc surface that cooperates with the stator teeth is recessed to form a slot structure that cooperates with the side wall of the fixing slot.

[0022] In this technical solution, a slot structure is provided on the arc-shaped stator yoke to cooperate with the two side walls of the fixed slot respectively to achieve circumferential positioning of the stator teeth, thereby improving the stability of the motor stator assembly while ensuring the assembly strength.

[0023] In any of the above technical solutions, preferably, the arc-shaped stator yoke is formed by stacking a plurality of stator yoke punching sheets in the axial direction.

[0024] In any of the above technical solutions, preferably, the cross-sectional shape of the fixing groove is configured as any one of a rectangle, a U-shape, and a trapezoid.

[0025] In this technical solution, the cross-section of the fixing slot can have a variety of structural forms and change with the change of the cross-sectional shape of the stator yoke to meet the setting requirements of different motor stator structures.

[0026] Preferably, the cross-sectional shape of the fixing groove is rectangular or trapezoidal.

[0027] In any of the above technical solutions, preferably, the length of the side wall of the fixing groove away from the tooth waist is less than or equal to the length of the side wall close to the tooth waist.

[0028] In this technical solution, the side wall away from the tooth waist is mainly used to cooperate with the stator yoke and achieve mechanical fixation. At this time, the length of the side wall away from the tooth waist can be less than or equal to the length of the side wall close to the tooth waist. By further reducing the length of the side wall away from the tooth waist to set the length of the side wall to be less than the length of the side wall close to the tooth waist, the mass of the entire motor stator can be effectively reduced.

[0029] As for the side wall close to the tooth waist, while cooperating with the side wall away from the tooth waist to form a fixing groove to achieve mechanical fixation with the stator yoke, it can transmit the magnetic lines transmitted from the tooth waist to the stator yoke. Therefore, by setting the side wall close to the tooth waist as a longer side, the probability of magnetic leakage can be effectively reduced.

[0030] In any of the above technical solutions, preferably, the thickness of the side wall of the fixing groove away from the tooth waist is less than or equal to the thickness of the side wall close to the tooth waist.

[0031] In this technical solution, by setting the thickness of the side wall of the fixing groove away from the tooth waist to be smaller than the thickness of the side wall close to the tooth waist, on the one hand, by limiting the thickness of the side wall close to the tooth waist, it is ensured that the magnetic lines transmitted from the tooth waist are transmitted to the stator yoke, and at the same time it is beneficial to reduce the probability of magnetic leakage. On the other hand, by limiting the thickness of the side wall away from the tooth waist, while meeting the strength of mechanical fixation, it is also beneficial to reduce the weight of the motor stator.

[0032] The technical solution of the second aspect of the present invention provides a motor, comprising: a motor stator as described in any technical solution of the first aspect of the present invention; and a motor rotor, which is sleeved and assembled with the motor stator, wherein the motor stator is an outer stator.

[0033] The motor is specifically a transverse flux reluctance motor.

[0034] In this technical solution, by setting the motor rotor as an inner rotor to form an inner rotor reluctance transverse flux motor, compared with an outer rotor motor, no safety gap is required, which can further reduce the overall size of the motor.

[0035] In the above technical solution, preferably, the motor rotor includes: a plurality of arc-shaped rotor yokes, which can be spliced ​​end to end along the circumferential direction to form an annular rotor yoke, a plurality of magnetic steel positioning teeth are arranged circumferentially on the outer arc side wall of the arc-shaped rotor yoke, and a magnetic steel positioning groove is defined between any two adjacent magnetic steel positioning teeth; a plurality of permanent magnets are correspondingly arranged in the magnetic steel positioning grooves and can protrude from the magnetic steel positioning grooves.

[0036] In any of the above technical solutions, preferably, for the adjacent rotor yokes, a splicing groove is provided at the tail end of one, and a splicing tooth structure capable of cooperating with the splicing groove is provided at the head end of the other.

[0037] In this technical solution, splicing grooves and splicing tooth structures are respectively provided in the mating areas of two adjacent rotor yokes, and precise positioning and assembly between two adjacent stator rotors are achieved through the coordination of the splicing grooves and the splicing tooth structures.

