CN219999131U - Rotor assembly, motor, vehicle and electrical equipment - Google Patents

Abstract

The utility model provides a rotor assembly, a motor, a vehicle and electrical equipment. The rotor assembly comprises a rotor core and a plurality of magnetic pieces; the rotor core comprises a plurality of rotor punching sheets which are stacked along the axial direction of the rotor assembly; the plurality of magnetic pieces are arranged on the rotor core and are arranged along the circumferential direction of the rotor core; the rotor core comprises a rotor core, a plurality of magnetic pieces, a plurality of mounting surfaces, a plurality of first grooves, a plurality of second grooves, a plurality of magnetic pieces, a plurality of first grooves and a plurality of second grooves, wherein the plurality of mounting surfaces are arranged on the circumferential side wall of the rotor core, the plurality of magnetic pieces are respectively attached to the plurality of mounting surfaces, the first grooves are formed in at least part of rotor punching sheets in a concave mode towards the inside of the rotor core, the first grooves are formed in at least part of the mounting surfaces, and the magnetic pieces cover the notch of the first grooves.

Description

Rotor assembly, motor, vehicle and electrical equipment

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor assembly, a motor, a vehicle and electrical equipment.

Background

At present, vehicles become a main vehicle for people to travel in daily life.

In the related art, a vehicle is provided with a steering system, and an electric power assisting structure is arranged in the steering system for improving the convenience of the steering system in use, and the power source of the electric power assisting structure is a motor, but certain noise and vibration can be generated in the process of outputting power by the motor, so that the influence on the driver and passengers in the vehicle is generated.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the utility model proposes a rotor assembly.

A second aspect of the utility model proposes an electric machine.

A third aspect of the utility model proposes a vehicle.

A fourth aspect of the present utility model proposes an electrical device.

In view of this, a first aspect of the present utility model provides a rotor assembly comprising a rotor core and a plurality of magnetic members; the rotor core comprises a plurality of rotor punching sheets which are stacked along the axial direction of the rotor assembly; the plurality of magnetic pieces are arranged on the rotor core and are arranged along the circumferential direction of the rotor core; the rotor core comprises a rotor core, a plurality of magnetic pieces, a plurality of mounting surfaces, a plurality of first grooves, a plurality of second grooves, a plurality of magnetic pieces, a plurality of first grooves and a plurality of second grooves, wherein the plurality of mounting surfaces are arranged on the circumferential side wall of the rotor core, the plurality of magnetic pieces are respectively attached to the plurality of mounting surfaces, the first grooves are formed in at least part of rotor punching sheets in a concave mode towards the inside of the rotor core, the first grooves are formed in at least part of the mounting surfaces, and the magnetic pieces cover the notch of the first grooves.

The rotor assembly comprises a rotor iron core and a plurality of magnetic pieces, wherein the magnetic pieces are arranged along the circumferential direction of the rotor iron core, and when the rotor assembly is matched with a stator assembly, a magnetic field generated after a stator winding of the stator assembly is electrified can drive the magnetic pieces to drive the rotor iron core to rotate, so that the output of power is realized.

The rotor core is provided with at least one installation face opposite to a plurality of magnetic pieces, the magnetic pieces can be installed on the installation face, and at least one installation face is provided with a first groove which is sunken towards the inside of the rotor core, and the first groove can improve the cogging torque of the motor, so that the cogging torque is reduced when the motor works, and the influence of the cogging torque on the vibration of the motor is reduced. The first groove is used for reducing the cogging torque of the motor, so that the vibration of the motor can be reduced, the noise of the motor during working can be reduced, and the quality of the motor is improved. The motor is applied to the vehicle, and can reduce the noise and vibration of the motor, so that the influence of the noise and vibration generated by the motor on the driver and the passenger in the vehicle is reduced, and the riding feeling of the driver and the passenger in the vehicle is improved.

The first groove is arranged on the mounting surface of the rotor core to improve the cogging torque of the motor, and the cogging torque can be formed by stamping along with the rotor punching sheet according to the position of the first groove when the rotor core is processed, so that the manufacturing difficulty of the rotor core cannot be increased due to the arrangement of the first groove. And the first groove is arranged on the mounting surface of the rotor core to improve the cogging torque of the motor, and the shape of the magnetic part does not need to be changed according to the position and the shape of the first groove, so that the manufacturing difficulty of the rotor assembly is further reduced, the manufacturing process of the rotor assembly is simplified, and the manufacturing efficiency of the rotor assembly is improved.

