CN210985764U

CN210985764U - Rotor punching sheet and motor

Info

Publication number: CN210985764U
Application number: CN201922056555.9U
Authority: CN
Inventors: 邹小松; 杨宁宁; 牛玉林
Original assignee: BYD Co Ltd; Changsha BYD Automobile Co Ltd
Current assignee: BYD Co Ltd; Changsha BYD Automobile Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-10
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a rotor punching and motor. The rotor punching sheet comprises a punching sheet body, a plurality of first magnetic grooves and a plurality of second magnetic grooves, the first magnetic grooves comprise first through holes and second through holes, the first through holes and the second through holes are arranged at intervals, a first V-shaped structure is formed between the first through holes and the second through holes, the second magnetic grooves comprise third through holes and fourth through holes, the third through holes and the fourth through holes are arranged at intervals, a second V-shaped structure is formed between the third through holes and the fourth through holes, openings of the first V-shaped structure and the second V-shaped structure face the outer side of the punching sheet body, and the third through holes and the fourth through holes are located between the first through holes and the second through holes along the circumferential direction. According to the utility model discloses a rotor punching, all can insert the magnet steel in first magnetic slot and the second magnetic slot for the magnet steel receives centrifugal force's lifting surface area less, has reduced the inside tensile stress of magnet steel, has promoted the life-span of magnet steel.

Description

Rotor punching sheet and motor

Technical Field

The utility model relates to the technical field of electric machines, particularly relate to a rotor punching and motor.

Background

With the continuous development of the new energy automobile industry, the strength of the rotor of the motor in the automobile also needs to be continuously improved. In the machine, the magnetic circuit also needs to be optimized for better performance of the machine. As shown in fig. 1, a rotor punching sheet of an electric machine generally comprises a punching sheet body 1, a permanent magnet groove group, an axial cooling channel 8 and a shaft hole 9. The shaft hole 9 is located the center of punching the piece body 1, is provided with 8 permanent magnet groove groups on punching the piece body 1, and 8 permanent magnet groove groups are arranged along the circumference direction interval of punching the piece body 1. And an axial cooling channel 8 is arranged between the shaft hole 9 and the permanent magnet groove group in the radial direction of the punching sheet body 1. Can be provided with 8 axial cooling channel 8 towards piece body 1 on, 8 axial cooling channel 8 set up along the circumference direction interval towards piece body 1.

The permanent magnet slot group comprises 1 main

permanent magnet slot

2 and 2 auxiliary permanent magnet slots 3, and the main permanent magnet slot 2 and the auxiliary permanent magnet slots 3 are used for accommodating magnetic steel. The 2 auxiliary permanent magnet grooves 3 are arranged in a V shape and are close to the shaft hole 9, the main permanent magnet groove 2 is positioned at the V-shaped opening, and the main permanent magnet groove 2 is not in contact with the auxiliary permanent magnet grooves 3. The permanent magnet slot group also comprises main magnetism isolating holes 4 and auxiliary magnetism isolating holes 5, wherein 2 main magnetism isolating holes 4 are respectively positioned at two opposite ends of the main

permanent magnet slot

2, and 2 auxiliary magnetism isolating holes 5 are respectively positioned at two opposite ends of the V-shaped opening of the auxiliary permanent magnet slot 3. A main reinforcing rib 6 is arranged between the main permanent magnet groove 2 and the main magnetic isolation hole 4, and an auxiliary reinforcing rib 7 is arranged between the auxiliary permanent magnet groove 3 and the auxiliary magnetic isolation hole 5. However, when the rotor punching sheet rotates at a high speed, the magnetic steel is subjected to a large centrifugal force, the permanent magnet groove group is easily damaged, and particularly, the main permanent magnet groove 2 is easily damaged.

Therefore, the utility model provides a rotor punching and motor for solve the problem among the prior art at least partially.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

The utility model provides a rotor punching sheet, rotor punching sheet includes:

punching a sheet body;

the first magnetic grooves are arranged at intervals along the circumferential direction of the punching sheet body and comprise first through holes and second through holes which are arranged at intervals, a first V-shaped structure is formed between the first through holes and the second through holes, and the opening of the first V-shaped structure faces the outer side of the punching sheet body; and

the second magnetic grooves are arranged at intervals along the circumferential direction of the punching sheet body and comprise third through holes and fourth through holes which are arranged at intervals, a second V-shaped structure is formed between the third through holes and the fourth through holes, the opening of the second V-shaped structure faces the outer side of the punching sheet body,

the third through hole and the fourth through hole are located between the first through hole and the second through hole along the circumferential direction.