[0038] In any of the above technical solutions, preferably, the motor stator has n stator modules, wherein when the number of phases of the motor is m, the number of stator modules in each phase is n / m.

[0039] In this technical solution, for a motor with n stator modules, the number of phases depends on the number of modules contained in each phase. If the number of modules per phase is a, and a is an integer not less than 1, then the total number of motor phases m is n / a. When a is 1, each stator module represents one phase, and they are arranged in sequence along the circumferential direction. The spatial angle occupied by each phase is equal to the spatial angle occupied by each module, that is, 360° / n. If a is greater than 1, then when arranging in the circumferential direction, the phases are first arranged in sequence in the order of one module per phase. After arranging m windings, the previous arrangement is repeated until it is repeated a times. In order to reduce back electromotive force harmonics and torque pulsation, a and m are usually set to integers greater than 1.

[0040] One or more technical solutions provided in the technical solution of this application have at least the following technical effects or advantages:

[0041] (1) A motor stator formed by splicing a plurality of stator modules arranged along the circumferential direction is used as the motor stator of the transverse flux motor. Each stator module includes an arc-shaped stator yoke and a plurality of stator teeth assembled on the arc-shaped stator yoke. The stator winding is wound along a circumferential contour perpendicular to the axial direction on the arc-shaped stator yoke and can pass through a plurality of stator teeth along the circumferential direction. On the one hand, the phase difference of the stator winding induced voltage on each stator module can be adjusted by adjusting the physical spacing between the stator modules, thereby obtaining a transverse flux motor with a desired number of phases, such as a two-phase, three-phase, or multi-phase motor. Compared with the prior art in which the stator modules are arranged along the axial direction and the number of phases is increased by increasing the number of stator modules (i.e., increasing the axial size of the motor stator), the axial size of the motor stator in the present application is only equivalent to the axial size of the single-phase motor stator in the prior art, thereby reducing the axial size of the motor. On the other hand, the characteristic of the transverse flux motor with high torque density can be retained.

[0042] (2) By arranging two adjacent stator teeth in opposite directions along the axial direction, the two adjacent stator teeth can realize the axial limitation of the stator winding. From the perspective of the entire stator module, the stator winding is wound along the outer arc surface and then wound in the opposite direction after passing through the side wall of the end of the stator yoke. The tooth waists of the two adjacent stator teeth are respectively located on both sides of the stator winding to limit the stator winding axially. The tooth claws of the two adjacent stator teeth are used to limit the stator winding radially. Through axial limitation and radial limitation, the setting accuracy of the stator winding along the circumferential direction is guaranteed, which is beneficial to improving the performance of the motor.

[0043] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0045] Figure 1 A schematic structural diagram of a radial flux motor in the related art is shown;

[0046] Figure 2 A schematic structural diagram of a transverse flux motor according to an embodiment of the present invention is shown;

[0047] Figure 3 FIG2 shows a schematic planar structural diagram of a motor stator according to an embodiment of the present invention;

[0048] Figure 4 shows a structural schematic diagram of a stator module according to an embodiment of the present invention;

[0049] Figure 5A schematic structural diagram of a stator tooth according to an embodiment of the present invention is shown;

[0050] Figure 6 A schematic structural diagram of an arc-shaped stator yoke according to an embodiment of the present invention is shown;

[0051] Figure 7 A schematic structural diagram of an arc-shaped stator yoke according to another embodiment of the present invention is shown;

[0052] Figure 8 FIG2 shows a schematic planar structural diagram of a motor rotor according to an embodiment of the present invention.

[0053] in, Figures 1 to 8 The corresponding relationship between the reference numerals and component names is as follows:

[0054] 10 outer rotor, 20 inner stator, 30 stator module, 302 arc-shaped stator yoke, 304 stator teeth, 306 stator winding, 3042 tooth claw, 3044 tooth waist, 3046 tooth root, 3046A fixed slot, 3046B first side wall, 3046C second side wall, 3022 slot structure, 40 motor rotor, 402 rotor yoke, 404 permanent magnet. DETAILED DESCRIPTION

[0055] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0057] Refer to the following Figures 2 to 7 A stator for an electric machine according to some embodiments of the present invention is described.