The rotor core includes a plurality of rotor punching that follow the axial range upon range of setting of rotor subassembly, and rotor core's circumference lateral wall is provided with the installation face, and a plurality of rotor punching stacks the back promptly, and a plurality of rotor punching are located the edge in same region in the circumference can form the installation face, and first recess sets up promptly on the installation face, also sets up on the rotor punching. The first grooves may be provided on part of the rotor sheet, or may be provided on all of the rotor sheets. The first grooves may be provided on part of the mounting surface, or may be provided on all of the mounting surface.

The plurality of magnetic pieces cover the notch of the first groove, so that the first groove cannot be exposed on the surface of the rotor assembly in the range of the magnetic pieces, the influence of the first groove on the air gap of the motor is reduced, and the stability of the motor in the working process is improved.

The number of the installation surfaces is multiple, the multiple installation surfaces are arranged along the circumferential side wall of the rotor core, the multiple magnetic pieces are respectively attached to the multiple installation surfaces, and therefore the installation and the positioning of the multiple magnetic pieces are achieved, and the stability of the magnetic pieces is improved.

Specifically, the number of the mounting surfaces can be the same as the number of the magnetic pieces, namely, each mounting surface is attached with one magnetic piece; the number of the mounting surfaces can be different from that of the magnetic pieces, and one mounting surface can be bonded with two magnetic pieces or one magnetic piece.

The mounting surface may be one, for example, the entire outer peripheral side wall of the rotor core may be one mounting surface, and all the magnetic members may be attached to the one mounting surface.

The plurality of mounting surfaces can be different planes on the circumferential side wall of the rotor core, or can be different parts of one surface on the circumferential side wall of the rotor core, for example, the circumferential side wall of the rotor core is a complete cylindrical surface, and the plurality of mounting surfaces are different areas of the cylindrical surface respectively.

In particular, the rotor assembly can be used for an electric motor, which can be used for a vehicle, when the electric motor is used for the vehicle, can be used as a power assist device for the vehicle, for example a power assist device for a steering system; but also for driving the vehicle, such as an electric motor driving the vehicle in motion.

Here, the axial direction described in the present utility model is the axial direction of the rotor core, the circumferential direction described in the present utility model is the circumferential direction of the rotor core, the radial direction described in the present utility model is the radial direction of the rotor core, and the tangential direction described in the present utility model is the tangential direction of the rotor core.

In addition, the rotor assembly in the technical scheme provided by the utility model can also have the following additional technical characteristics:

in one aspect of the present utility model, the first groove is opposite to a center line of the magnetic member in an axial direction of the rotor core.

In this technical scheme, first recess is relative with the axial centreline of magnetic part at rotor core for first recess distributes in the middle part position of magnetic part, promotes the effect that first recess improved the cogging torque of motor, further reduces vibration and the noise of motor.

Specifically, the number of the first grooves on each mounting surface may be one, and the number of the first grooves on each mounting surface may be plural.

In the case where the number of the first grooves on each mounting surface is one, the first grooves are opposed to the center line of the magnetic member attached to the mounting surface in the axial direction.

Under the condition that the number of the first grooves on each mounting surface is a plurality of, the plurality of first grooves can be opposite to the central line of the magnetic piece attached to the mounting surface in the axial direction, and the plurality of grooves can be arranged along the axial direction of the motor or staggered along the axial direction of the motor. One of the plurality of first grooves may be opposite to a center line of the magnetic member attached to the mounting surface in the axial direction. Some of the first grooves may be located opposite to a center line of the magnetic member attached to the mounting surface in an axial direction.

Further, the first groove is symmetrical with respect to a center line of the magnetic member in an axial direction of the rotor core.

Here, the center line of the magnetic member in the axial direction of the rotor core means that the center line of the magnetic member extends in the axial direction of the rotor core.

In one aspect of the present utility model, the number of the first grooves is plural, and the plural first grooves are symmetrical with respect to a center line of the magnetic member in an axial direction of the rotor core.

In this technical scheme, the quantity of first recess is a plurality of, and a plurality of first recesses are symmetrical for the axial ascending central line of magnetic part at rotor core for first recess distributes in the magnetic part in the both sides of rotor core's circumference, and then promotes the effect that first recess improved the cogging torque of motor, further reduces vibration and the noise of motor.