According to the utility model discloses a rotor punching sheet, rotor punching sheet is including towards the piece body, be provided with a plurality of first magnetic grooves and a plurality of second magnetic groove towards the piece body, all can insert the magnet steel in first magnetic groove and the second magnetic groove, make the magnet steel receive centrifugal force's lifting surface area less, the inside tensile stress of magnet steel has been reduced, the life-span of magnet steel has been promoted, the rotor is towards the harmonic of the air gap magnetic density of piece and can obtain effectual suppression, the iron loss has been reduced by a wide margin, the sine degree of counter electromotive force has greatly been improved, be favorable to improving reluctance torque.

Optionally, an included angle between the first through hole and the second through hole is larger than an included angle between the third through hole and the fourth through hole.

Optionally, the first through hole includes a first inner end, the second through hole includes a second inner end, and a magnetism isolating hole is arranged between the first inner end and the second inner end.

Optionally, a first connecting section is arranged between the first inner end and the magnetism isolating hole, a second connecting section is arranged between the second inner end and the magnetism isolating hole, and the first connecting section is parallel to the second connecting section.

Optionally, a third connecting section is arranged between the third through hole and the fourth through hole, and a center line of the third connecting section along the circumferential direction coincides with a center line of the magnetism isolating hole in the radial direction of the punching sheet body.

Optionally, the first magnetic groove and the second magnetic groove both include outer ends, the outer ends of the first magnetic groove and the second magnetic groove flush along the circumferential direction of the punching sheet body, a groove is arranged at the edge of the punching sheet body, and the projection of the groove along the radial direction of the punching sheet body is located in the third through hole or the fourth through hole.

Optionally, a distance between adjacent first magnetic grooves is greater than a distance between adjacent first through holes and adjacent third through holes.

Optionally, the first magnetic groove includes a first hole wall and a first protrusion, the first protrusion protrudes from the first hole wall toward the second magnetic groove, and the second magnetic groove includes a second hole wall and a second protrusion, the second protrusion protrudes from the second hole wall toward a direction away from the first magnetic groove.

Optionally, the stamping sheet further comprises a plurality of lightening holes, the plurality of lightening holes are all arranged on the stamping sheet body, the section of each lightening hole is in a T shape on a plane perpendicular to the axial direction of the stamping sheet body, the plurality of lightening holes are arranged at intervals along the circumferential direction, and the lightening holes and the first magnetic grooves are arranged in a staggered mode in the circumferential direction.

The utility model also provides a motor, the motor includes foretell rotor punching.

According to the utility model discloses a motor, the motor includes the rotor punching, the rotor punching is including towards the piece body, be provided with a plurality of first magnetic grooves and a plurality of second magnetic groove towards on the piece body, all can insert the magnet steel in first magnetic groove and the second magnetic groove, make the magnet steel receive centrifugal force's lifting surface less, the inside tensile stress of magnet steel has been reduced, the life-span of magnet steel has been promoted, the rotor can obtain effectual suppression towards the harmonic of the air gap magnetic density of piece, the iron loss has been reduced by a wide margin, the sine degree of counter electromotive force has greatly been improved, be favorable to improving reluctance torque, the magnetic circuit has been optimized, the performance of motor has been improved.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention.

In the drawings:

fig. 1 is a front view of a conventional rotor sheet;

fig. 2 is a front view of a rotor sheet according to an embodiment of the present invention;

fig. 3 is a partially enlarged view of a portion a in fig. 2; and

fig. 4 is a partially enlarged view of a portion B in fig. 2.

