CN116488372A - Rotor punching sheet, rotor, motor, electric power steering system and vehicle - Google Patents

Abstract

The application provides a rotor punching, a rotor, a motor, electric power steering system and vehicle, the rotor punching includes punching body and a plurality of permanent magnet groove, be equipped with the shaft hole on the punching body, a plurality of permanent magnet grooves set up on punching body around the shaft hole interval, every permanent magnet groove in a plurality of permanent magnet grooves is including the permanent magnet section and the magnetism isolation section of mutual intercommunication, the permanent magnet section is used for the permanent magnet of holding rotor, be located magnetism isolation section and punching body's periphery along the part punching body between and be magnetism isolation bridge, wherein, the width W1 of permanent magnet section, the width W2 of magnetism isolation bridge and the pole pair number P satisfy, 0.5 is less than or equal to (W2XP/W1) is less than or equal to 0.9. The rotor permanent magnetic field can be obviously restrained from passing through the magnetic leakage phenomenon of the magnetic isolation bridge, the magnetic leakage flux density of the magnetic isolation bridge is reduced, the utilization rate of the permanent magnet is increased, and therefore the quality of the motor output torque can be improved on the basis of improving the motor performance, torque pulsation is restrained, and high power density and high efficiency are achieved.

Description

Rotor punching sheet, rotor, motor, electric power steering system and vehicle

The present application is a divisional application of chinese patent application with application number "202111491567.X", entitled "rotor punching, rotor, motor, electric power steering system and vehicle", having application number of 2021, 12/8.

Technical Field

The application relates to the technical field of motor equipment, in particular to a rotor punching sheet, a rotor, a motor, an electric power steering system and a vehicle.

Background

At present, with the rapid development of society, a motor can generate driving torque as a power source of an electric appliance or various machines, thereby gaining more and more attention and advancing toward high power density and high speed.

However, the structural layout of the existing punching sheet is unreasonable, so that the torque output quality of the motor is low, the magnetic leakage phenomenon exists, the torque pulsation is high, and the motor performance needs to be improved.

Disclosure of Invention

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

To this end, a first aspect of the present application is to propose a rotor lamination.

A second aspect of the present application is to provide a rotor.

A third aspect of the present application is to provide an electric machine.

A fourth aspect of the present application is to provide an electric power steering system.

A fifth aspect of the present application is directed to a vehicle.

In view of this, according to a first aspect of the present application, there is provided a rotor sheet comprising a sheet body and a plurality of permanent magnet slots, the sheet body being provided with an axial hole, the plurality of permanent magnet slots being disposed on the sheet body around the axial hole at intervals, each of the plurality of permanent magnet slots including a permanent magnet segment and a magnetism isolating segment in communication with each other, the permanent magnet segment being for accommodating a permanent magnet of a rotor, a part of the sheet body located between the magnetism isolating segment and an outer peripheral edge of the sheet body being a magnetism isolating bridge, wherein a width W1 of the permanent magnet segment, a width W2 of the magnetism isolating bridge and an pole pair number P are satisfied, and 0.5.ltoreq (W2XP/W1). Ltoreq.0.9.

The rotor punching provided by the application comprises a punching body and a plurality of permanent magnet grooves, wherein the middle part of the punching body is provided with a shaft hole, and the shaft hole is used for accommodating a rotating shaft. The permanent magnet grooves are arranged on the punching sheet body at intervals around the shaft hole, each permanent magnet groove penetrates through the punching sheet body along the axial direction, and the permanent magnet grooves are used for accommodating the permanent magnets. Each of the plurality of permanent magnet grooves comprises a permanent magnet section and a magnetism isolating section, the permanent magnet section and the magnetism isolating section are communicated with each other, the permanent magnet section is used for accommodating a permanent magnet of the rotor, the permanent magnet is embedded in the permanent magnet section, and no permanent magnet is arranged in the magnetism isolating section, namely the magnetism isolating section is empty. The number of the magnetism isolating sections is two, and the two magnetism isolating sections are respectively communicated with two sides of the permanent magnet section. The part of the punching sheet body positioned between the magnetism isolating section and the peripheral edge of the punching sheet body is called a magnetism isolating bridge, the width of the magnetism isolating bridge is related to the width of the permanent magnet section and the pole pair number of the motor, so that the width of the magnetism isolating bridge is arranged in a reasonable range, the possibility that the rotor punching sheet deforms in the operation process of the motor due to the fact that the width of the magnetism isolating bridge is too small is avoided, the difficulty of production and preparation is too large, the magnetic leakage phenomenon of a rotor permanent magnet magnetic field passing through the magnetism isolating bridge can be remarkably restrained, the magnetic leakage density of the magnetism isolating bridge is reduced, the utilization rate of the permanent magnet is increased, the quality of motor output torque can be improved on the basis of improving the performance of the motor, torque pulsation is restrained, and high power density and high efficiency are achieved.

In one possible design, further, on the axial end face of the punching body, there is an inter-pole center line between adjacent permanent magnet slots of the plurality of permanent magnet slots. The permanent magnet groove is provided with a first vertex and a second vertex which are opposite, a first radial extension line passing through the center of the shaft hole is intersected or tangent with the first vertex, a second radial extension line passing through the center of the shaft hole is intersected or tangent with the second vertex, and the permanent magnet groove is positioned between the first radial extension line and the second radial extension line, wherein an included angle beta between the first radial extension line and the second radial extension line and an included angle alpha between the center lines between adjacent interelectrode are met, and beta/alpha is more than or equal to 0.9 and less than or equal to 0.98.

In the design, on the axial end face of the punching body, a connecting line between the center of each permanent magnet slot and the center of the shaft hole is a magnetic pole center line, the corner parting line of two adjacent magnetic pole center lines is an interelectrode center line, an included angle formed between the adjacent interelectrode center lines is a central angle alpha occupied by each magnetic pole, the central angle alpha represents the proportion of each magnetic pole occupied by the punching body, and alpha=360 DEG/2P.

Further, the permanent magnet groove comprises a first vertex and a second vertex, the first vertex and the second vertex are positioned at two opposite ends of the permanent magnet groove, the centers of the first vertex and the shaft hole are respectively positioned on a first radial extension line, the centers of the second vertex and the shaft hole are respectively positioned on a second radial extension line, an included angle formed by the first radial extension line and the second radial extension line is a central angle beta corresponding to the permanent magnet groove, namely the permanent magnet groove is completely positioned in a region formed by the first radial extension line and the second radial extension line, and the relative position of the permanent magnet groove in each magnetic pole can be determined by limiting the ratio of the corresponding central angle alpha of each magnetic pole to the corresponding central angle beta of the permanent magnet groove, so that the position arrangement of the permanent magnet groove is more reasonable, and the motor performance is further promoted.

In one possible design, further, a portion of the sheet body between adjacent ones of the plurality of permanent magnet slots is a magnetic rib, wherein a minimum width W3 of the magnetic rib is satisfied, and W2 is less than or equal to W3 is less than or equal to W1.

