Stator punching sheet, stator core, stator, motor and vehicle

Abstract

The utility model discloses a stator punching sheet, a stator iron core, a stator, a motor and a vehicle. The stator punching sheet comprises a punching sheet body and a separation part, and a through hole and a tooth groove which penetrate along the thickness direction of the punching sheet body are formed on the punching sheet body; the separation part is located at one end, close to the through hole, of the tooth groove, the separation part is used for separating the tooth groove and the through hole in the radial direction of the punching sheet body, at least one magnetic isolation hole is formed in the separation part, and the magnetic isolation hole penetrates through the separation part in the thickness direction of the punching sheet body. According to the stator punching sheet provided by the embodiment of the utility model, the separation part for isolating the tooth grooves from the through holes is provided with the magnetic isolation holes, the separation part can reduce stray capacitance between the stator and the rotor, magnetic leakage can be reduced, and the generation of shaft voltage can be reduced; the eddy current loss of a stator core is reduced, the efficiency of a motor using the stator punching sheet is improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a stator punching sheet, a stator iron core, a stator, a motor and a vehicle. Background Art

[0002] Due to the occasional asymmetry of the magnetic field caused by the motor manufacturing process, the influence of the inherent magnetic field imbalance of the motor, the application of PWM frequency conversion technology and the accumulation of electrostatic charge, the motor generates shaft voltage when it is working, which will break down the bearing and generate shaft current to cause damage to the motor, greatly shortening the service life of the motor. The existing technology usually avoids this by guiding or blocking the shaft current, but it has the disadvantages of increasing the cost of the motor and making the motor structure more complicated. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a stator punching sheet.

[0004] The second objective of the present utility model is to provide a stator core, comprising the stator punching sheets described in the above embodiment.

[0005] The third objective of the present utility model is to provide a stator, comprising the stator core described in the above embodiment.

[0006] The fourth objective of the present utility model is to provide a motor, comprising the stator described in the above embodiment.

[0007] A fifth objective of the present utility model is to provide a vehicle, comprising the motor described in the above embodiment.

[0008] According to the stator punching sheet of the first aspect of the utility model, the stator punching sheet comprises: a punching sheet body and a partition, wherein the punching sheet body is formed with a through hole and a tooth groove which penetrate the punching sheet body in the thickness direction; the partition is located at one end of the tooth groove close to the through hole, and the partition is used to separate the tooth groove and the through hole in the radial direction of the punching sheet body, wherein at least one magnetic isolation hole is formed on the partition, and the magnetic isolation hole penetrates the partition in the thickness direction of the punching sheet body.

[0009] According to the stator punching sheet of the embodiment of the utility model, by arranging magnetic isolation holes on the partition part that isolates the tooth slots and the through holes, the partition part can prevent the magnetic lines of force in the through holes from flowing between the tooth slots and the through holes through the magnetic isolation holes, thereby reducing the stray capacitance between the stator and the rotor, reducing the leakage magnetic field, and thus reducing the generation of shaft voltage. Arranging the magnetic isolation holes on the partition part can reduce the eddy current loss of the stator core by blocking the flow path of the eddy current of the magnetic field, thereby improving the efficiency of the motor using the stator punching sheet and increasing the service life of the motor.

[0010] In some embodiments, the punch body includes: a yoke and a plurality of teeth, wherein the plurality of teeth are arranged circumferentially along the inner circumferential wall of the yoke, a tooth groove is defined between two adjacent teeth, and the partition is disposed between two adjacent teeth.

[0011] In some embodiments, there are a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged at intervals from each other. The plurality of magnetic isolation holes include: at least one first magnetic isolation hole and at least one second magnetic isolation hole, the second magnetic isolation hole is located on a side of the first magnetic isolation hole away from the yoke, and the second magnetic isolation hole and the first magnetic isolation hole are staggered along the circumference of the yoke.

[0012] In some embodiments, the tooth grooves are parallel grooves, plow-shaped grooves, flat-bottomed grooves, or round-bottomed grooves.

[0013] In some embodiments, the partition is elliptical, circular or polygonal in shape.

[0014] In some embodiments, the punch body and the partition are integrally formed.

[0015] The stator core of the second embodiment of the utility model is formed by stacking a plurality of stator punching sheets, and the stator punching sheets are the stator punching sheets in the aforementioned embodiment.

