Stator structure and assembling method thereof, sheet unit and motor

Abstract

The invention provides a stator structure and an assembling method thereof, a piece unit and a motor, the stator structure comprises multiple layers of stator pieces which are stacked in the axial direction, each layer of stator piece comprises multiple arc-shaped piece units, and the multiple piece units are spliced in the circumferential direction to form the stator piece. A gap is formed between every two adjacent sheet units of each layer of stator sheet in the circumferential direction, and a breaking joint is formed in the position of the gap of the stator sheet. The vibration condition of the stator structure in the interference assembly state can be improved, and the NVH performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator structure and an assembly method thereof, as well as a sheet unit and a motor. Background Art

[0002] The stator of the vehicle's drive motor is usually fixed in the housing of the drive motor by interference fit to transmit torque. Especially for drive motors under water cooling conditions, the interference fit can effectively conduct heat and facilitate the cooling of the drive motor.

[0003] However, the interference fit method will transfer all the electromagnetic forces generated on the stator to the housing of the drive motor. Especially at high speeds, the electromagnetic force of the stator can easily excite structural modes to form resonance and generate noise, which is not conducive to the NVH performance of the drive assembly. Summary of the invention

[0004] The purpose of the present application is to provide a stator structure and an assembly method thereof, as well as a sheet unit and a motor, which can improve the vibration of the stator structure in an interference fit state and enhance the NVH performance.

[0005] The present application provides a stator structure, comprising multiple layers of stator sheets stacked axially, each layer of the stator sheets comprising multiple arc-shaped sheet units, multiple sheet units being assembled circumferentially to form the stator sheets, a spacing being provided between two adjacent sheet units of each layer of the stator sheets in the circumferential direction, and the stator sheets forming a break at the position of the spacing.

[0006] In a specific embodiment, each of the sheet units has two end faces distributed along the circumferential direction, each of the end faces is provided with a first slot, the stator sheet has a plurality of tooth slots located radially inward and distributed along the circumferential direction, and two of the first slots oppositely arranged in two adjacent sheet units are assembled to form a part of the tooth slot.

[0007] In a specific embodiment, the tooth groove corresponding to the first groove has a radial center line, and an angle exists between the end surface and the radial center line.

[0008] In a specific embodiment, the breaks of the stator sheets in each layer are staggered in the circumferential direction from the breaks of the stator sheets in an adjacent layer.

[0009] In a specific embodiment, each of the sheet units is provided with at least one second slot on the radially outer side away from the tooth slot, the slot opening of the second slot is radially outward, and the second slot axially penetrates the sheet unit; or, each of the sheet units is provided with a through hole axially penetrating the sheet unit; after the multiple layers of the stator sheets are stacked, at least one connecting slot or an old connecting hole is formed, and a plurality of the second slots are aligned and spliced ​​along the axial direction to form the connecting slot, or a plurality of the through holes are aligned and spliced ​​along the axial direction to form the connecting hole;

[0010] The stator structure further includes a connecting member, which is embedded in the second slot or the connecting hole to connect multiple layers of the stator sheets.

[0011] In a specific embodiment, the structure of each of the sheet units is the same, and in two adjacent layers of the stator sheets, the sheet units of one layer of the stator sheets and the sheet units of the other layer of the stator sheets are arranged in opposite directions along the axial direction; each of the sheet units is provided with at least one of the second grooves or at least one of the through holes, and the second grooves or the through holes are arranged offset from the radial center line of the sheet unit.

[0012] In a specific embodiment, each of the sheet units has the same structure, two adjacent layers of the stator sheets are arranged in the same axial direction, and each of the sheet units is provided with at least two of the second slots or at least two of the through holes.

[0013] The present application also provides a method for processing a stator structure, which is used to process the stator structure described in the fifth to seventh items above, assembling a plurality of the sheet units along the circumferential direction, and leaving a spacing in the circumferential direction between two adjacent sheet units to form a first layer of stator sheets; continuing to stack the stator sheets of the first layer to form a second layer, and then stacking them in sequence until all layers of the stator sheets are stacked; embedding the connecting piece into the connecting groove or the connecting hole to connect multiple layers of the stator sheets.

[0014] In a specific embodiment, the connecting member is connected to the connecting groove or the connecting hole by at least one of the following methods: interference fit, welding, and bonding.