[0058] like Figures 2 to 4As shown, the motor stator according to an embodiment of the present invention includes: a plurality of stator modules 30 spliced ​​along the circumferential direction, the stator module 30 includes: an arc-shaped stator yoke 302; a plurality of stator teeth 304, which can be assembled on the arc-shaped stator yoke 302 along the circumferential direction and can extend toward the axis of the arc-shaped stator yoke 302; a stator winding 306, which is circumferentially wrapped around the arc-shaped stator yoke 302, and the stator winding 306 can extend along the arc surface away from the axis on the arc-shaped stator yoke 302 and then be wound to the arc surface area close to the axis, and can pass through the stator teeth 304, wherein, by splicing two adjacent arc-shaped stator yokes 302 end to end along the circumferential direction, a plurality of stator modules 30 spliced ​​along the circumferential direction are formed.

[0059] In this embodiment, a motor stator formed by splicing a plurality of stator modules 30 arranged along the circumferential direction is used as the motor stator of the transverse flux motor. Each stator module 30 includes an arc-shaped stator yoke 302 and a plurality of stator teeth 304 assembled on the arc-shaped stator yoke 302. The stator winding 306 is wound along a circumferential profile perpendicular to the axial direction on the arc-shaped stator yoke 302 and can pass through the plurality of stator teeth 304 along the circumferential direction. On the one hand, by adjusting the physical spacing between the stator modules 30, the phase difference of the induced voltage of the stator winding 306 on each stator module 30 can be adjusted, thereby obtaining a transverse flux motor with a desired number of phases. Machine, such as a two-phase, three-phase, or multi-phase motor, compared with the prior art in which the stator modules 30 are arranged along the axial direction and the number of phases is increased by increasing the number of stator modules 30 (i.e., increasing the axial size of the motor stator), the axial size of the motor stator in the present application is only equivalent to the axial size of the stator of a single-phase motor in the prior art, thereby reducing the axial size of the motor. On the other hand, it can retain the characteristic of high torque density of the transverse flux motor. On the other hand, since the stator winding 306 is wound along the circumferential contour perpendicular to the axial direction on the arc-shaped stator yoke 302, it will not protrude from the end face of the stator yoke, which is also conducive to the overall thinning of the motor.

[0060] The stator teeth 304 are assembled on the arc-shaped stator yoke 302 , which can be implemented in various forms. For example, the stator teeth 304 and the arc-shaped stator yoke 302 can be assembled by docking in the radial direction, or by being assembled by being nested with each other.

[0061] In addition, the stator winding 306 and the stator yoke and the stator teeth 304 may be insulated by slot paper or by an insulating frame.

[0062] The stator module 30 can be prepared by using a plastic overmolding process.

[0063] In addition, the stator teeth 304 punching sheets in the above embodiment provided by the present invention may also have the following additional technical features:

[0064] like Figure 5 As shown, in the above embodiment, preferably, the stator tooth 304 includes: a tooth waist portion 3044; a tooth root portion 3046, which is arranged at one end of the tooth waist portion 3044 and includes a fixing groove 3046A formed by two side wall structures extending axially along the arc-shaped stator yoke portion 302; a tooth claw portion 3042, which is arranged at the other end of the tooth waist portion 3044 and extends in the same direction as the tooth waist portion 3044, wherein the stator tooth 304 is assembled with the arc-shaped stator yoke portion 302 by sleeved in the fixing groove 3046A.

[0065] In this embodiment, a fixing groove 3046A is opened at the root of the stator tooth 304, and the fixing groove 3046A cooperates with the stator yoke to realize the assembly of the stator tooth 304 on the arc-shaped stator yoke 302. While meeting the assembly strength between the stator tooth 304 and the arc-shaped stator yoke 302, the thickness or height of the stator yoke can be set as small as possible to meet the preparation requirements of the drive motor in electrical equipment such as washing machines.

