Motor, power assembly and electric vehicle
By designing multiple protrusions and insulating layers to protect the rotor punches in the magnetic steel holes, avoiding the conduction between the magnetic steel and the rotor core, the problem of eddy current loss in the built-in permanent magnet motor of magnetic steel is solved and the motor efficiency is improved and performance, and reduce maintenance costs.
Patent Information
- Application Number
- CN202411266579.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-01-03
AI Technical Summary
In a magnetic steel built-in permanent magnet motor, the conduction of the magnet with the rotor core leads to an increase in eddy current loss, reducing the motor efficiency.
Magnetic steel holes with multiple protrusions are designed, the protrusions are arranged axially in the motor, and an insulating layer is added to the surface of each rotor punch to prevent the magnetic steel from conducting with the rotor punch, and at the same time, the rotor without protrusions is used. The punching plate provides elastic recovery force to ensure the stability and firmness of the magnet.
It effectively reduces the eddy current loss of the rotor core, improves motor efficiency and performance, reduces maintenance costs, and simplifies the assembly process.
Smart Images
Figure CN119253894A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electric vehicles, and in particular to a motor, a powertrain and an electric vehicle. Background Art
[0002] With the development of electric vehicle technology, the demand for the speed and performance of electric motors is constantly increasing. Permanent magnet motors with built-in magnets have higher power density and weak magnetic field speed expansion capability, so permanent magnet motors with built-in magnets are widely used in electric vehicles.
[0003] In a permanent magnet motor with built-in magnet, the magnet is set in the magnet hole of the motor rotor core. In the prior art, the magnet can be fixed by multiple springs set in the magnet hole. However, in the process of inserting the magnet into the magnet hole, the springs easily scratch the insulating layer on the surface of the magnet, making the magnet and the rotor core conductive, causing serious eddy current loss of the rotor core, and thus reducing the motor efficiency. Summary of the invention
[0004] The present application provides a motor, a power assembly and an electric vehicle, wherein the motor can avoid conduction between the magnetic steel and the rotor core, thereby reducing the eddy current loss of the rotor core and improving the motor efficiency.
[0005] In a first aspect, a motor is provided, wherein the rotor of the motor comprises a plurality of rotor cores, each of which comprises a plurality of rotor punchings, and the plurality of rotor punchings in each rotor core are arranged adjacent to each other in the axial direction of the motor. Each rotor core comprises a motor shaft hole and a plurality of magnetic steel holes, and the plurality of magnetic steel holes in each rotor core are arranged around a motor shaft hole. Each magnetic steel hole comprises two side hole walls, and one or more magnetic steels contained in each magnetic steel hole are arranged between the two side hole walls. One side surface of one or more magnetic steels faces one side hole wall, and the other side surface of one or more magnetic steels faces the other side hole wall. Among them, at least one magnetic steel hole also comprises a plurality of protrusions, and the plurality of protrusions in the same magnetic steel hole are distributed on the same side hole wall and are used to contact the same side surface of one or more magnetic steels, and the plurality of protrusions in the same magnetic steel hole are distributed on a plurality of rotor punchings arranged at intervals along the axial direction of the motor.
[0006] Since the multiple protrusions in the same magnetic steel hole are distributed on the multiple rotor punchings arranged at intervals along the axial direction of the motor, and the surface of each rotor punching is protected by an insulating layer, when one or more magnetic steels are inserted into the magnetic steel hole with multiple protrusions, the protrusions can abut the same side surfaces of one or more magnetic steels. Even if the protrusions scratch the insulating layer on the surface of the magnetic steel, there will be no conduction between the magnetic steel and each rotor punching, thereby reducing the eddy current loss of the rotor core and improving the efficiency of the motor.
[0007] In one implementation, the multiple protrusions in a magnetic steel hole are divided into two groups of protrusions, the two groups of protrusions are arranged at intervals, and the arrangement directions of the two groups of protrusions, the arrangement directions of the hole walls on both sides, and the motor axis are perpendicular to each other.
[0008] The contact area between the multiple protrusions in the magnetic steel hole and the same side surface of one or more magnetic steels along the arrangement direction of the two groups of protrusions is large, which can prevent the one or more magnetic steels in the magnetic steel hole from rotating along the axial direction of the motor. In this way, during the operation of the motor, the stability of the one or more magnetic steels in the magnetic steel hole is high, which improves the performance of the motor and reduces the maintenance cost of the motor.
[0009] In one implementation, a rotor punch without protrusions is arranged between each protrusion-distributed rotor punch of one of the two groups of protrusions and a protrusion-distributed rotor punch of the other group of protrusions.
[0010] That is, the number of rotor punchings without protrusions arranged between each protrusion of one group of protrusions and one protrusion of another group of protrusions is one. In this way, the contact area between the multiple protrusions in the magnetic steel hole along the axial direction of the motor and the same side surface of one or more magnetic steels is large, increasing the contact force of the multiple protrusions in the same magnetic steel hole on the one or more magnetic steels. Furthermore, during the operation of the motor, the firmness of the one or more magnetic steels in the magnetic steel hole is high, which improves the performance of the motor and reduces the maintenance cost of the motor.
[0011] In addition, during the process of inserting the magnet into the magnet hole of the rotor core along the axial direction of the motor, the presence of the rotor punching sheet without protrusions can provide a larger space for each protrusion to elastically deform along the direction of the magnet being inserted into the magnet hole of the rotor core, so that each protrusion provides an elastic restoring force to the magnet and abuts against the magnet, and then the magnet is inserted into the magnet hole of the rotor core.
[0012] In one implementation, each group of protrusions is aligned along the axial direction of the motor.
[0013] In this way, the positions where each group of protrusions in the same magnetic steel hole along the motor axis abut against the magnetic steel are almost in a straight line, and the contact force of each group of protrusions in the same magnetic steel hole along the motor axis on the magnetic steel is relatively uniform, which can prevent one or more magnetic steels in the magnetic steel hole from rotating in a direction perpendicular to the motor axis. Furthermore, during the operation of the motor, the stability of one or more magnetic steels in the magnetic steel hole is further improved, the performance of the motor is further improved, and the maintenance cost of the motor is further reduced.
[0014] In one implementation, the number of the two groups of protrusions is equal, so that the dynamic unbalance of the rotor of the motor can be reduced, thereby reducing the cycle and cost of dynamic balancing correction.
[0015] In one implementation, the interval between the two groups of protrusions along the arrangement direction of the two groups of protrusions is smaller than the size of one or more magnetic steels accommodated in one magnetic steel hole.
[0016] In this way, along the arrangement direction of the hole walls on both sides of the magnetic steel hole, multiple protrusions in the same magnetic steel hole can contact each magnetic steel in the same magnetic steel hole.
[0017] In one implementation, another magnetic steel hole is arranged on a side of a magnetic steel hole away from a motor shaft hole, the number of multiple protrusions of the other magnetic steel hole is equal to the number of a group of protrusions of one magnetic steel hole, and the multiple rotor punchings distributed on the multiple protrusions of the other magnetic steel hole are the same as the multiple rotor punchings distributed on the group of protrusions of one magnetic steel hole.
[0018] In this way, a group of protrusions in one magnetic steel hole of the rotor core and multiple protrusions in another magnetic steel hole are processed on the same rotor punching in the rotor core, which not only simplifies the processing technology of the rotor punching, but also simplifies the assembly process of the rotor punching into the rotor core.