Specifically, in the case where the number of the first grooves is plural, the number of the first grooves may be an even number, the even number of the first grooves are respectively distributed on both sides of the center line of the magnetic member in the axial direction of the rotor core, and the even number of the first grooves are symmetrical with respect to the center line of the magnetic member in the axial direction of the rotor core.

In the case where the number of the first grooves is an even number, all the first grooves may be divided into two groups, and the two groups of the first grooves are symmetrical with respect to the center line of the magnetic member in the axial direction of the rotor core as a whole. All the first grooves can be divided into two groups, one or more first grooves can be arranged in each of the two groups of first grooves, and the two groups of first grooves are symmetrical relative to the central line of the magnetic piece in the axial direction of the rotor core as a whole; the rest of the first grooves may be opposite to the center line of the magnetic member in the axial direction of the rotor core, or may be distributed at rest positions on the mounting surface.

The number of the first grooves can be an odd number, part of the grooves in the odd number are divided into two groups, one or more first grooves can be arranged in each of the two groups of first grooves, and the two groups of first grooves are symmetrical relative to the central line of the magnetic piece in the axial direction of the rotor core as a whole; the rest of the first grooves may be opposite to the center line of the magnetic member in the axial direction of the rotor core, or may be distributed at rest positions on the mounting surface.

In one aspect of the present utility model, the first groove is rectangular, semicircular, trapezoidal or triangular in shape.

In the technical scheme, the first groove is rectangular, semicircular, trapezoidal or triangular, so that the effect of improving the cogging torque of the motor by the first groove is improved, the cogging torque of the motor is further reduced, the stamping difficulty of the first groove is reduced, and the manufacturing process of the rotor core is further simplified.

Specifically, the shape of the first groove may be a shape of one cross section of the first groove, which is perpendicular to the axial direction of the rotor core.

In one embodiment of the present utility model, the area of the first groove is greater than or equal to 0.5 square millimeters and less than or equal to 1.5 square millimeters.

In the technical scheme, the first groove can be used for effectively improving the cogging torque of the motor by adjusting the area of the first groove. The area of the first groove is 0.5 square millimeter to 1.5 square millimeters, so that the cogging torque of the motor is effectively reduced, and the vibration and noise of the motor are further reduced.

Specifically, the area of the cross section of the first groove in the radial direction of the rotor core may be 0.5 square millimeters.

The area of the cross section of the first groove in the radial direction of the rotor core may also be 0.7 square millimeters, 0.9 square millimeters, 1 square millimeter, or 1.2 square millimeters.

The area of the cross section of the first groove in the radial direction of the rotor core may also be 1.5 square millimeters.

Specifically, the area of the first groove may be an area of one section of the first groove, which section is perpendicular to the axial direction of the rotor core.

In one aspect of the present utility model, the first groove penetrates the rotor core in an axial direction of the rotor core.

In the technical scheme, the first groove penetrates through the rotor core along the axial direction of the rotor core, so that the consistency of each rotor punching sheet of the rotor core can be ensured, and the manufacturing difficulty of the rotor core is further reduced.

In one technical scheme of the utility model, the rotor core is provided with a second groove, the second groove is positioned between two adjacent magnetic pieces in the plurality of magnetic pieces, and the second groove is used for filling plastic packaging materials to plastic package the rotor assembly.

In this technical scheme, rotor core is provided with the second recess, and the second recess is located between two adjacent magnetism spare in a plurality of magnetism spare, and the second recess can be regarded as the groove of moulding plastics, and then realizes the connection and the fixed of each rotor punching of rotor core, promotes rotor core stability in the motor course of the work.

A second aspect of the present utility model provides an electrical machine comprising a rotor assembly as claimed in any one of the preceding claims, whereby the electrical machine has all the advantages of a rotor assembly as claimed in any one of the preceding claims.

In particular, the motor may be a motor of an electric power steering system, such as a brushless motor for an electric power steering system.

A third aspect of the present utility model provides a vehicle comprising a rotor assembly as defined in any one of the above claims, or an electric machine as defined in any one of the above claims, whereby the vehicle has all the advantages of a rotor assembly as defined in any one of the above claims, or an electric machine as defined in any one of the above claims.

Specifically, the vehicle may be an electric vehicle, and the motor may be a motor of an electric power steering system or a motor that drives the electric vehicle.

