CN218920086U

CN218920086U - Rotor punching sheet, rotor iron core, motor and industrial equipment

Info

Publication number: CN218920086U
Application number: CN202223184170.9U
Authority: CN
Inventors: 吴越虹; 甘磊; 徐飞; 杨星星; 叶晶
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-04-25
Anticipated expiration: 2032-11-30

Abstract

The utility model provides a rotor punching sheet, a rotor iron core, a motor and industrial equipment. The rotor punching sheet comprises a body and a concave part or comprises a body and a straight line part, and the concave part or the straight line part is arranged at the edge of the body.

Description

Rotor punching sheet, rotor iron core, motor and industrial equipment

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor punching sheet, a rotor iron core, a motor and industrial equipment.

Background

At present, in the related art, the servo motor has the advantages of high efficiency, high torque density, strong overload capacity and the like, can be suitable for the requirements of various automatic equipment, and is widely applied in the field of industrial automation. However, when the motor is not energized, the control accuracy of the motor is lowered due to cogging torque generated by interaction between the permanent magnets and the stator core.

Disclosure of Invention

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

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

A second aspect of the present utility model proposes a rotor core.

A third aspect of the present utility model proposes an electric machine.

A fourth aspect of the utility model provides an industrial plant.

In view of this, a first aspect of the present utility model provides a rotor sheet comprising a body and a recess, or comprising a body and a straight portion, the recess or the straight portion being provided at an edge of the body.

The rotor punching sheet provided by the utility model comprises a body, wherein the concave part or the linear part is arranged at the edge of the body, so that the edge of the rotor punching sheet is topological and repaired, the peak value of cogging torque generated by interaction between the permanent magnet and the stator core is further reduced, and the control precision of the motor is improved.

Specifically, by providing the concave portion or the linear portion at the outer ring edge of the body, the peak value of the cogging torque of the motor can be reduced by the concave portion or the linear portion, so that the torque ripple of the motor can be reduced. Because the torque fluctuation of the motor is reduced, the motor is easier to control, the control precision of the motor is improved, and the quality of the motor is further improved. When the motor is applied to industrial equipment, the control accuracy of the motor is improved, so that the control progress of the industrial equipment is improved, the control design of the industrial equipment is facilitated, and the quality of the industrial equipment is improved.

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

in one aspect of the present utility model, the rotor sheet further includes a protrusion connected to the body, protruding from an edge of the body in a radial direction of the body, and the concave portion or the linear portion is disposed at a side of the protrusion away from the body in the radial direction.

In this technical scheme, the body itself can be circular, also can change the shape according to bellied shape needs for the body can with protruding looks adaptation. The bulge is connected with the body and is positioned on the edge of the body. The protrusion protrudes away from the center of the body relative to the outer ring edge of the body, and the concave part or the straight line part is positioned on the edge of one side of the protrusion away from the body. The protrusion is matched with the concave part or the linear part to realize the topology of the outer ring of the rotor punching sheet, so that the peak value of the cogging torque generated by the interaction between the permanent magnet and the stator core is further reduced, and the control precision of the motor is improved.

In one aspect of the present utility model, the recess is provided on the protrusion, and the protrusion is recessed from a side away from the body toward the center of the body.

In this aspect, the recess is provided on the protrusion, the recess is located at an edge of a side of the protrusion away from the body, and is recessed from the edge of the side of the protrusion away from the body toward the center of the body, and an opening of the recess is directed toward the stator core. By arranging the concave part on the bulge, the peak value of cogging torque generated by interaction between the permanent magnet and the stator core is reduced, and the precision of the motor is improved.

Further, the concave portion may be a semicircular groove, a rectangular groove, a triangular groove, a polygonal groove, or an irregularly shaped groove.

In one aspect of the present utility model, the linear portion is disposed on the protrusion, and extends linearly along a side of the protrusion away from the body.

In this technical solution, the linear portion is disposed on the protrusion, and the linear portion is located at an edge of a side of the protrusion away from the body, and extends linearly along a tangential direction of a position where a central line of the recess or the linear portion in a radial direction is located, that is, an edge of a side of the linear portion away from the body extends linearly. By arranging the straight line part on the bulge, the peak value of cogging torque generated by interaction between the permanent magnet and the stator core is reduced, and the precision of the motor is improved.

In one technical scheme of the utility model, the bulge comprises a first arc part and a second arc part; the first arc part is positioned at a first side of the concave part or the straight line part in the circumferential direction; the second circular arc portion is located at a second side of the concave portion or the straight portion in the circumferential direction.

In the technical scheme, the two sides of the concave part or the straight line part are respectively provided with the first arc part and the second arc part, and the first arc part, the second arc part and the concave part or the straight line part are matched, so that the outer circle of the rotor punching sheet is further topological, the peak value of cogging torque generated by interaction between the permanent magnet and the stator iron core is further reduced, and the precision of the motor is improved.