[0019] In one implementation, the multiple protrusions of the other magnetic steel hole are aligned along the axial direction of the motor. In this way, the positions where the multiple protrusions in the other magnetic steel hole abut against the magnetic steel along the axial direction of the motor are almost in a straight line, and the contact force of the multiple protrusions in the other magnetic steel hole on the magnetic steel along the axial direction of the motor is relatively uniform, which can prevent the magnetic steel in the other magnetic steel hole from rotating in a direction perpendicular to the axial direction of the motor.
[0020] In one implementation, the two magnetic steel holes are symmetrically distributed along the circumference of the motor, and the multiple protrusions of one of the two magnetic steel holes and the multiple protrusions of the other magnetic steel hole are distributed on multiple rotor punchings arranged at intervals along the axial direction of the motor.
[0021] In this way, the multiple protrusions in the two magnetic steel holes symmetrically distributed along the circumferential direction in the rotor core are all processed on the same rotor punching in the rotor core, which can not only simplify the processing technology of the rotor punching, but also simplify the assembly process of the rotor punching into the rotor core.
[0022] In one implementation, each protrusion of a magnetic steel hole is symmetrically distributed with a protrusion of another magnetic steel hole along the circumference of the motor. In this way, the mass of each rotor core can be ensured to be relatively uniform, thereby reducing the dynamic unbalance of the motor rotor and reducing the cycle and cost of dynamic balance correction.
[0023] In one implementation, a protrusion of one of the two magnetic steel holes and a protrusion of the other magnetic steel hole are symmetrically distributed along the circumference of the motor, and a protrusion of one magnetic steel hole and a protrusion of the other magnetic steel hole are distributed on the same rotor punching among a plurality of rotor punchings arranged at intervals along the axial direction of the motor. In this way, the quality of each rotor punching can be made more uniform, and thus the quality of each rotor core can be made more uniform.
[0024] In one implementation, a protrusion of one of the two magnetic steel holes and a protrusion of the other magnetic steel hole are symmetrically distributed along the circumference of the motor, and a protrusion of one of the magnetic steel holes and a protrusion of the other magnetic steel hole are distributed in two different rotor punchings among a plurality of rotor punchings arranged at intervals along the axial direction of the motor. In this way, even if the quality of each rotor punching is uneven, the quality of each rotor core can be ensured to be relatively uniform.
[0025] In one implementation, multiple protrusions in the same magnetic steel hole are distributed on one side hole wall of the two side hole walls, and the interval between each of the multiple protrusions in the same magnetic steel hole and the other side hole wall of the two side hole walls along the arrangement direction of the two side hole walls is smaller than the size of each magnetic steel.
[0026] In this way, when the magnet is inserted into the magnet hole along the axial direction of the motor, each protrusion in the magnet hole can bend and deform elastically along the axial direction of the motor along the direction of the magnet insertion into the magnet hole, thereby providing elastic restoring force for the magnet and abutting the magnet, so that the magnet is inserted into the magnet hole of the rotor core, increasing the firmness and stability of one or more magnets in the magnet hole. At the same time, it also simplifies the assembly process of the magnet and the rotor core.
[0027] In one implementation, the size of each protrusion along the arrangement direction of the hole walls on both sides is equal, so that the abutment force of each protrusion on the magnetic steel in the same magnetic steel hole is equal.
[0028] In one implementation, the size of each protrusion along the arrangement direction of the hole walls on both sides is smaller than the size of each magnetic steel, so that the magnetic steel can be fixed without affecting the performance of the motor.
[0029] In a second aspect, a power assembly is provided, which includes a reducer and a motor as described in any one of the first aspect and any possible implementation of the first aspect, wherein a motor shaft of the motor is drivingly connected to an input shaft of the reducer.
[0030] Since the motor provided by the first aspect has higher efficiency, higher performance and lower maintenance cost, the powertrain provided by the second aspect also has higher efficiency, higher performance and lower maintenance cost.
[0031] In a third aspect, an electric vehicle is provided, comprising wheels, a transmission mechanism, and the powertrain as described in the second aspect, wherein the powertrain drives the wheels through the transmission mechanism.
[0032] Since the powertrain provided by the second aspect has high efficiency, high performance, and low maintenance cost, the electric vehicle provided by the third aspect has high efficiency, high performance, and low maintenance cost.
[0033] Figure 1 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application.
[0034] Figure 2 A schematic diagram of the structure of a rotor of an electric motor provided in an embodiment of the present application.
[0035] Figure 3 A schematic diagram of the partial structure of a rotor core provided in an embodiment of the present application.
[0036] Figure 4 This is a schematic diagram of the structure of a rotor core along the axial direction of a motor provided in an embodiment of the present application.
[0037] Figure 5 This is a schematic diagram of the structure of a rotor of a motor along the axial direction of the motor provided in an embodiment of the present application.
[0038] Figure 6 for Figure 3 An enlarged schematic diagram of part A of the rotor core described in .
[0039] Figure 7 for Figure 3 An enlarged schematic diagram of part B of the rotor core described in FIG.
[0040] Figures 8 to 21 They are respectively schematic diagrams of the structures of the rotor punching sheets provided in the embodiments of the present application. DETAILED DESCRIPTION
[0041] The technical solution in this application will be described below in conjunction with the accompanying drawings.
[0042] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.
[0043] The terms "upper", "lower", "inside", "outside", etc. in the embodiments of the present application 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 application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0044] References to "some embodiments" and the like described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in some embodiments" and the like appearing in different places in this specification do not necessarily all refer to the same embodiment, but rather mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.
[0045] The "equal" in this application is not equal to the strict sense, but is within the tolerance range. The "parallel" is not parallel to the strict sense, but is within the tolerance range. The "perpendicular" is not perpendicular to the strict sense, but is within the tolerance range.
[0046] In the embodiments of the present application, the same reference numerals represent the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings as an example. For other identical parts or components, the reference numerals are also applicable. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.
[0047] An embodiment of the present application provides a motor, wherein the rotor of the motor includes a plurality of rotor cores, each of which includes a plurality of rotor punchings, and the plurality of rotor punchings in each rotor core are arranged adjacent to each other in sequence along the axial direction of the motor. Each rotor core includes a motor shaft hole and a plurality of magnetic steel holes, and the plurality of magnetic steel holes in each rotor core are arranged around a motor shaft hole. Each magnetic steel hole includes two side hole walls, and one or more magnetic steels accommodated in each magnetic steel hole are arranged between the two side hole walls. One side surface of one or more magnetic steels faces one side hole wall, and the other side surface of one or more magnetic steels faces the other side hole wall. Among them, at least one magnetic steel hole also includes a plurality of protrusions, and the plurality of protrusions in the same magnetic steel hole are distributed on the same side hole wall and are used to contact the same side surface of one or more magnetic steels, and the plurality of protrusions in the same magnetic steel hole are distributed on a plurality of rotor punchings arranged at intervals along the axial direction of the motor.
[0048] Since the multiple protrusions in the same magnetic steel hole are distributed on the multiple rotor punchings arranged at intervals along the axial direction of the motor, and the surface of each rotor punching is protected by an insulating layer, when one or more magnetic steels are inserted into the magnetic steel hole with multiple protrusions, the protrusions can abut the same side surfaces of one or more magnetic steels. Even if the protrusions scratch the insulating layer on the surface of the magnetic steel, there will be no conduction between the magnetic steel and each rotor punching, thereby reducing the eddy current loss of the rotor core and improving the efficiency of the motor.
[0049] The present application also provides an electric vehicle. Figure 1 The electric vehicle provided in the embodiment of the present application is first described in detail.
[0050] Figure 1 The following is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes one or more powertrains 10, a battery pack 20 and wheels 30. The powertrain 10 is used to receive power from the battery pack 20, convert the electrical energy into mechanical energy and drive the wheels 30 to rotate.