[0015] In a specific embodiment, each of the sheet units has the same structure; each of the sheet units is provided with at least one of the second grooves or at least one of the through holes, and the second grooves or the through holes are provided away from the radial center line of the sheet unit;

[0016] When stacking the stator sheets, the sheet units are flipped axially relative to the sheet units of the adjacent stator sheets in the lower layer, so that the sheet units of the stator sheets in this layer and the sheet units of the adjacent stator sheets in the lower layer are arranged in opposite directions in the axial direction, so that the breaks of the two adjacent layers of the stator sheets are staggered in the circumferential direction, and the second grooves or the through holes are aligned in the circumferential direction.

[0017] In a specific embodiment, each of the sheet units has the same structure, and each of the sheet units is provided with at least two of the second grooves or the through holes;

[0018] When stacking the stator sheets, the sheet units and the sheet units of the adjacent stator sheets in the lower layer are arranged in the same axial direction, the breaks of the two adjacent layers of stator sheets are staggered in the circumferential direction, and the second slots or the through holes are aligned in the circumferential direction.

[0019] The present application also provides a sheet unit, wherein a plurality of the sheet units are assembled along the circumferential direction to form a stator sheet of a stator structure, each of the sheet units having two end faces distributed along the circumferential direction, each of the end faces being provided with a first groove, the first groove of the sheet unit being used to be assembled with the first groove of another adjacent sheet unit to form a part of the tooth groove on the radial inner side of the stator sheet; a second groove is arranged on the radial outer side of the sheet unit or a through hole is arranged on the sheet unit, the slot opening of the second groove is radially outward, and the second groove or the through hole passes through the sheet unit axially.

[0020] The present application also provides a motor, comprising a housing and a stator structure located inside the housing, wherein the stator structure is any of the stator structures described above, and the stator structure is interference-pressed into the housing.

[0021] The stator structure provided in the present application is formed by assembling a plurality of sheet units together in the circumferential direction. In this way, each layer of the stator sheets of the stator structure is discontinuous in the circumferential direction and is a non-continuous circular ring. In this way, when the stator structure is installed in the housing of the motor, the gaps of the stator sheets of each layer on the stator structure can remain completely disengaged, so that the radial deformation of each layer of the stator sheets is completely released, thereby changing the mode of the stator structure, and enabling the specific modal vibration mode of the stator structure to disappear under the interference fit, thereby weakening the resonance energy of the motor and the electromagnetic force under high speed, thereby improving the NVH effect, and ensuring that the stator structure is still interference fit with the housing to maintain the effect of transmitting torque. For water-cooled motors, the water cooling effect can also be maintained due to the continued use of interference fit.

[0022] The processing method of the stator structure, the sheet unit and the motor provided in the present application have the same technical effects as those described above and will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a stator structure in an embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of a stator segment;

[0025] Figure 3 for Figure 2 A schematic diagram of the structure of a sheet unit of a stator sheet;

[0026] Figure 4 For two Figure 3A schematic diagram of the structure of the middle piece unit assembled along the circumferential direction;

[0027] Figure 5 for Figure 1 A schematic diagram of the structure after the stator structure is installed in the housing of the motor, wherein the stator structure is specifically installed in the housing of the motor by interference fit;

[0028] Figure 6 for Figure 5 A partial enlarged view of the fracture position of the middle stator structure;

[0029] Figure 7 for Figure 1 Schematic diagram of the multi-layer stator segments of the stator structure being assembled together;

[0030] Figure 8 for Figure 7 Schematic diagram of the process of connecting and fixing the multi-layer stator sheets through connecting parts.

[0031] Fig. 9 for Figure 1 Schematic diagram of noise comparison between the stator structure in the middle and the stator structure in the background technology at different speeds.

[0032] Figures 1 to 9 The reference numerals in the drawings are described as follows:

[0033] 100-stator structure; 1-stator sheet; 11-sheet unit; 11a-second slot; 11b-tooth slot; 11b1-first slot; 111-tooth portion; 1111-extended protrusion; 112-end face; 12-yoke portion; 1a-break; 10-stator sheet group; 10a-connecting slot; 10b-winding slot; 20-connector;

[0034] 200-housing. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Please refer to Figures 1 to 6 , Figure 1 A schematic diagram of a stator structure 100 in an embodiment of the present application; Figure 2 for Figure 1 A schematic structural diagram of a stator sheet 1; Figure 3 for Figure 2 A schematic structural diagram of a sheet unit 11 of the middle stator sheet 1; Figure 4 For two Figure 3 A schematic diagram of the structure of the middle piece unit 11 assembled along the circumferential direction; Figure 5 for Figure 1The schematic diagram of the structure after the stator structure 100 is installed in the housing 200 of the motor, the stator structure 100 is specifically press-fitted into the housing 200 of the motor; Figure 6 for Figure 5 A partial enlarged view of the position of the fracture 1a of the stator structure 100.