Specifically, the edges of the first arc part and the second arc part, which are far away from the side of the body, are arc-shaped, and the circle centers of the edges of the first arc part and the second arc part, which are far away from the side of the body, are coincident.

Further, the edges of one sides of the first arc part and the second arc part far away from the body are not overlapped with the circle center of the circle where the outer ring of the body is positioned.

In one embodiment of the present utility model, the first and second arcuate portions are symmetrical with respect to the concave portion or the straight portion.

In the technical scheme, the first arc part and the second arc part are symmetrical relative to the concave part or the straight line part, so that the rotor core formed by the rotor punching sheet is stressed more uniformly in a magnetic field generated by the stator assembly, vibration generated by the rotor core in the rotation process is reduced, and the control precision of the motor is further improved.

Specifically, the concave portion or the straight portion has a symmetry line in the radial direction, the concave portion or the straight portion is symmetrical with respect to the symmetry line, and the first circular arc portion and the second circular arc portion are symmetrical with respect to the symmetry line.

In one aspect of the present utility model, the number of the protrusions is plural, and the plural protrusions are arranged along the circumferential direction of the body.

In the technical scheme, the number of the protrusions is multiple, the protrusions are arranged along the circumferential direction of the body, so that the excircle of the rotor punching sheet is further topological, the peak value of cogging torque generated by interaction between the permanent magnet and the stator core is further reduced, and the precision of the motor is improved. The protrusions are arranged along the circumferential direction of the body, so that the uniformity of stress of the rotor core formed by the rotor punching sheet in a magnetic field generated by the stator assembly is further improved, vibration generated by the rotor core in the rotating process is reduced, and the control precision of the motor is further improved.

In one aspect of the present utility model, the rotor sheet further includes a plurality of rotor grooves arranged along a circumferential direction of the body; wherein the number of the plurality of rotor grooves is the same as the number of the plurality of protrusions.

In this technical scheme, the rotor punching still includes a plurality of rotor grooves, and a plurality of rotor grooves are arranged along the circumference of body, and a plurality of rotor grooves can realize the installation and the fixed of permanent magnet, and then make the rotor core that comprises this rotor punching can rotate under stator module's drive. The number of the rotor grooves is the same as the number of the protrusions, so that the number of the protrusions corresponds to the number of the rotor grooves, torque fluctuation of the motor is further reduced, and control accuracy of the motor is improved.

In one aspect of the present utility model, each rotor slot of the plurality of rotor slots extends in a radial direction, and the rotor sheet further includes a first magnetic shielding bridge disposed on a side of the rotor slot away from the center of the body and between adjacent protrusions of the plurality of protrusions.

In this technical scheme, the rotor punching still includes first magnetism isolating bridge, and first magnetism isolating bridge sets up in the one side that the body center was kept away from to the rotor groove, is arranged in between the adjacent arch in a plurality of archs, and then reduces the magnetic leakage of rotor groove, promotes the torque of motor, further promotes the performance of motor.

In one aspect of the present utility model, the rotor sheet further includes a second magnetic barrier bridge disposed between adjacent rotor slots of the plurality of rotor slots.

In this technical scheme, set up the second magnetism isolating bridge between two adjacent rotor grooves, further reduce the magnetic leakage in rotor groove, promote the moment of torsion of motor, further promote the performance of motor.

Further, a magnetism isolating groove is further formed in the rotor punching sheet, the magnetism isolating groove is formed in one side, close to the center of the body, of the rotor groove, and the magnetism isolating groove is communicated with the rotor groove.

The number of the magnetism isolating grooves can be one, and the number of the magnetism isolating grooves can be two.

Under the condition that the number of the magnetism isolating grooves is two, the two magnetism isolating grooves are arranged on two sides of the rotor groove in the circumferential direction.

The rotor groove can be filled with air, i.e. the magnetism isolating groove is not filled with any magnetism isolating material.

The rotor groove can be filled with magnetism isolating materials, and magnetism isolating materials and air can be filled to further reduce magnetism leakage, so that the performance of the motor is improved.

And a positioning part protruding into the rotor groove is arranged on one side of the rotor groove, which is close to the center of the body, and when the permanent magnet is installed in the rotor groove, the positioning part is propped against the permanent magnet, so that the positioning of the permanent magnet is realized, and the accuracy of the position of the permanent magnet is improved.

A second aspect of the present utility model provides a rotor core comprising a plurality of rotor laminations according to any one of the above-described aspects, the plurality of rotor laminations being arranged in an axial direction.

Since the rotor core includes a plurality of rotor sheets according to any one of the above-described aspects, the rotor core has all the advantageous effects of the rotor sheet according to any one of the above-described aspects.

Further, the rotor punching sheet is formed by punching or cutting a silicon steel sheet.

And each formed rotor punching sheet is provided with a riveting point, and the axially adjacent rotor punching sheets are connected through the riveting points.

The plurality of rotor sheets arranged in the axial direction may also be fixed by glue, such as insulating glue.

