CN221574975U - Rotor punching sheet, rotor core, rotor and motor - Google Patents

Abstract

The application discloses a rotor punching sheet, a rotor iron core, a rotor and a motor, and belongs to the technical field of electrical equipment. The rotor punching sheet includes: the punching sheet comprises a punching sheet body, wherein a plurality of pole arc sections are arranged at intervals along the circumferential direction on the periphery of the punching sheet body, a mounting groove for mounting a permanent magnet is formed in the inner side of each pole arc section, two adjacent pole arc sections are connected through an intersecting shaft section and a magnetic isolation bridge, the magnetic isolation bridge is connected to two ends of the intersecting shaft section, the pole arc sections are connected with the magnetic isolation bridge through transition magnetic bridges located on the outer side of the mounting groove, gaps are formed in the connecting positions of the pole arc sections and the adjacent transition magnetic bridges to the region of the middle of the pole arc sections, and the gaps are located in the peripheral wall of the punching sheet body. Through the arrangement of the transition magnetic bridge and the notch, the sine degree of the air-gap magnetic field is effectively improved, the cogging torque and the torque pulsation of the motor are obviously improved, the vibration noise of the motor is reduced, and the working performance of the motor is favorably optimized.

Description

Rotor punching sheet, rotor core, rotor and motor

Technical Field

The application belongs to the technical field of electrical equipment, and particularly relates to a rotor punching sheet, a rotor iron core, a rotor and a motor.

Background

As a power source of an electric appliance or various mechanical structures, the motor can generate driving torque, and the design requirement of the motor is higher in torque density and better in performance. However, when the motor is designed, the torque output quality of the motor is difficult to be considered while the higher torque output is pursued, so that the motor is easy to have the problem of high cogging torque and high torque pulsation, and large vibration noise is caused, so that the motor cannot meet the application requirements.

Disclosure of utility model

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides the rotor punching sheet, the rotor iron core, the rotor and the motor, which obviously improve the cogging torque and the torque pulsation of the motor on the premise of ensuring that the output torque is not obviously reduced, and are beneficial to optimizing the working performance of the motor.

In a first aspect, the present application provides a rotor sheet comprising:

The punching sheet comprises a punching sheet body, wherein a plurality of pole arc sections are arranged at intervals along the circumferential direction on the periphery of the punching sheet body, a mounting groove for mounting a permanent magnet is formed in the inner side of each pole arc section, two adjacent pole arc sections are connected through an intersecting shaft section and a magnetic isolation bridge, the magnetic isolation bridge is connected to two ends of the intersecting shaft section, the pole arc sections are connected with the magnetic isolation bridge through transition magnetic bridges located on the outer side of the mounting groove, gaps are formed in the connecting positions of the pole arc sections and the adjacent transition magnetic bridges to the region of the middle of the pole arc sections, and the gaps are located in the peripheral wall of the punching sheet body.

According to the rotor punching sheet, through the arrangement of the pole arc sections, the transition magnetic bridge, the magnetism isolating bridge and the gaps, the sine degree of an air gap magnetic field is effectively improved under the condition that the output torque of a motor is not influenced, so that the cogging torque and the torque pulsation of the motor are obviously improved, the vibration noise of the motor is reduced, and the working performance of the motor is favorably optimized.

According to one embodiment of the application, the polar arc section is provided with at least one pair of notches in the area from the connection part of the polar arc section and the adjacent transition magnetic bridge to the middle part of the polar arc section, and two notches in any pair of notches are symmetrically arranged along the central axis of the polar arc section.

According to the rotor punching sheet, through the arrangement of the at least one pair of notches, the sine degree of an air gap magnetic field is further improved by matching with the structural design that two notches in each pair of notches are symmetrically arranged along the central axis of a pole arc section, so that cogging torque and torque pulsation are more uniform at all positions, the performance of the whole motor is optimized as much as possible, and different notch position design schemes can be selected according to actual requirements, so that the flexibility and the diversity of the rotor punching sheet in structure are improved.

According to one embodiment of the application, both of said indentations in any pair of indentations are identical in shape and size.

According to the rotor punching sheet, through the shape and the size design of the two notches in each pair of notches, the positions and the shapes of the two notches in any pair of notches corresponding to the pole arc sections can be symmetrical, so that the uniformity of the sine degree of each part of the air gap magnetic field is improved, and the optimization effect of cogging torque and torque pulsation is improved.