[0037] The stator structure 100 in this embodiment includes multiple layers of stator sheets 1 stacked in the axial direction. The structure of the stator sheets 1 is as follows: Figure 2 As shown, the stator sheet 1 is an annular structure, and a plurality of tooth slots 11b are arranged on the radial inner side thereof, and the plurality of tooth slots 11b are evenly distributed along the circumference of the stator sheet 1. Specifically, the stator sheet 1 includes a circular ring-shaped yoke 12, and a plurality of tooth portions 111 evenly distributed along the circumference are arranged on the radial inner side of the yoke 12, and the above-mentioned tooth slots 11b are formed between two adjacent tooth portions 111 along the circumferential direction, and the two radial ends of the tooth portion 111 are respectively a root and an end portion, and the root portion is connected to the yoke 12, and the end portion of the tooth portion 111 is closer to the center of the stator sheet 1 relative to the root portion. The tooth slots 11b of the stator sheet 1 are used to accommodate winding coils (not shown in the figure) of the stator structure 100, as shown in FIG. Figure 1 As shown, the tooth slots 11b of the multi-layer stator sheets 1 are aligned to form winding slots 10b extending in the axial direction, and the winding coils are wound along the multiple winding slots 10b. In this embodiment, the ends of the tooth portions 111 have extended protrusions 1111 on both sides of the circumferential direction, so that the tooth slots 11b formed in this way are narrowed toward the radial inner opening, thereby more reliably limiting the winding coils in the tooth slots 11b.

[0038] It is worth noting that the stator structure 100 in this embodiment includes a plurality of stator sheets 1 stacked in the axial direction. Since the plurality of stator sheets 1 are stacked in sequence in the axial direction, it can also be described that the stator structure 100 includes multiple layers of stator sheets 1. Then, each layer of stator sheets 1 in the stator structure 100 in this embodiment includes a plurality of arc-shaped sheet units 11. The structure of the sheet unit 11 can refer to Figure 3 , 4 It is understood that each sheet unit 11 includes an arc segment and a plurality of teeth 111 located radially inside the arc segment, a plurality of sheet units 11 are assembled circumferentially to form a stator sheet 1, a plurality of arc segments are assembled to form a yoke 12 of the stator sheet 1, and there is a spacing in the circumferential direction between two adjacent sheet units 11, so that the assembled stator sheet 1 forms a break 1a at the position of the spacing.

[0039] The present application defines that two sheet units 11 have a spacing in the circumferential direction, which means that two adjacent sheet units 11 are completely separated and non-contacting along the circumferential direction of the stator sheet 1. It can be defined that each sheet unit 11 has two end faces 112 distributed along the circumferential direction, and each part of the end face 112 of a sheet unit 11 in the radial direction and each part of the end face 112 of the adjacent sheet unit 11 in the radial direction have a certain spacing in the circumferential direction, that is, the stator sheet 1 is disconnected at the position of the break 1a.

[0040] It can be understood that in the initial assembly of the stator sheet 1, the multiple sheet units 11 of the stator sheet 1 are only assembled into a ring structure along the circumferential direction, but every two sheet units 11 of the stator sheet 1 are separated from each other and do not contact each other. The stator sheet 1 is not connected into an integral structure, but has multiple circumferentially distributed fractures 1a. Figure 4 , 6 understand.

[0041] It can be seen that each layer of the stator sheet 1 is formed by assembling a plurality of sheet units 11 together in the circumferential direction. Thus, each layer of the stator sheet 1 of the stator structure 100 is discontinuous in the circumferential direction and is a non-continuous annular structure. Thus, when the stator structure 100 is installed into the housing 200 of the motor in an interference fit manner, the slits 1a of the stator sheets 1 of each layer of the stator structure 100 can remain completely disengaged, such as Figure 5 As shown, the radial deformation of each layer of stator sheet 1 caused by interference fit can be completely released at the position of the break 1a, thereby changing the mode of the stator structure 100, enabling the specific modal vibration shape of the stator structure 100 to disappear under interference fit, weakening the resonance energy of the motor and electromagnetic force at high speed, thereby improving the NVH (Noise, Vibration, Harshness, noise, vibration, comfort) effect. In other words, the stator structure 100 in this embodiment can still adopt an interference fit with the motor housing 200 to maintain the effect of transmitting torque. For water-cooled motors, the water cooling effect can also be maintained due to the continued use of interference fit.