In the design, part of the punching sheet body positioned between two adjacent permanent magnet grooves is a magnetic rib, the specific shape of the magnetic rib is related to the specific shape of the permanent magnet groove, the width of the magnetic rib is related to the width of the magnetism isolating bridge and the width of the permanent magnet section, and each position arrangement at the periphery of the punching sheet body is more reasonable, so that the magnetic leakage phenomenon is improved, the quality of the output torque of the motor is improved, and the motor performance is further improved.

In one possible design, further, the permanent magnet segments include opposing straight slot walls and bent slot walls, the straight slot walls being disposed away from the shaft bore relative to the bent slot walls.

In this design, the permanent magnet section includes straight cell wall and the cell wall of bending, straight cell wall and the cell wall of bending distribute along radial, wherein, straight cell wall keeps away from the shaft hole setting for the cell wall of bending, and straight cell wall is close to the external setting promptly, and the cell wall of bending is close to the internal setting, and the cell wall of bending has the angle of bending, and the permanent magnet can receive the restriction of the cell wall of bending when contacting with the cell wall of bending, and then ensures the position stability of permanent magnet in the permanent magnet section, and straight cell wall is close to the external setting, thereby can make things convenient for the size processing of magnetism isolation bridge, reduce the processing degree of difficulty of rotor punching.

In one possible design, further, on the axial end face of the punching sheet body, the outer peripheral edge of the part of the punching sheet body between the adjacent inter-electrode central lines comprises an outer arc line, the outer arc line comprises a first arc section, a second arc section and a third arc section, the second arc section is respectively connected with the first arc section and the third arc section, wherein the radius R2 of the circle where the second arc section is located and the maximum radius R1 of the punching sheet body are met, and 0.3 is less than or equal to (R1-R2)/R1 is less than or equal to 0.7.

In the design, on the axial end face of the punching sheet body, the outer peripheral edge of the part of the punching sheet body positioned between adjacent interelectrode central lines comprises an outer arc line, namely, for each magnetic pole, the outer arc line corresponding to the magnetic pole is arranged on the outer peripheral edge of the punching sheet body, the outer arc line comprises a first arc section, a second arc section and a third arc section which are sequentially connected, the second arc section is positioned between the first arc section and the third arc section, wherein the radius R2 of the circle where the second arc section is positioned and the maximum radius R1 of the punching sheet body are met, and the ratio of R1 to R2/R1 is more than or equal to 0.3 and less than or equal to 0.7. When the value of (R1-R2)/R1 is within the above range, the torque ripple of the motor is at a lower level, and as the value of (R1-R2)/R1 increases, the torque ripple also tends to decrease. Meanwhile, the output torque of the motor is in a stable state and does not show obvious fluctuation, namely, when the value of (R1-R2)/R1 is in a reasonable range, the torque pulsation is enabled to be at a lower level while the output torque of the motor is not influenced, meanwhile, the torque pulsation can be reduced to a certain extent, and the noise vibration condition of the motor is improved and the motor performance is improved by weakening the torque pulsation.

The permanent magnet groove comprises a permanent magnet section and two magnetism isolating sections, wherein the first magnetism isolating section and the second magnetism isolating section are respectively communicated with two ends of the permanent magnet section, and then the corresponding relation between the permanent magnet groove and the outer arc line along the circumferential direction is that the first magnetism isolating section corresponds to the first arc section, the permanent magnet section corresponds to the second arc section, and the second magnetism isolating section corresponds to the third arc section. The number of the magnetic isolation bridges is two, namely a first magnetic isolation bridge formed by the first arc section and a second magnetic isolation bridge formed by the second arc section. When the first magnetism isolating section and the second magnetism isolating section are identical in structure, the curvatures of the first circular arc section and the third circular arc section are identical, the first magnetism isolating bridge and the second magnetism isolating bridge are identical in structure, so that each magnetic pole is of a symmetrical structure, and quality control in the production process is easy.

In one possible design, further, the included angle α between the central angle γ corresponding to the second arc segment and the center line between adjacent poles is 0.6. Ltoreq.γ/α.ltoreq.0.8.

In the design, the ratio of the central angle alpha corresponding to each magnetic pole to the central angle gamma corresponding to the second circular arc section is limited, so that the approximate shape of the peripheral circle of the punching sheet body can be rationalized, the curvature distribution of the peripheral edge corresponding to each magnetic pole is rationalized, the structure of the punching sheet body is more rationalized, and the motor performance is further improved.

In one possible design, the rotor punching sheet further includes a plurality of lightening holes, wherein the lightening holes are formed in the punching sheet body, and the lightening holes are respectively positioned on the magnetic pole center line and/or the inter-pole center line of the punching sheet body.

In this design, for one rotor sheet, it has a magnetic pole center line and an inter-pole center line, wherein the center line of the permanent magnet slot and the center of the shaft hole constitute the magnetic pole center line, abbreviated as d-axis, and the angular bisector of the adjacent two magnetic pole center lines is called inter-pole center line, also called adjacent magnetic pole center line, abbreviated as q-axis. The plurality of lightening holes are respectively positioned on the central line of the magnetic pole and/or the central line between the poles. On the premise of ensuring that the performance of the motor is not affected, the moment of inertia can be reduced by arranging the lightening holes, the overall weight of the motor is lightened, and the lightening holes are arranged on the central line of the magnetic poles and/or the central line between the poles.

The number of the lightening holes is multiple, the lightening holes are all arranged on the central line of the magnetic pole, or the lightening holes are all arranged on the central line of the interelectrode, or one part of lightening holes in the lightening holes are positioned on the central line of the magnetic pole, and the other part of lightening holes in the lightening holes are positioned on the central line of the interelectrode.

It is conceivable that the number of pole centerlines and the number of inter-pole centerlines are plural for the punch body. One lightening hole can be arranged on one magnetic pole central line, or a plurality of independent lightening holes can be arranged on one magnetic pole central line. However, there is no case where one lightening hole is located on one of the pole center line and the pole center line at the same time.

In one possible design, further, the lightening holes are located between the permanent magnet slots and the shaft holes, wherein the minimum distance W4 between the lightening holes and the permanent magnet slots, the minimum distance W5 between the lightening holes and the shaft holes, is 0.8.ltoreq.W4/W5.ltoreq.1.2.

In the design, the lightening hole is arranged between the permanent magnet groove and the shaft hole, the lightening hole is independently arranged relative to the permanent magnet groove and the shaft hole, and the center of the lightening hole, the center of the permanent magnet groove and the center of the shaft hole are all positioned on the magnetic pole central line. The minimum distance W4 between the lightening holes and the permanent magnet grooves and the minimum distance W5 between the lightening holes and the shaft holes are met, W4/W5 is more than or equal to 0.8 and less than or equal to 1.2, the position selection of the lightening holes is reasonable, the moment of inertia is reduced, the weight of the motor is reduced, and meanwhile, the performance of the motor is not influenced.

In one possible design, further, the minimum distance W4 between the lightening holes and the permanent magnet slots, the minimum distance W5 between the lightening holes and the shaft holes, the maximum radius R1 of the punching sheet body and the radius R3 of the shaft holes are satisfied with 0.4.ltoreq.W4+W5)/(R1-R3.ltoreq.0.6.