[0051] The powertrain 10 includes a motor and a reducer. The reducer is connected to the motor in a transmission manner. The reducer is used to connect the motor to the wheel 30 in a transmission manner.
[0052] The electric vehicles provided in the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, extended-range electric vehicles, plug-in hybrid electric vehicles or new energy vehicles, etc. Among them, pure electric vehicles are also called pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. Hybrid electric vehicles are also called hybrid electric vehicles, or simply HEV. Extended-range electric vehicles are also called range extended electric vehicles, or simply REEV. Plug-in hybrid electric vehicles are also called plug-in hybrid electric vehicles, or simply PHEV. New energy vehicles are also called new energy vehicles, or simply NEV.
[0053] In some embodiments, the powertrain 10 further includes a controller for controlling the start or stop, forward or reverse rotation, speed increase or decrease, drive torque increase or decrease, brake torque increase or decrease, etc. of the motor.
[0054] The motor includes a motor shaft, a rotor and a stator. The motor shaft passes through the shaft hole of the rotor and is in driving connection with the rotor. The rotor passes through the shaft hole of the stator and rotates in the rotating magnetic field generated by the stator to realize the conversion of electrical energy into mechanical energy.
[0055] Combine the following Figures 2 to 21 The structure of the rotor provided in the embodiment of the present application is described in detail.
[0056] like Figure 2 As shown, the rotor 100 includes a plurality of rotor cores 110, and the plurality of rotor cores 110 are arranged adjacent to each other in sequence along the axial direction of the motor. Figure 3 As shown, each rotor core 110 includes a motor shaft hole O and a plurality of magnetic steel holes 111, and the plurality of magnetic steel holes 111 in each rotor core 110 are arranged around the motor shaft hole O. The motor shaft holes O of the plurality of rotor cores 110 are connected along the motor axial direction to form the shaft hole of the rotor 100, and the plurality of magnetic steel holes 111 of the plurality of rotor cores 110 are connected along the motor axial direction to form a plurality of magnetic steel slots of the rotor 100, and the plurality of magnetic steel slots of the rotor 100 are arranged around the shaft hole of the rotor 100.
[0057] The structure of the multiple magnetic steel holes 111 of each rotor core 110 is described in detail below.
[0058] like Figure 3 and Figure 4 As shown, each magnetic steel hole 111 includes four side hole walls T1-T4, wherein two side hole walls T1-T2 are arranged opposite to each other along a first direction, and the other two side hole walls T3-T4 are arranged opposite to each other along a second direction.
[0059] In some embodiments, the first direction, the second direction, and the motor axis are perpendicular to each other.
[0060] It should be noted that the first direction can be understood as the height direction of the magnetic steel hole 111, the second direction can be understood as the width direction of the magnetic steel hole 111, and the motor axial direction can be understood as the length direction of the magnetic steel hole 111. In addition, the first direction and the second direction are both relative to the position of a magnetic steel hole 111. For different magnetic steel holes 111, the first direction and the second direction may be different. For example, Figure 3 and Figure 4 As shown, relative to the magnetic steel hole 111a, the first direction is parallel to the x1 direction, and the second direction is parallel to the y1 direction. Figure 3 and Figure 4 As shown, relative to the magnetic steel hole 111b, the first direction is parallel to the x2 direction, and the second direction is parallel to the y2 direction.
[0061] The plurality of magnetic steel holes 111 are divided into a plurality of groups, and the number of the plurality of magnetic steel holes 111 is a multiple of the number of the plurality of groups of magnetic steel holes.
[0062] For example, Figure 3 and Figure 4As shown, each group of magnetic steel holes W includes four magnetic steel holes 111a-111d, and the four magnetic steel holes 111a-111d are arranged in two layers along the radial direction of the motor, that is, two magnetic steel holes 111a-111b are in one layer, and the other two magnetic steel holes 111c-111d are in another layer, and the other two magnetic steel holes 111c-111d are arranged between the two magnetic steel holes 111a-111b and the outer peripheral surface of the rotor core 110 along the radial direction of the motor. The two magnetic steel holes 111a-111b are arranged symmetrically in a "V" shape along the circumferential direction of the motor, and the other two magnetic steel holes 111c-111d are also arranged symmetrically in a "V" shape along the circumferential direction of the motor.
[0063] For another example, each group of magnetic steel holes includes only two magnetic steel holes, and the two magnetic steel holes are as follows: Figure 3 or Figure 4 The magnetic steel holes 111a and 111b are shown. The structures of the magnetic steel holes 111a and 111b are as described above and will not be repeated here.
[0064] like Figure 2 As shown, the rotor 100 further includes a plurality of magnetic steels 120, and each magnetic steel slot of the rotor 100 is used to accommodate one or more magnetic steels 120. In other words, each magnetic steel hole 111 of each rotor core 110 is used to accommodate one or more magnetic steels 120. Figure 5 As shown, each magnetic steel 120 includes four side surfaces E1-E4, two side surfaces E1-E2 are arranged opposite to each other along the first direction, and the other two side surfaces E3-E4 are arranged opposite to each other along the second direction. In addition, one or more magnetic steels 120 accommodated in each magnetic steel hole 111 are arranged between the two side hole walls T1-T2 of each magnetic steel hole 111. In this way, the surface E1 of the magnetic steel 120 faces the hole wall T1 of the magnetic steel hole 111, the surface E2 of the magnetic steel 120 faces the hole wall T2 of the magnetic steel hole 111, and the surface of the magnetic steel 120. There is a gap between the surface E3 of the magnetic steel 120 and the hole wall T3 of the magnetic steel hole 111, and there is a gap between the surface E4 of the magnetic steel 120 and the hole wall T4 of the magnetic steel hole 111. The two gaps can be filled with magnetic isolation material or air.
[0065] In some embodiments, the plurality of magnetic steels 120 are divided into two specifications, and the widths of the two specifications of magnetic steels are inconsistent. In this way, each magnetic steel hole 111 is used to accommodate only one magnetic steel 120, and the wider magnetic steel hole 111 is used to accommodate the wider magnetic steel 120, and the narrower magnetic steel hole 111 is used to accommodate the narrower magnetic steel 120. In this embodiment, the number of magnetic steels 120 is equal to the number of magnetic steel holes 111.
[0066] In some embodiments, the plurality of magnetic steels 120 are of the same specification. For example, the narrower magnetic steel hole 111 is used to accommodate only one magnetic steel 120, and the wider magnetic steel hole 111 is used to accommodate multiple magnetic steels 120. The plurality of magnetic steels 120 of the same specification are glued together along the width direction of the magnetic steel 120 to form the plurality of magnetic steels 120 accommodated in the wider magnetic steel hole 111. In this embodiment, the number of magnetic steels 120 is greater than the number of magnetic steel holes 111.
[0067] It should be noted that the height direction of the magnetic steel 120 can be understood as the first direction, the width direction of the magnetic steel 120 can be understood as the second direction, and the length direction of the magnetic steel 120 can be understood as the axial direction of the motor.