[0066] In addition, each stator tooth 304 may include a tooth root portion 3046, a tooth waist portion 3044 and a tooth claw portion 3042. Each stator tooth 304 may include a tooth root portion 3046, a tooth waist portion 3044 and a tooth claw portion 3042. The tooth root portion 3046 is used to connect with the stator yoke portion, and the inner walls of the two adjacent tooth waist portions 3044 are enclosed to form a winding arrangement space, and the tooth claw portion 3042 can be arranged along the circumferential direction to form a circumferential mating surface that cooperates with the motor rotor 40.

[0067] like Figures 2 to 4 As shown, in any of the above embodiments, preferably, the fixing grooves 3046A on two adjacent stator teeth 304 are set in opposite directions on the arc-shaped stator yoke 302, so that the two adjacent stator teeth 304 are set in opposite directions in the axial direction, wherein a crossing area of ​​the stator winding 306 can be enclosed between the two adjacent stator teeth 304, so that the stator winding 306 extends circumferentially along the inner wall of the tooth waist 3044.

[0068] In this embodiment, two adjacent stator teeth 304 are arranged in opposite directions in the axial direction so that the two adjacent stator teeth 304 can realize axial limitation of the stator winding 306. Thus, from the perspective of the entire stator module 30, the stator winding 306 is wound along the outer arc surface and then wound in reverse after passing through the side wall of the end of the stator yoke. The tooth waists 3044 of the two adjacent stator teeth 304 are respectively located on both sides of the stator winding 306 to limit the stator winding 306 in the axial direction. The tooth claws 3042 of the two adjacent stator teeth 304 are used to limit the stator winding 306 in the radial direction. Through axial limitation and radial limitation, the setting accuracy of the stator winding 306 in the circumferential direction is guaranteed, which is beneficial to improving the performance of the motor.

[0069] like Figure 4 and Figure 5 As shown, in any of the above embodiments, preferably, the stator teeth 304 are formed by a plurality of stator tooth 304 punching sheets stacked in the circumferential direction.

[0070] In this embodiment, the stator teeth 304 are formed in the form of stator tooth 304 punching sheets, and then combined with the stator yoke structure to form a stator core structure. Compared with the transverse flux motor or claw motor using solid teeth, the core loss can be greatly reduced without increasing the process improvement cost.

[0071] like Figure 6 As shown, in any of the above embodiments, preferably, the outer side wall and the inner side wall of the arc-shaped stator yoke 302 are respectively formed by a plurality of straight surfaces spliced ​​together along the circumferential direction.

[0072] In this embodiment, the portion of the arc-shaped stator yoke 302 that cooperates with the fixing slot 3046A is formed into a straight surface structure, so as to achieve a snug fit between the fixing slot 3046A and the stator yoke, thereby facilitating improvement of the strength of the assembled motor stator.

[0073] like Figure 7 As shown, in any of the above embodiments, preferably, the outer wall and the inner wall of the arc-shaped stator yoke 302 are arc surfaces, and the area on the arc surface that cooperates with the stator teeth 304 is recessed to form a slot structure 3022 that cooperates with the side wall of the fixing slot 3046A.

[0074] In this embodiment, a slot structure 3022 is provided on the arc-shaped stator yoke 302 to respectively cooperate with the two side walls of the fixing slot 3046A to achieve circumferential positioning of the stator teeth 304, thereby improving the stability of the motor stator assembly while ensuring the assembly strength.

[0075] like Figure 6 and Figure 7 As shown, in any of the above embodiments, preferably, the arc-shaped stator yoke 302 is formed by stacking a plurality of stator yoke punching sheets in the axial direction.

[0076] In any of the above embodiments, preferably, the cross-sectional shape of the fixing groove 3046A is configured as any one of a rectangle, a U-shape, and a trapezoid.

[0077] In this embodiment, the cross-section of the fixing slot 3046A can have a variety of structural forms and change with the change of the cross-sectional shape of the stator yoke to meet the setting requirements of different motor stator structures.

[0078] Preferably, the cross-sectional shape of the fixing groove 3046A is rectangular or trapezoidal.