The plurality of rotor punching sheets arranged along the axial direction can also be fixed by welding.

Further, permanent magnets are arranged on the rotor core, the permanent magnets are magnetic steel, the number of the permanent magnets is multiple, and each permanent magnet is radially arranged and is matched with the rotor groove.

The plurality of permanent magnets are inserted into the rotor core in a spoke type, the magnetizing directions of the plurality of permanent magnets are circumferential, and the magnetizing directions of two adjacent magnetic steels in the plurality of permanent magnets are opposite.

The third aspect of the utility model provides a motor, comprising a stator core and a rotor core according to any of the above technical solutions, wherein the stator core is adapted to the rotor core.

Since the motor includes the rotor core according to any one of the above-described aspects, the motor has all the advantageous effects of the rotor core according to any one of the above-described aspects.

In one aspect of the present utility model, the stator core includes a yoke portion and a plurality of teeth portions connected to the yoke portion, the plurality of teeth portions being arranged in a circumferential direction of the yoke portion, and a stator groove being provided between two adjacent teeth portions of the plurality of teeth portions.

In this technical scheme, the stator core includes yoke portion and a plurality of tooth portion, and a plurality of tooth portions are connected with the yoke portion, and along the circumference of yoke portion distribution, are formed with the stator groove between adjacent tooth portion in a plurality of tooth portions, and then form the stator core.

Further, the yoke portion is annular, the plurality of tooth portions are distributed along the inner ring of the yoke portion, and the rotor core can be embedded in the stator core, so that the inner rotor motor is formed.

Further, the stator core includes a plurality of core blocks, and every core block in a plurality of core blocks all includes yoke and tooth, and yoke is the arcuation, and tooth and yoke are connected, and a plurality of core blocks are arranged along circumference, and adjacent two core blocks are connected, and then form the stator core.

The core block may have a T-shape, and the stator core may be formed of a T-shaped stator core, insulating frames covering the outside of the stator core, and windings wound on each of the insulating frames.

The insulating frame is formed by 3D printing or die forming of a high polymer composite material, and a large notch part is filled near the notch of the stator core so as to prevent winding wires from sliding out.

The iron core block is formed by stamping or cutting a silicon steel sheet, and each formed stator punching sheet is connected by rivet points, glue or welding.

In one embodiment of the present utility model, a ratio of a width of the notch of the stator groove in the circumferential direction to a width of the recess in the circumferential direction is 0.3 or more and 1 or less. The ratio of the width of the notch of the stator slot in the circumferential direction to the width of the straight line part in the circumferential direction is more than or equal to 0.3 and less than or equal to 1.

In the technical scheme, the width of the notch of the stator slot in the circumferential direction is a first width, the width of the concave part or the linear part in the circumferential direction is a second width, and the ratio of the first fast reading to the second width is 0.3 to 1, so that the width of the stator slot is matched with the width of the concave part or the linear part, the peak value of cogging torque is reduced, and the control precision of the motor is improved.

In one technical scheme of the utility model, the motor further comprises a plurality of groups of coils, and the plurality of groups of coils are respectively wound on the plurality of tooth parts; the ratio of the turns of two adjacent coils in the plurality of groups of coils is more than or equal to 1.5 and less than or equal to 2.

In the technical scheme, the plurality of groups of coils are respectively wound on the plurality of teeth to fix the plurality of groups of coils, so that the plurality of groups of coils can be used as windings to generate electromagnetic fields, and further, the driving of the rotor is realized. The ratio of the turns of two adjacent groups of coils in the plurality of groups of coils is 1.5 to 2, the winding coefficient is adjusted by adjusting the ratio of the turns of two adjacent groups of coils in the plurality of groups of coils, and the ratio of the turns of two adjacent groups of coils in the plurality of groups of coils is set between 1.5 and 2, so that the winding coefficient of the motor can be improved, and the overload capacity of the motor is further improved.

Further, the outside of the stator core is covered with an insulating frame, and the coil is wound on the insulating frame.

Further, the ratio of the number of turns of two adjacent sets of coils among the sets of coils may also be 1.

In one technical scheme of the utility model, the stator core further comprises a tooth shoe, and the tooth shoe is connected with one end of the tooth part far away from the yoke part; wherein, the ratio of the width of the notch of the stator slot in the circumferential direction to the width of the tooth shoe in the circumferential direction is more than or equal to 0.1 and less than or equal to 0.4.

In the technical scheme, the ratio of the width of the notch of the stator slot in the circumferential direction to the width of the tooth shoe in the circumferential direction is set to be 0.1 to 0.4, so that the width of the notch of the stator slot in the circumferential direction is increased, and no-load counter potential and overload torque of the motor are further improved.