In the design, the minimum distance between the lightening hole and the permanent magnet groove is W4, the minimum distance between the lightening hole and the shaft hole is W5, the maximum radius of the punching sheet body is R1, the radius of the shaft hole is R3, and the dimensional relationship of the four satisfies the relationship, so that the effects of reducing the moment of inertia and the weight of the motor and simultaneously not influencing the performance of the motor can be realized. When the value of (w4+w5)/(R1-R3) is within the above range, the moment of inertia of the motor is at a lower level, and as (w4+w5)/(R1-R3) increases, the proportion of increase in moment of inertia is lower, i.e., within the above range, the moment of inertia of the motor can be smoothly at a lower level.

In one possible design, further, the lightening hole comprises an arc hole wall, the arc hole wall comprises an arc line positioned on the axial end face, and the radius R4 of the circle where the arc line is positioned and the maximum radius R1 of the punching sheet body are met, wherein R4/R1 is more than or equal to 0.05 and less than or equal to 0.3.

In the design, the lightening hole comprises at least one arc-shaped hole wall, the arc-shaped hole wall is provided with an arc line on the axial end face perpendicular to the axial direction, the radius R4 of the circle where the arc line is located and the maximum radius R1 of the punching sheet body meet the relational expression, so that the shape of the lightening hole is related to the punching sheet body, the size and shape selection of the lightening hole are more reasonable, the overall structure arrangement of the rotor punching sheet is optimized, and the motor performance is improved.

In one possible design, the lightening hole is further provided with a third vertex and a fourth vertex which are opposite, a third radial extension line passing through the center of the shaft hole is intersected or tangent with the third vertex, a fourth radial extension line passing through the center of the shaft hole is intersected or tangent with the fourth vertex, and the lightening hole is positioned between the third radial extension line and the fourth radial extension line, wherein an included angle theta between the third radial extension line and the fourth radial extension line and an included angle alpha between adjacent interelectrode central lines are met, and 0.6 is less than or equal to theta/alpha is less than or equal to 0.8.

In the design, the lightening hole comprises a third vertex and a fourth vertex, the third vertex and the fourth vertex are positioned at two opposite ends of the lightening hole, the centers of the third vertex and the shaft hole are respectively positioned on a third radial extension line, the centers of the fourth vertex and the shaft hole are respectively positioned on a fourth radial extension line, an included angle formed by the third radial extension line and the fourth radial extension line is the central angle theta corresponding to the lightening hole, namely the lightening hole is completely positioned in a region formed by the third radial extension line and the fourth radial extension line, and the relative position of the lightening hole in each magnetic pole can be determined by limiting the ratio of the central angle alpha corresponding to each magnetic pole to the central angle theta corresponding to the lightening hole, so that the position arrangement of the lightening hole is more reasonable, and the motor performance is further improved.

In one possible design, further, the number of lightening holes is 4, 6, 8, 12, 16 or 20.

In this design, the number of lightening holes is a plurality of possibilities, and is set according to the actual requirements, but the lightening holes may be provided only at the inter-electrode center line, regardless of the number of lightening holes. Alternatively, the lightening holes are only arranged on the central line of the magnetic pole, or at least one lightening hole of the plurality of lightening holes is positioned on the central line of the interelectrode, and at least one lightening hole of the plurality of lightening holes is positioned on the central line of the magnetic pole.

For example, when the number of lightening holes is 16, the lightening holes include 8 first lightening holes and 8 second lightening holes, the 8 first lightening holes are circumferentially spaced apart, each first lightening hole is located on a pole centerline of each pole, the 8 second lightening holes are circumferentially spaced apart, and may be located on an outer side or an inner side of the first lightening holes, and one second lightening hole is located on one pole centerline. The opening area of the first lightening hole is different from the opening area of the second lightening hole, for example, when the first lightening hole is far away from the shaft hole relative to the second lightening hole, the opening area of the first lightening hole is larger than the opening area of the second lightening hole.

The shape of the first lightening hole may be the same as or different from the shape of the second lightening hole.

In one possible design, the rotor lamination further includes a rivet portion disposed on the lamination body at a pole centerline or inter-pole centerline.

In the design, each punching sheet body is further provided with a rivet part, a plurality of rotor punching sheets are stacked along the axial direction to form a rotor core, and the rivet parts on the adjacent rotor punching sheets can be matched and matched so that the plurality of rotor punching sheets are connected with each other in the axial direction, thereby forming the whole rotor core. The lightening hole and the rivet part are relatively independently arranged on the punching body and are not mutually interfered. According to the motor output torque control method, the rivet button part and the lightening hole are formed in the punching sheet body, meanwhile, the rivet button part and the lightening hole are arranged at the same time, the rivet button part and the lightening hole are mutually related to the positions of the magnetic pole center line and the interelectrode center line, so that the quality of the motor output torque can be improved on the basis of improving the motor performance, the magnetic leakage phenomenon is improved, torque pulsation is restrained, high power density and high efficiency are achieved, the rotational inertia is reduced, and the motor weight is lightened.

The number of magnetic pole center lines and the number of inter-pole center lines are plural for the punching body. The number of the rivet parts is multiple, and one rivet part is correspondingly arranged on one magnetic pole central line or one interelectrode central line. In one possible design, further, the number of rivet portions is half the number of permanent magnet slots; or the number of the rivet parts is equal to the number of the permanent magnet grooves.

In this design, the number of rivet portions is related to the number of permanent magnet slots, and the number of rivet portions may be half the number of permanent magnet slots, or the number of rivet portions may be equal to the number of permanent magnet slots. When the number of the permanent magnet grooves is 8, the number of the rivet parts can be 4 and 8. Regardless of whether the number of rivet portions is a multiple or equal relationship to the number of permanent magnet slots, the rivet portions need to be disposed on the inter-pole centerline and/or the pole centerline.

When the weight reducing holes and the riveting parts are arranged on the punching sheet body, the weight reducing holes and the riveting parts are required to follow the principle of being arranged on the center line between poles and the center line of the magnetic poles, and the weight reducing holes and the riveting parts are relatively independent and form reasonable arrangement positions.

In one possible design, further, in the case where the number of rivet portions and the number of lightening holes are equal, the lightening holes and the rivet portions are alternately arranged in the circumferential direction.

In this design, when the number of rivet portions and the number of lightening holes are equal, for example, the number of both is half the number of permanent magnet slots, or the number of both is the same as the number of permanent magnet slots, the arrangement of both follows an alternate spaced arrangement. Specifically, when the number of the rivet portions and the number of the lightening holes are 4, the 4 rivet portions and the 4 lightening holes are alternately arranged at intervals, and the centers of the 4 rivet portions and the centers of the 4 lightening holes are located in the same circle. When the number of the rivet holes and the number of the lightening holes are 8, one of the lightening holes and the rivet holes is positioned on the central line of the magnetic pole, and the other of the lightening holes and the rivet holes is positioned on the central line of the interelectrode, and the lightening holes and the rivet holes are respectively arranged along the circumferential direction to form concentric circles with different radiuses. The weight reducing holes are arranged close to the shaft holes relative to the rivet parts, and the weight reducing holes are formed in the positions close to the rivet parts due to the fact that centrifugal force received by the peripheries of the rotor punching sheets is large in the high-rotation-speed rotation process of the rotor punching sheets, so that the rivet parts are arranged outside the rivet parts, the rotor punching sheets can be prevented from being deformed better, and the reliability of the structure is improved.