The vehicle may also be an automobile in which the internal combustion engine serves as an engine, and the motor may be a motor of an electric power steering system.

A fourth aspect of the present utility model provides an electrical apparatus comprising a rotor assembly as defined in any one of the above claims, or a motor as defined in any one of the above claims, whereby the electrical apparatus has all the advantages of a rotor assembly as defined in any one of the above claims, or a motor as defined in any one of the above claims.

Specifically, the electrical equipment can be an air conditioner, a refrigerator, a freezer or a showcase, and the motor can be used as a power structure of a compressor of the electrical equipment.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 illustrates one of the structural schematic diagrams of a rotor assembly according to one embodiment of the present utility model;

fig. 2 shows a schematic structural view of a rotor core according to an embodiment of the present utility model;

FIG. 3 shows a schematic diagram of the cogging torque as a function of time for an electric machine according to one embodiment of the utility model;

fig. 4 shows a second schematic structural view of a rotor assembly according to an embodiment of the present utility model.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 4 is:

100 rotor core, 110 mounting surface, 120 first recess, 130 second recess, 140 rotor punching, 200 magnetic part.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

A rotor assembly, a motor, a vehicle, and an electrical device according to some embodiments of the present utility model are described below with reference to fig. 1 to 4.

In one embodiment of the present utility model, as shown in fig. 1 and 2, there is provided a rotor assembly including a rotor core 100 and a plurality of magnetic members 200; the rotor core 100 includes a plurality of rotor laminations arranged in a stacked manner along an axial direction of the rotor assembly; a plurality of magnetic members 200 disposed on the rotor core 100, arranged along a circumferential direction of the rotor core 100; wherein, the circumferential side wall of the rotor core 100 is provided with a plurality of mounting surfaces 110, a plurality of magnetic pieces 200 are respectively attached to the plurality of mounting surfaces 110, at least part of the rotor punching sheet is provided with a first groove 120 recessed toward the inside of the rotor core 100, at least part of the mounting surfaces 110 is provided with the first groove 120, and the magnetic pieces 200 cover the notch of the first groove 120.

In this embodiment, the rotor assembly includes a rotor core 100 and a plurality of magnetic members 200, the plurality of magnetic members 200 are arranged along the circumference of the rotor core 100, and when the rotor assembly is matched with the stator assembly, a magnetic field generated after the stator winding of the stator assembly is electrified can drive the plurality of magnetic members 200 to drive the rotor core 100 to rotate, so as to realize the output of power.

The rotor core 100 is provided with at least one mounting surface 110 opposite to the plurality of magnetic members 200, the magnetic members 200 can be mounted on the mounting surface 110, and the at least one mounting surface 110 is provided with a first groove 120 recessed toward the inside of the rotor core 100, and the first groove 120 can improve the cogging torque of the motor, so that the cogging torque is reduced when the motor works, and the influence of the cogging torque on the vibration of the motor is reduced. Since the reduction of the cogging torque of the motor through the first grooves 120 can reduce the vibration of the motor, the noise of the motor when operating can be reduced, and the quality of the motor can be improved. The motor is applied to the vehicle, and can reduce the noise and vibration of the motor, so that the influence of the noise and vibration generated by the motor on the driver and the passenger in the vehicle is reduced, and the riding feeling of the driver and the passenger in the vehicle is improved.

The first groove 120 is formed on the mounting surface 110 of the rotor core 100 to improve the cogging torque of the motor, and the rotor core 100 can be formed by one-step stamping with the rotor punching sheet according to the position of the first groove 120 when the rotor core 100 is processed, so that the manufacturing difficulty of the rotor core 100 is not increased due to the first groove 120. And the first groove 120 is arranged on the mounting surface 110 of the rotor core 100 to improve the cogging torque of the motor, the shape of the magnetic element 200 does not need to be changed according to the position and the shape of the first groove 120, the manufacturing difficulty of the rotor assembly is further reduced, the manufacturing process of the rotor assembly is simplified, and the manufacturing efficiency of the rotor assembly is improved.

The rotor core 100 includes a plurality of rotor sheets 140 stacked in an axial direction of the rotor assembly, and a mounting surface 110 is provided on a circumferential side wall of the rotor core 100, that is, after the plurality of rotor sheets 140 are stacked, edges of the plurality of rotor sheets 140 located in the same area in the circumferential direction can form the mounting surface 110, and the first groove 120 is provided on both the mounting surface 110 and the rotor sheets 140. The first grooves 120 may be provided on a part of the rotor sheet 140, or the first grooves 120 may be provided on all of the rotor sheet 140. The first grooves 120 may be provided on a part of the mounting surface 110, or the first grooves 120 may be provided on all of the mounting surface 110.