Description of reference numerals:

1: towards piece body 2: main permanent magnet slot

3: auxiliary permanent magnet slot 4: main magnetic isolation hole

5: auxiliary magnetic isolation hole 6: main reinforcing rib

7: and (3) auxiliary reinforcing ribs 8: axial cooling channel

9: shaft hole 100: punching sheet body

110: first magnetic groove 111: first through hole

112: second through hole 113: first inner end

114: second inner end 115: first outer end

116: second outer end 117: first connecting section

118: second connection section 119: first hole wall

120: first protrusion 130: second magnetic groove

131: third through hole 132: fourth through hole

133: third inner end 134: the fourth inner end

135: third outer end 136: fourth outer end

137: third connection segment 138: the first groove

139: second groove 140: second hole wall

141: second projection 150: magnetism isolating hole

151: the lightening holes 152: locating hole

153: shaft hole 154: engaging part

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It is apparent that the practice of the invention is not limited to the specific details known to those skilled in the art. The present invention is described in detail below with reference to the preferred embodiments, however, the present invention can have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.

It is to be understood that the terms "a," "an," and "the" as used herein are intended to describe specific embodiments only and are not to be taken as limiting the invention, which is intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for illustrative purposes only and are not limiting.

Ordinal words such as "first" and "second" are referred to in this application as labels only, and do not have any other meanings, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and do not limit the present invention.

The utility model provides a preferred embodiment's rotor punching, a plurality of rotor punching can stack in order to form rotor core along the axial direction of rotor punching, and rotor core sets up in the motor. The motor can be applied to new energy vehicles. The utility model provides a rotor punching has better structural strength, like this, under the unchangeable condition of the volume of motor, can promote rotor core's rotational speed to promote the power density of motor.

Specifically, as shown in fig. 2, the rotor punching sheet may include a punching sheet body 100, a plurality of first magnetic grooves 110 and a plurality of second magnetic grooves 130, and the plurality of first magnetic grooves 110 and the plurality of second magnetic grooves 130 are all disposed on the punching sheet body 100. The cross-sectional shape of the lamination body 100 may be substantially circular in a plane perpendicular to the axial direction of the rotor lamination. The diameter of the punch body 100 may be approximately 150 mm. The axial direction of the punching sheet body 100 can be parallel to the axial direction of the rotor punching sheet, and the thickness direction of the punching sheet body 100 is parallel to the axial direction of the rotor punching sheet. The plurality of punching sheets 100 can be stacked along the axial direction of the rotor punching sheets, the first magnetic grooves 110 on each punching sheet 100 correspond to each other, and one magnetic steel can penetrate through the first magnetic grooves 110 of the plurality of punching sheets 100 along the axial direction of the rotor punching sheets. The second magnetic grooves 130 on each punching sheet body 100 correspond to each other, and another magnetic steel can penetrate through the second magnetic grooves 130 of the punching sheets bodies 100 along the axial direction of the rotor punching sheet. The punching sheet body 100 may be made of silicon steel.

Further, in order to ensure that the plurality of punching sheet bodies 100 are arranged in order along the axial direction, as shown in fig. 2 and 4, the rotor punching sheet further includes a shaft hole 153 and a clamping portion 154, and the shaft hole 153 is disposed in the center of the punching sheet body 100. The diameter of the shaft hole may be 45 mm. A rotating shaft (not shown) of the motor may extend through the shaft holes 153 of the plurality of punching sheet bodies 100 in the axial direction to ensure the coaxiality of the plurality of punching sheet bodies 100.

In order to prevent the punch main body 100 from sliding relative to the rotating shaft during high-speed rotation, the engaging portion 154 protrudes from the hole wall of the hole 153 toward the center of the hole 153. Preferably, two clamping portions 154 may be provided on the punching sheet body 100, and the two clamping portions 154 are symmetrically arranged about a central axis of the punching sheet body 100 and both protrude toward a central direction of the shaft hole 153. The rotating shaft is provided with a matching groove, and the clamping part 154 can be plugged together with the matching groove. Like this, be favorable to strengthening the cooperation intensity between pivot and the towards piece body 100, and then promote the stability of motor when operation, ensured the security, reduced the vibration noise of motor.

The first magnetic grooves 110 may be arranged at intervals along the circumferential direction of the punching sheet body 100. For example, 8 first magnetic grooves 110 are provided on the punching sheet body 100 shown in fig. 2, but the number of the first magnetic grooves 110 may be changed according to actual situations, and may be, for example, 6 or 10. Each of the first magnetic grooves 110 may include a first through hole 111 and a second through hole 112, the first through hole 111 and the second through hole 112 may be spaced apart, and the first through hole 111 and the second through hole 112 are not communicated with each other. And a first V-shaped structure is formed between the first through hole 111 and the second through hole 112, and an opening of the first V-shaped structure faces to the outer side of the punching sheet body 100.