[0016] The stator of the embodiment of the third aspect of the utility model comprises: a stator core and a stator winding. The stator core is the stator core described in the above embodiment, and the stator winding is arranged on the stator core.

[0017] The motor of the fourth embodiment of the utility model includes the stator described in the above embodiment.

[0018] The vehicle of the fifth embodiment of the utility model comprises the motor described in the above embodiment.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic diagram of a stator punching sheet according to an embodiment of the utility model.

[0022] Figure 2 yes Figure 1 Schematic diagram of the enlarged P region.

[0023] Figure 3 It is a schematic diagram of a stator punching sheet according to another embodiment of the utility model.

[0024] Figure 4 yes Figure 3 Schematic enlargement of the mid-Q region.

[0025] Figure 5 It is an equivalent circuit diagram of an embodiment of the utility model taking stray capacitance into consideration.

[0026] Reference numerals:

[0027] 1. Stator punching sheet; 2. Punching sheet body;

[0028] 10. yoke; 11. through hole;

[0029] 20. tooth portion; 21. tooth groove;

[0030] 30. Partitioning portion; 31. Magnetic isolation hole; 311. First magnetic isolation hole; 312. Second magnetic isolation hole. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 5 A stator punching sheet 1 according to an embodiment of the present utility model is described, comprising: a punching sheet body 2 and a partition 30 .

[0032] Specifically, if Figure 1-Figure 4 As shown, a through hole 11 and a tooth groove 21 are formed on the punch body 2 along the thickness direction of the punch body 2, and a partition 30 is located at one end of the tooth groove 21 close to the through hole 11. The partition 30 is used to separate the tooth groove 21 and the through hole 11 along the radial direction of the punch body 2, wherein at least one magnetic isolation hole 31 is formed on the partition 30, and the magnetic isolation hole 31 passes through the partition 30 along the thickness direction of the punch body 2.

[0033] There are multiple tooth slots 21, and the multiple tooth slots 21 are arranged at intervals along the circumference of the through hole 11. A partition 30 is provided on the side of the tooth slot 21 facing the through hole 11, and the partition 30 is connected to the two side walls of the tooth slot 21 along the circumference of the through hole 11. At least one magnetic isolation hole 31 is formed on the partition 30, and the magnetic isolation hole 31 penetrates the partition 30 along the thickness direction of the punching sheet body 2. The magnetic field generates magnetic lines of force. When the rotor is arranged in the through hole 11, the magnetic lines of force freely shuttle in the gap between the rotor and the stator. When the magnetic lines of force flow to the partition 30, the magnetic lines of force flow on both sides of the magnetic isolation hole 31 because the partition 30 is provided with the magnetic isolation hole 31, that is, the magnetic lines of force will not pass through the magnetic isolation hole 31, and the magnetic lines of force are divided at the magnetic isolation hole 31. Induction eddy currents are generated in the magnetic field. The longer the flow path of the induced eddy currents, the greater the loss. The setting of the magnetic isolation hole 31 can hinder the flow path of the induced eddy currents and reduce the eddy current loss of the stator punching sheet 1.

[0034] According to the stator punching sheet 1 of the embodiment of the utility model, by arranging the magnetic isolation hole 31 on the partition 30 that isolates the tooth slot 21 and the through hole 11, the partition 30 can prevent the magnetic lines in the through hole 11 from flowing between the tooth slot 21 and the through hole 11 through the magnetic isolation hole 31, thereby reducing the stray capacitance between the stator and the rotor, reducing the leakage magnetic flux, and thus reducing the generation of the shaft voltage. The magnetic isolation hole 31 is arranged on the partition 30, which can reduce the eddy current loss of the stator core provided with the stator punching sheet 1 by blocking the flow path of the magnetic field eddy current, thereby improving the efficiency of the motor using the stator punching sheet 1 and increasing the service life of the motor.

[0035] In some embodiments, Figure 1 and Figure 2 As shown, the punch body 2 includes a yoke 10 and a plurality of teeth 20, the plurality of teeth 20 are arranged at intervals along the circumferential direction of the inner peripheral wall of the yoke 10, and a tooth groove 21 is defined between two adjacent teeth 20. A separator 30 is connected between two adjacent teeth 20, and the separator 30 is used to separate the tooth groove 21 and the through hole 11 along the radial direction of the yoke 10.