According to one embodiment of the application, the notches are arc-shaped, and an included angle theta between a connecting line of the curvature circle centers of the two notches in any pair of notches and the circle center of the rotor punching sheet meets the following conditions: and 0.3.ltoreq.θ/(360 °/(2×p)).ltoreq.0.7, wherein p is the pole pair number.

According to the rotor punching sheet, through limiting the range of the included angle theta between the connecting line of the curvature circle centers of the two notches in any pair and the circle center of the rotor punching sheet, the cogging torque and the torque pulsation of the motor can be positively influenced under the condition that the sine degree of an air gap magnetic field is improved, and the influence of the unreasonable design of the notches on the torque output quality of the motor is prevented.

According to one embodiment of the application, any one of the pole arc sections is provided with two notches, the two notches are symmetrically arranged along the central axis of the pole arc section, and the two notches are positioned at the joint of the pole arc section and the adjacent transition magnetic bridge or the pole arc section.

According to the rotor punching sheet, through the arrangement of the two notches, the structure can be used for simultaneously considering the optimization effects of cogging torque and torque pulsation under the condition that output torque is not obviously influenced, and the structural rigidity of a pole arc section is prevented from being influenced by excessive notches, so that the durability of the rotor punching sheet is improved.

According to one embodiment of the application, the notch is arc-shaped, and in the case that the notch is arranged at the joint of the pole arc section and the adjacent transition magnetic bridge, the notch is tangential to the peripheral wall of the transition magnetic bridge.

According to the rotor punching sheet provided by the embodiment of the application, through the design of the position relation between the notch and the transition magnetic bridge, the notch at the joint of the pole arc section and the adjacent transition magnetic bridge can be tangent to the peripheral wall of the transition magnetic bridge, so that the improvement effects of cogging torque and torque pulsation are further optimized, meanwhile, the notch and the transition magnetic bridge are enabled to be in natural transition, the notch is convenient to process, and the quality of a finished product is improved.

According to one embodiment of the present application, the notch is in a circular arc shape, and a perpendicular distance L1 between a curvature center of the notch and an outer side of the corresponding installation groove, a thickness H1 of the transition magnetic bridge, and a thickness H2 of the magnetism isolating bridge satisfy: the ratio of (L1-H1)/H2 is more than or equal to 0.5 and less than or equal to 4.

According to the rotor punching sheet disclosed by the application, through the limitation on the range of (L1-H1)/H2, the influence of excessive notch on the minimum thickness of the pole arc section is prevented, the probability of brittle fracture of the pole arc section at the minimum thickness during cyclic use is reduced, the service life of the pole arc section is prolonged, the improvement effect of the influence of excessive notch on the sine degree of an air gap magnetic field is prevented, the processing difficulty of the notch is reduced, and the mass production is facilitated.

According to one embodiment of the application, the centre of curvature of the pole arc segment is spaced from the centre of the rotor sheet.

According to the rotor punching sheet, through the structural design of the eccentric arc cutting of the pole arc section, the shape improvement of the outer arc of the pole arc section is realized, so that the magnetic pole optimization of the permanent magnet is realized, the waveform of the radial air gap magnetic flux density is close to sine, and the cogging torque and torque fluctuation of the motor are reduced to a certain extent.

According to one embodiment of the application, the eccentricity L2 of the pole arc segment and the outer diameter R of the rotor lamination satisfy: L2/(R/p) is more than or equal to 0.5 and less than or equal to 1.6, wherein p is the pole pair number.

According to the rotor punching sheet disclosed by the application, through the limitation on the range of L2/(R/p), the excessive outward protrusion of the polar arc section caused by the overlarge eccentricity L2 of the polar arc section is prevented, so that the space occupied by the polar arc section is reduced as much as possible, the whole volume utilization rate of the motor is improved, the excessive light bending stroke between the polar arc section and the periphery of the punching sheet body caused by the overlarge eccentricity L2 of the polar arc section is prevented, the improvement effect of cogging torque and torque pulsation is further enlarged, and the optimization effect of vibration noise of the motor is further improved.

According to one embodiment of the application, the thickness H1 of the transition magnetic bridge and the thickness H2 of the magnetically isolated bridge satisfy: h1 is more than or equal to 0.8% H2 is less than or equal to 1.2.