As shown in fig. 1 and fig. 4, the plurality of magnetic elements 200 cover the notch of the first groove 120, so that the first groove 120 is not exposed on the surface of the rotor assembly within the range of the magnetic elements 200, thereby reducing the influence of the first groove 120 on the air gap of the motor and improving the stability of the motor in the working process.

As shown in fig. 2, the number of the mounting surfaces 110 is plural, the plural mounting surfaces 110 are disposed along the circumferential side wall of the rotor core 100, and the plural magnetic members 200 are respectively attached to the plural mounting surfaces 110, so as to mount and position the plural magnetic members 200, and improve the stability of the magnetic members 200.

Specifically, the number of the mounting surfaces 110 may be the same as the number of the magnetic elements 200, that is, one magnetic element 200 is attached to each mounting surface 110; the number of the mounting surfaces 110 may be different from the number of the magnetic members 200, and two magnetic members 200 may be attached to one mounting surface 110, or one magnetic member 200 may be attached to two mounting surfaces 110.

The mounting surface 110 may be one, for example, the entire outer peripheral side wall of the rotor core 100 may be one mounting surface 110, and all the magnetic members 200 may be attached to the one mounting surface 110.

The plurality of mounting surfaces 110 may be different planes on the circumferential side wall of the rotor core 100, or may be different portions of one surface on the circumferential side wall of the rotor core 100, for example, the circumferential side wall of the rotor core 100 is a complete cylindrical surface, and the plurality of mounting surfaces 110 are different regions of the cylindrical surface.

In particular, the rotor assembly can be used for an electric motor, which can be used for a vehicle, when the electric motor is used for the vehicle, can be used as a power assist device for the vehicle, for example a power assist device for a steering system; but also for driving the vehicle, such as an electric motor driving the vehicle in motion.

Here, the axial direction described in the present utility model is the axial direction of the rotor core 100, the circumferential direction described in the present utility model is the circumferential direction of the rotor core 100, the radial direction described in the present utility model is the radial direction of the rotor core 100, and the tangential direction described in the present utility model is the tangential direction of the rotor core 100.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the first groove 120 is opposite to a center line of the magnetic member 200 in the axial direction of the rotor core 100.

In this embodiment, the first grooves 120 are opposite to the center line of the magnetic member 200 in the axial direction of the rotor core 100 such that the first grooves 120 are distributed at the middle position of the magnetic member 200. As shown in fig. 3, the horizontal axis is time in s (seconds), the vertical axis is cogging torque in mNm (milli-newton-meter), the curve L1 is a trend of change in cogging torque of a motor in which the first groove 120 is not provided, and L3 is a trend of change in cogging torque of a motor in which the first groove 120 is provided opposite to the center line of the magnetic member 200 in the axial direction of the rotor core 100, and when the motor is operated, the cogging torque of a motor in which the first groove 120 is provided opposite to the center line of the magnetic member 200 in the axial direction of the rotor core 100 is smaller than the cogging torque of a motor in which the first groove 120 is not provided, thereby enabling the first groove 120 to improve cogging torque of the motor and further reduce vibration and noise of the motor.

Specifically, the number of the first grooves 120 on each mounting surface 110 may be one, and the number of the first grooves 120 on each mounting surface 110 may be plural.

In the case where the number of the first grooves 120 on each mounting surface 110 is one, the first grooves 120 are opposed to the center line of the magnetic member 200 attached to the mounting surface 110 in the axial direction.

In the case that the number of the first grooves 120 on each mounting surface 110 is plural, the plural first grooves 120 may be opposite to the center line of the magnetic member 200 attached to the mounting surface 110 in the axial direction, and the plural grooves may be aligned in the axial direction of the motor or staggered in the axial direction of the motor. One of the plurality of first grooves 120 may be opposite to the center line of the magnetic member 200 attached to the mounting surface 110 in the axial direction. Some of the plurality of first grooves 120 may be located opposite to a center line of the magnetic member 200 attached to the mounting surface 110 in the axial direction.

Further, the first groove 120 is symmetrical with respect to a center line of the magnetic member 200 in the axial direction of the rotor core 100.