[0068] At least one magnetic steel hole 111 further includes a plurality of protrusions P, and the plurality of protrusions P in the same magnetic steel hole 111 are distributed on the same side hole wall of the magnetic steel hole 111. In other words, only one side hole wall of the same magnetic steel hole 111 is provided with a plurality of protrusions P. For example, Figure 5 As shown, only one side hole wall T1 of the magnetic steel hole 111a is distributed with a plurality of protrusions P. Moreover, the plurality of protrusions P in the same magnetic steel hole 111 are used to contact the same side surface of one or more magnetic steels 120. For example, Figure 5 As shown, the multiple protrusions P of the magnetic steel hole 111a are used to contact the surface E1 of one or more magnetic steels 120. In addition, each rotor core 110 includes multiple rotor punchings arranged in sequence along the axial direction of the motor, and each rotor core 110 has multiple rotor punchings. The multiple protrusions P in the same magnetic steel hole 111 are distributed on multiple rotor punchings arranged at intervals along the axial direction of the motor. For example, Figure 6 As shown, the plurality of protrusions P in the magnetic steel hole 111a are distributed on a plurality of rotor punchings arranged at intervals along the axial direction of the motor. Figure 7 As shown, the multiple protrusions P in the magnetic steel hole 111c are distributed on multiple rotor punchings arranged at intervals along the axial direction of the motor.
[0069] In the motor provided in the embodiment of the present application, since the multiple protrusions P in the same magnetic steel hole are distributed on the multiple rotor punchings arranged at intervals along the axial direction of the motor, and the surface of each rotor punching is protected by an insulating layer, when one or more magnetic steels are inserted into the magnetic steel hole 111 having the multiple protrusions P, the protrusions P can abut against the same side surfaces E1 of one or more magnetic steels. Even if the protrusions P scratch the insulating layer on the surface E1 of the magnetic steel 120, there will be no conduction between the magnetic steel 120 and each rotor punching, thereby reducing the eddy current loss of the rotor core 110 and improving the efficiency of the motor.
[0070] In some embodiments, such as Figure 6 and Figure 7As shown, the multiple protrusions P in each magnetic steel hole 111 are distributed on the hole wall T1 located at the bottom along the gravity direction in the hole walls T1-T2 on both sides of the magnetic steel hole 111. In this way, under the action of gravity, the protrusions P can always provide contact force for the magnetic steel 120 to fix the magnetic steel 120.
[0071] In some embodiments, the interval between each protrusion P of the plurality of protrusions P in the same magnetic steel hole 111 along the first direction and the hole wall T2 of the magnetic steel hole 111 is smaller than the size of each magnetic steel 120 .
[0072] In this way, when the magnet 120 is inserted into the magnet hole 111 along the axial direction of the motor, each protrusion P in the magnet hole 111 can bend and deform elastically along the axial direction of the motor along the direction in which the magnet 120 is inserted into the magnet hole 111, thereby providing elastic restoring force for the magnet 120 and abutting against the magnet 120, so that the magnet 120 is inserted into the magnet hole 111 of the rotor core 110, thereby increasing the firmness and stability of one or more magnets 120 in the magnet hole 111. At the same time, the assembly process of the magnet 120 and the rotor core 110 is simplified.
[0073] In some embodiments, the size of each protrusion P along the first direction is equal. In this way, the contact force of each protrusion P on the magnetic steel in the same magnetic steel hole 111 is equal.
[0074] In some embodiments, the size of each protrusion P along the first direction is smaller than the size of each magnetic steel 120. In this way, the magnetic steel 120 can be fixed without affecting the performance of the motor.
[0075] In some embodiments, such as Figure 6 As shown, the multiple protrusions P in the magnetic steel hole 111a are divided into two groups of protrusions P1-P2, and the two groups of protrusions P1-P2 are arranged alternately along the second direction. In this way, the contact area between the multiple protrusions P in the magnetic steel hole 111 and the same side surface E1 of one or more magnetic steels 120 along the second direction is large, which can prevent the one or more magnetic steels 120 in the magnetic steel hole 111 from rotating along the axial direction of the motor. During the operation of the motor, the stability of the one or more magnetic steels 120 in the magnetic steel hole 111 is high, which improves the performance of the motor and reduces the maintenance cost of the motor.
[0076] In some embodiments, such as Figure 6 As shown, a rotor punch without protrusions is arranged between each rotor punch with protrusions P1 of one group of protrusions P1-P2 and a rotor punch with protrusions P2 of the other group of protrusions P2. In the embodiment of the present application, each rotor punch with protrusions P1 and a rotor punch with protrusions P2 of the other group of protrusions P2 can be referred to as rotor punches with protrusions.
[0077] That is, the number of rotor punchings without protrusions arranged between each protrusion P1 of one group of protrusions P1 and one protrusion P2 of another group of protrusions P2 is one. In this way, the contact area between the multiple protrusions P in the magnetic steel hole 111 along the axial direction of the motor and the same side surface E1 of one or more magnetic steels 120 is large, which increases the contact force of the multiple protrusions P in the same magnetic steel hole 111 on the one or more magnetic steels 120. Furthermore, during the operation of the motor, the firmness of the one or more magnetic steels 120 in the magnetic steel hole 111 is high, which improves the performance of the motor and reduces the maintenance cost of the motor.
[0078] In addition, during the process of inserting the magnet 120 into the magnet hole 111 of the rotor core 110 along the axial direction of the motor, due to the existence of the rotor punching sheet without protrusions, a larger space can be provided for each protrusion P to elastically deform along the direction in which the magnet 120 is inserted into the magnet hole 111 of the rotor core 110, so that each protrusion P provides an elastic restoring force to the magnet 120 and abuts against the magnet, and then the magnet 120 is inserted into the magnet hole of the rotor core.
[0079] It should be noted that the rotor punching without protrusions involved in the embodiment of the present application refers to the rotor punching without the protrusions P mentioned above in the magnetic steel hole 111. In addition to the protrusions P mentioned above, the rotor punching without protrusions may be provided with other protrusions.
[0080] In one embodiment, a rotor sheet L3 without protrusions is arranged between each rotor sheet L1 with protrusions and a rotor sheet L2 with protrusions. For another example, in one embodiment, a rotor sheet L5 without protrusions is arranged between each rotor sheet L4 with protrusions and a rotor sheet L2 with protrusions. In one embodiment, a rotor sheet M3 without protrusions is arranged between each rotor sheet M1 with protrusions and a rotor sheet M2 with protrusions. In one embodiment, a rotor sheet M3 without protrusions is arranged between each rotor sheet M4 with protrusions and a rotor sheet M5 with protrusions. In one embodiment, a rotor sheet M3 without protrusions is arranged between each rotor sheet M6 with protrusions and a rotor sheet M7 with protrusions. In one embodiment, a rotor sheet M3 without protrusions is arranged between each rotor sheet M8 with protrusions and a rotor sheet M9 with protrusions.
[0081] In some embodiments, each group of protrusions is aligned along the motor axis. Figure 6As shown, one group of protrusions P1 are aligned along the motor axis, and another group of protrusions P2 are aligned along the motor axis. In this way, the positions where each group of protrusions in the same magnetic steel hole 111 along the motor axis abut against the magnetic steel 120 are almost in a straight line, and the contact force of each group of protrusions in the same magnetic steel hole 111 along the motor axis on the magnetic steel 120 is relatively uniform, which can prevent one or more magnetic steels 120 in the magnetic steel hole 111 from rotating in a direction perpendicular to the motor axis. Furthermore, during the operation of the motor, the stability of one or more magnetic steels 120 in the magnetic steel hole 111 is further improved, the performance of the motor is further improved, and the maintenance cost of the motor is further reduced.
[0082] In one embodiment, the number of protrusions in the two groups is equal. Figure 6 As shown, the number of protrusions P1 included in one group of protrusions P1 is equal to the number of protrusions P2 included in another group of protrusions P2. In this way, the dynamic unbalance amount of the rotor 100 can be reduced, thereby reducing the cycle and cost of dynamic balance correction.