According to the rotor punching sheet, the thickness H1 of the transition magnetic bridge and the thickness H2 of the magnetism isolating bridge are more equal due to the limitation of the range of H1/H2, so that the structural strength of the transition magnetic bridge and the magnetism isolating bridge is improved, the uniformity of the whole structure of the rotor punching sheet is improved, the processing difficulty of the rotor punching sheet is reduced, and the cost control of the rotor punching sheet is realized.

In a second aspect, the present application provides a rotor core comprising:

A plurality of rotor sheets as any one of the above, a plurality of the rotor sheets being stacked.

According to the rotor core, through the arrangement of the rotor punching sheet, the sine degree of the air gap magnetic field is effectively improved under the condition that the output torque of the motor is not influenced, so that the torque output quality of the motor is improved, the cogging torque and the torque pulsation of the motor are obviously improved, the vibration noise of the motor is reduced, and the performance of the motor is favorably optimized.

According to one embodiment of the application, the notches are located on different rotor punching sheets and are identical in shape and size in the stacking direction and are arranged opposite to each other.

According to the rotor core, through the shape and the size design of the gaps among the rotor sheets, the gaps which are positioned at the same position in the stacking direction after the rotor sheets are stacked can be almost completely overlapped, and the gaps can be processed on the rotor sheets at the same time during processing, so that the processing efficiency of the rotor sheets is greatly improved, the production efficiency of the rotor core is remarkably improved, and the rotor core is beneficial to popularization and use.

In a third aspect, the present application provides a rotor comprising: such as any of the above.

According to the rotor, through the arrangement of the rotor core, more stable torque output is pursued, meanwhile, the torque output quality of the motor can be considered, and the cogging torque and the torque pulsation of the motor are reduced, so that the vibration noise of the motor during operation is reduced, and the application requirements of higher standards are further met.

In a fourth aspect, the present application provides an electric machine comprising: such as the rotor described above.

According to the motor disclosed by the application, through the arrangement of the rotor, the sine degree of the air-gap magnetic field is effectively improved under the condition that the output torque of the motor is not influenced, so that the cogging torque and the torque pulsation of the motor are obviously improved, the performance of the motor in the aspects of noise, vibration, acoustic vibration roughness and the like are favorably optimized, and the use feeling and the experience feeling of a user are improved.

Additional aspects and advantages of the application 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 application.

Drawings

The foregoing and/or additional aspects and advantages of the application 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 is a schematic diagram of a rotor sheet according to an embodiment of the present application;

FIG. 2 is a second schematic diagram of a rotor sheet according to an embodiment of the present application;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic view of a portion of a rotor sheet according to an embodiment of the present application;

FIG. 5 is a second schematic view of a portion of a rotor sheet according to an embodiment of the present application;

FIG. 6 is a graph comparing the effects of the present application with those of the conventional scheme;

FIG. 7 is a second comparison of the effects of the present application and conventional schemes.

Reference numerals:

Rotor lamination 100, lamination body 110, mounting groove 111, polar arc section 120, transition magnetic bridge 130, magnetism isolating bridge 140, breach 150, quadrature axis section 160.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

The application discloses a rotor punching sheet 100.

A rotor sheet 100 according to an embodiment of the present application is described below with reference to fig. 1-5.

In some embodiments, as shown in fig. 1-2 and 4-5, rotor sheet 100 includes: a die body 110.

The periphery of the punching body 110 is provided with a plurality of pole arc sections 120 which are arranged at intervals along the circumferential direction, the inner side of each pole arc section 120 is provided with a mounting groove 111 for mounting a permanent magnet, two adjacent pole arc sections 120 are connected through an intersecting shaft section 160 and a magnetic isolation bridge 140, the magnetic isolation bridge 140 is connected to two ends of the intersecting shaft section 160, and the pole arc sections 120 are connected with the magnetic isolation bridge 140 through a transition magnetic bridge 130 positioned outside the mounting groove 111. The pole arc segment 120 is provided with a notch 150 in a region from the connection with the adjacent transition magnetic bridge 130 to the middle of the pole arc segment 120, and the notch 150 is located on the peripheral wall of the punching body 110.