[0042] Please continue to refer to Figure 3 , 4 In this embodiment, each sheet unit 11 of the stator sheet 1 has two end faces 112 distributed along the circumferential direction, and each end face 112 is provided with a first slot 11b1. The slot opening of the first slot 11b1 is opposite to the slot opening of the adjacent sheet unit 11, and the first slot 11b1 passes through the sheet unit 11 in the axial direction. Figure 3 It can be seen that the first groove 11b1 is U-shaped in cross section. In this way, after the two sheet units 11 are assembled in the circumferential direction, the two first grooves 11b1 arranged opposite to each other of the two adjacent sheet units 11 are assembled to form a part of the tooth groove 11b. Since there is a gap between the two end faces 112, at the position of the first groove 11b1, the two first grooves 11b1 and the gap arranged at intervals together serve as the tooth groove 11b. In this way, the tooth groove 11b of each sheet unit 11 is actually a part of the fracture 1a, and can also be combined with Figure 6 It is understood that the break 1a is divided into two parts in the radial direction, the part close to the radial outer side is a gap opened in the yoke 12, and the other part is a tooth slot 11b. In this way, there is no need to set a gap in the tooth portion 111 of the stator sheet 1, that is, the break 1a is not located in the tooth portion 111, which is conducive to maintaining the strength and other structural properties of the stator sheet 1.

[0043] Look again Figure 3 , there is an angle α between the end face 112 of the sheet unit 11 and the radial center line L of the tooth slot 11b corresponding to the first slot 11b1, that is, the width of the first slot 11b1 along the circumferential direction is less than half of the width of the tooth slot 11b in the width direction. If the end faces 112 of the two sheet units 11 are in contact, the width of the slot structure formed by the two first slots 11b1 will be smaller than the tooth slot 11b. In this embodiment, the two end faces 112 are arranged at a certain distance in the circumferential direction. At this time, the part of the slit 1a at the tooth slot 11b position is actually the gap formed by the two end faces 112 being arranged at a certain distance and the two first slots 11b1 are assembled together to form the tooth slot 11b, so that the tooth slot 11b at the slit 1a position maintains the same size as the tooth slot 11b at other positions, that is, the structural size of the tooth portion 111 of the stator sheet 1 does not need to be changed, but a gap is added to the yoke 12, which is convenient for assembly and conducive to the uniformity of the performance of the stator sheet 1. It can be seen that if the circumferential width of the first groove 11b1 is equal to half of the width of the tooth groove 11b at other positions, the width of the tooth groove 11b at the break 1a position will be greater than the width of the tooth groove 11b at other positions. This setting is also acceptable.

[0044] It can be understood that the angle α here is positively correlated with the width of the slit 1a between the two sheet units 11. In order to ensure that the slit 1a can better meet the above-mentioned radial deformation when the stator sheet 1 is released and pressed into the housing 200, the angle α can be set to be greater than 1°, and the circumferential width of the slit 1a corresponding to the yoke 12 can be greater than 0.3 mm. Of course, the angle α and the corresponding slit 1a of the yoke 12 should not be too large to avoid affecting the performance of the stator sheet 1. The specific angle value of the angle α and the width of the slit 1a at the yoke 12 can be set according to actual needs.

[0045] In addition, in this embodiment, the number of the sheet units 11 of the stator sheet 1 can be set to three or more than three to ensure the weakening effect on the structural resonance. Figure 2 The middle stator sheet 1 includes three sheet units 11, but theoretically, as long as more than one sheet unit 11 is provided so that each layer of stator sheets 1 of the stator structure 100 has a circumferential break 1a, a certain effect of weakening structural resonance can be achieved. Therefore, the present application does not impose any specific restriction on the number of sheet units 11 of each layer of stator sheets 1.