As shown in fig. 3, the first through hole 111 includes a first inner end 113 and a first outer end 115, and the first outer end 115 is located outside the first inner end 113 in the radial direction of the punching sheet body 100. On a plane perpendicular to the axial direction of the sheet body, the cross-sectional shape of the first through hole 111 is substantially ^ jeopardy. The second through hole 112 includes a second inner end 114 and a second outer end 116, and the second outer end 116 is located outside the second inner end 114 along the radial direction of the punching sheet body 100. The cross-sectional shape of the second through hole 112 is substantially ^ integer on a plane perpendicular to the axial direction of the sheet body. The distance between the first outer end 115 and the second outer end 116 in the circumferential direction of the punch body 100 is greater than the distance between the first inner end 113 and the second inner end 114.

As described above, magnetic steel (not shown) may be inserted into the first magnetic groove 110, thereby forming a magnetic pole. Specifically, a first magnetic steel may be inserted into the first through hole 111, and a second magnetic steel may be inserted into the second through hole 112. After the rotor punching sheets are sleeved on the rotating shaft, the first through holes 111 on the rotor punching sheets can correspond to each other, and the first magnetic steel can be inserted into the first through holes 111 of the rotor punching sheets along the axial direction. When the rotor punching sheet rotates, especially when the rotor punching sheet rotates at a high speed, the stress area of the first magnetic steel subjected to centrifugal force can be smaller, the tensile stress in the first magnetic steel is reduced, and the service life of the first magnetic steel is prolonged. The second through holes 112 on the multiple rotor sheets may correspond to each other, and the second magnetic steel may be inserted into the second through holes 112 of the multiple rotor sheets along the axial direction. When the rotor punching sheet rotates, especially when the rotor punching sheet rotates at a high speed, the stress area of the second magnetic steel subjected to centrifugal force can be smaller, the tensile stress in the second magnetic steel is reduced, and the service life of the second magnetic steel is prolonged.

A first V-shaped structure is formed between the first through hole 111 and the second through hole 112, so that acting force can be respectively applied to the first magnetic steel and the second magnetic steel through the first V-shaped structure, the influence of centrifugal force on the first magnetic steel and the second magnetic steel is reduced, the structural strength of the rotor punching sheet is enhanced, the possibility of breakage of the second magnetic groove 130 is avoided, and the service life of the rotor punching sheet is prolonged.

The plurality of second magnetic grooves 130 may be disposed at intervals along the circumferential direction of the punching sheet body 100. For example, 8 second magnetic grooves 130 are provided on the punching sheet body 100 shown in fig. 2, and of course, the number of the second magnetic grooves 130 may be changed according to actual situations, and may be, for example, 6 or 10. As shown in fig. 3, each of the second magnetic grooves 130 may include a third through hole 131 and a fourth through hole 132, the third through hole 131 and the fourth through hole 132 may be spaced apart from each other, and the third through hole 131 and the fourth through hole 132 are not communicated with each other. And a second V-shaped structure is formed between the third through hole 131 and the fourth through hole 132, and an opening of the second V-shaped structure faces the outer side of the punching sheet body 100.

The third through hole 131 includes a third inner end 133 and a third outer end 135, and the third outer end 135 is located outside the third inner end 133 along the radial direction of the punching sheet body 100. The fourth through hole 132 includes a fourth inner end 134 and a fourth outer end 136, and the fourth outer end 136 is located outside the fourth inner end 134 along the radial direction of the punching sheet body 100. The distance between the third outer end 135 and the fourth outer end 136 in the circumferential direction of the punch body 100 is greater than the distance between the third inner end 133 and the fourth inner end 134.