[0083] In one embodiment, the interval between the two groups of protrusions P1-P2 along the second direction is smaller than the size of one or more magnetic steels 120 accommodated in the magnetic steel hole 111. In this way, the multiple protrusions P in the same magnetic steel hole 111 along the first direction can contact each magnetic steel 120 in the same magnetic steel hole 111.
[0084] Before describing the relationship between the protrusions P in each magnetic steel hole 111 of each group of magnetic steel holes W of the rotor core 110, Figures 8 to 21 The rotor core 110 provided in the embodiment of the present application is first described in detail.
[0085] In one embodiment, each group of magnetic steel holes W of the rotor core 110 includes only two magnetic steel holes, namely, magnetic steel hole 111a and magnetic steel hole 111b. In one embodiment, each group of magnetic steel holes W of the rotor core 110 includes two other magnetic steel holes, namely, magnetic steel hole 111c and magnetic steel hole 111d, in addition to magnetic steel hole 111a and magnetic steel hole 111b.
[0086] In one embodiment, the rotor core 110 includes: Figure 8 The rotor punching L1 shown in FIG. Fig. 9 The rotor punching L2 shown and Fig.10The rotor punching L3 shown in the figure has a rotor punching L3 arranged between each rotor punching L1 and a rotor punching L2, and the rotor punching L3 is a rotor punching without a protrusion. Along the axial direction of the motor, the through hole H1 of the rotor punching L1, the through hole H1 of the rotor punching L3, and the through hole H1 of the rotor punching L2 are connected to form a part of the magnetic steel hole 111a, and along the axial direction of the motor, the through hole H2 of the rotor punching L1, the through hole H2 of the rotor punching L2, and the through hole H2 of the rotor punching L3 are connected to form a part of the magnetic steel hole 111b.
[0087] In one embodiment, the rotor core 110 includes: Fig.11 The rotor punching L4 shown in FIG. Fig.12 The rotor punching L5 shown and Fig.10 In the rotor punching L3 shown, a rotor punching L3 is arranged between each rotor punching L4 and a rotor punching L5. Along the axial direction of the motor, the through hole H1 of the rotor punching L4, the through hole H1 of the rotor punching L3, and the through hole H1 of the rotor punching L5 are connected to form a part of the magnetic steel hole 111a, and along the axial direction of the motor, the through hole H2 of the rotor punching L4, the through hole H2 of the rotor punching L3, and the through hole H2 of the rotor punching L5 are connected to form a part of the magnetic steel hole 111b.
[0088] In one embodiment, the rotor core 110 includes: Fig.13 The rotor punching M1 shown in FIG. Fig.14 The rotor punching M2 shown and Fig.15 The rotor punching M3 shown in the figure has a rotor punching M3 arranged between each rotor punching M1 and a rotor punching M2, and the rotor punching M3 is a rotor punching without a protrusion. Along the axial direction of the motor, the through hole H1 of the rotor punching M1, the through hole H1 of the rotor punching M3, and the through hole H1 of the rotor punching M2 are connected to form a part of the magnetic steel hole 111a, along the axial direction of the motor, the through hole H2 of the rotor punching M1, the through hole H2 of the rotor punching M2, and the through hole H2 of the rotor punching M3 are connected to form a part of the magnetic steel hole 111b, along the axial direction of the motor, the through hole H3 of the rotor punching M1, the through hole H3 of the rotor punching M3, and the through hole H3 of the rotor punching M2 are connected to form a part of the magnetic steel hole 111c, and along the axial direction of the motor, the through hole H4 of the rotor punching M1, the through hole H4 of the rotor punching M2, and the through hole H4 of the rotor punching M3 are connected to form a part of the magnetic steel hole 111d.
[0089] In one embodiment, the rotor core 110 includes: Fig.16 The rotor punching M4 shown, Fig.17 The rotor punching M5 shown and Fig.15In the rotor punching M3 shown, a rotor punching M3 is arranged between each rotor punching M4 and a rotor punching M5. Along the axial direction of the motor, the through hole H1 of the rotor punching M4, the through hole H1 of the rotor punching M3, and the through hole H1 of the rotor punching M5 are connected to form a part of the magnetic steel hole 111a. Along the axial direction of the motor, the through hole H2 of the rotor punching M4, the through hole H2 of the rotor punching M5, and the through hole H2 of the rotor punching M3 are connected to form a part of the magnetic steel hole 111b. Along the axial direction of the motor, the through hole H3 of the rotor punching M4, the through hole H3 of the rotor punching M3, and the through hole H3 of the rotor punching M5 are connected to form a part of the magnetic steel hole 111c. Along the axial direction of the motor, the through hole H4 of the rotor punching M4, the through hole H4 of the rotor punching M5, and the through hole H4 of the rotor punching M3 are connected to form a part of the magnetic steel hole 111d.
[0090] In one embodiment, the rotor core 110 includes: Fig.18 The rotor punching M6 shown, Fig.19 The rotor punching M7 shown and Fig.15 In the rotor sheet M3 shown, a rotor sheet M3 is arranged between each rotor sheet M6 and a rotor sheet M7. Along the axial direction of the motor, the through hole H1 of the rotor sheet M6, the through hole H1 of the rotor sheet M3, and the through hole H1 of the rotor sheet M7 are connected to form a part of the magnetic steel hole 111a. Along the axial direction of the motor, the through hole H2 of the rotor sheet M6, the through hole H2 of the rotor sheet M7, and the through hole H2 of the rotor sheet M3 are connected to form a part of the magnetic steel hole 111b. Along the axial direction of the motor, the through hole H3 of the rotor sheet M6, the through hole H3 of the rotor sheet M3, and the through hole H3 of the rotor sheet M7 are connected to form a part of the magnetic steel hole 111c. Along the axial direction of the motor, the through hole H4 of the rotor sheet M6, the through hole H4 of the rotor sheet M7, and the through hole H4 of the rotor sheet M3 are connected to form a part of the magnetic steel hole 111d.
[0091] In one embodiment, the rotor core 110 includes: Fig. 20 The rotor punching M8 shown, Fig. 20 The rotor punching M9 shown and Fig.15 The rotor punching M3 shown in the figure has a rotor punching M3 arranged between each rotor punching M8 and a rotor punching M9. Along the axial direction of the motor, the through hole H1 of the rotor punching M8, the through hole H1 of the rotor punching M3, and the through hole H1 of the rotor punching M9 are connected to form a part of the magnetic steel hole 111a. Along the axial direction of the motor, the through hole H2 of the rotor punching M8, the through hole H2 of the rotor punching M9, and the through hole H2 of the rotor punching M3 are connected to form a part of the magnetic steel hole 111b. Along the axial direction of the motor, the through hole H3 of the rotor punching M8, the through hole H3 of the rotor punching M3, and the through hole H3 of the rotor punching M9 are connected to form a part of the magnetic steel hole 111c. Along the axial direction of the motor, the through hole H4 of the rotor punching M8, the through hole H4 of the rotor punching M9, and the through hole H4 of the rotor punching M3 are connected to form a part of the magnetic steel hole 111d.
[0092] In one embodiment, at least one of the rotor punchings at both ends of the rotor core 110 along the axial direction of the motor is a rotor punching L3. In this way, after the protrusions P in the magnetic steel holes 111 of the rotor core 110 are elastically deformed, they will not extend out of the end of the rotor core 110 along the axial direction of the motor, thereby ensuring the flatness of the end surface of the rotor core 110.