[0046] In this embodiment, the break 1a of each layer of stator sheets 1 and the break 1a of the adjacent layer of stator sheets 1 can be arranged to be staggered in the circumferential direction, such as Figure 1As shown, from top to bottom, the slits 1a of the uppermost stator sheet 1 and the slits 1a of the middle layer are staggered in the circumferential direction, the slits 1a of the middle layer and the slits 1a of the lowermost stator sheet 1 are staggered in the circumferential direction, and the slits 1a of the uppermost stator sheet 1 and the slits 1a of the lowermost stator sheet 1 can be staggered in the circumferential direction, or as shown in FIG. Figure 1 This arrangement can avoid the multiple slits 1a of the stator structure 100 being aligned at one position in the circumferential direction to form an opening extending in the axial direction. It can be seen that the staggered arrangement is more conducive to ensuring the strength of the stator structure 100.

[0047] As mentioned above, each layer of stator sheets 1 is discontinuous in the circumferential direction. Thus, after the multiple layers of stator sheets 1 are stacked together, the stator structure 100 is not connected as a whole. Therefore, it is necessary to connect multiple sheet units 11 together. The method adopted in this embodiment is to connect multiple sheet units 11 through a connector 20.

[0048] For details, please refer to Figure 2 , and combined with Figure 7 , 8 understand, Figure 7 for Figure 1 A schematic diagram of the stator structure 100 in which multiple layers of stator sheets 1 are assembled together, wherein the multiple layers of stator sheets 1 are stacked to form Figure 7 The stator plate group 10 shown; Figure 8 for Figure 7 Schematic diagram of the process of connecting and fixing the middle multi-layer stator sheets 1 through the connecting piece 20, and forming Figure 1 The stator structure 100.

[0049] In this embodiment, each sheet unit 11 is provided with at least one second slot 11a on the radial outer side away from the tooth slot 11b, the slot opening of the second slot 11a is radially outward, and the second slot 11a penetrates the sheet unit 11 in the axial direction; the structure after the multi-layer stator sheets 1 are stacked is defined as a stator sheet group 10, and the stacked stator sheet group 10 forms at least one connecting slot 10a, and the multiple second slots 11a are aligned in the circumferential direction, that is, they are located in one position in the circumferential direction, but because the multiple second slots 11a are distributed in the axial direction, they can be aligned and spliced ​​in the axial direction to form a connecting slot 10a, such as Figure 7 As shown, each sheet unit 11 is provided with a second slot 11a, and each layer of stator sheets 1 has three second slots 11a. The second slots 11a of multiple layers of stator sheets 1 are aligned and spliced ​​to form three circumferentially distributed connecting slots 10a, and the connecting slots 10a penetrate the stator sheets 1 in the axial direction. Figure 8As shown, the stator structure 100 further includes a connector 20, which is embedded in the connection slot 10a. The number of the connectors 20 corresponds to the number of the connection slots 10a, and a total of three connectors 20 are provided. The connector 20 is exemplarily a columnar structure. The connector 20 is embedded in the connection slot 10a to connect multiple sheet units 11 together, preventing the sheet units 11 from rotating circumferentially and causing the fracture 1a to increase or decrease. The connector 20 and the connection slot 10a can be interference fit, or can be fixed together with the wall of the connection slot 10a by welding or bonding.

[0050] It can be seen that the connection method between the multi-layer stator sheets 1 is not limited to this, for example, the connecting member 20 is not provided, but they are bonded together, or the connecting member 20 is provided and bonded at the same time, etc. The connecting member 20 is provided here to prevent the sheet unit 11 from rotating circumferentially, thereby keeping the break 1a unchanged, or the change amount is very small, so as to ensure that the effect of weakening the structural resonance is fully exerted.

[0051] In this embodiment, the multiple second slots 11a of the stator structure 100 can be aligned to form an axially extending connecting slot 10a for the connector 20 to be embedded. It is known that the present invention is not limited to the slot structure. For example, a through hole (not shown) can be provided on each sheet unit 11. The through hole is provided at a position of the sheet unit 11 corresponding to the yoke 12. The multiple through holes are aligned axially to form a connecting hole that axially passes through the stator structure 100. The fastener can be inserted into the connecting hole. The fastener can be the columnar structure mentioned above, or a bolt or other structure. It can be understood that the second slot 11a is provided on the sheet unit 11, which has lower requirements on dimensional deviation during alignment and is more conducive to the insertion of the connector 20. Figure 7 As shown, the second groove 11a in this embodiment is rectangular, the formed connecting groove 10a is a rectangular groove, and the connecting member 20 is a columnar structure with a corresponding rectangular cross-section. It can be seen that the second groove 11a or the through hole can also be other shapes, such as semicircular, or it can also be a trapezoidal structure to form a wedge-shaped connecting groove 10a or connecting hole that is smaller on the outside and larger on the inside in the radial direction. The connecting member 20 is a structure corresponding to the shape of the connecting groove 10a or the connecting hole, and the insertion connection is more reliable.