As described above, magnetic steel (not shown) may be inserted into the second magnetic groove 130, thereby forming a magnetic pole. Specifically, a third magnetic steel may be inserted into the third through hole 131, and a fourth magnetic steel may be inserted into the fourth through hole 132. After the rotor punching sheets are sleeved on the rotating shaft, the third through holes 131 on the rotor punching sheets can correspond to each other, and the third magnetic steel can be inserted into the third through holes 131 of the rotor punching sheets along the axial direction. When the rotor punching sheet rotates, particularly when the rotor punching sheet rotates at a high speed, the stress area of the third magnetic steel subjected to centrifugal force can be smaller, the tensile stress in the third magnetic steel is reduced, and the service life of the third magnetic steel is prolonged. The fourth through holes 132 on the multiple rotor punching sheets may correspond to each other, and the fourth magnetic steel may be inserted into the fourth through holes 132 of the multiple rotor punching sheets along the axial direction. When the rotor punching sheet rotates, particularly when the rotor punching sheet rotates at a high speed, the stress area of the fourth magnetic steel subjected to centrifugal force can be smaller, the tensile stress in the fourth magnetic steel is reduced, and the service life of the fourth magnetic steel is prolonged.

A second V-shaped structure is formed between the third through hole 131 and the fourth through hole 132, so that the second V-shaped structure can apply acting force to the third magnetic steel and the fourth magnetic steel respectively to reduce the influence of centrifugal force on the third magnetic steel and the fourth magnetic steel, enhance the structural strength of the rotor punching sheet, avoid the possibility of breakage of the second magnetic groove 130, and prolong the service life of the rotor punching sheet.

The third through hole 131 and the fourth through hole 132 are located between the first through hole 111 and the second through hole 112 along the circumferential direction of the punching sheet body 100, and the second V-shaped structure is located in the opening of the first V-shaped structure. The projection of the third through hole 131 in the width direction of the third through hole 131 is located in the first through hole 111, and the projection of the fourth through hole 132 in the width direction of the fourth through hole 132 is located in the second through hole 112. Like this, when the rotor punching is when rotating, especially the rotor punching is when high-speed rotating, each magnet steel receives centrifugal force's atress area all can be less, has reduced the inside tensile stress of magnet steel, has promoted the life-span of magnet steel.

Furthermore, the second V-shaped structure is positioned in the opening of the first V-shaped structure, so that a magnetic circuit formed by the first magnetic steel and the third magnetic steel can be arranged in an overlapping mode, and a magnetic circuit formed by the second magnetic steel and the fourth magnetic steel can be arranged in an overlapping mode, therefore, 3-order and 5-order harmonics of air gap flux density of the rotor punching sheet are effectively suppressed, iron loss is greatly reduced, sine degree of back electromotive force is greatly improved, reluctance torque is improved, and rare earth of the motor is reduced.

Preferably, returning now to fig. 2, the distance between adjacent first magnetic grooves 110 is greater than the distance between adjacent first and third through

holes

111 and 131. The distance between the first through hole 111 of one first magnetic slot 110 and the second through hole 112 of the other first magnetic slot 110 is greater than the distance between the adjacent first through hole 111 and the third through hole 131.

Particularly, since the opening of the first V-shaped structure faces the outer side of the punching sheet body 100, the opening of the second V-shaped structure faces the outer side of the punching sheet body 100, and the distance between the first outer end 115 of the first through hole 111 of one first magnetic groove 110 and the second outer end 116 of the second through hole 112 of the other first magnetic groove 110 in the circumferential direction of the punching sheet body 100 is greater than the distance between the adjacent first through hole 111 and the adjacent third through hole 131, the distance between the adjacent first magnetic grooves 110 can be greater than the distance between the adjacent first through hole 111 and the adjacent third through hole 131. Therefore, the magnetic conductivity of the rotor punching sheet is good, and the magnetic resistance is small.

According to the rotor punching sheet of the utility model, a plurality of first magnetic grooves 110 are arranged along the circumferential direction of the punching sheet body 100 at intervals, a plurality of second magnetic grooves 130 are arranged along the circumferential direction of the punching sheet body 100 at intervals, the first magnetic grooves 110 comprise a first through hole 111 and a second through hole 112, a first V-shaped structure is formed between the first through hole 111 and the second through hole 112, the second magnetic grooves 130 comprise a third through hole 131 and a fourth through hole 132, a second V-shaped structure is formed between the third through hole 131 and the fourth through hole 132, the third through hole 131 and the fourth through hole 132 are arranged between the first through hole 111 and the second through hole 112 along the circumferential direction, so that the stress area of the magnetic steel respectively inserted into the plurality of through holes and subjected to centrifugal force is smaller, the tensile stress in the magnetic steel is reduced, the service life of the magnetic steel is prolonged, the harmonic wave of the air gap magnetic density of the rotor punching sheet can be effectively inhibited, the iron loss is greatly reduced, the sine degree of the counter electromotive force is, the reluctance torque is improved, and rare earth reduction of the motor is realized.