[0036] In this embodiment, the inner peripheral wall of the yoke 10 is provided with a plurality of teeth 20 arranged in the circumferential direction, two adjacent teeth 20 define a tooth slot 21, and a partition 30 connects the two adjacent teeth 20 to block the connection between the tooth slot 21 and the through hole 11. The stator sheet 1 and the stator winding form a stator, and a magnetic field is generated when the stator is energized. The magnetic lines of force in the magnetic field flow along the radial direction of the yoke 10 and are distributed around the yoke 10. The provision of the partition 30 and the magnetic isolation hole 31 can prevent the magnetic lines of force from directly entering the tooth slot 21, so that the magnetic lines of force flow along the two ends of the partition 30 with smaller flow resistance when passing through the partition 30, which can avoid the phenomenon of magnetic leakage, reduce the generation of shaft voltage, and thus reduce the risk of electrical corrosion caused by the shaft current generated by the shaft voltage, thereby improving the service life of the motor.

[0037] At the same time, the magnetic field is more evenly distributed in the through hole 11, the structure is relatively simple, the cost is low, the tooth slot 21 effect is reduced, the torque of the tooth slot 21 is reduced, and the torque fluctuation is reduced, so that the torque output by the motor with the stator punching sheet 1 is more stable, and the vibration and noise of the motor can be reduced.

[0038] Among them, Figure 2 As shown, when the position of the partition 30 is set, the partition 30 is connected between the ends of two adjacent teeth 20 away from the yoke 10. That is, at this time, the partition 30 is connected to the end of the tooth 20 facing the through hole 11 along the radial direction of the punch body 2, so that the side surface of the partition 30 adjacent to the through hole 11 is flush with the inner wall surface of the through hole 11, and the effect of reducing stray capacitance is better.

[0039] Optionally, the partition 30 is connected between the side walls of two adjacent tooth portions 20 that are opposite to each other. That is, the partition 30 connects the two adjacent tooth portions 20 in the middle of the tooth portion 20, and at this time, the partition 30 and the two adjacent tooth portions 20 define an opening, and the opening is connected to the through hole 11. Therefore, the partition 30 is arranged between the ends or between the side walls of two adjacent tooth portions 20, which can reduce the stray capacitance between the stator winding arranged in the tooth slot 21 and the rotor in the through hole 11, reduce the shaft voltage, and extend the service life of the motor.

[0040] In some embodiments, there are multiple separators 30, and the multiple separators 30 are respectively connected between two adjacent teeth 20. Thus, the magnetic field is evenly distributed in the through hole 11, the torque of the tooth slot 21 is reduced, and the stable output of the torque is ensured.

[0041] In some optional embodiments, there is one partition 30, which is arranged at one end of the tooth portion 20 away from the yoke 10 along the radial direction of the punching sheet body 2, and the partition 30 can extend along the circumferential direction of the punching sheet body 2. The partition 30 is connected to multiple tooth portions 20 at the same time, which can simplify the manufacturing process of the stator punching sheet 1 and improve production efficiency.

[0042] In some embodiments, the shape of the partition 30 is elliptical, circular or polygonal. In this embodiment, the shape of the partition 30 can be the shape of the cross section of the partition 30 along the circumference of the yoke 10, or the shape of the cross section of the partition 30 along the radial direction of each part. That is, the shape of the partition 30 is not specifically limited here, as long as it can block the communication between the through hole 11 and the tooth groove 21.

[0043] In some embodiments, the magnetic isolation hole 31 is separated from the tooth slot 21 and the through hole 11 along the radial direction of the yoke 10; or the magnetic isolation hole 31 is connected to one of the tooth slot 21 and the through hole 11 along the radial direction of the yoke 10. That is, when the magnetic isolation hole 31 is provided on the partition 30, it can be designed as needed. For example, in this embodiment, the magnetic isolation hole 31 is spaced from the tooth slot 21 and the through hole 11 and is not connected to each other, thereby reducing the generation of shaft voltage. The magnetic isolation hole 31 being connected to one of the tooth slot 21 or the through hole 11 can refer to the magnetic isolation hole 31 being connected to the tooth slot 21 or the magnetic isolation hole 31 being connected to the through hole 11.