[0052] In a specific implementation, the structure of each sheet unit 11 can be set to be the same. In this case, in two adjacent stator sheets 1, the sheet unit 11 of one stator sheet 1 and the sheet unit 11 of the other stator sheet 1 are set in opposite directions along the axial direction, that is, one stator sheet 1 can be flipped along the axial direction to obtain the position state of the other stator sheet 1. Each sheet unit 11 is provided with a second slot 11a or a through hole, and the second slot 11a or the through hole is set to deviate from the radial center line of the sheet unit 11, that is, the second slot 11a or the through hole is not located at the center position of the sheet unit 11 in the circumferential direction. In this way, after the sheet unit 11 is flipped, the circumferential position of the second slot 11a or the through hole will deviate and will not be aligned with the position of the break 1a. In other words, if the break 1a after flipping is aligned with the break 1a before flipping in the circumferential direction, the second slot 11a or the through hole will be staggered. If the break 1a after flipping is staggered with the break 1a before flipping in the circumferential direction, the second slot 11a or the through hole can be aligned.

[0053] Specifically, the two surfaces of the sheet unit 11 distributed along the axial direction are defined as the first surface and the second surface. The structure of each sheet unit 11 is the same and each sheet unit 11 is only provided with one second slot 11a or through hole. When stacked along the axial direction, the up and down direction is defined as the axial direction. If the first surface of each sheet unit 11 faces upward, if the breaks 1a of the multiple layers of stator sheets 1 are staggered in the circumferential direction, the second slots 11a or through holes of the adjacent layers of stator sheets 1 will also be staggered synchronously. In this way, they cannot be aligned to form connecting slots 10a or connecting holes. The solution of this embodiment is that the sheet unit 11 of one layer of stator sheets 1 has the first surface facing upward, and the sheet unit 11 of another layer of stator sheets 1 adjacent thereto is flipped along the axial direction so that its second surface faces upward. At this time, when the breaks 1a of the two adjacent layers of stator sheets 1 are aligned in the circumferential direction, the second slots 11a or the through holes are staggered. In this way, the breaks 1a can be staggered and the second slots 11a or the through holes can be aligned by rotating one of the two adjacent layers of stator sheets 1 along the circumferential direction by a certain angle, thereby simultaneously satisfying the staggered breaks 1a and the alignment of the second slots 11a or the through holes, and each sheet unit 11 can have the same structure, which is convenient for processing.

[0054] It can be understood that the multiple sheet units 11 in each layer of stator sheets 1 are separated from each other, so each layer of stator sheets 1 does not need to be rotated relative to the adjacent layer when assembled. When stacking the stator sheets 1, the sheet units 11 are flipped axially relative to the sheet units 11 of the adjacent stator sheets 1 in the lower layer, so that the sheet units 11 of the stator sheets 1 in this layer and the sheet units 11 of the adjacent stator sheets 1 in the lower layer are arranged in opposite directions in the axial direction, so that the second slots 11a or through holes of the two adjacent layers of stator sheets 1 are aligned in the axial direction, and the circumferential staggering of the slits 1a can be synchronously achieved.

[0055] When the sheet units 11 have the same structure, other methods may also be used to simultaneously satisfy the staggered breaks 1a and the alignment of the second grooves 11a or through holes.

[0056] For example, each sheet unit 11 has the same structure, and two adjacent stator sheets 1 are arranged in the same direction along the axial direction, that is, the sheet units 11 in the multi-layer stator sheets 1 all have the first surface facing upward or the second surface facing upward. At this time, each sheet unit 11 can be provided with at least two second slots 11a or at least two through holes, so that when the break 1a is staggered, one second slot 11a or through hole can be aligned with the second slot 11a or through hole of the previous layer, and the other second slot 11a or through hole can be aligned with the second slot 11a or through hole of the next layer.