Here, the center line of the magnetic member 200 in the axial direction of the rotor core 100 means that the center line of the magnetic member 200 extends in the axial direction of the rotor core 100.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 4, the number of the first grooves 120 is plural, and the plural first grooves 120 are symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100.

In this embodiment, the number of the first grooves 120 is plural, and the plural first grooves 120 are symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100, so that the first grooves 120 are distributed on both sides of the magnetic member 200 in the circumferential direction of the rotor core 100. As shown in fig. 3, the horizontal axis is time in s (seconds), the vertical axis is cogging torque in mNm (milli-newton-meter), the curve L1 is a trend of change in cogging torque of a motor in which the first groove 120 is not provided, and L2 is a trend of change in cogging torque of a motor in which the first groove 120 symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100 is provided, and in operation of the motor, the cogging torque of a motor in which the first groove 120 symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100 is provided is smaller than the cogging torque of a motor in which the first groove 120 is not provided, thereby enabling the first groove 120 to improve cogging torque of the motor, and further reducing vibration and noise of the motor.

Specifically, in the case where the number of the first grooves 120 is plural, the number of the first grooves 120 may be an even number, the even number of the first grooves 120 are respectively distributed on both sides of the center line of the magnetic member 200 in the axial direction of the rotor core 100, and the even number of the first grooves 120 are symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100.

In the case where the number of the first grooves 120 is an even number, all the first grooves 120 may be divided into two groups, and the two groups of the first grooves 120 are symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100 as a whole. All the first grooves 120 may be divided into two groups of the first grooves 120, and one or more first grooves 120 may be provided in each of the two groups of the first grooves 120, and the two groups of the first grooves 120 may be symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100 as a whole; the remaining first grooves 120 may be opposite to the center line of the magnetic member 200 in the axial direction of the rotor core 100, or may be distributed at the remaining positions on the mounting surface 110.

The number of the first grooves 120 may be an odd number, and part of the grooves in the odd number may be divided into two groups, and one or more first grooves 120 may be provided in each of the two groups of the first grooves 120, and the two groups of the first grooves 120 may be symmetrical with respect to the center line of the magnetic member 200 in the axial direction of the rotor core 100 as a whole; the remaining first grooves 120 may be opposite to the center line of the magnetic member 200 in the axial direction of the rotor core 100, or may be distributed at the remaining positions on the mounting surface 110.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 2, the first groove 120 has a rectangular, semicircular, trapezoidal, or triangular shape.

In this embodiment, the shape of the first groove 120 is rectangular, semicircular, trapezoidal or triangular, so that the effect of improving the cogging torque of the motor by the first groove 120 is improved, the cogging torque of the motor is further reduced, and meanwhile, the stamping difficulty of the first groove 120 is reduced, so that the manufacturing process of the rotor core 100 is simplified.

Specifically, the shape of the first groove 120 may be the shape of one section of the first groove 120, which is perpendicular to the axial direction of the rotor core 100.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

The area of the first groove 120 is 0.5 square millimeters or more and 1.5 square millimeters or less.

In this embodiment, the first grooves 120 can more effectively improve the cogging torque of the motor by adjusting the area of the first grooves 120. The area of the first groove 120 is 0.5 square millimeters to 1.5 square millimeters, effectively reducing cogging torque of the motor, and further reducing vibration and noise of the motor.

Specifically, the area of the cross section of the first groove 120 in the radial direction of the rotor core 100 may be 0.5 square millimeters.

The area of the cross section of the first groove 120 in the radial direction of the rotor core 100 may also be 0.7 square millimeters, 0.9 square millimeters, 1 square millimeter, or 1.2 square millimeters.

The area of the cross section of the first groove 120 in the radial direction of the rotor core 100 may also be 1.5 square millimeters.

Specifically, the area of the first groove 120 may be an area of one section of the first groove 120, which is perpendicular to the axial direction of the rotor core 100.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 4, the plurality of magnetic members 200 are located outside the first recess 120.

In this embodiment, the plurality of magnetic members 200 are located outside the first recess 120, and the shape of the magnetic members 200 does not need to be changed according to the position and shape of the first recess 120, so that the manufacturing difficulty of the rotor assembly is further reduced, the manufacturing process of the rotor assembly is simplified, and the manufacturing efficiency of the rotor assembly is improved.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 4, the first groove 120 penetrates the rotor core 100 in the axial direction of the rotor core 100.