The plurality of mounting slots 111 are disposed in one-to-one correspondence with the plurality of pole segments 120, wherein the plurality represents 2 or more, for example, in some embodiments, as shown in fig. 1-2 and 4-5, the outer circumference of the punch body 110 is provided with 8 pole segments 120 arranged at intervals along the circumferential direction.

The shape of the notch 150 may include, but is not limited to, circular arc, square, cone, etc., such as, in some embodiments, circular arc, as shown in fig. 1-5.

In this embodiment, as shown in fig. 1, the notches 150 may be disposed at the connection between the pole segment 120 and the transition bridge 130.

In other embodiments, as shown in fig. 2 and 5, the notch 150 may be disposed on the pole segment 120.

In still other embodiments, as shown in fig. 4, at least a portion of the gap 150 may be disposed at the junction of the pole segment 120 and the transition bridge 130, and the remaining portion of the gap 150 may be disposed on the pole segment 120.

In practical implementation, as shown in fig. 1-5, two adjacent pole arc segments 120 may be connected by two transition magnetic bridges 130, two magnetism isolating bridges 140 and a quadrature axis segment 160, where the magnetism isolating bridges 140 may be a part of the outer circumference of the lamination body 110, in other words, the curvature center of the magnetism isolating bridges 140 coincides with the center of the whole rotor lamination 100, the outer surface of the transition magnetic bridges 130 may be a plane, the outer surface of the pole arc segments 120 may be an arc surface, the inner surface of the pole arc segments 120 may be a plane, the notch 150 may be open towards the outer side of the lamination body 110, the notch 150 may be disposed at the junction between the pole arc segments 120 and the transition magnetic bridges 130, or the notch 150 may be disposed on the pole arc segments 120, and under the condition that the motor is energized, the rotating magnetic field generated by energizing the stator of the motor may drive the permanent magnet in the mounting groove 111 to rotate, thereby generating electromagnetic torque to drive the rotor lamination 100 to rotate around the quadrature axis.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the arrangement of the polar arc section 120, the transition magnetic bridge 130, the magnetism isolating bridge 140 and the notch 150, the sine degree of an air gap magnetic field is effectively improved on the premise that the output torque is not obviously reduced, so that the cogging torque and the torque pulsation of a motor are obviously improved, the vibration noise of the motor is further reduced, and the working performance of the motor is favorably optimized.

In some embodiments, as shown in fig. 1-2 and 4-5, the region of the pole segment 120 from the junction with the adjacent transition bridge 130 to the middle of the pole segment 120 may be provided with at least one pair of notches 150, and two notches 150 of any pair of notches 150 may be symmetrically disposed along the central axis of the pole segment 120.

In this embodiment, as shown in fig. 1-2, the pole segment 120 is provided with a pair of notches 150 in a region from a connection with an adjacent transition magnetic bridge 130 to a middle portion of the pole segment 120, and two notches 150 of the pair of notches 150 are symmetrically disposed along a central axis of the pole segment 120.

In other embodiments, as shown in fig. 4, the pole arc segment 120 is provided with at least two pairs of notches 150 in a region from a connection portion with the adjacent transition magnetic bridge 130 to a middle portion of the pole arc segment 120, and the two pairs of notches 150 are arranged separately, wherein two notches 150 in each pair of notches 150 are symmetrically arranged along a central axis of the pole arc segment 120, specifically, two notches 150 in one pair of notches 150 are arranged at a connection portion between the pole arc segment 120 and the transition magnetic bridge 130, and two notches 150 in the other pair of notches 150 are arranged in the pole arc segment 120.

In still other embodiments, as shown in fig. 5, the pole arc segment 120 is provided with at least three pairs of notches 150 in a region from a connection with the adjacent transition magnetic bridge 130 to a middle portion of the pole arc segment 120, and the three pairs of notches 150 are arranged separately, wherein two notches 150 in each pair of notches 150 are symmetrically arranged along a central axis of the pole arc segment 120, and specifically, the two pairs of notches 150 are arranged in the pole arc segment 120.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the arrangement of the at least one pair of notches 150, the structural design that the two notches 150 in each pair of notches 150 are symmetrically arranged along the central axis of the pole arc section 120 is matched, so that the sine degree of an air gap magnetic field is further improved, the cogging torque and the torque pulsation at each position are more uniform, the performance of the whole motor is optimized as much as possible, and the position design schemes of different notches 150 can be selected according to actual requirements, so that the flexibility and the diversity of the rotor punching sheet 100 in structure are improved.