Specifically, by setting the ratio of the width of the slot opening of the stator slot in the circumferential direction to the width of the tooth shoe to 0.1 to 0.4 so that the width of the slot opening in the circumferential direction is increased, the motor having the stator core in which the slot opening width is increased can increase the working subharmonic content of the motor flux density as compared with the motor having the stator core in which the slot opening of the stator slot is not increased, and can realize a higher back electromotive force in a state of low fundamental flux density, high harmonic flux density by the magnetic field modulation effect of the fractional slot concentrated winding itself; the notch is increased, so that the tooth magnetic density saturation under high overload is relieved, the linearity of the motor is improved, and higher overload torque is realized; in this case, the overload capacity of the motor with the enlarged stator slot is 7% higher than that of the motor without the enlarged stator slot, compared with the two motors.

And through setting up arch and concave part on the rotor punching, through setting up arch and straight line portion on the rotor punching, protruding and concave part matched with, or protruding and straight line portion are to the cooperation, can all realize the trailing the mending to the rotor outer lane, when promoting motor overload capacity through the width of the notch of increase stator groove, reduce the peak value of motor cogging torque, avoid leading to the cogging torque to worsen because of the notch increase in stator groove.

The ratio of the width of the slot opening of the stator slot in the circumferential direction to the width of the tooth shoe in the circumferential direction is set to 0.1 to 0.4, and in the case where the protrusions and the recesses, or the protrusions and the straight portions are provided on the rotor sheet, the cogging torque of the motor can be reduced by 60%, and the overload capacity of the motor can be improved by 3%.

By setting the ratio of the width of the notch of the stator groove in the circumferential direction to the width of the tooth shoe in the circumferential direction to 0.1 to 0.4 and fitting with the protrusion and the recess or the protrusion and the linear portion, it is also possible to reduce the peak value of the cogging torque while improving the power density of the motor.

In one embodiment of the utility model, an industrial apparatus is provided comprising a motor according to any of the above claims. The industrial equipment thus has the full effect of a motor according to any of the above-mentioned claims.

Industrial equipment includes automated equipment such as machine tools, manipulators, robots, and the like.

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

Drawings

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

FIG. 1 is one of the structural schematic diagrams of a rotor sheet according to one embodiment of the present disclosure;

FIG. 2 is a second schematic view of a rotor sheet according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a comparison of the cogging torque of a rotor without protrusions versus a rotor with protrusions;

FIG. 4 is one of the partial schematic views of a rotor sheet according to one embodiment of the utility model;

FIG. 5 is a second schematic partial view of a rotor sheet according to one embodiment of the utility model;

fig. 6 is a schematic structural view of an electric motor according to an embodiment of the present utility model;

fig. 7 is a schematic structural view of a stator core according to an embodiment of the present utility model;

fig. 8 is a partial schematic view of a stator core according to an embodiment of the present utility model;

fig. 9 is a schematic diagram of variation of slot width of a stator slot of a motor according to an embodiment of the present utility model with respect to overload torque.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 8 is:

100 rotor punching sheets, 110 bodies, 120 rotor slots, 130 first magnetism isolating bridges, 140 second magnetism isolating bridges, 210 bulges, 212 first circular arc parts, 214 second circular arc parts, 222 concave parts, 224 straight line parts, 300 stator cores, 310 core blocks, 312 yoke parts, 314 tooth parts, 316 tooth shoes, 320 stator slots, 400 coils and 500 permanent magnets.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, 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 utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

A rotor sheet 100, a rotor core, a motor, and an industrial apparatus according to some embodiments of the present utility model are described below with reference to fig. 1 to 9.

In one embodiment of the present utility model, as shown in fig. 1 and 2, there is provided a rotor sheet 100 including a body 110 and a recess 222, or including a body 110 and a straight portion 224, the recess 222 or the straight portion 224 being provided at an edge of the body.

In this embodiment, the rotor punching sheet 100 includes a body 110, and the concave portion 222 or the linear portion 224 is disposed at an edge of the body, so as to implement topology of an outer ring of the rotor punching sheet 100, thereby reducing a peak value of cogging torque generated by interaction between the permanent magnet 500 and the stator core, and improving control accuracy of the motor.

Specifically, as shown in fig. 3, since the concave portion 222 or the linear portion 224 is provided at the edge of the body 110, the peak value of the cogging torque of the motor can be reduced by the concave portion 222 or the linear portion 224, so that the torque ripple of the motor is reduced. Because the torque fluctuation of the motor is reduced, the motor is easier to control, the control precision of the motor is improved, and the quality of the motor is further improved. When the motor is applied to industrial equipment, the control accuracy of the motor is improved, so that the control progress of the industrial equipment is improved, the control design of the industrial equipment is facilitated, and the quality of the industrial equipment is improved.

The present embodiment provides a rotor sheet 100, which further includes the following technical features in addition to the technical features of the above-described embodiments.

The rotor punching 100 further includes a protrusion 210, the protrusion 210 is connected to the body 110, protrudes from an edge of the body 110 along a radial direction of the body 110, and a recess 222 or a linear portion 224 is disposed on a side of the protrusion 210 away from the body 110 in the radial direction.