Further, in order to ensure that the plurality of magnetic steels and the rotor punching sheet can stably rotate, the included angle between the first through hole 111 and the second through hole 112 is larger than the included angle between the third through hole 131 and the fourth through hole 132, so that the second V-shaped structure can be completely located in the opening of the first V-shaped structure. For example, an included angle between the first through hole 111 and the second through hole 112 may be 89 degrees, and an included angle between the third through hole 131 and the fourth through hole 132 may be 83 degrees, so as to ensure the stability of the rotation of the plurality of magnetic steels and the rotor punching sheet.

As shown in fig. 3, a magnetism isolating hole 150 is further disposed between the first inner end of the first through hole 111 and the second inner end of the second through hole 112, and a cross-sectional shape of the magnetism isolating hole 150 may be substantially rectangular on a plane perpendicular to the axial direction of the punching sheet body 100. Because the magnetic permeability of air is lower, and the magnetic resistance is great, therefore the inductance of q axle is big, and the inductance of b axle is little, and the ratio between q axle and the b axle is great, and then makes the constant power scope of motor big.

A first connecting section 117 is arranged between the first inner end 113 and the magnetism isolating hole 150, a second connecting section 118 is arranged between the second inner end 114 and the magnetism isolating hole 150, and the first connecting section 117 is parallel to the second connecting section 118. In this way, the first connecting section 117 can form a first magnetic bridge, and the second connecting section 118 can form a second magnetic bridge, so that the structural strength can be enhanced, and the sine of the air gap flux density can be improved.

Further, a third connecting section 137 is arranged between the third through hole 131 and the fourth through hole 132, and the third connecting section 137 is located on the outer side of the magnetism isolating hole 150 along the radial direction of the punching sheet body 100. The third connecting segment 137 forms a third magnetic bridge. In the radial direction of the punching sheet body 100, the center line of the third connecting section 137 along the circumferential direction of the punching sheet body 100 coincides with the center line of the magnetism isolating hole 150. The third connecting section 137 may be parallel to the first connecting section 117 and the second connecting section 118. Therefore, the structural strength of the rotor punching sheet is enhanced, the rotor core is firmer in rotation, and the weak magnetic speed expansion capability is enhanced.

Further, the first magnetic groove 110 and the second magnetic groove 130 each include an outer end, and as described above, the first through hole 111 includes a first outer end 115, and the first outer end 115 abuts against the outer end of the first magnetic steel to apply a centripetal force to the first magnetic steel. The second through hole 112 includes a second outer end 116, and the second outer end 116 abuts against the outer end of the second magnetic steel to apply a centripetal force to the second magnetic steel. The third through hole 131 includes a third outer end 135, and the third outer end 135 abuts against an outer end of the third magnetic steel to apply a centripetal force to the third magnetic steel. The fourth through hole 132 includes a fourth outer end 136, and the fourth outer end 136 abuts against the outer end of the fourth magnetic steel to apply a centripetal force to the fourth magnetic steel. The first outer end 115 of the first through hole 111, the second outer end 116 of the second through hole 112, the third outer end 135 of the third through hole 131, and the fourth outer end 136 of the fourth through hole 132 are flush with each other in the circumferential direction of the punch body 100. Thus, the stability of the rotation of the rotor punching sheet is ensured.

Optionally, the edge of the punching sheet body 100 is further provided with a groove, and the groove is recessed inwards from the edge of the punching sheet body 100. The punching sheet body 100 can be provided with a first groove 138 and a second groove 139, the projection of the first groove 138 along the radial direction of the punching sheet body 100 is located in the third through hole 131, and the projection of the second groove 139 along the radial direction of the punching sheet body 100 is located in the fourth through hole 132. Also, the first and

second grooves

138 and 139 may be symmetrically arranged about a center line of the third connection segment 137. Therefore, the sine of the air gap flux density is improved, and the torque of the tooth socket is reduced.