According to a second aspect of the present application, there is provided a rotor comprising a rotor sheet provided by any of the designs described above.

The rotor provided by the application comprises the rotor punching provided by any design, so that the rotor has all the beneficial effects of the rotor punching, and the description is omitted here.

The number of the rotor punching sheets is multiple, the rotor punching sheets are stacked along the axial direction to form a rotor core, the permanent magnet grooves of the rotor punching sheets are penetrated along the axial direction to form magnetic grooves, and the permanent magnets penetrate through the magnetic grooves.

According to a third aspect of the present application there is provided an electrical machine comprising a rotor provided by any of the designs described above.

The motor provided by the application comprises the rotor provided by any one of the designs, so that the motor has all the beneficial effects of the rotor, and the description is omitted herein.

It is worth noting that the motor is a permanent magnet motor.

According to a fourth aspect of the present application, there is provided an electric power steering system comprising an electric motor provided by any of the designs described above.

The electric power steering system provided by the application comprises the motor provided by any one of the designs, so that the electric power steering system has all the beneficial effects of the motor and is not described in detail herein.

It should be noted that an electric power steering system (Electric Power Steering, abbreviated as EPS) is a power steering system that directly relies on an electric motor to provide assist torque, and the EPS system has many advantages over the conventional hydraulic power steering system HPS (Hydraulic Power Steering). The EPS is mainly composed of a torque sensor, a vehicle speed sensor, a motor, a speed reduction mechanism, an Electronic Control Unit (ECU), and the like.

According to a fifth aspect of the present application there is provided a vehicle comprising a rotor blade, rotor, motor or electric power steering system as provided by any of the designs described above.

The vehicle provided by the application comprises the rotor punching sheet, the rotor, the motor or the electric power steering system provided by any one of the designs, so that the vehicle has all the beneficial effects of the rotor punching sheet, the rotor, the motor or the electric power steering system, and the details are not repeated here.

It should be noted that the vehicle may be a conventional fuel vehicle or a new energy vehicle. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

Additional aspects and advantages of the present application will become apparent in the following description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

fig. 1 shows a schematic structural view of a rotor punching sheet according to a first embodiment of the present application;

fig. 2 shows one of partial schematic structural views of a rotor punching sheet according to a first embodiment of the present application;

FIG. 3 shows a second schematic view of a portion of a rotor blade according to a first embodiment of the present application;

FIG. 4 shows a schematic diagram of torque of an electric machine and stress at a magnetically isolated bridge as a function of variable (W2×P/W1) in accordance with one embodiment of the present application;

FIG. 5 shows a schematic diagram of torque and torque ripple of an electric machine as a function of variables (R1-R2)/R1 in accordance with one embodiment of the present application;

FIG. 6 shows a schematic diagram of the moment of inertia of a motor as a function of the variables (W4+W5)/(R1-R3) according to one embodiment of the present application;

fig. 7 shows a schematic structural view of a rotor punching sheet according to a second embodiment of the present application;

fig. 8 shows a schematic structural view of a rotor punching sheet according to a third embodiment of the present application;

fig. 9 shows a schematic structural view of a rotor punching sheet according to a fourth embodiment of the present application;

Fig. 10 shows a schematic structural view of a rotor punching sheet according to a fifth embodiment of the present application;

fig. 11 shows a schematic structural view of an electric power steering system according to an embodiment of the present application.

Reference numerals:

100-degree rotor punching sheet, wherein the number of the rotor punching sheets is 100,

110 the body of the punching sheet,

111, 111a first magnetic bridge, 111b second magnetic bridge,

112 the magnetic ribs,

113 first arc segment, 114 second arc segment, 115 third arc segment,

the shaft hole of the valve is 120,

130 a permanent magnet slot,

131 permanent magnet segments, 1311 straight groove walls, 1312 bent groove walls,

132, 132a first magnetic shield, 132b a second magnetic shield,

140 of the rivet fastening parts,

a weight-reducing hole 150 is formed in the hollow body,

200 an electric power steering system,

211 steering wheel, 212 steering shaft, 213 universal joint, 214 rotation shaft, 215 rack and pinion mechanism, 216 rack shaft, 217 wheels,

221 steering torque sensor, 222 control unit, 223 retarding mechanism.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the 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 application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

A rotor sheet 100, a rotor, a motor, an electric power steering system 200, and a vehicle provided according to some embodiments of the present application are described below with reference to fig. 1 to 11.

According to an embodiment of the first aspect of the present application, as shown in fig. 1, 2, 3 and 4, there is provided a rotor sheet 100, including a sheet body 110 and a plurality of permanent magnet slots 130, wherein the sheet body 110 is provided with a shaft hole 120, the plurality of permanent magnet slots 130 are arranged on the sheet body 110 at intervals around the shaft hole 120, each of the plurality of permanent magnet slots 130 includes a permanent magnet segment 131 and a magnetism isolating segment 132 which are mutually communicated, the permanent magnet segment 131 is used for accommodating a permanent magnet of a rotor, and a part of the sheet body 110 between the magnetism isolating segment 132 and an outer peripheral edge of the sheet body 110 is a magnetism isolating bridge 111, wherein a width W1 of the permanent magnet segment 131, a width W2 of the magnetism isolating bridge 111, and a pole P satisfy, and a number of pairs of numbers P is 0.5 (w2xp/w1) is less than or equal to 0.9.

The rotor punching sheet 100 provided by the application comprises a punching sheet body 110, a plurality of permanent magnet grooves 130, a rivet portion 140 and a lightening hole 150, wherein a shaft hole 120 is formed in the middle of the punching sheet body 110, and the shaft hole 120 is used for accommodating a rotating shaft. A plurality of permanent magnet slots 130 are arranged on the punching body 110 at intervals around the shaft hole 120, each permanent magnet slot 130 is arranged to penetrate through in the axial direction, and the permanent magnet slots 130 are used for accommodating permanent magnets. Each permanent magnet slot 130 of the plurality of permanent magnet slots 130 comprises a permanent magnet segment 131 and a magnetism isolating segment 132, the permanent magnet segment 131 and the magnetism isolating segment 132 are communicated with each other, the permanent magnet segment 131 is used for accommodating a permanent magnet of a rotor, the permanent magnet is embedded in the permanent magnet segment 131, no permanent magnet is arranged in the magnetism isolating segment 132, namely the magnetism isolating segment 132 is empty. The number of the magnetism isolating sections 132 is two, and the two magnetism isolating sections 132 are respectively communicated with two sides of the permanent magnet section 131. The part of the sheet body 110 between the magnetic isolation section 132 and the peripheral edge of the sheet body 110 is called a magnetic isolation bridge 111, and the width of the magnetic isolation bridge 111 is related to the width of the permanent magnet section 131 and the pole pair number of the motor, so that the width of the magnetic isolation bridge 111 can be set in a reasonable range, the possibility that the rotor sheet 100 deforms in the operation process of the motor due to too small width of the magnetic isolation bridge 111 and too large difficulty in the production and preparation process is avoided, the magnetic leakage phenomenon of the rotor permanent magnetic field through the magnetic isolation bridge 111 can be obviously inhibited, the magnetic leakage density of the magnetic isolation bridge 111 is reduced, the utilization rate of the permanent magnet is increased, the quality of the output torque of the motor can be improved on the basis of ensuring the performance of the motor, the magnetic leakage phenomenon is improved, torque pulsation is inhibited, and high power density and high efficiency are realized.