In this embodiment, the body 110 may be circular, or may be changed according to the shape of the protrusion 210, so that the body 110 can be adapted to the protrusion 210. The protrusion 210 is connected to the body 110 and is located on the outer rim of the body 110. The protrusion 210 protrudes in a direction away from the center of the body 110 with respect to the outer circumferential edge of the body 110, and the recess 222 or the straight line portion 224 is located on an edge of the protrusion 210 on a side away from the body 110. By matching the protrusions 210 with the concave portions 222 or the linear portions 224, the outer ring of the rotor punching sheet 100 is topologically repaired, so that the peak value of cogging torque generated by interaction between the permanent magnets 500 and the stator core is reduced, and the control precision of the motor is improved.

As shown in fig. 4, the recess 222 is provided on the protrusion 210, and is recessed from a side of the protrusion 210 away from the body 110 toward the center of the body 110.

In this embodiment, the recess 222 is provided on the protrusion 210, the recess 222 is located at an edge of a side of the protrusion 210 away from the body 110, and is recessed from the edge of the side of the protrusion 210 away from the body 110 toward the center of the body 110, and an opening of the recess 222 is directed toward the stator core 300. By providing the recess 222 on the protrusion 210, a peak value of cogging torque generated by interaction between the permanent magnet 500 and the stator core is reduced, and accuracy of the motor is improved.

Further, the recess 222 may be a semicircular groove, the recess 222 may be a rectangular groove, the recess 222 may be a triangular groove, and the recess 222 may be a polygonal groove or an irregularly shaped groove.

As shown in fig. 5, the straight portion 224 is disposed on the protrusion 210, and linearly extends along a side of the protrusion 210 away from the body 110.

In this embodiment, the straight portion 224 is disposed on the protrusion 210, and the straight portion 224 is located at an edge of a side of the protrusion 210 away from the body 110 and extends linearly along a tangential direction of the recess 222 or a position where a center line of the straight portion 224 in a radial direction is located, that is, the edge of the side of the straight portion 224 away from the body 110 extends linearly. By providing the straight portions 224 on the protrusions 210, a peak value of cogging torque generated by interaction between the permanent magnets 500 and the stator core is reduced, and accuracy of the motor is improved.

As shown in fig. 4 and 5, the protrusion 210 includes a first circular arc portion 212 and a second circular arc portion 214; the first circular arc portion 212 is located on a first side of the concave portion 222 or the straight portion 224 in the circumferential direction; the second circular arc portion 214 is located on a second side of the concave portion 222 or the straight portion 224 in the circumferential direction.

In this embodiment, the two sides of the concave portion 222 or the straight portion 224 are respectively provided with the first arc portion 212 and the second arc portion 214, and the first arc portion 212, the second arc portion 214 and the concave portion 222 or the straight portion 224 are matched, so as to further realize the topology of the outer circle of the rotor sheet 100, further reduce the peak value of the cogging torque generated by the interaction between the permanent magnet 500 and the stator core, and improve the precision of the motor.

Specifically, the edges of the first and

second arc portions

212 and 214 on the side far from the body 110 are arc-shaped, and the centers of the edges of the first and

second arc portions

212 and 214 on the side far from the body 110 coincide.

Further, the edges of the first and

second arc portions

212 and 214 at the side far from the body 110 do not coincide with the center of the circle where the outer ring of the body 110 is located.

As shown in fig. 4 and 5, the first and second

circular arc portions

212 and 214 are symmetrical with respect to the concave portion 222 or the straight portion 224.

In this embodiment, the first arc portion 212 and the second arc portion 214 are symmetrical with respect to the concave portion 222 or the straight portion 224, so that the rotor core formed by the rotor sheet 100 is stressed more uniformly in the magnetic field generated by the stator assembly, thereby reducing the vibration generated by the rotor core during the rotation process, and further improving the control accuracy of the motor.

Specifically, the concave portion 222 or the straight portion 224 has a symmetry line in the radial direction, and the concave portion 222 or the straight portion 224 is symmetrical with respect to the symmetry line, and the first circular arc portion 212 and the second circular arc portion 214 are symmetrical with respect to the symmetry line.

As shown in fig. 1 and 2, the number of the protrusions 210 is plural, and the plurality of protrusions 210 are arranged along the circumferential direction of the body 110.

In this embodiment, the number of the protrusions 210 is plural, and the protrusions 210 are arranged along the circumferential direction of the body 110, so as to further realize the topology of the outer circle of the rotor sheet 100, further reduce the peak value of the cogging torque generated by the interaction between the permanent magnet 500 and the stator core, and improve the accuracy of the motor. The plurality of protrusions 210 are arranged along the circumferential direction of the body 110, so that the uniformity of stress of the rotor core formed by the rotor punching sheet 100 in the magnetic field generated by the stator assembly is further improved, vibration generated by the rotor core in the rotation process is reduced, and the control precision of the motor is further improved.