[0093] In one embodiment, at least one of the rotor punchings at both ends of the rotor core 110 along the axial direction of the motor is a rotor punching M3. In this way, after the protrusions P in the magnetic steel holes 111 of the rotor core 110 are elastically deformed, they will not extend out of the end of the rotor core 110 along the axial direction of the motor, thereby ensuring the flatness of the end surface of the rotor core 110.
[0094] During the process of inserting the magnet 120 into the magnet hole 111 of the rotor core 110 along the axial direction of the motor, the rotor punching L3 or the rotor punching M3 provides a larger space for each protrusion P to elastically deform along the direction in which the magnet 120 is inserted into the magnet hole 111 of the rotor core 110, so that each protrusion P provides an elastic restoring force to the magnet 120 and abuts against the magnet 120, and then the magnet 120 is inserted into the magnet hole 111 of the rotor core 110.
[0095] In one embodiment, the magnetic steel holes 111a and the magnetic steel holes 111b are symmetrically distributed along the circumferential direction of the motor, and the multiple protrusions P of the magnetic steel holes 111a and the multiple protrusions P of the magnetic steel holes 111b are distributed on multiple rotor punchings arranged at intervals along the axial direction of the motor. In other words, the multiple protrusions P of the magnetic steel holes 111a are also distributed on multiple rotor punchings arranged at intervals along the axial direction of the motor, and the multiple rotor punchings on which the multiple protrusions P of the magnetic steel holes 111a are distributed are the same as the multiple rotor punchings on which the multiple protrusions P of the magnetic steel holes 111b are distributed.
[0096] In this way, the multiple protrusions in the two magnetic steel holes 111 symmetrically distributed along the circumferential direction in the rotor core 110 are all processed on the same rotor punching in the rotor core 110, which can not only simplify the processing technology of the rotor punching, but also simplify the assembly process of the rotor punching into the rotor core 110.
[0097] In one embodiment, each protrusion P of the magnetic steel hole 111a along the circumference of the motor is symmetrically distributed with a protrusion P of the magnetic steel hole 111b. In this way, the mass of each rotor core 110 can be ensured to be relatively uniform, thereby reducing the dynamic unbalance of the rotor of the motor and reducing the cycle and cost of dynamic balance correction.
[0098] In one embodiment, the protrusions P of the magnetic steel holes 111a and the protrusions P of the magnetic steel holes 111b that are symmetrically distributed along the circumference of the motor are distributed on the same rotor punching. In this way, the quality of the rotor punching L1 and the quality of the rotor punching L2 can be ensured to be relatively uniform. Furthermore, the dynamic unbalance of the rotor 100 can be reduced to a small extent, and the cycle and cost of dynamic balance correction can be reduced.
[0099] In one embodiment, one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a is distributed as follows: Figure 8 On the hole wall of the through hole H1 of the rotor punching L1 shown in the figure, one of the protrusions P1 of the group of protrusions P1 of the magnetic steel hole 111b is distributed as follows: Figure 8 On the hole wall of the through hole H2 of the rotor punching L1 shown in the figure, a protrusion P1 on the hole wall of the through hole H1 of the rotor punching L1 is symmetrically distributed with a protrusion P1 on the hole wall of the through hole H2 of the rotor punching L1 along the circumference of the motor. One protrusion P2 of another group of protrusions P2 of the magnetic steel hole 111a is distributed as follows Fig. 9 On the hole wall of the through hole H1 of the rotor punching L2 shown in the figure, one of the protrusions P2 in another group of protrusions P2 of the magnetic steel hole 111b is distributed as follows: Fig. 9 On the hole wall of the through hole H2 of the rotor punching L2 shown, a protrusion P2 on the hole wall of the through hole H1 of the rotor punching L2 is symmetrically distributed with a protrusion P2 on the hole wall of the through hole H2 of the rotor punching L2 along the circumferential direction of the motor.
[0100] In one embodiment, one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a is distributed as follows: Fig.13 On the hole wall of the through hole H1 of the rotor punching M1 shown in the figure, one of the protrusions P1 of the group of protrusions P1 of the magnetic steel hole 111b is distributed as follows: Fig.13 On the hole wall of the through hole H2 of the rotor punching M1 shown in the figure, a protrusion P1 on the hole wall of the through hole H1 of the rotor punching M1 is symmetrically distributed with a protrusion P1 on the hole wall of the through hole H2 of the rotor punching M1 along the circumference of the motor. One protrusion P2 of another group of protrusions P2 of the magnetic steel hole 111a is distributed as follows Fig.14 On the hole wall of the through hole H1 of the rotor punching M2 shown in the figure, one of the protrusions P2 in another group of protrusions P2 of the magnetic steel hole 111b is distributed as follows: Fig.14 On the hole wall of the through hole H2 of the rotor punching M2 shown, a protrusion P2 on the hole wall of the through hole H1 of the rotor punching M2 is symmetrically distributed with a protrusion P2 on the hole wall of the through hole H2 of the rotor punching M2 along the circumferential direction of the motor.
[0101] In one embodiment, one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a is distributed as follows: Fig.16 On the hole wall of the through hole H1 of the rotor punching sheet M4 shown in the figure, one of the protrusions P1 of the group of protrusions P1 of the magnetic steel hole 111b is distributed as follows: Fig.16 On the hole wall of the through hole H2 of the rotor punching M4 shown in the figure, a protrusion P1 on the hole wall of the through hole H1 of the rotor punching M4 is symmetrically distributed with a protrusion P1 on the hole wall of the through hole H2 of the rotor punching M4 along the circumference of the motor. One protrusion P2 of another group of protrusions P2 of the magnetic steel hole 111a is distributed as shown in the figure. Fig.17 On the hole wall of the through hole H1 of the rotor punching M5 shown in the figure, one of the protrusions P2 in another group of protrusions P2 of the magnetic steel hole 111b is distributed as follows: Fig.17 On the hole wall of the through hole H2 of the rotor punching M5 shown, a protrusion P2 on the hole wall of the through hole H1 of the rotor punching M5 and a protrusion P2 on the hole wall of the through hole H2 of the rotor punching M5 are symmetrically distributed along the circumferential direction of the motor.
[0102] In one embodiment, the protrusions P of the magnetic steel holes 111 a and the protrusions P of the magnetic steel holes 111 b symmetrically distributed along the circumference of the motor are distributed on two different rotor punchings.
[0103] In this way, even if the quality of each rotor punching of the rotor core is uneven, the quality of the rotor core 110 can be ensured to be relatively uniform. In addition, the rotor punching L3 and the rotor punching L4 are the same type of rotor punching. During the assembly of the rotor core 110, the rotor punching L3 is turned over and stacked with the other rotor punchings. In this way, only one type of rotor punching needs to be processed, which simplifies the processing technology of the rotor punching of the rotor core.
[0104] In one embodiment, one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a is distributed as follows: Fig.11 On the hole wall of the through hole H1 of the rotor punching L4 shown in the figure, one of the protrusions P2 in another group of protrusions P2 of the magnetic steel hole 111b is distributed as follows: Fig.11 On the hole wall of the through hole H2 of the rotor punching L4 shown in the figure, the protrusions P1 on the hole wall of the through hole H1 of the rotor punching L4 and the protrusions P2 on the hole wall of the through hole H2 of the rotor punching L5 are asymmetrically distributed along the circumference of the motor. One of the protrusions P2 in the other group of protrusions P2 of the magnetic steel hole 111a is distributed as follows Fig.12 On the hole wall of the through hole H1 of the rotor punching L5 shown in the figure, one of the protrusions P1 of the group of protrusions P1 of the magnetic steel hole 111b is distributed as follows: Fig.12 On the hole wall of the through hole H2 of the rotor punching L5 shown, the protrusions P2 on the hole wall of the through hole H1 of the rotor punching L4 along the circumference of the motor are asymmetrically distributed with the protrusions P1 on the hole wall of the through hole H2 of the rotor punching L5. The protrusions P1 on the hole wall of the through hole H1 of the rotor punching L4 along the circumference of the motor are symmetrically distributed with the protrusions P1 on the hole wall of the through hole H2 of the rotor punching L5, and the protrusions P2 on the hole wall of the through hole H2 of the rotor punching L4 along the circumference of the motor are symmetrically distributed with the protrusions P2 on the hole wall of the through hole H1 of the rotor punching L5.