In this embodiment, the first groove 120 penetrates the rotor core 100 along the axial direction of the rotor core 100, so that consistency of each rotor punching sheet of the rotor core 100 can be ensured, and manufacturing difficulty of the rotor core 100 can be further reduced.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 4, the rotor core 100 is provided with a second groove 130, and the second groove 130 is located between two adjacent magnetic members 200 among the plurality of magnetic members 200.

In this embodiment, the rotor core 100 is provided with the second groove 130, the second groove 130 is located between two adjacent magnetic pieces 200 in the plurality of magnetic pieces 200, and the second groove 130 can be used as an injection molding groove, so as to connect and fix each rotor punching of the rotor core 100, and improve the stability of the rotor core 100 in the motor working process.

In one embodiment of the utility model, an electric machine is provided comprising a rotor assembly according to any of the embodiments described above, whereby the electric machine has all the advantages of the rotor assembly according to any of the embodiments described above.

In particular, the motor may be a motor of an electric power steering system, such as a brushless motor for an electric power steering system.

In one embodiment of the utility model, a vehicle is provided comprising a rotor assembly as in any of the embodiments described above, or an electric machine as in any of the embodiments described above, whereby the vehicle is provided with all the advantages of a rotor assembly as in any of the embodiments described above, or an electric machine as in any of the embodiments described above.

Specifically, the vehicle may be an electric vehicle, and the motor may be a motor of an electric power steering system or a motor that drives the electric vehicle.

The vehicle may also be an automobile in which the internal combustion engine serves as an engine, and the motor may be a motor of an electric power steering system.

In one embodiment of the utility model, an electrical device is provided comprising a rotor assembly as in any of the embodiments described above, or a motor as in any of the embodiments described above, whereby the electrical device provides all of the benefits of a rotor assembly as in any of the embodiments described above, or a motor as in any of the embodiments described above.

Specifically, the electrical equipment can be an air conditioner, a refrigerator, a freezer or a showcase, and the motor can be used as a power structure of a compressor of the electrical equipment.

In the claims, specification and drawings of the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present utility model and making the description process easier, and not for the purpose of indicating or implying that the device or element in question must have the particular orientation described, be constructed and operated in the particular orientation, and therefore such description should not be construed as limiting the present utility model; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present utility model can be understood in detail from the above data by those of ordinary skill in the art.

In the claims, specification, and drawings of the present utility model, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In the claims, specification and drawings of the present utility model, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A rotor assembly, comprising:

a rotor core including a plurality of rotor laminations stacked in an axial direction of the rotor assembly;

a plurality of magnetic pieces provided on the rotor core, the plurality of magnetic pieces being arranged along a circumferential direction of the rotor core;

the rotor core comprises a rotor core, wherein a plurality of mounting surfaces are arranged on the circumferential side wall of the rotor core, a plurality of magnetic pieces are respectively attached to the plurality of mounting surfaces, a first groove which is sunken towards the inside of the rotor core is formed in at least part of the rotor punching sheet, the first groove is formed in at least part of the mounting surfaces, and the magnetic pieces cover the notch of the first groove.

2. The rotor assembly of claim 1 wherein the first recess is opposite a centerline of the magnetic member in an axial direction of the rotor core.

3. The rotor assembly of claim 1 wherein the number of first grooves is plural, the plural first grooves being symmetrical with respect to a center line of the magnetic member in an axial direction of the rotor core.

4. The rotor assembly of claim 1 wherein the first recess is rectangular, semi-circular, trapezoidal, or triangular in shape.

5. The rotor assembly of claim 1 wherein the first recess has an area of 0.5 square millimeters or more and 1.5 square millimeters or less.

6. The rotor assembly of any one of claims 1 to 5 wherein the first groove extends through the rotor core in an axial direction of the rotor core.

7. The rotor assembly of any one of claims 1 to 5, wherein the rotor core is provided with a second recess between two adjacent magnetic pieces of the plurality of magnetic pieces, the second recess being for filling with a molding material to mold the rotor assembly.

8. An electric machine comprising a rotor assembly as claimed in any one of claims 1 to 7.

9. A vehicle comprising a rotor assembly as claimed in any one of claims 1 to 7, or an electric machine as claimed in claim 8.

10. An electrical device comprising a rotor assembly as claimed in any one of claims 1 to 7, or an electrical machine as claimed in claim 8.