As shown in fig. 1 and 2, the rotor sheet 100 further includes a plurality of rotor grooves 120, the plurality of rotor grooves 120 being arranged along the circumferential direction of the body 110; wherein the number of the plurality of rotor grooves 120 is the same as the number of the plurality of protrusions 210.

In this embodiment, the rotor sheet 100 further includes a plurality of rotor grooves 120, the plurality of rotor grooves 120 being arranged along the circumferential direction of the body 110, the plurality of rotor grooves 120 enabling the installation and fixation of the permanent magnets 500, thereby enabling the rotor core composed of the rotor sheet 100 to be rotated by the stator assembly. The number of the plurality of rotor grooves 120 is the same as the number of the plurality of protrusions 210, so that the number of the protrusions 210 corresponds to the number of the rotor grooves 120, torque fluctuation of the motor is further reduced, and control accuracy of the motor is improved.

As shown in fig. 1 and 2, each rotor slot 120 of the plurality of rotor slots 120 extends in a radial direction, and the rotor sheet 100 further includes a first magnetic barrier bridge 130, the first magnetic barrier bridge 130 being disposed on a side of the rotor slot 120 away from the center of the body 110, between adjacent protrusions 210 of the plurality of protrusions 210.

In this embodiment, the rotor punching sheet 100 further includes a first magnetic isolation bridge 130, where the first magnetic isolation bridge 130 is disposed on a side of the rotor slot 120 away from the center of the body 110 and is located between adjacent protrusions 210 of the plurality of protrusions 210, so as to reduce magnetic leakage of the rotor slot 120, improve torque of the motor, and further improve performance of the motor.

As shown in fig. 1 and 2, the rotor sheet 100 further includes a second magnetic barrier bridge 140, the second magnetic barrier bridge 140 being disposed between adjacent rotor slots 120 of the plurality of rotor slots 120.

In this embodiment, a second magnetic barrier bridge 140 is disposed between two adjacent rotor slots 120, further reducing magnetic leakage of the rotor slots 120, increasing the torque of the motor, and further improving the performance of the motor.

Further, the rotor punching sheet 100 is further provided with a magnetic isolation slot, the magnetic isolation slot is disposed on one side of the rotor slot 120 near the center of the body 110, and the magnetic isolation slot is communicated with the rotor slot 120.

In the case where the number of the magnetism isolating grooves is two, the two magnetism isolating grooves are provided on both sides of the rotor groove 120 in the circumferential direction.

The rotor slots 120 may be filled with air, i.e., the magnetic isolation slots may not be filled with any magnetic isolation material.

The rotor groove 120 can be filled with magnetism isolating material, and the magnetism isolating material and the air can be filled to further reduce magnetism leakage, so that the performance of the motor is improved.

A positioning part protruding into the rotor groove 120 is arranged at one side of the rotor groove 120, which is close to the center of the body 110, and when the permanent magnet 500 is installed in the rotor groove 120, the positioning part abuts against the permanent magnet 500, so that the positioning of the permanent magnet 500 is realized, and the accuracy of the position of the permanent magnet 500 is improved.

In one embodiment of the present utility model, there is provided a rotor core including a plurality of rotor sheets 100 of any of the embodiments described above, the plurality of rotor sheets 100 being arranged in the axial direction.

Since the rotor core includes a plurality of rotor sheets 100 according to any one of the embodiments described above, the rotor core has all the advantageous effects of the rotor sheets 100 according to any one of the embodiments described above.

Further, the rotor blade 100 is formed by punching or cutting a silicon steel sheet.

Each formed rotor punching sheet 100 is provided with a rivet point, and axially adjacent rotor punching sheets 100 are connected by the rivet point.

The plurality of rotor sheets 100 arranged in the axial direction may also be fixed by glue, such as insulating glue.

The plurality of rotor sheets 100 disposed in the axial direction may also be fixed by welding.

Further, the rotor core is provided with permanent magnets 500, the permanent magnets 500 are magnetic steel, the number of the permanent magnets 500 is a plurality of, and each permanent magnet 500 is arranged along the radial direction and is matched with the rotor groove 120.

The plurality of permanent magnets 500 are inserted into the rotor core in a spoke type, the magnetizing directions of the plurality of permanent magnets 500 are circumferential, and the magnetizing directions of two adjacent pieces of magnetic steel in the plurality of permanent magnets 500 are opposite.

In one embodiment of the present utility model, there is provided an electric motor including a stator core 300 and a rotor core according to any of the above embodiments, the stator core 300 being adapted to the rotor core.

Since the motor includes the rotor core of any of the embodiments described above, the motor has all the advantageous effects of the rotor core of any of the embodiments described above.

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

As shown in fig. 6, the stator core 300 includes a yoke 312 and a plurality of teeth 314, the plurality of teeth 314 are connected to the yoke 312, and are arranged in the circumferential direction of the yoke 312, with a stator slot 320 between two adjacent teeth 314 of the plurality of teeth 314.