In some embodiments, as shown in fig. 1-2 and 4-5, the shape and size of both notches 150 in any pair of notches 150 may be the same.

In this embodiment, the notches 150 may be circular arc-shaped, and the region from the connection portion of the pole arc section 120 with the adjacent transition magnetic bridge 130 to the middle of the pole arc section 120 may be provided with at least one pair of notches 150, specifically, the radii of the curvature circles of the two notches 150 in any pair of notches 150 may be equal, and the corresponding radians of the two notches 150 in any pair of notches 150 may be equal, and the positions and the shapes of the two notches 150 in any pair of notches 150 may be symmetrically arranged along the central axis of the pole arc section 120.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the shape and the size design of the two notches 150 in each pair of notches 150, the positions and the shapes of the two notches 150 in any pair of notches 150 corresponding to the polar arc section 120 can be symmetrical, so that the uniformity of the sine degree of each part of the air gap magnetic field is improved, and the optimization effect of cogging torque and torque pulsation is improved.

In some embodiments, as shown in fig. 1, the notches 150 may be circular arc, and the included angle θ between the center of curvature of two notches 150 in any pair of notches 150 and the line connecting the center of the rotor sheet 100 may satisfy: and 0.3.ltoreq.θ/(360 °/(2×p)).ltoreq.0.7, wherein p is the pole pair number.

Specifically, the included angle θ between the center of curvature of the two notches 150 of any pair of notches 150 and the line connecting the center of curvature of the rotor sheet 100 may be 0.3, 0.425, 0.5, 0.65, 0.7, or other values between 0.3 and 0.7, without limitation.

It should be noted that, in the case that the gap 150 is provided at the connection between the polar arc segment 120 and the transition magnetic bridge 130, the included angle θ between the connecting line of the curvature center of the two gaps 150 in any pair of gaps 150 and the center of the rotor sheet 100 may satisfy: and 0.4 < theta/(360 DEG/(2 x p)) < 0.7, wherein p is an polar logarithm.

Specifically, in the case where the gap 150 is provided at the connection between the pole arc segment 120 and the transition magnetic bridge 130, the angle θ between the center of curvature of the two gaps 150 in any pair of gaps 150 and the line connecting the center of curvature of the rotor sheet 100 may be 0.4, 0.475, 0.55, 0.6, 0.7, or other values between 0.4 and 0.7, which is not limited herein.

According to the rotor punching sheet 100 provided by the embodiment of the application, through limiting the range of the included angle theta between the connecting line of the curvature circle centers of the two notches 150 in any pair of notches 150 and the circle center of the rotor punching sheet 100, the cogging torque and the torque pulsation of the motor can be positively influenced under the condition of improving the sine degree of the air gap magnetic field, and the influence of the unreasonable design of the notches 150 on the torque output quality of the motor is prevented.

In some embodiments, as shown in fig. 1-2, two notches 150 may be provided in any pole segment 120, the two notches 150 may be symmetrically disposed along a central axis of the pole segment 120, and the two notches 150 may be located at a junction of the pole segment 120 and an adjacent transition bridge 130 or the pole segment 120.

In this embodiment, as shown in fig. 1, two notches 150 are disposed on any pole arc segment 120, the two notches 150 are symmetrically disposed along the central axis of the pole arc segment 120, and the two notches 150 are located at the connection between the pole arc segment 120 and the adjacent transition magnetic bridge 130, in other words, the two notches 150 are located at two ends of the pole arc segment 120.

In other embodiments, as shown in fig. 2, two notches 150 are provided on any pole segment 120, the two notches 150 are symmetrically disposed along the central axis of the pole segment 120, and the two notches 150 are located in the middle of the pole segment 120.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the arrangement of the two notches 150, the optimized effects of cogging torque and torque pulsation can be simultaneously considered under the condition that the output torque is not obviously influenced, and the structural rigidity of the pole arc section 120 is prevented from being influenced by the excessive notches 150, so that the durability of the rotor punching sheet 100 is improved.

In some embodiments, as shown in fig. 1 and 4, the notch 150 may be circular arc shaped, where the notch 150 is provided at the junction of the pole segment 120 and the adjacent transition bridge 130, the notch 150 may be tangential to the outer peripheral wall of the transition bridge 130.