[0079] In any of the above embodiments, preferably, the length of the side wall of the fixing groove 3046A away from the tooth waist 3044 is less than or equal to the length of the side wall close to the tooth waist 3044 .

[0080] In this embodiment, the side wall (second side wall 3046C) away from the tooth waist 3044 is mainly used to cooperate with the stator yoke and achieve mechanical fixation. At this time, the length of the second side wall 3046C can be less than or equal to the length of the side wall (first side wall 3046B) close to the tooth waist 3044. By further reducing the length of the second side wall 3046C to set the length of the second side wall 3046C to be less than the length of the first side wall 3046B, the mass of the entire motor stator can be effectively reduced.

[0081] As for the first side wall 3046B, while cooperating with the second side wall 3046C to form a fixing groove 3046A to achieve mechanical fixation with the stator yoke, it can transmit the magnetic lines transmitted from the tooth waist 3044 to the stator yoke. Therefore, by setting the first side wall 3046B as the longer side, the probability of magnetic leakage can be effectively reduced.

[0082] In any of the above embodiments, preferably, the thickness of the side wall of the fixing groove 3046A away from the tooth waist 3044 is less than or equal to the thickness of the side wall close to the tooth waist 3044 .

[0083] In this embodiment, by setting the thickness of the second side wall 3046C to be smaller than the thickness of the first side wall 3046B, on the one hand, by limiting the thickness of the first side wall 3046B, it is ensured that the magnetic lines transmitted from the tooth waist 3044 are transmitted to the stator yoke, and at the same time it is beneficial to reduce the probability of magnetic leakage. On the other hand, by limiting the thickness of the second side wall 3046C, while meeting the strength of mechanical fixation, it is also beneficial to reduce the weight of the motor stator.

[0084] like Figure 1 and Figure 2 As shown, the motor according to the embodiment of the present invention includes: the motor stator as described in any embodiment of the first aspect of the present invention; the motor rotor 40, which is assembled with the motor stator, wherein the motor stator is an outer stator.

[0085] The motor is specifically a transverse flux reluctance motor.

[0086] In this embodiment, the motor rotor 40 is configured as an inner rotor to form an inner rotor reluctance transverse flux motor. Compared with an outer rotor motor, no safety gap is required, and the overall size of the motor can be further reduced.

[0087] like Figure 8As shown, in the above embodiment, preferably, the motor rotor 40 includes: a plurality of arc-shaped rotor yokes 402, which can be spliced ​​end to end along the circumferential direction to form an annular rotor yoke 402, a plurality of magnetic steel positioning teeth are arranged circumferentially on the outer arc side wall of the arc-shaped rotor yoke 402, and a magnetic steel positioning groove is defined between any two adjacent magnetic steel positioning teeth; a plurality of permanent magnets 404 are correspondingly arranged in the magnetic steel positioning grooves and can protrude from the magnetic steel positioning grooves.

[0088] The motor rotor 40 can also be prepared by a plastic coating process, where the plastic coating material fills the gaps between the permanent magnets, thereby reinforcing the permanent magnets and preventing them from being thrown out by centrifugal force during high-speed applications.

[0089] In any of the above embodiments, preferably, for the adjacent rotor yokes 402 , a splicing groove is provided at the tail end of one, and a splicing tooth structure capable of cooperating with the splicing groove is provided at the head end of the other.

[0090] In this embodiment, by respectively providing a splicing groove and a splicing tooth structure in the mating area of ​​two adjacent rotor yokes 402 , precise positioning and assembly between two adjacent stator rotors are achieved through the coordination of the splicing groove and the splicing tooth structure.

[0091] In any of the above embodiments, preferably, the motor stator has n stator modules, wherein when the number of phases of the motor is m, the number of stator modules in each phase is n / m.

[0092] In this embodiment, for a motor with n stator modules, the number of phases depends on the number of modules contained in each phase. If the number of modules per phase is a, and a is an integer not less than 1, then the total number of motor phases m is n / a. When a is 1, each stator module represents one phase, and they are arranged in sequence along the circumferential direction. The spatial angle occupied by each phase is equal to the spatial angle occupied by each module, that is, 360° / n. If a is greater than 1, then when arranging in the circumferential direction, the phases are first arranged in sequence in the order of one module per phase. After arranging m windings, the previous arrangement is repeated until it is repeated a times. In order to reduce back electromotive force harmonics and torque pulsation, a and m are usually set to integers greater than 1.