As shown in fig. 4, when (w2×p/W1) is smaller than 0.5, the stress received at the magnetism isolating bridge is large, and deformation easily occurs during operation of the motor. When (w2×p/W1) is greater than 0.9, although the stress at the magnetism-isolating bridge exhibits a decreasing tendency, the output torque of the motor decreases, resulting in failure to secure the output quality of the motor. When the value range of (W2 xP/W1) is between [0.5,0.9], the stress at the magnetism isolating bridge is at a lower level, and meanwhile the torque is at a relatively stable level, namely no obvious reduction occurs, so that the stress at the magnetism isolating bridge and the output torque of the motor can be ensured to be in the preferred range in the range, the quality of the output torque of the motor can be improved on the basis of ensuring the performance of the motor, the magnetic leakage phenomenon is improved, the torque pulsation is restrained, and the high power density and the high efficiency are realized.

Further, as shown in fig. 1, 2 and 3, on the axial end face of the punch body 110, an inter-pole center line is provided between adjacent permanent magnet slots 130 among the plurality of permanent magnet slots 130. The permanent magnet slot 130 is provided with a first vertex and a second vertex which are opposite, a first radial extension line passing through the center of the shaft hole 120 is intersected or tangent with the first vertex, a second radial extension line passing through the center of the shaft hole 120 is intersected or tangent with the second vertex, and the permanent magnet slot 130 is positioned between the first radial extension line and the second radial extension line, wherein an included angle beta between the first radial extension line and the second radial extension line and an included angle alpha between adjacent interelectrode central lines are met, and beta/alpha is more than or equal to 0.9 and less than or equal to 0.98.

In this embodiment, on the axial end surface of the punching body 110, a line between the center of each permanent magnet slot 130 and the center of the shaft hole 120 is a magnetic pole center line, an angle line of two adjacent magnetic pole center lines is an inter-pole center line, an included angle formed between two adjacent inter-pole center lines is a central angle α occupied by each magnetic pole, the central angle α represents a proportion of each magnetic pole occupied by the punching body 110, and α=360°/2P.

Further, the permanent magnet slot 130 includes a first vertex and a second vertex, where the first vertex and the second vertex are located at opposite ends of the permanent magnet slot 130, the centers of the first vertex and the shaft hole 120 are located on a first radial extension line, the centers of the second vertex and the shaft hole 120 are located on a second radial extension line, respectively, an included angle formed by the first radial extension line and the second radial extension line is a central angle β corresponding to the permanent magnet slot 130, that is, the permanent magnet slot 130 is completely located in a region formed by the first radial extension line and the second radial extension line, and the relative position of the permanent magnet slot 130 in each magnetic pole can be determined by limiting the ratio of the corresponding central angle α of each magnetic pole to the corresponding central angle β of the permanent magnet slot 130, so that the position arrangement of the permanent magnet slot 130 is more reasonable, and the motor performance is further improved.

Further, as shown in fig. 1, 2 and 3, a part of the sheet body 110 between adjacent permanent magnet slots 130 of the plurality of permanent magnet slots 130 is a magnetic rib 112, wherein a minimum width W3 of the magnetic rib 112 is satisfied, and W2 is equal to or less than W3 is equal to or less than W1.

In this embodiment, the part of the punching body 110 located between two adjacent permanent magnet slots 130 is the magnetic rib 112, the specific shape of the magnetic rib 112 is related to the specific shape of the permanent magnet slot 130, and the width of the magnetic rib 112 is related to the width of the magnetism isolating bridge 111 and the width of the permanent magnet segment 131, so that each position arrangement at the periphery of the punching body 110 is more reasonable, thereby being beneficial to improving the magnetic leakage phenomenon, improving the quality of the output torque of the motor, and further improving the performance of the motor.

Further, as shown in fig. 1, 2 and 3, the permanent magnet segment 131 includes opposing straight slot walls 1311 and bent slot walls 1312, the straight slot walls 1311 being disposed away from the shaft bore 120 relative to the bent slot walls 1312.

In this embodiment, the permanent magnet segment 131 includes a straight slot wall 1311 and a bent slot wall 1312, where the straight slot wall 1311 and the bent slot wall 1312 are distributed along a radial direction, and the straight slot wall 1311 is disposed away from the shaft hole 120 relative to the bent slot wall 1312, that is, the straight slot wall 1311 is disposed outside, the bent slot wall 1312 is disposed inside, the bent slot wall 1312 has a bending angle, and when the permanent magnet contacts the bent slot wall 1312, the permanent magnet is limited by the bent slot wall 1312, so as to ensure the position stability of the permanent magnet in the permanent magnet segment 131, and the straight slot wall 1311 is disposed outside, thereby being capable of facilitating the dimension processing of the magnetic isolation bridge 111 and reducing the processing difficulty of the rotor punching sheet 100.

Further, as shown in fig. 5, on the axial end face of the punch body 110, the outer peripheral edge of the part of the punch body 110 located between the adjacent inter-electrode center lines includes an outer arc line, the outer arc line includes a first arc segment 113, a second arc segment 114 and a third arc segment 115, the second arc segment 114 is respectively connected with the first arc segment 113 and the third arc segment 115, wherein the radius R2 of the circle where the second arc segment 114 is located and the maximum radius R1 of the punch body 110 meet, and 0.3 (R1-R2)/R1 is less than or equal to 0.7.

In this embodiment, on the axial end face of the sheet body 110, the outer peripheral edge of the sheet body 110 located between the adjacent inter-pole center lines includes an outer arc, that is, for each magnetic pole, the outer peripheral edge of the sheet body 110 has an outer arc corresponding to the magnetic pole, the outer arc includes a first arc segment 113, a second arc segment 114 and a third arc segment 115 connected in sequence, the second arc segment 114 is located between the first arc segment 113 and the third arc segment 115, wherein the radius R3 of the circle where the second arc segment 114 is located and the maximum radius R1 of the sheet body 110 satisfy, and 0.3+ (R1-R2)/R1+.7. As shown in fig. 5, when the value of (R1-R2)/R1 is within the above range, the torque ripple of the motor is at a lower level, and as the value of (R1-R2)/R1 increases, the torque ripple also tends to decrease. Meanwhile, the output torque of the motor is in a stable state and does not show obvious fluctuation, namely, when the value of (R1-R2)/R1 is in a reasonable range, the torque pulsation is enabled to be at a lower level while the output torque of the motor is not influenced, meanwhile, the torque pulsation can be reduced to a certain extent, and the noise vibration condition of the motor is improved and the motor performance is improved by weakening the torque pulsation.