In this embodiment, as shown in fig. 1 and 4, the magnetism isolating bridge 140 may be a part of the outer circumference of the lamination body 110, in other words, the curvature center of the magnetism isolating bridge 140 coincides with the center of the entire rotor lamination 100, the outer surface of the transition magnetic bridge 130 may be a plane, the notch 150 may be a circular arc shape, and in the case where the notch 150 is provided at the junction of the polar arc section 120 and the adjacent transition magnetic bridge 130, the tangent plane of the notch 150 at the junction with the transition magnetic bridge 130 may coincide with the outer surface of the transition magnetic bridge 130, so that the notch 150 may be tangent to the outer circumferential wall of the transition magnetic bridge 130 at this time.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the design of the position relation between the notch 150 and the transition magnetic bridge 130, the notch 150 at the joint of the pole arc section 120 and the adjacent transition magnetic bridge 130 can be tangent to the peripheral wall of the transition magnetic bridge 130, so that the improvement effects of cogging torque and torque pulsation are further optimized, and meanwhile, the notch 150 and the transition magnetic bridge 130 are enabled to be in natural transition, the notch 150 is convenient to process, and the quality of a finished product is improved.

In some embodiments, as shown in fig. 3, the notch 150 may be in a circular arc shape, where a perpendicular distance L1 between a curvature center of the notch 150 and an outer side of the corresponding mounting groove 111, a thickness H1 of the transition magnetic bridge 130, and a thickness H2 of the magnetism isolating bridge 140 may satisfy: the ratio of (L1-H1)/H2 is more than or equal to 0.5 and less than or equal to 4.

Specifically, (L1-H1)/H2 may be 0.5, 1, 2.25, 3.375, 4 or other values between 0.5 and 4, without limitation.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the limitation of the range of (L1-H1)/H2, the gap 150 is prevented from being excessively large to influence the minimum thickness of the pole arc section 120, the probability of brittle fracture of the pole arc section 120 at the minimum thickness during the cyclic use is reduced, the service life of the pole arc section 120 is prolonged, the improvement effect of the gap 150 on the sine degree of an air gap magnetic field is prevented from being excessively small, the processing difficulty of the gap 150 is reduced, and mass production is facilitated.

In some embodiments, as shown in fig. 1-2 and 4-5, the center of curvature of the pole arc segment 120 may be spaced from the center of the rotor sheet 100.

In practical implementation, as shown in fig. 1-2 and fig. 4-5, the polar arc segment 120 may be processed in an eccentric arc cutting manner, specifically, the center of curvature of the polar arc segment 120 may be located above the center of the rotor sheet 100, so that the outer surface of the polar arc segment 120 protrudes outwards relative to the outer circumference of the rotor sheet 100, and the radian corresponding to the polar arc segment 120 is greater than the included angle between the two ends of the polar arc segment 120 and the line connecting the center of the rotor sheet 100.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the structural design of the eccentric arc cutting of the polar arc section 120, the shape improvement of the outer arc of the polar arc section 120 is realized, so that the magnetic pole optimization of the permanent magnet is realized, the magnetic flux density waveform of the radial air gap is close to sine, and the cogging torque and torque fluctuation of the motor are reduced to a certain extent.

In some embodiments, as shown in fig. 1, the eccentricity L2 of the pole segment 120 and the outer diameter R of the rotor plate 100 may satisfy: L2/(R/p) is more than or equal to 0.5 and less than or equal to 1.6, wherein p is the pole pair number.

Specifically, L2/(R/p) may be 0.5, 0.875, 1.25, 1.5, 1.6 or other values between 0.5 and 1.6, without limitation.

According to the rotor punching sheet 100 provided by the embodiment of the application, through the limitation of the range L2/(R/p), the excessive outward protrusion of the pole arc section 120 caused by the overlarge eccentricity L2 of the pole arc section 120 is prevented, so that the space occupied by the pole arc section 120 is reduced as much as possible, the whole volume utilization rate of the motor is improved, the excessive light bending stroke between the pole arc section 120 and the periphery of the punching sheet body 110 caused by the overlarge eccentricity L2 of the pole arc section 120 is prevented, the improvement effect of cogging torque and torque pulsation is further enlarged, and the optimization effect of vibration noise of the motor is further improved.