[0093] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0094] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0095] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0096] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor stator, characterized in that: include: A plurality of stator modules spliced ​​along the circumferential direction, wherein the stator modules include: Arc-shaped stator yoke; A plurality of stator teeth can be assembled on the arc-shaped stator yoke along a circumferential direction and can extend toward the axis of the arc-shaped stator yoke; The stator winding is circumferentially wound around the arc-shaped stator yoke. The stator winding can extend along the arc surface of the arc-shaped stator yoke away from the axis and then be wound to the arc surface area close to the axis, and can pass through the stator teeth. wherein, a plurality of stator modules spliced ​​along the circumferential direction are formed by splicing two adjacent arc-shaped stator yokes end to end along the circumferential direction; The stator teeth include: tooth waist; a tooth root portion, provided at one end of the tooth waist portion, comprising a fixing groove formed by two sidewall structures extending along the axial direction of the arc-shaped stator yoke portion; The tooth claw portion is provided at the other end of the tooth waist portion and extends in the same direction as the fixing groove. The stator teeth are assembled with the arc-shaped stator yoke by sleeve-fitting the arc-shaped stator yoke into the fixing groove; The stator winding, the arc-shaped stator yoke and the stator teeth are insulated from each other; The length of the side wall of the fixing groove away from the tooth waist is shorter than the length of the side wall close to the tooth waist; The outer side wall and the inner side wall of the arc-shaped stator yoke are arc surfaces, and the area on the arc surface that matches the stator teeth is recessed to form a slot structure that matches the side wall of the fixing slot. Wherein, the depth of the slot structure is the same as the thickness of the corresponding side wall; The claw portions of two adjacent stator teeth are used to limit the stator winding in radial direction.

2. The motor stator according to claim 1, characterized in that: The fixing grooves on two adjacent stator teeth are sleeved on the arc-shaped stator yoke in opposite directions, so that the two adjacent stator teeth are arranged in opposite directions along the axial direction. A passing area of ​​the stator winding can be formed between two adjacent stator teeth, so that the stator winding extends circumferentially along the inner side wall of the tooth waist.

3. The motor stator according to claim 1, characterized in that: The stator teeth are formed by stacking a plurality of stator tooth punching sheets in a circumferential direction.

4. The motor stator according to claim 1, characterized in that: The arc-shaped stator yoke is formed by stacking a plurality of stator yoke punching sheets in the axial direction.

5. The motor stator according to any one of claims 1 to 4, characterized in that: The cross-sectional shape of the fixing groove is configured as any one of a rectangle, a U-shape, and a trapezoid.

6. The motor stator according to any one of claims 1 to 4, characterized in that: The thickness of the side wall of the fixing groove away from the tooth waist is less than or equal to the thickness of the side wall close to the tooth waist.

7. A motor, characterized in that: include: The motor stator according to any one of claims 1 to 6; The motor rotor is assembled with the motor stator. Wherein, the motor stator is an external stator.

8. The motor according to claim 7, characterized in that The motor rotor comprises: A plurality of arc-shaped rotor yokes can be spliced ​​end to end along the circumferential direction to form an annular rotor yoke, wherein a plurality of magnetic steel positioning teeth are arranged circumferentially on the outer arc side wall of the arc-shaped rotor yoke, and a magnetic steel positioning groove is defined between any two adjacent magnetic steel positioning teeth; A plurality of permanent magnets are correspondingly arranged in the magnetic steel positioning grooves and can protrude from the magnetic steel positioning grooves.

9. The motor according to claim 8, characterized in that For two adjacent rotor yokes, a splicing groove is provided at the tail end of one, and a splicing tooth structure capable of cooperating with the splicing groove is provided at the head end of the other.

10. The motor according to claim 7, characterized in that The motor stator has n stator modules. When the number of phases of the motor is m, the number of stator modules in each phase is n / m.

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