[0044] In some embodiments, there are multiple magnetic isolation holes 31, and the multiple magnetic isolation holes 31 are arranged at intervals from each other. Therefore, the arrangement of the multiple magnetic isolation holes 31 can achieve a more ideal magnetic isolation effect between the tooth slots 21 and the through holes 11.

[0045] Furthermore, if Figure 4As shown, the multiple magnetic isolation holes 31 include: at least one first magnetic isolation hole 311, at least one second magnetic isolation hole 312, the second magnetic isolation hole 312 is located on the side of the first magnetic isolation hole 311 away from the yoke 10, and the second magnetic isolation hole 312 and the first magnetic isolation hole 311 are staggered along the circumference of the yoke 10. In this embodiment, there are two second magnetic isolation holes 312, and the two second magnetic isolation holes 312 are spaced apart along the circumference of the yoke 10. The first magnetic isolation hole 311 is arranged between the two second magnetic isolation holes 312 and is staggered with the second magnetic isolation holes 312 along the circumference, that is, the first magnetic isolation hole 311 and the two second magnetic isolation holes 312 are distributed in a triangular shape in the partition 30, so as to reduce the flow path of the induced eddy current and reduce the influence of the eddy current field formed by the induced eddy current on the motor. In this embodiment, the number of magnetic isolation holes 31 is not limited, and can be three or more.

[0046] In some embodiments, the shape of the orthographic projection of the tooth groove 21 along the thickness direction of the yoke 10 is a parallel groove, a plow-shaped groove, a flat-bottomed groove, or a round-bottomed groove.

[0047] In some optional embodiments, the sheet body 2 and the partition 30 are an integrally formed part, that is, the yoke 10, the plurality of teeth 20 and the partition 30 are an integrally formed part. Thus, the stator sheet 1 is an integrally formed part, which can increase the structural strength of the stator sheet 1, simplify the process of forming the stator sheet 1, and improve the production efficiency of the stator sheet 1, so that the magnetic circuit in the motor is symmetrically distributed, and reduce the possibility of shaft voltage and shaft current in the motor.

[0048] The stator core of the second embodiment of the utility model is formed by stacking a plurality of stator punching sheets 1 in the above embodiment.

[0049] The stator of the embodiment of the third aspect of the utility model comprises: a stator core and a stator winding, wherein the stator core is the stator core in the above embodiment; and the stator winding is arranged on the stator core.

[0050] When the stator winding is energized, a magnetic field is generated, while the rotor winding moves in the magnetic field generated by the stator through the action of current or external magnetic field. The magnetic circuit between the stator and the rotor is connected through the interaction of magnetic fields. Specifically, when the stator winding is energized, the magnetic field formed will penetrate the stator core, that is, penetrate the stator core in the radial direction of the stator, and then enter the rotor core through the gap between the rotor and the stator. The magnetic field in the rotor core interacts with the magnetic field generated by the stator, causing the rotor winding to feel the magnetic force and generate current. In this way, a magnetic circuit is established between the stator and the rotor, through which energy can be transferred from the stator to the rotor to control the rotation output torque of the rotor.

[0051] In some embodiments, the stator winding is inserted into the tooth slot 21 of the stator core from one end in the thickness direction of the stator core. The stator winding is inserted into the tooth slot 21 along the thickness direction of the stator core, and there are multiple stator windings, and the multiple stator windings correspond to the multiple tooth slots 21. The multiple stator windings are welded at both ends of the stator axial direction, which simplifies the process of the stator winding and reduces the cost.

[0052] The motor of the fourth embodiment of the utility model includes the stator in the above embodiment.

[0053] In this embodiment, the motor includes a stator and a rotor. The rotor includes a rotor core, a rotor winding and a rotating shaft. The stator core is fixed to the inner surface of the motor housing and connected to the ground. The stator winding is fixedly installed in the tooth slot 21. The rotor core is fixedly installed on the rotating shaft. The rotating shaft winding is fixed in the slot formed by the rotor core. The rotor is installed with the housing through a mounting bracket. Specifically, the mounting bracket includes a rotating shaft frame, a bearing frame and a bearing. One end of the rotating shaft frame is connected to the inside of the stator core, and the other end of the rotating shaft frame is connected to the housing through the bearing frame. The rotating shaft is connected to the housing and the sealed end cover through the bearing, so that the rotor can rotate under the action of the magnetic field. Alternatively, the rotor winding can be replaced by a permanent magnet. The permanent magnet is placed in the rotor core and can be fixed or pasted on the surface of the rotor, so that the rotor rotates in the magnetic field.