It should be noted that, the permanent magnet slot 130 includes a permanent magnet segment 131 and two magnetism isolating segments 132, which are a first magnetism isolating segment 132a and a second magnetism isolating segment 132b, respectively, and are respectively connected to two ends of the permanent magnet segment 131, so that, in the circumferential direction, the corresponding relationship between the permanent magnet slot 130 and the outer arc line is that the first magnetism isolating segment 132a corresponds to the first arc segment 113, the permanent magnet segment 131 corresponds to the second arc segment 114, and the second magnetism isolating segment 132b corresponds to the third arc segment 115. The number of the magnetic isolation bridges 111 is two, namely a first magnetic isolation bridge 111a formed by the first arc section 113 and a second magnetic isolation bridge 111b formed by the second arc section 114. When the first magnetic isolation segment 132a and the second magnetic isolation segment 132b have the same structure, and the curvatures of the first arc segment 113 and the third arc segment 115 are the same, the structures of the first magnetic isolation bridge 111a and the second magnetic isolation bridge 111b are the same, so that each magnetic pole has a symmetrical structure, and quality control in the production process is easy.

Further, as shown in fig. 1, 2 and 3, the included angle α between the central angle γ corresponding to the second arc segment 114 and the center line between adjacent poles is 0.6. Ltoreq.γ/α.ltoreq.0.8.

In this embodiment, the ratio of the central angle α corresponding to each magnetic pole to the central angle γ corresponding to the second circular arc segment 114 is defined, so that the approximate shape of the outer circumference of the punching body 110 can be designed reasonably for the curvature distribution of the outer circumference edge corresponding to each magnetic pole, so that the structure of the punching body 110 is more reasonable, and the improvement of the motor performance is facilitated.

In some embodiments of the present application, the rotor punching sheet further includes a plurality of lightening holes 150, wherein the lightening holes 150 are disposed on the punching sheet body 110, and the lightening holes 150 are respectively located on the magnetic pole center line and/or the inter-pole center line of the punching sheet body 110.

In this embodiment, for one rotor sheet 100, it has a magnetic pole center line and an inter-pole center line, wherein the line connecting the center of the permanent magnet slot 130 and the center of the shaft hole 120 constitutes the magnetic pole center line, abbreviated as d-axis, and the angular bisector of the adjacent two magnetic pole center lines is the inter-pole center line, which is also called the adjacent magnetic pole center line, abbreviated as q-axis. The plurality of lightening holes 150 are respectively provided on the pole center line and/or the pole center line of the punch body 110. Under the premise of ensuring that the motor performance is not affected, the arrangement of the weight reducing holes 150 can reduce the moment of inertia and the overall weight of the motor.

The number of the lightening holes 150 is a plurality, the lightening holes 150 are all arranged on the central line of the magnetic pole, or the lightening holes 150 are all arranged on the central line of the inter-pole, or one part of the lightening holes 150 in the lightening holes 150 are positioned on the central line of the magnetic pole, and the other part of the lightening holes 150 in the lightening holes 150 are positioned on the central line of the inter-pole.

It is conceivable that the number of pole centerlines and the number of inter-pole centerlines are plural for the punch body 110. One lightening hole 150 may be provided on one magnetic pole center line, or a plurality of relatively independent lightening holes 150 may be provided on one magnetic pole center line. However, for one lightening hole 150, it is located on only one of the pole center line or the pole center line, and there is no case where one lightening hole 150 is located on both the pole center line and the pole center line.

Further, as shown in FIGS. 1, 2 and 3, the weight reducing hole 150 is located between the permanent magnet slot 130 and the shaft hole 120, wherein the minimum distance W4 between the weight reducing hole 150 and the permanent magnet slot 130, and the minimum distance W5 between the weight reducing hole 150 and the shaft hole 120 are satisfied, and 0.8.ltoreq.W4/W5.ltoreq.1.2.

In this embodiment, the weight reducing hole 150 is opened between the permanent magnet slot 130 and the shaft hole 120, the weight reducing hole 150 is independently provided with respect to the permanent magnet slot 130 and the shaft hole 120, and the center of the weight reducing hole 150, the center of the permanent magnet slot 130, and the center of the shaft hole 120 are all located on the magnetic pole center line. Wherein, the minimum distance W4 between the lightening hole 150 and the permanent magnet slot 130 and the minimum distance W5 between the lightening hole 150 and the shaft hole 120 are satisfied, W4/W5 is more than or equal to 0.8 and less than or equal to 1.2, and the position selection of the lightening hole 150 is reasonable, thereby reducing the moment of inertia, lightening the weight of the motor and simultaneously not affecting the performance of the motor.

Further, as shown in FIG. 6, the minimum distance W4 between the lightening hole 150 and the permanent magnet slot 130, the minimum distance W5 between the lightening hole 150 and the shaft hole 120, the maximum radius R1 of the punch body 110, the radius R3 of the shaft hole 120 satisfy 0.4.ltoreq.W4+W5)/(R1-R3.ltoreq.0.6.

In this embodiment, the minimum distance between the lightening hole 150 and the permanent magnet slot 130 is W4, the minimum distance between the lightening hole 150 and the shaft hole 120 is W5, the maximum radius of the punching body 110 is R1, the radius of the shaft hole 120 is R3, and the dimensional relationship of the four satisfies the above relationship, so that it is possible to reduce the moment of inertia and the weight of the motor without affecting the performance of the motor. As shown in fig. 6, when the value of (w4+w5)/(R1-R3) is within the above range, the rotational inertia of the motor is at a low level, and as (w4+w5)/(R1-R3) increases, the ratio of increase in rotational inertia is low, i.e., within the above range, the rotational inertia of the motor can be smoothly at a low level.

Further, as shown in fig. 1, 2 and 3, the lightening hole 150 includes an arc hole wall, the arc hole wall includes an arc line on an axial end surface, and a radius R4 of a circle where the arc line is located and a maximum radius R1 of the punching body 110 are satisfied, where R4/R1 is 0.05-0.3.

In this embodiment, the lightening hole 150 includes at least one arc hole wall, the arc hole wall has an arc line on the axial end surface perpendicular to the axial direction, the radius R4 of the circle where the arc line is located and the maximum radius R1 of the punching body 110 satisfy the above relation, so that the shape of the lightening hole 150 is associated with the punching body 110, the size and shape selection of the lightening hole 150 are more reasonable, and the overall structure arrangement of the rotor punching 100 is optimized, which is helpful for improving the motor performance.

Further, as shown in fig. 1, 2 and 3, the lightening hole 150 is provided with a third vertex and a fourth vertex which are opposite, a third radial extension line passing through the center of the shaft hole 120 is intersected or tangent with the third vertex, a fourth radial extension line passing through the center of the shaft hole 120 is intersected or tangent with the fourth vertex, and the lightening hole 150 is positioned between the third radial extension line and the fourth radial extension line, wherein an included angle θ between the third radial extension line and the fourth radial extension line and an included angle α between adjacent inter-electrode center lines are satisfied, and θ/α is more than or equal to 0.6 and less than or equal to 0.8.