In this embodiment, the stator core includes a yoke 312 and a plurality of teeth 314, the plurality of teeth 314 are connected to the yoke 312 and distributed along a circumferential direction of the yoke 312, and stator slots 320 are formed between adjacent teeth 314 of the plurality of teeth 314, thereby forming the stator core.

Further, the yoke 312 is annularly distributed, the plurality of teeth 314 are distributed along the inner ring of the yoke 312, and the rotor core can be embedded in the stator core, thereby forming an inner rotor motor.

Further, the stator core includes a plurality of core blocks 310, each core block 310 of the plurality of core blocks 310 includes a yoke portion 312 and a tooth portion 314, the yoke portion 312 is arc-shaped, the tooth portion 314 is connected with the yoke portion 312, the plurality of core blocks 310 are circumferentially arranged, and two adjacent core blocks 310 are connected, thereby forming the stator core.

The core block 310 may have a T-shape, and the stator core 300 may be formed of the T-shaped stator core 300, insulation frames covering the outside of the stator core 300, and windings wound on each of the insulation frames.

The insulating frame is formed by 3D printing or die forming of a polymer composite material, and large notch parts are filled near the notch of the stator core 300 so as to prevent winding wires from sliding out.

The core block 310 is formed by punching or cutting a sheet of silicon steel, and each formed stator lamination is connected by riveting points, glue or welding.

As shown in fig. 1 and 7, the ratio of the width b of the notch of the stator groove 320 in the circumferential direction to the width a of the recess 222 in the circumferential direction is 0.3 or more and 1 or less. The ratio of the width b of the slot opening of the stator slot 320 in the circumferential direction to the width a of the straight line portion 224 in the circumferential direction is 0.3 or more and 1 or less.

In this embodiment, the width b of the slot opening of the stator slot 320 in the circumferential direction is a first width, the width a of the concave portion 222 or the linear portion 224 in the circumferential direction is a second width, and the ratio of the first fast reading to the second width is 0.3 to 1, so that the width of the stator slot 320 matches with the width of the concave portion 222 or the linear portion 224, thereby reducing the peak value of the cogging torque and improving the control accuracy of the motor.

As shown in fig. 6, the motor further includes a plurality of groups of coils 400, and the plurality of groups of coils 400 are respectively wound on the plurality of teeth 314; wherein, the ratio of the number of turns of two adjacent coils 400 in the plurality of coils 400 is greater than or equal to 1.5 and less than or equal to 2.

In this embodiment, the plurality of sets of coils 400 are respectively wound on the plurality of teeth 314, so as to fix the plurality of sets of coils 400, so that the plurality of sets of coils 400 can be used as windings to generate an electromagnetic field, and further drive the rotor. The ratio of the turns of two adjacent coils 400 in the plurality of groups of coils 400 is 1.5 to 2, the winding coefficient is adjusted by adjusting the ratio of the turns of two adjacent coils 400 in the plurality of groups of coils 400, and the ratio of the turns of two adjacent coils 400 in the plurality of groups of coils 400 is set between 1.5 and 2, so that the winding coefficient of the motor can be improved, and the overload capacity of the motor is further improved.

Further, the stator core 300 is externally coated with an insulation frame on which the coil 400 is wound.

Further, the ratio of the number of turns of two adjacent sets of coils 400 in the plurality of sets of coils 400 may also be 1.

As shown in fig. 7 and 8, the stator core 300 further includes a tooth shoe 316, and the tooth shoe 316 is connected to an end of the tooth 314 remote from the yoke 312; wherein, the ratio of the width b of the notch of the stator slot 320 in the circumferential direction to the width c of the tooth shoe 316 in the circumferential direction is greater than or equal to 0.1 and less than or equal to 0.4.

In this embodiment, by setting the ratio of the width b of the notch of the stator slot 320 in the circumferential direction to the width c of the tooth shoe 316 in the circumferential direction to 0.1 to 0.4, the width b of the notch of the stator slot 320 in the circumferential direction is increased, thereby improving the no-load counter potential and the overload torque of the motor.

Specifically, as shown in fig. 9, by setting the ratio of the width b of the slot opening of the stator slot 320 in the circumferential direction to the width c of the tooth shoe 316 in the circumferential direction to 0.1 to 0.4 such that the width b of the slot opening in the circumferential direction increases, the motor having the stator core with the increased slot opening width can increase the operating subharmonic content of the motor flux density as compared with the motor having the stator core with the slot opening of the stator slot 320 not increased, and can achieve a higher back electromotive force in a state of low fundamental flux density, high harmonic flux density by the fractional slot concentrated winding self-contained magnetic field modulation effect; and the increased notch is beneficial to relieving the magnetic saturation of the tooth part 314 under high overload, so that the linearity of the motor is improved, and higher overload torque is realized; in this case, the overload capacity of the motor having the enlarged stator slot 320 port is improved by 7% as compared to the motor having no enlarged stator slot 320 port.