[0105] In one embodiment, one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a is distributed as follows: Fig.18 On the hole wall of the through hole H1 of the rotor punching sheet M6 shown in the figure, one of the protrusions P2 in another group of protrusions P2 of the magnetic steel hole 111b is distributed as follows: Fig.18 On the hole wall of the through hole H2 of the rotor punching M6 shown in the figure, the protrusions P1 on the hole wall of the through hole H1 of the rotor punching M6 and the protrusions P2 on the hole wall of the through hole H2 of the rotor punching M7 are asymmetrically distributed along the circumference of the motor. One of the protrusions P2 in the other group of protrusions P2 of the magnetic steel hole 111a is distributed as follows Fig.19 On the hole wall of the through hole H1 of the rotor punching sheet M7 shown in the figure, one of the protrusions P1 of the group of protrusions P1 of the magnetic steel hole 111b is distributed as follows: Fig.19 On the hole wall of the through hole H2 of the rotor punching M7 shown, the protrusion P2 on the hole wall of the through hole H1 of the rotor punching M6 along the circumference of the motor is asymmetrically distributed with the protrusion P1 on the hole wall of the through hole H2 of the rotor punching M7. The protrusion P1 on the hole wall of the through hole H1 of the rotor punching M6 along the circumference of the motor is symmetrically distributed with the protrusion P1 on the hole wall of the through hole H2 of the rotor punching M7, and the protrusion P2 on the hole wall of the through hole H2 of the rotor punching M6 along the circumference of the motor is symmetrically distributed with the protrusion P2 on the hole wall of the through hole H1 of the rotor punching M7.
[0106] In one embodiment, one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a is distributed as follows: Fig. 20 On the hole wall of the through hole H1 of the rotor punching sheet M8 shown in the figure, one of the protrusions P2 in another group of protrusions P2 of the magnetic steel hole 111b is distributed as follows: Fig. 20 On the hole wall of the through hole H2 of the rotor punching M8 shown in the figure, the protrusions P1 on the hole wall of the through hole H1 of the rotor punching M8 and the protrusions P2 on the hole wall of the through hole H2 of the rotor punching M9 are asymmetrically distributed along the circumference of the motor. One of the protrusions P2 in the other group of protrusions P2 of the magnetic steel hole 111a is distributed as follows Fig.21 On the hole wall of the through hole H1 of the rotor punching sheet M9 shown in the figure, one of the protrusions P1 of the group of protrusions P1 of the magnetic steel hole 111b is distributed as follows: Fig.21 On the hole wall of the through hole H2 of the rotor punching M9 shown, the protrusion P2 on the hole wall of the through hole H1 of the rotor punching M8 along the circumference of the motor is asymmetrically distributed with the protrusion P1 on the hole wall of the through hole H2 of the rotor punching M9. The protrusion P1 on the hole wall of the through hole H1 of the rotor punching M8 along the circumference of the motor is symmetrically distributed with the protrusion P1 on the hole wall of the through hole H2 of the rotor punching M9, and the protrusion P2 on the hole wall of the through hole H2 of the rotor punching M8 along the circumference of the motor is symmetrically distributed with the protrusion P2 on the hole wall of the through hole H1 of the rotor punching M9.
[0107] In one embodiment, the number of the multiple protrusions P of the magnetic steel hole 111c is equal to the number of a group of protrusions P1 or another group of protrusions P2 of the magnetic steel hole 111a, and the multiple rotor punchings distributed with the multiple protrusions P of the magnetic steel hole 111c are the same as the multiple rotor punchings distributed with a group of protrusions P1 or another group of protrusions P2 of the magnetic steel hole 111a.
[0108] In this way, a group of protrusions P1 or another group of protrusions P2 in the magnetic steel holes 111a of the rotor core 110 and multiple protrusions P in the magnetic steel holes 111c are all processed on the same rotor punching in the rotor core 110, which can not only simplify the processing technology of the rotor punching, but also simplify the assembly process of the rotor punching into the rotor core 110.
[0109] In one embodiment, each protrusion P of the magnetic steel hole 111c is arranged with one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a. Fig.13 The same rotor lamination M1 is shown.
[0110] In one embodiment, each protrusion P of the magnetic steel hole 111c is arranged with a protrusion P2 of another group of protrusions P2 of the magnetic steel hole 111a. Fig.17 The same rotor lamination M5 is shown.
[0111] In one embodiment, each protrusion P of the magnetic steel hole 111c is arranged with one protrusion P1 of a group of protrusions P1 of the magnetic steel hole 111a. Fig.18 The same rotor lamination M6 is shown.
[0112] In one embodiment, each protrusion P of the magnetic steel hole 111c is arranged with a protrusion P2 of another group of protrusions P2 of the magnetic steel hole 111a. Fig.21 The same rotor lamination M9 is shown.
[0113] In some embodiments, such as Figure 6 As shown, the multiple protrusions P of the magnetic steel hole 111c are aligned along the axial direction of the motor. In this way, the positions where the multiple protrusions in the magnetic steel hole 111c along the axial direction of the motor abut against the magnetic steel 120 are almost located in a straight line, and the contact force of the multiple protrusions P in the magnetic steel hole 111c along the axial direction of the motor on the magnetic steel 120 is relatively uniform, which can prevent the magnetic steel 120 in the magnetic steel hole 111c from rotating in a direction perpendicular to the axial direction of the motor.
[0114] The structure of the multiple protrusions P of the magnetic steel hole 111d is similar to the structure of the multiple protrusions P of the magnetic steel hole 111c. For the structure of the multiple protrusions P of the magnetic steel hole 111d, please refer to the relevant description of the structure of the multiple protrusions P of the magnetic steel hole 111c above, which will not be repeated here.
[0115] In some embodiments, such as Figure 3As shown, at least one magnetic steel hole 111 also includes at least one groove G, and multiple grooves G in the same magnetic steel hole 111 are distributed on the same side hole wall T1, and each groove G in the same magnetic steel hole 111 is recessed from the hole wall T1 of the magnetic steel hole 111 to the side away from the hole wall T1 of the magnetic steel hole 111, and each groove G includes a notch and a groove bottom arranged relatively along the first direction, and each groove G passes through each rotor core 110 along the axial direction of the motor.
[0116] In addition, one end of each protrusion P in the same magnetic steel hole 111 is used to be fixedly connected to the bottom of a groove G, and the other end is used to abut against one or more magnetic steels 120. The size of each protrusion P in the same magnetic steel hole 111 along the first direction is larger than the size of each groove G, and the size of each protrusion P in the same magnetic steel hole 111 along the second direction is smaller than the size of each groove G.
[0117] In this way, the groove G in the magnetic steel hole 111 can provide a space for the protrusion P. On the one hand, the protrusion P occupies less space in the magnetic steel hole 111, thereby preventing the protrusion P from affecting the performance of the rotor 100. On the other hand, the size of the protrusion P in the magnetic steel hole 111 along the first direction can be set larger, which is conducive to increasing the elastic force of the protrusion P and increasing the abutment force of the protrusion P on the magnetic steel 120. Furthermore, during the operation of the motor, the firmness of one or more magnetic steels 120 in the magnetic steel hole 111 is higher, which improves the performance of the motor and reduces the maintenance cost of the motor.