In some embodiments, as shown in FIG. 3, the thickness H1 of the transition bridge 130 and the thickness H2 of the magnetically isolated bridge 140 may satisfy: h1 is more than or equal to 0.8% H2 is less than or equal to 1.2.

Specifically, H1/H2 may be 0.8, 0.95, 1, 1.125, 1.2, or other values between 0.8 and 1.2, without limitation.

Preferably, in some embodiments, H1/H2 is 1.

According to the rotor punching sheet 100 provided by the embodiment of the application, the thickness H1 of the transition magnetic bridge 130 and the thickness H2 of the magnetism isolating bridge 140 are more nearly equal due to the limitation of the range of H1/H2, so that the structural strength of the transition magnetic bridge 130 and the magnetism isolating bridge 140 is improved, and meanwhile, the uniformity of the whole structure of the rotor punching sheet 100 is improved, thereby reducing the processing difficulty of the rotor punching sheet 100 and realizing the cost control of the rotor punching sheet 100.

The application also discloses a rotor core.

In some embodiments, the rotor core includes: a plurality of rotor blades 100 as any one of the above.

A plurality of rotor sheets 100 are stacked.

In this embodiment, the rotor core may be formed by laminating a plurality of rotor sheets 100, the mounting grooves 111 of the plurality of rotor sheets 100 may be aligned, the rotor sheets 100 may define a shaft mounting hole for inserting a shaft, the shaft mounting holes of the plurality of rotor sheets 100 may be aligned, the rotor windings may be disposed on the outer circumference of the rotor core, and the adjacent rotor sheets 100 may be insulated from each other.

According to the rotor core provided by the embodiment of the application, through the arrangement of the rotor punching sheet 100, the sine degree of the air gap magnetic field is effectively improved under the condition that the output torque of the motor is not influenced, so that the torque output quality of the motor is improved, the cogging torque and the torque pulsation of the motor are obviously improved, the vibration noise of the motor is reduced, and the performance of the motor is favorably optimized.

In some embodiments, the notches 150 located on different rotor sheets 100 and disposed directly opposite in the stacking direction may be the same shape and size.

In this embodiment, the shapes and sizes of the plurality of notches 150 located at the same position in the stacking direction on the plurality of rotor sheets 100 may be the same, so that the plurality of notches 150 located at the same position in the stacking direction after the plurality of rotor sheets 100 are stacked may be almost completely overlapped, and further, the shapes and sizes of all the notches 150 on each rotor sheet 100 may be the same.

According to the rotor core provided by the embodiment of the application, through the shape and the size design of the notches 150 among the rotor punching sheets 100, the notches 150 which are positioned at the same position in the stacking direction after the rotor punching sheets 100 are stacked can be almost completely overlapped, and the notches 150 can be simultaneously processed on the rotor punching sheets 100 during processing, so that the processing efficiency of the rotor punching sheets 100 is greatly improved, the production efficiency of the rotor core is remarkably improved, and the popularization and the use are facilitated.

The application also discloses a rotor.

In some embodiments, the rotor comprises: such as the rotor core described above.

The permanent magnet may be built in the mounting groove 111 of the rotor core, and the rotating shaft may penetrate through the rotating shaft mounting hole of the rotor core.

According to the rotor provided by the embodiment of the application, through the arrangement of the rotor core, more stable torque output is pursued, meanwhile, the torque output quality of the motor can be considered, and the cogging torque and the torque pulsation of the motor are reduced, so that the vibration noise of the motor during working is reduced, and the application requirements of higher standards are further matched.

The application also discloses a motor.

In some embodiments, the motor comprises: such as the rotor described above.

According to the motor provided by the embodiment of the application, through the arrangement of the rotor, the sine degree of the air gap magnetic field is effectively improved under the condition that the output torque of the motor is not influenced, so that the cogging torque and the torque pulsation of the motor are obviously improved, the performance of the motor in the aspects of noise, vibration, acoustic vibration roughness and the like are favorably optimized, and the use feeling and the experience feeling of a user are improved.

In summary, based on the rotor sheet 100 described above, a comparative experiment is provided below to demonstrate the significant effects of embodiments of the present application.