Further, in order to disperse the centrifugal force applied to each magnetic steel, the first magnetic groove 110 further includes a hole wall and a protrusion, and the protrusion can abut against the magnetic steel to ensure the connection strength between the magnetic steel and the magnetic groove. Specifically, the first through hole 111 of the first magnetic groove 110 includes a first hole wall 119 and a first protrusion 120, the first protrusion 120 protrudes from the first hole wall 119 toward the second magnetic groove 130 (the third through hole 131), and the first protrusion 120 can be engaged with the outer end of the first magnetic steel to ensure the connection strength between the first magnetic steel and the first through hole 111, so as to disperse the centrifugal force applied to the first magnetic steel. The first through hole 111 may include two first protrusions 120, and the two first protrusions 120 are respectively located at opposite sides of the first through hole 111 along a length direction of the first through hole 111, so that an inner end and an outer end of the first magnetic steel are respectively engaged with the two first protrusions 120.

Of course, the second through hole 112 may also include a hole wall and a protrusion protruding from the hole wall toward the second magnetic slot 130 (fourth through hole 132), so that the inner end and the outer end of the second magnetic steel are respectively engaged with the two protrusions of the second through hole 112, thereby dispersing the centrifugal force applied to the second magnetic steel.

The second magnetic groove 130 may also include a hole wall and a protrusion, and the protrusion can abut against the magnetic steel to ensure the connection strength between the magnetic steel and the second magnetic groove 130. Specifically, the third through hole 131 of the second magnetic groove 130 includes a second hole wall 140 and a second protrusion 141, the second protrusion 141 protrudes from the second hole wall 140 toward a direction away from the first magnetic groove 110 (the first through hole 111), and the second protrusion 141 can be engaged with an outer end of the third magnetic steel, so as to ensure a connection strength between the third magnetic steel and the third through hole 131, and further disperse a centrifugal force applied to the third magnetic steel. The third through hole 131 may include two second protrusions 141, and the two second protrusions 141 are respectively located at opposite sides of the third through hole 131 along a length direction of the third through hole 131, so that an inner end and an outer end of the third magnetic steel are respectively engaged with the two second protrusions 141.

Of course, the fourth through hole 132 may also include a hole wall and a protruding portion protruding from the hole wall toward a direction away from the first magnetic slot 110 (the second through hole 112), so that the inner end and the outer end of the fourth magnetic steel are respectively engaged with the two protruding portions of the fourth through hole 132, thereby dispersing the centrifugal force applied to the fourth magnetic steel.

As shown in fig. 2 and 4, the rotor sheet further includes a plurality of lightening holes 151, and the plurality of lightening holes 151 are all disposed on the sheet body 100, so as to reduce the weight of the rotor sheet and save the material cost of the rotor sheet. Specifically, on a plane perpendicular to the axial direction of the punching sheet body 100, the cross-sectional shape of the lightening hole 151 may be T-shaped to reduce the centrifugal force generated by the rotor punching sheet when rotating at high speed. The plurality of lightening holes 151 may be arranged at intervals along the circumferential direction of the rotor sheet to ensure that the rotor core is convenient to cool when the rotor core rotates at a high speed. Preferably, in the embodiment shown in fig. 2, 8 lightening holes 151 are provided on the punching sheet body 100, and of course, the number of the lightening holes 151 may be changed according to practical situations, for example, may be 6 or 10, and is not limited herein.

Further, in the circumferential direction of the punch sheet body 100, the lightening holes 151 may be arranged in a staggered manner with the first magnetic slots 110. After the plurality of rotor sheets are stacked in the axial direction to form the rotor core, the lightening holes 151 of each rotor sheet correspond to each other, so that a plurality of ventilation holes parallel to the rotating shaft are formed. The rotor core rotates around the circumferential direction of the rotor punching sheet, so that the rotor core is convenient to cool, and the stable work of the motor is ensured.

Further, the rotor punching sheet further comprises a plurality of positioning holes 152, and the plurality of positioning holes 152 are arranged on the punching sheet body 100. On a plane perpendicular to the axial direction of the punching sheet body, the cross-sectional shape of the positioning hole 152 is circular. Preferably, a plurality of positioning holes 152 are arranged at intervals along the circumferential direction of the punching sheet body 100, and the positioning holes 152 are located outside the lightening holes 151 along the radial direction of the punching sheet body 100, and the positioning holes 152 may be located between the first through hole 111 of one first magnetic slot 110 and the second through hole 112 of another first magnetic slot 110 along the circumferential direction of the punching sheet body 100.