[0054] According to the motor of the embodiment of the utility model, the structure of the internal stator punching sheet 1 is redesigned to isolate the tooth slots 21 of the stator punching sheet 1 from being connected to the through hole 11, thereby reducing the generation of shaft voltage, avoiding the shaft voltage from generating shaft current that breaks through the lubricating oil film on the bearing surface, and reducing the possibility of electrical corrosion of the bearing, so that the motor has a good service life while reducing the vibration and noise of the motor when it is working.

[0055] In addition, combined Figure 5 , an equivalent circuit diagram is designed considering the influence of stray capacitance on the motor during its use. com represents the common mode voltage, w represents the stator winding, f represents the stator punching 1, r represents the rotor and the shaft, C wf is the stray capacitance between the stator winding and stator lamination 1, C wr is the stray capacitance between the stator winding and the rotor, C rf is the stray capacitance between the rotor and the stator, C b The present application reduces the stray capacitance between the stator winding and the rotor by changing the tooth top structure of the stator punching sheet 1, thereby increasing the voltage division between points w and r in the figure and reducing C bThe voltage at both ends is reduced to achieve the purpose of reducing the shaft voltage. On the one hand, the bearing voltage is reduced, the speed of electrical corrosion of the bearing is slowed down, and the damage caused by capacitive discharge is avoided to a great extent. On the other hand, the voltage increase caused by the grounding of the rotor, shaft and transmission, including the load system, is reduced, the speed of electrical corrosion is slowed down, and the service life of the motor is extended.

[0056] The motor type is not limited to permanent magnet synchronous motors, but can also be applied to electrically excited synchronous motors, asynchronous motors or DC motors, etc.

[0057] A vehicle according to an embodiment of the fifth aspect of the utility model comprises the motor in the above embodiment.

[0058] The vehicle according to the embodiment of the utility model can reduce the cost of the vehicle and improve the safety of the vehicle.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0062] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator punching sheet, characterized in that: include: A punch body, on which a through hole and a tooth groove are formed that penetrate along the thickness direction of the punch body; A partition, the partition is located at one end of the tooth groove close to the through hole, and the partition is used to separate the tooth groove and the through hole along the radial direction of the punch body, Wherein, at least one magnetic isolation hole is formed on the partition portion, and the magnetic isolation hole penetrates the partition portion along the thickness direction of the punching sheet body.

2. The stator sheet according to claim 1, characterized in that: The punch body comprises: yoke; A plurality of tooth portions are arranged along the circumferential direction of the inner peripheral wall of the yoke portion, the tooth groove is defined between two adjacent tooth portions, and the partition portion is arranged between two adjacent tooth portions.

3. The stator sheet according to claim 2, characterized in that: There are a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged at intervals from each other. The plurality of magnetic isolation holes include: At least one first magnetic isolation hole; At least one second magnetic isolation hole is provided, wherein the second magnetic isolation hole is located on a side of the first magnetic isolation hole away from the yoke, and the second magnetic isolation hole and the first magnetic isolation hole are staggered along the circumferential direction of the yoke.

4. The stator sheet according to claim 1, characterized in that: The tooth grooves are parallel grooves, plow-shaped grooves, flat-bottomed grooves or round-bottomed grooves.

5. The stator sheet according to claim 1, characterized in that: The shape of the partition is oval, circular or polygonal.

6. The stator sheet according to any one of claims 1 to 5, characterized in that: The punch body and the partition are integrally formed.

7. A stator core, characterized in that: The stator core is formed by stacking a plurality of stator punching sheets as described in any one of claims 1 to 6.

8. A stator, characterized in that: include: A stator core, wherein the stator core is the stator core according to claim 7; The stator winding is wound on the stator core.

9. A motor, characterized in that: Comprising a stator according to claim 8.

10. A vehicle, characterized in that: Comprising an electric machine according to claim 9.

Images