As shown in fig. 6 to 7, the effect of the solution of the present application in terms of cogging torque is compared with that of the conventional solution in fig. 6, the abscissa in fig. 6 is the rotor position, the ordinate in fig. 6 is the cogging torque, fig. 7 is the effect of the solution of the present application in terms of output torque is compared with that of the conventional solution in terms of output torque, the abscissa in fig. 6 is the rotor position, and the ordinate in fig. 6 is the output torque, and as can be seen from the graph, the absolute values of the cogging torque of the motor at different rotor positions in the solution of the present application are smaller than the absolute values of the cogging torque of the motor at different rotor positions in the conventional solution, the uniformity of the cogging torque of the motor at different rotor positions in the solution of the present application is also far better than that of the motor at different rotor positions in the conventional solution.

It can be seen from this comparison experiment that the inventive solution significantly improves the cogging torque and torque ripple of the motor while stabilizing the output torque of the motor to a certain extent.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the description of the application, a "first feature" or "second feature" may include one or more of such features.

In the description of the present application, "plurality" means two or more.

In the description of the application, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the application, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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 application. In this specification, 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.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (14)

1. A rotor punching sheet, comprising:

The punching sheet comprises a punching sheet body, wherein a plurality of pole arc sections are arranged at intervals along the circumferential direction on the periphery of the punching sheet body, a mounting groove for mounting a permanent magnet is formed in the inner side of each pole arc section, two adjacent pole arc sections are connected through an intersecting shaft section and a magnetic isolation bridge, the magnetic isolation bridge is connected to two ends of the intersecting shaft section, the pole arc sections are connected with the magnetic isolation bridge through transition magnetic bridges located on the outer side of the mounting groove, gaps are formed in the connecting positions of the pole arc sections and the adjacent transition magnetic bridges to the region of the middle of the pole arc sections, and the gaps are located in the peripheral wall of the punching sheet body.

2. The rotor punching of claim 1, wherein the pole arc segment is provided with at least one pair of notches in a region from a junction with an adjacent transition magnetic bridge to a middle portion of the pole arc segment, and two notches in any pair of notches are symmetrically arranged along a central axis of the pole arc segment.

3. The rotor punching of claim 2, wherein two of said notches in any pair of notches are the same shape and size.

4. The rotor punching sheet according to claim 2, wherein the notches are circular arc-shaped, and an included angle θ between a line connecting a curvature center of two notches of any pair of notches and a center of the rotor punching sheet satisfies: and 0.3.ltoreq.θ/(360 °/(2×p)).ltoreq.0.7, wherein p is the pole pair number.

5. The rotor punching of claim 1, wherein any one of the pole segments is provided with two notches, the two notches are symmetrically arranged along a central axis of the pole segment, and the two notches are positioned at a junction of the pole segment and an adjacent transition magnetic bridge or the pole segment.

6. The rotor punching of claim 1, wherein the notch is circular arc-shaped, and is tangential to an outer peripheral wall of the transition magnetic bridge in a case where the notch is provided at a junction of the pole arc segment and an adjacent transition magnetic bridge.

7. The rotor punching sheet according to claim 1, wherein the notch is circular arc-shaped, and a vertical distance L1 between a curvature center of the notch and an outer side of the corresponding mounting groove, a thickness H1 of the transition magnetic bridge, and a thickness H2 of the magnetism isolating bridge satisfy: the ratio of (L1-H1)/H2 is more than or equal to 0.5 and less than or equal to 4.

8. The rotor sheet of any one of claims 1-7, wherein a center of curvature of the pole arc segment is spaced apart from a center of the rotor sheet.

9. The rotor chip of claim 8, wherein the eccentricity L2 of the pole arc segments and the outer diameter R of the rotor chip satisfy: L2/(R/p) is more than or equal to 0.5 and less than or equal to 1.6, wherein p is the pole pair number.

10. The rotor punching sheet according to any of claims 1-7, characterized in that a thickness H1 of the transition magnetic bridge and a thickness H2 of the magnetism isolating bridge satisfy: h1 is more than or equal to 0.8% H2 is less than or equal to 1.2.

11. A rotor core, comprising:

A plurality of rotor laminations according to any one of claims 1-10, a plurality of said rotor laminations being stacked.

12. The rotor core as recited in claim 11, wherein the notches located on different ones of the rotor laminations and disposed directly opposite each other in the stacking direction are identical in shape and size.

13. A rotor, comprising: the rotor core according to claim 11 or 12.

14. An electric machine, comprising: a rotor as claimed in claim 13.