In this embodiment, the lightening hole 150 includes a third vertex and a fourth vertex, the third vertex and the fourth vertex are located at opposite ends of the lightening hole 150, the centers of the third vertex and the shaft hole 120 are located on a third radial extension line, the centers of the fourth vertex and the shaft hole 120 are located on a fourth radial extension line, respectively, an included angle formed by the third radial extension line and the fourth radial extension line is a central angle θ corresponding to the lightening hole 150, that is, the lightening hole 150 is completely located in a region formed by the third radial extension line and the fourth radial extension line, and the ratio of the central angle α corresponding to each magnetic pole and the central angle θ corresponding to the lightening hole 150 is defined, so that the relative position of the lightening hole 150 in each magnetic pole can be determined, the position of the lightening hole 150 is more rationalized, and the motor performance is further improved.

Further, as shown in fig. 1, 7, 8, 9 and 10, the number of lightening holes 150 is 4, 6, 8, 12, 16 or 20.

In this embodiment, the number of lightening holes 150 is 4. Alternatively, the number of lightening holes 150 is 6. Alternatively, the number of lightening holes 150 is 8. Alternatively, the number of lightening holes 150 is 12. Alternatively, the number of lightening holes 150 is 16. Alternatively, the number of lightening holes 150 is 20. Regardless of the number of lightening holes 150, the lightening holes 150 need to be provided on the inter-pole center line and/or the pole center line.

For example, when the number of the lightening holes 150 is 16, the lightening holes 150 include 8 first lightening holes and 8 second lightening holes, the 8 first lightening holes are circumferentially spaced apart, each first lightening hole is located on a pole centerline of each pole, the 8 second lightening holes are circumferentially spaced apart, and may be located at an outer side or an inner side of the first lightening holes, and one second lightening hole is located on one pole centerline. Wherein, the open area of the first lightening hole is different from the open area of the second lightening hole, for example, when the first lightening hole is far away from the shaft hole 120 relative to the second lightening hole, the open area of the first lightening hole is larger than the open area of the second lightening hole.

The shape of the first lightening hole may be the same as or different from the shape of the second lightening hole.

In some embodiments of the present application, further, the rotor punching sheet 100 further includes a rivet portion 140, the rivet portion 140 being disposed on the punching sheet body 110, the rivet portion 140 being located on a magnetic pole center line or an inter-pole center line of the punching sheet body 110.

In this embodiment, each of the punch bodies 110 is further provided with a rivet portion 140, and a plurality of rotor punches 100 are stacked in the axial direction to form a rotor core, and the rivet portions 140 on adjacent rotor punches 100 can be matched to connect the plurality of rotor punches 100 to each other in the axial direction, thereby forming the rotor core as a whole. The lightening hole 150 and the rivet portion 140 are independently formed on the punching body 110, and do not interfere with each other. The lightening holes 150 are provided on the pole center line and/or the inter-pole center line. According to the method, the rivet button part 140 and the lightening hole 150 are arranged on the punching sheet body 110, meanwhile, the rivet button part 140 and the lightening hole 150 are arranged at the same time and are mutually related to the positions of the magnetic pole center line and the interelectrode center line, so that the quality of the motor output torque can be improved on the basis of improving the motor performance, the magnetic leakage phenomenon is improved, the torque pulsation is restrained, the high power density and the high efficiency are realized, the rotational inertia is reduced, and the motor weight is lightened.

Note that, the number of magnetic pole center lines and the number of inter-pole center lines are plural in the punch body 110. The number of the rivet portions 140 is plural, and one rivet portion 140 is correspondingly disposed on one magnetic pole center line or one inter-pole center line.

Further, as shown in fig. 1, 7, 8, 9 and 10, the number of rivet portions 140 is half the number of permanent magnet slots 130; alternatively, the number of rivet portions 140 is equal to the number of permanent magnet slots 130.

In this embodiment, the number of the rivet portions 140 is related to the number of the permanent magnet slots 130, and the number of the rivet portions 140 may be half the number of the permanent magnet slots 130, or the number of the rivet portions 140 may be equal to the number of the permanent magnet slots 130. When the number of the permanent magnet slots 130 is 8, the number of the rivet portions 140 may be 4 or 8. Regardless of whether the number of rivet portions 140 is a multiple or equal to the number of permanent magnet slots 130, the rivet portions 140 need to be disposed on the inter-pole centerline and/or the pole centerline.

When the plurality of lightening holes 150 and the plurality of rivet portions 140 are provided on the punching body 110, the lightening holes 150 and the rivet portions 140 are required to follow the principle of being arranged on the center line between poles and the center line of magnetic poles, and the lightening holes 150 and the rivet portions 140 are relatively independent and form respective reasonable arrangement positions.

Further, as shown in fig. 1, 7, 8, 9 and 10, in the case where the number of rivet portions 140 and the number of lightening holes 150 are equal, the lightening holes 150 and the rivet portions 140 are alternately arranged in the circumferential direction.

In this embodiment, when the number of rivet portions 140 and the number of lightening holes 150 are equal, for example, both are half the number of permanent magnet slots 130, or both are the same as the number of permanent magnet slots 130, the arrangement thereof follows an alternate spaced arrangement. Specifically, when the number of the rivet portions 140 and the number of the lightening holes 150 are 4, the 4 rivet portions 140 and the 4 lightening holes 150 are alternately arranged at intervals, and the centers of the 4 rivet portions 140 and the centers of the 4 lightening holes 150 are located in the same circle. When the number of the rivet portions 140 and the number of the lightening holes 150 are 8, one of the lightening holes 150 and the rivet portions 140 is located on the magnetic pole center line, and the other of the lightening holes 150 and the rivet portions 140 is located on the interelectrode center line, and the two concentric circles with different radii are formed along the circumferential direction. The lightening hole 150 is disposed near the shaft hole 120 relative to the rivet portion 140, which is because the centrifugal force applied to the periphery of the rotor sheet 100 is large during the high-rotation process of the rotor sheet 100, so that the rivet portion 140 is disposed outside, thereby better ensuring that the rotor sheet 100 is not deformed and improving the reliability of the structure.

According to an embodiment of the second aspect of the present application, a rotor is provided comprising a rotor sheet 100 provided by any of the designs described above.

The rotor provided by the present application, including the rotor punching sheet 100 provided by any one of the above designs, has all the beneficial effects of the rotor punching sheet 100, and is not described herein again.

The number of the rotor punching sheets 100 is plural, the rotor punching sheets 100 are stacked along the axial direction to form a rotor core, the permanent magnet slots 130 of the rotor punching sheets 100 are penetrated along the axial direction to form magnetic slots, and the permanent magnets are penetrated in the magnetic slots.

According to an embodiment of the third aspect of the present application, there is provided an electric machine comprising a rotor provided by any of the designs described above.

The motor provided by the application comprises the rotor provided by any one of the designs, so that the motor has all the beneficial effects of the rotor, and the description is omitted herein.

It is worth noting that the motor is a permanent magnet motor.

According to an embodiment of the fourth aspect of the present application, as shown in fig. 11, there is provided an electric power steering system 200 comprising an electric motor provided by any of the designs described above.

The electric power steering system 200 provided in the present application includes the motor provided by any one of the above designs, so that the electric power steering system has all the beneficial effects of the motor, and will not be described herein.