And through setting up protruding 210 and concave part 222 on rotor punching 100, or setting up protruding 210 and straight line portion 224, protruding 210 cooperates with concave part 222, protruding 210 cooperates with straight line portion 224, can all realize the trailing and mending to the rotor outer lane, while promoting motor overload capacity through increasing the width of the notch of stator groove 320, reduce the peak value of motor cogging torque, avoid leading to the cogging torque to worsen because of the notch increase of stator groove 320.

The ratio of the width of the slot opening of the stator slot 320 in the circumferential direction to the width of the tooth shoe 316 in the circumferential direction is set to 0.1 to 0.4, and in the case where the protrusions 210 and the recesses 222, or the protrusions 210 and the straight portions 224 are provided on the rotor sheet 100, the cogging torque of the motor can be reduced by 60%, and the overload capability of the motor can be improved by 3%.

By setting the ratio of the width of the notch of the stator groove 320 in the circumferential direction to the width of the tooth shoe 316 in the circumferential direction to 0.1 to 0.4, and the protrusion 210 and the recess 222 are engaged, or the protrusion 210 and the straight portion 224 are engaged, the peak value of the cogging torque can also be reduced while the power density of the motor is improved.

In one embodiment of the utility model, an industrial device is provided comprising a motor as in any of the embodiments described above. The industrial equipment thus has the full effect of the motor according to any of the embodiments described above.

In one embodiment of the utility model, an electrical appliance is provided comprising a motor as in any of the embodiments described above. The appliance thus has the full effect of the motor of any of the embodiments described above.

In one embodiment of the utility model, a vehicle is provided that includes an electric machine as in any of the embodiments described above. The vehicle thus has the full effect of the electric machine of any of the embodiments described above.

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

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

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

Claims

1. A rotor punching sheet, comprising:

a body;

a recess or a straight portion provided at an edge of the body.

2. The rotor as recited in claim 1, further comprising:

the protrusion is connected with the body, protrudes out of the edge of the body along the radial direction of the body, and the concave part or the linear part is arranged on one side, away from the body, of the protrusion in the radial direction.

3. The rotor punching of claim 2, wherein the recess is provided on the projection, and a side of the projection away from the body is recessed toward a center of the body.

4. The rotor punching sheet according to claim 2, characterized in that the straight portion is provided on the projection, extending linearly along a side of the projection away from the body.

5. The rotor chip of claim 2, wherein the protrusions comprise:

a first circular arc portion located on a first side of the concave portion or the straight line portion in the circumferential direction;

and a second circular arc portion located on a second side of the concave portion or the linear portion in the circumferential direction.

6. The rotor blade of claim 5, wherein the first and second arcuate portions are symmetrical with respect to the recess or the straight portion.

7. A rotor sheet according to any one of claims 2 to 6, wherein the number of the protrusions is plural, and a plurality of the protrusions are arranged in the circumferential direction of the body.

8. The rotor as recited in claim 7, further comprising:

a plurality of rotor grooves arranged along a circumferential direction of the body;

wherein the number of the plurality of rotor grooves is the same as the number of the plurality of the protrusions.

9. The rotor sheet of claim 8, wherein each rotor slot of the plurality of rotor slots extends radially, the rotor sheet further comprising:

the first magnetism isolating bridge is arranged on one side, far away from the center of the body, of the rotor groove and is positioned between adjacent protrusions in the protrusions.

10. The rotor as recited in claim 8, further comprising:

and the second magnetic isolation bridge is arranged between adjacent rotor grooves in the plurality of rotor grooves.

11. A rotor core, comprising: a plurality of rotor laminations as claimed in any one of claims 1 to 10, the plurality of rotor laminations being arranged axially.

12. An electric machine, comprising:

the rotor core of claim 11;

and the stator core is matched with the rotor core.

13. The electric machine of claim 12, wherein the stator core comprises:

a yoke;

and the plurality of teeth are connected with the yoke part and are arranged along the circumferential direction of the yoke part, and a stator groove is formed between two adjacent teeth in the plurality of teeth.

14. The motor according to claim 13, wherein a ratio of a width of a notch of the stator groove in a circumferential direction to a width of the recess in the circumferential direction is 0.3 or more and 1 or less;

the ratio of the width of the notch of the stator groove in the circumferential direction to the width of the straight line part in the circumferential direction is more than or equal to 0.3 and less than or equal to 1.

15. The electric machine of claim 13 or 14, further comprising:

the plurality of groups of coils are respectively wound on the plurality of tooth parts;

the ratio of the turns of two adjacent groups of coils in the plurality of groups of coils is more than or equal to 1.5 and less than or equal to 2.

16. The electric machine of claim 13 or 14, wherein the stator core further comprises:

a tooth shoe connected with one end of the tooth part far away from the yoke part;

the ratio of the width of the notch of the stator groove in the circumferential direction to the width of the tooth shoe in the circumferential direction is more than or equal to 0.1 and less than or equal to 0.4.

17. An industrial plant comprising an electric machine as claimed in any one of claims 12 to 16.