[0118] It should be noted that the number of grooves G in the same magnetic steel hole 111 depends on the number of groups of multiple protrusions P in the same magnetic steel hole 111. In the embodiment where the multiple protrusions P in the same magnetic steel hole 111 are divided into two groups of protrusions P1-P2, the multiple grooves G in the same magnetic steel hole 111 are also divided into two grooves arranged at intervals along the second direction, and each groove is used to accommodate a group of protrusions. For example, Figure 3 and Figure 6 As shown, the magnetic steel hole 111a includes two grooves G1 and G2, one groove G1 is used to accommodate a group of protrusions P1, and the other groove G2 is used to accommodate another group of protrusions P2. In the embodiment where the multiple protrusions P in the same magnetic steel hole are only one group, the same magnetic steel hole 111 includes only one groove. For example, Figure 3 and Figure 7 As shown, the magnetic steel hole 111 c includes a groove G, and the groove G is used to accommodate a plurality of protrusions P.
[0119] In some embodiments, such as Figures 3 to 21As shown, in addition to the multiple protrusions P described above, at least one magnetic steel hole 111 also includes two locking protrusions P3-P4. The multiple protrusions P and the two locking protrusions P3-P4 in the same magnetic steel hole 111 are distributed on the same side hole wall T1. The two locking protrusions P3-P4 in the same magnetic steel hole 111 along the second direction are respectively used to contact the surfaces of different sides of one or more magnetic steels 120 in the same magnetic steel hole 111, and are used to lock the one or more magnetic steels 120 in the same magnetic steel hole 111 between the two locking protrusions P3-P4 along the second direction. The multiple protrusions P are arranged between the two locking protrusions P3-P4 along the second direction, and the interval between the two locking protrusions P3-P4 along the second direction is greater than or equal to the size of one or more magnetic steels 120. In this way, during the rotation of the motor, the magnetic steel 120 can be prevented from moving along the second direction.
[0120] It should be noted that the axial direction of the rotor core 110 involved in the embodiment of the present application can be understood as the axial direction of the rotor punching, the axial direction of the motor, the axial direction of the motor shaft of the motor, and the axial direction of the stator. The radial direction of the rotor core 110 can be understood as the radial direction of the rotor punching, the radial direction of the motor, and the radial direction of the rotor. The circumferential direction of the rotor core 110 can be understood as the circumferential direction of the rotor punching, the circumferential direction of the motor, and the circumferential direction of the stator. Among them, the circumferential direction can be understood as the circumferential direction.
[0121] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A motor, characterized in that: The rotor of the motor comprises a plurality of rotor cores, each of which comprises a plurality of rotor punchings, and the plurality of rotor punchings in each of the rotor cores are arranged adjacent to each other in sequence along the axial direction of the motor, and each of the rotor cores comprises a motor shaft hole and a plurality of magnetic steel holes, and the plurality of magnetic steel holes in each of the rotor cores are arranged around the motor shaft hole, and each of the magnetic steel holes comprises two side hole walls, and one or more magnetic steels contained in each of the magnetic steel holes are arranged between the two side hole walls, and one side surface of the one or more magnetic steels faces the one side hole wall, and the other side surface of the one or more magnetic steels faces the other side hole wall, wherein: At least one of the magnetic steel holes also includes a plurality of protrusions, and the plurality of protrusions in the same magnetic steel hole are distributed on the same side of the hole wall and are used to contact the same side surface of one or more magnetic steels, and the plurality of protrusions in the same magnetic steel hole are distributed on a plurality of the rotor punchings arranged at intervals along the axial direction of the motor.
2. The motor according to claim 1, characterized in that The multiple protrusions in one of the magnetic steel holes are divided into two groups of protrusions, the two groups of protrusions are arranged at intervals, and the arrangement directions of the two groups of protrusions, the arrangement directions of the hole walls on both sides, and the motor axis are perpendicular to each other.
3. The motor according to claim 2, characterized in that A rotor punch without protrusions is arranged between each rotor punch on which the protrusions of one of the two groups of protrusions are distributed and one rotor punch on which the protrusions of the other group of protrusions are distributed.
4. The motor according to claim 2 or 3, characterized in that: Each group of protrusions is aligned along the axial direction of the motor.
5. The electric machine according to any one of claims 2 to 4, characterized in that The two groups of protrusions have an equal number; The interval between the two groups of protrusions along the arrangement direction of the two groups of protrusions is smaller than the size of one or more magnetic steels accommodated in the one magnetic steel hole.
6. The electric machine according to any one of claims 2 to 5, characterized in that The other magnetic steel hole is arranged on a side of the one magnetic steel hole away from the one motor shaft hole, wherein: The number of the plurality of protrusions of the other magnetic steel hole is equal to the number of the group of protrusions of the one magnetic steel hole; The multiple rotor punching sheets having multiple protrusions distributed in the other magnetic steel hole are the same as the multiple rotor punching sheets having a group of protrusions distributed in the one magnetic steel hole.
7. The electric machine according to any one of claims 2 to 6, characterized in that The multiple protrusions of another magnetic steel hole are aligned along the axial direction of the motor.
8. The electric machine according to any one of claims 1 to 7, characterized in that The two magnetic steel holes are symmetrically distributed along the circumference of the motor, wherein: The multiple protrusions of one of the two magnetic steel holes and the multiple protrusions of the other magnetic steel hole are distributed on the multiple rotor punchings arranged at intervals along the axial direction of the motor.
9. The motor according to claim 8, characterized in that Each protrusion of the one magnetic steel hole is symmetrically distributed with respect to one protrusion of the other magnetic steel hole along the circumferential direction of the motor.
10. The motor according to claim 9, characterized in that One of the protrusions of one of the two magnetic steel holes and one of the protrusions of the other magnetic steel hole are symmetrically distributed along the circumference of the motor, and one of the protrusions of one of the magnetic steel holes and one of the protrusions of the other magnetic steel hole are distributed on the same rotor punching among the multiple rotor punchings arranged at intervals along the axial direction of the motor.
11. The motor according to claim 9, characterized in that One protrusion of one of the two magnetic steel holes and one protrusion of the other magnetic steel hole are symmetrically distributed along the circumference of the motor, and one protrusion of one magnetic steel hole and one protrusion of the other magnetic steel hole are distributed on two different rotor punchings among the multiple rotor punchings arranged at intervals along the axial direction of the motor.
12. The electric machine according to any one of claims 1 to 11, characterized in that The multiple protrusions in the same magnetic steel hole are distributed on one of the hole walls on both sides, wherein: Along the arrangement direction of the hole walls on both sides, the interval between each of the plurality of protrusions in the same magnetic steel hole and the hole wall on the other side of the hole walls on both sides is smaller than the size of each magnetic steel.
13. The electric machine according to any one of claims 1 to 12, characterized in that The size of each protrusion along the arrangement direction of the hole walls on both sides is equal; The size of each protrusion along the arrangement direction of the hole walls on both sides is smaller than the size of each magnetic steel.
14. A powertrain, characterized in that: The power assembly comprises a reducer and a motor as claimed in any one of claims 1 to 13, wherein a motor shaft of the motor is used for transmission connection with an input shaft of the reducer.
15. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a transmission mechanism and the powertrain as claimed in claim 14, wherein the powertrain is used to drive the wheels through the transmission mechanism.