[0057] In this embodiment, when stacking the stator sheets 1, the sheet units 11 and the sheet units 11 of the lower adjacent stator sheets 1 are arranged in the same axial direction, and the breaks 1a of the two adjacent layers of stator sheets 1 are staggered in the circumferential direction, and the second slots 11a or through holes are aligned in the axial direction.

[0058] It can be seen that the above embodiment only needs to set one second slot 11a or through hole, which is simpler to process and more conducive to ensuring the structural strength of the sheet unit 11. Of course, whether it is the first stacking method of flipping in the opposite direction along the axial direction or the second stacking method of stacking in the same direction along the axial direction, the sheet unit 11 can also be provided with more second slots 11a or through holes, and by flipping in the axial direction or rotating in the circumferential direction, the second slots 11a or through holes of two adjacent layers of stator sheets 1 are aligned in the axial direction, and the slits 1a are staggered in the circumferential direction. More second slots 11a or through holes can form more connecting slots 10a or connecting holes, that is, the number of connecting slots 10a or connecting holes can be greater than the number of sheet units 11 of each layer of stator sheets 1.

[0059] It should be understood that the stator structure 100 in this embodiment mainly forms a slit 1a in the circumferential direction of each layer of stator sheets 1 to release the radial deformation generated when the stator sheets 1 are in interference fit with the housing 200, and then eliminate the modal vibration shape under the interference fit, so there is no need to make specific restrictions on whether the structures of the sheet units 11 are the same. For example, two structures of sheet units 11 are provided, and the positions of the second slots 11a or through holes of the two sheet units 11 are different in the circumferential direction. If the sheet units 11 of two adjacent layers of stator sheets 1 use different structures, the slits 1a can be staggered and the second slots 11a or through holes can be aligned. However, it is obvious that only one structure of sheet units 11 is provided, which is more convenient for processing and assembly.

[0060] The present application also provides a processing method of a stator structure 100, which is used to process the stator structure 100 in the above embodiment, specifically: assembling a plurality of sheet units 11 along the circumferential direction, and leaving a spacing in the circumferential direction between two adjacent sheet units 11, to form a first layer of stator sheets 1; continuing to stack the stator sheets 1 on the first layer to form a second layer of stator sheets 1, and then stacking them in sequence until all layers of stator sheets 1 are stacked; embedding the connecting piece 20 into the second slot 11a or the through hole, connecting multiple layers of stator sheets 1, to form the stator structure 100.

[0061] This embodiment also provides a motor, including a housing 200 and a stator structure 100 located therein, wherein the stator structure 100 is the stator structure 100 described in any of the above embodiments, and the stator structure 100 is press-fitted into the housing 200. The motor has the same technical effects as the above stator structure 100, and will not be described in detail. The motor can be a drive motor for a new energy electric vehicle, and the motor can be a water-cooled motor.

[0062] In this embodiment, the Figure 1 After the stator structure 100 is assembled into the housing 200 , it has a significant weakening effect on the structural modal resonance caused by the electromagnetic force at high speed.

[0063] like Fig. 9 As shown, Fig. 9 for Figure 1 Schematic diagram of noise comparison between the stator structure 100 and the stator structure in the background art at different speeds, wherein the horizontal axis is the speed of the motor in rpm, and the vertical axis is the sound pressure SPL (sound pressure level) in dB (A). The stator sheet of the stator structure in the background art is a continuous ring structure. Fig. 9 The darker color A curve represents the solution of the background technology, and the lighter color B curve represents the solution of the embodiment of the present application. Fig. 9 It can be seen that in the low and medium speed range (0-7000rpm), the noise of the stator structures of the two structures is roughly the same, while in the high speed range (above 7000rpm), the noise optimization effect of the stator structure 100 in this embodiment is more than 5dB, and the optimization effect is more obvious.

[0064] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A stator structure, characterized in that: It comprises multiple layers of stator sheets stacked in the axial direction, each layer of the stator sheets comprises multiple arc-shaped sheet units, multiple sheet units are assembled in the circumferential direction to form the stator sheets, there is a spacing between two adjacent sheet units in each layer of the stator sheets in the circumferential direction, and the stator sheets form a break at the position of the spacing.

2. The stator structure according to claim 1, characterized in that: Each of the sheet units has two end faces distributed along the circumferential direction, each of the end faces is provided with a first slot, the stator sheet has a plurality of tooth slots located radially inward and distributed along the circumferential direction, and two of the first slots oppositely arranged in two adjacent sheet units are assembled to form a part of the tooth slot.