Preferably, the positioning hole 152 may be located between the first inner end 113 of the first through hole 111 of one first magnetic slot 110 and the second inner end 114 of the second through hole 112 of another first magnetic slot 110 in the circumferential direction of the punching sheet body 100. Like this, when rotor core cover established in the pivot, the locating pin extends a plurality of locating holes 152 towards piece body 100 to fix a plurality of towards piece bodies 100 together, strengthened rotor core's fastness, make rotor core rotatory more stable and safety.

According to the utility model discloses a rotor punching, rotor punching can stack along axial direction and form rotor core, and rotor core cover is established in the pivot that is arranged in the stator, considers tooth's socket torque and torque ripple's size, can improve reluctance torque, makes the back electromotive force ripples sine promote, guarantees to have the constant power scope of great motor, can satisfy the high-speed moving requirement of motor.

The utility model also provides a motor, the motor includes any kind of rotor punching of the aforesaid.

According to the utility model discloses a motor, motor include the rotor punching. The rotor punching sheet comprises a punching sheet body, a plurality of first magnetic grooves and a plurality of second magnetic grooves are formed in the punching sheet body, magnetic steel can be inserted into the first magnetic grooves and the second magnetic grooves, the stress area of the magnetic steel subjected to centrifugal force is smaller, the tensile stress inside the magnetic steel is reduced, the service life of the magnetic steel is prolonged, the harmonic wave of the air gap flux density of the rotor punching sheet can be effectively inhibited, the iron loss is greatly reduced, the sine degree of counter electromotive force is greatly improved, the reluctance torque is favorably improved, the magnetic circuit is optimized, and the performance of the motor is improved.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "part," "member," and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that many more modifications and variations can be made in accordance with the teachings of the present invention, all of which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The rotor punching sheet is characterized by comprising:

punching a sheet body;

2. The rotor punching sheet according to claim 1, wherein an included angle between the first through hole and the second through hole is larger than an included angle between the third through hole and the fourth through hole.

3. The rotor punching sheet according to claim 1, wherein the first through hole comprises a first inner end, the second through hole comprises a second inner end, and a magnetism isolating hole is arranged between the first inner end and the second inner end.

4. The rotor sheet according to claim 3, wherein a first connecting section is arranged between the first inner end and the magnetism isolating hole, a second connecting section is arranged between the second inner end and the magnetism isolating hole, and the first connecting section is parallel to the second connecting section.

5. The rotor punching sheet according to claim 3, wherein a third connecting section is arranged between the third through hole and the fourth through hole, and in the radial direction of the punching sheet body, the center line of the third connecting section along the circumferential direction coincides with the center line of the magnetism isolating hole.

6. The rotor punching sheet according to claim 1, wherein the first magnetic groove and the second magnetic groove each comprise an outer end, the outer ends of the first magnetic groove and the second magnetic groove are flush along a circumferential direction of the punching sheet body, a groove is arranged at an edge of the punching sheet body, and a projection of the groove along a radial direction of the punching sheet body is located in the third through hole or the fourth through hole.

7. The rotor sheet according to claim 1, wherein the distance between adjacent first magnetic grooves is greater than the distance between adjacent first through holes and adjacent third through holes.

8. The rotor sheet of claim 1, wherein the first magnetic slot comprises a first hole wall and a first protrusion, the first protrusion protruding from the first hole wall in a direction toward the second magnetic slot, and the second magnetic slot comprises a second hole wall and a second protrusion, the second protrusion protruding from the second hole wall in a direction away from the first magnetic slot.

9. The rotor punching sheet according to claim 1, further comprising a plurality of lightening holes, wherein the plurality of lightening holes are all arranged on the punching sheet body, the section of each lightening hole is in a T shape on a plane perpendicular to the axial direction of the punching sheet body, the plurality of lightening holes are arranged at intervals along the circumferential direction, and the lightening holes and the first magnetic grooves are arranged in a staggered manner in the circumferential direction.

10. An electric machine, characterized in that it comprises a rotor sheet according to any one of claims 1-9.