It should be noted that, the electric power steering system 200 (Electric Power Steering, abbreviated as EPS) is a power steering system that directly relies on a motor to provide an assist torque, and compared with the conventional hydraulic power steering system HPS (Hydraulic Power Steering), the EPS system has a simple structure, is flexible to assemble, can save energy and protect environment, and is basically configured for most types of modern vehicles.

Specifically, the EPS system of the present embodiment has a steering system and an assist torque mechanism that generates assist torque. The EPS system generates assist torque that assists steering torque of a steering system generated by a driver operating a steering wheel. By the assist torque, the burden of the operation of the driver is reduced.

The steering system specifically includes a steering wheel 211, a steering shaft 212, a universal joint 213, a rotating shaft 214, a rack and pinion mechanism 215, a rack shaft 216, left and right steering wheels 217, and the like.

The assist torque mechanism specifically includes a steering torque sensor 221, an Electronic Control Unit (ECU) 222 for an automobile, a motor, a speed reduction mechanism 223, and the like. Specifically, the steering torque sensor 221 detects the steering torque of the steering system. The control unit 222 generates a drive signal based on the detection signal of the steering torque sensor 221. The motor generates an assist torque corresponding to the steering torque based on the drive signal. The electric machine transmits the generated assist torque to the steering system via the reduction mechanism 223.

According to an embodiment of the fifth aspect of the present application, there is provided a vehicle comprising a rotor punching 100, a rotor, a motor or an electric power steering system provided by any of the designs described above.

The vehicle provided by the application comprises the rotor punching sheet 100, the rotor, the motor or the electric power steering system provided by any one of the designs, so that the vehicle has all the beneficial effects of the rotor punching sheet 100, the rotor, the motor or the electric power steering system, and the details are not repeated here.

It should be noted that the vehicle may be a conventional fuel vehicle or a new energy vehicle. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

In the present application, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, 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 application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. 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 foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (18)

1. A rotor punching sheet, comprising:

the punching sheet body is provided with a shaft hole;

the permanent magnet grooves are arranged on the punching sheet body at intervals around the shaft hole;

each permanent magnet groove in the plurality of permanent magnet grooves comprises a permanent magnet section and a magnetism isolating section which are communicated with each other, and the permanent magnet section is used for accommodating a permanent magnet;

An interelectrode center line is arranged between adjacent permanent magnet grooves in the plurality of permanent magnet grooves on the axial end face of the punching sheet body;

the outer peripheral edge of the part of the punching sheet body positioned between the center lines between adjacent poles comprises an outer arc line, the outer arc line comprises a first arc section, a second arc section and a third arc section, the second arc section is respectively connected with the first arc section and the third arc section,

the maximum radius R1 of the punching body, the radius R2 of the circle where the second arc section is located, satisfies: R1-R2 is more than or equal to 0.3 and R1 is more than or equal to 0.7.

2. The rotor punching of claim 1, wherein the rotor is,

the permanent magnet slot is provided with a first vertex and a second vertex which are opposite, a first radial extension line passing through the center of the shaft hole is intersected or tangent with the first vertex, a second radial extension line passing through the center of the shaft hole is intersected or tangent with the second vertex, the permanent magnet slot is positioned between the first radial extension line and the second radial extension line,

wherein the included angle alpha between the center lines between adjacent poles and the included angle beta between the first radial extension line and the second radial extension line are satisfied,

0.9≤β/α≤0.98。

3. The rotor punching sheet of claim 2, wherein,

the part of the punching sheet body positioned between the magnetism isolating section and the peripheral edge of the punching sheet body is a magnetism isolating bridge, the width W1 of the permanent magnet section and the width W2 of the magnetism isolating bridge are magnetic ribs, the minimum width W3 of the magnetic ribs is met, and W2 is less than or equal to W3 and less than or equal to W1.

4. The rotor punching sheet of claim 2, wherein,

the permanent magnet segments comprise opposite straight slot walls and bent slot walls, and the straight slot walls are arranged far away from the shaft holes relative to the bent slot walls.

5. The rotor punching of claim 1, wherein the rotor is,

the included angle alpha between the central angle gamma corresponding to the second arc section and the central line between adjacent electrodes is satisfied,

0.6≤γ/α≤0.8。

6. the rotor sheet according to any one of claims 1 to 5, further comprising:

the weight reducing holes are arranged on the punching sheet body and are respectively positioned on the central line of the magnetic pole and/or the central line between the poles of the punching sheet body.

7. The rotor punching of claim 6, wherein the rotor is,

The weight reducing hole is positioned between the permanent magnet slot and the shaft hole, wherein the minimum distance W4 between the weight reducing hole and the permanent magnet slot, the minimum distance W5 between the weight reducing hole and the shaft hole, the maximum radius R1 of the punching sheet body and the radius R3 of the shaft hole are satisfied,

0.4≤(W4+W5)/(R1-R3)≤0.6。

8. the rotor punching of claim 7, wherein the rotor is,

the minimum distance W4 between the lightening hole and the permanent magnet slot, the minimum distance W5 between the lightening hole and the shaft hole are satisfied,

0.8≤W4/W5≤1.2。

9. the rotor punching of claim 7, wherein the rotor is,

the lightening hole comprises an arc hole wall, the arc hole wall comprises an arc line positioned on the axial end surface, the radius R4 of the circle where the arc line is positioned and the maximum radius R1 of the punching sheet body are satisfied,

0.05≤R4/R1≤0.3。

10. the rotor punching of claim 7, wherein the rotor is,

the weight reducing hole is provided with a third vertex and a fourth vertex which are opposite, a third radial extension line passing through the center of the shaft hole is intersected or tangent with the third vertex, a fourth radial extension line passing through the center of the shaft hole is intersected or tangent with the fourth vertex, the weight reducing hole is positioned between the third radial extension line and the fourth radial extension line,

Wherein the included angle theta between the third radial extension line and the fourth radial extension line is satisfied with the included angle alpha between the center line between adjacent poles,

0.6≤θ/α≤0.8。

11. the rotor punching of claim 6, wherein the rotor is,

the number of lightening holes is 4, 6, 8, 12, 16 or 20.

12. The rotor sheet according to any one of claims 7 to 11, further comprising:

the riveting part is arranged on the punching sheet body and is positioned on the center line of the magnetic pole or the center line between the poles.

13. The rotor as recited in claim 12, wherein,

the number of the rivet parts is half of the number of the permanent magnet grooves; or (b)

The number of the rivet parts is equal to the number of the permanent magnet grooves.

14. The rotor as recited in claim 12, wherein,

and under the condition that the number of the rivet parts is equal to the number of the lightening holes, the lightening holes and the rivet parts are alternately arranged along the circumferential direction.

15. A rotor, comprising: a rotor sheet according to any one of claims 1 to 14.

16. An electric machine, comprising: a rotor as claimed in claim 15.

17. An electric power steering system, comprising: the electric machine of claim 16.

18. A vehicle, characterized by comprising:

a rotor sheet according to any one of claims 1 to 14; or (b)

The rotor of claim 15; or (b)

The electric machine of claim 16; or (b)

An electric power steering system in accordance with claim 17.