3. The stator structure according to claim 2, characterized in that: The tooth groove corresponding to the first groove has a radial center line, and an angle exists between the end surface and the radial center line.

4. The stator structure according to any one of claims 1 to 3, characterized in that: The breaks of the stator sheets in each layer are staggered from the breaks of the stator sheets in the adjacent layer in the circumferential direction.

5. The stator structure according to claim 4, characterized in that: Each of the sheet units is provided with at least one second slot on the radial outer side away from the tooth slot, the slot opening of the second slot is radially outward, and the second slot axially penetrates the sheet unit; or, each of the sheet units is provided with a through hole axially penetrating the sheet unit; after the multiple layers of the stator sheets are stacked, at least one connecting slot or old connecting hole is formed, and a plurality of the second slots are aligned and spliced ​​along the axial direction to form the connecting slot, or a plurality of the through holes are aligned and spliced ​​along the axial direction to form the connecting hole; The stator structure further includes a connecting member, which is embedded in the second slot or the connecting hole to connect multiple layers of the stator sheets.

6. The stator structure according to claim 5, characterized in that: Each of the sheet units has the same structure. In two adjacent layers of the stator sheets, the sheet units of one layer of the stator sheets and the sheet units of the other layer of the stator sheets are arranged in opposite directions along the axial direction. Each of the sheet units is provided with at least one of the second grooves or at least one of the through holes, and the second grooves or the through holes are arranged offset from the radial center line of the sheet unit.

7. The stator structure according to claim 5, characterized in that: Each of the sheet units has the same structure, two adjacent layers of the stator sheets are arranged in the same axial direction, and each of the sheet units is provided with at least two of the second slots or at least two of the through holes.

8. A method for processing a stator structure, used for processing the stator structure according to any one of claims 5 to 7, characterized in that: A plurality of the sheet units are assembled in the circumferential direction, and a spacing is left between two adjacent sheet units in the circumferential direction to form a first layer of stator sheets; the stator sheets of the second layer are stacked on the stator sheets of the first layer, and then stacked in sequence until all layers of the stator sheets are stacked; the connecting piece is embedded in the connecting groove or the connecting hole to connect multiple layers of the stator sheets.

9. The method for processing a stator structure according to claim 8, characterized in that: The connecting member is connected to the connecting groove or the connecting hole by at least one of the following methods: interference fit, welding and bonding.

10. The method for machining a stator structure according to claim 8, characterized in that: Each of the sheet units has the same structure; each of the sheet units is provided with at least one of the second grooves or at least one of the through holes, and the second grooves or the through holes are provided away from the radial center line of the sheet unit; When stacking the stator sheets, the sheet units are flipped axially relative to the sheet units of the adjacent stator sheets in the lower layer, so that the sheet units of the stator sheets in this layer and the sheet units of the adjacent stator sheets in the lower layer are arranged in opposite directions in the axial direction, so that the breaks of the two adjacent layers of the stator sheets are staggered in the circumferential direction, and the second grooves or the through holes are aligned in the circumferential direction.

11. The method for machining a stator structure according to claim 8, characterized in that: Each of the sheet units has the same structure, and each of the sheet units is provided with at least two of the second grooves or the through holes; When stacking the stator sheets, the sheet units and the sheet units of the adjacent stator sheets in the lower layer are arranged in the same axial direction, the breaks of the two adjacent layers of stator sheets are staggered in the circumferential direction, and the second slots or the through holes are aligned in the circumferential direction.

12. A sheet unit, wherein a plurality of said sheet units are assembled in the circumferential direction to form a stator sheet of a stator structure, characterized in that: Each of the sheet units has two end faces distributed along the circumferential direction, and each of the end faces is provided with a first groove, and the first groove of the sheet unit is used to be assembled with the first groove of another adjacent sheet unit to form a part of the tooth groove on the radial inner side of the stator sheet; the sheet unit is provided with a second groove on the radial outer side or the sheet unit is provided with a through hole, the slot opening of the second groove is radially outward, and the second groove or the through hole passes through the sheet unit in the axial direction.

13. A motor, comprising a housing and a stator structure located inside the housing, characterized in that: The stator structure is the stator structure according to any one of claims 1 to 7, and the stator structure is interference-pressed into the housing.

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