CN219760733U - Rotor punching sheet, motor rotor and motor - Google Patents

Abstract

The utility model provides a rotor punching sheet, a motor rotor and a motor, wherein the rotor punching sheet comprises a punching sheet body, a first permanent magnet and a second permanent magnet, the punching sheet body is provided with a shaft hole, a first mounting groove and a second mounting groove, a plurality of first mounting grooves and a plurality of second mounting grooves are arranged at intervals around the shaft hole, the second mounting grooves are positioned at the sides of the first mounting grooves facing the shaft hole, each first mounting groove is parallel to a corresponding second mounting groove, two adjacent first mounting grooves extend along the same straight line, the first permanent magnets are embedded in the first mounting grooves in a one-to-one correspondence manner, and the second permanent magnets are embedded in the second mounting grooves in a one-to-one correspondence manner. Under the condition that the inner diameter of the rotor punching sheet is required to be large enough and the outer diameter of the rotor punching sheet is limited, more first permanent magnets and more second permanent magnets can be arranged in a limited space, and the magnetic flux on the rotor punching sheet is increased on the premise that the size of the rotor punching sheet is not increased.

Description

Rotor punching sheet, motor rotor and motor

Technical Field

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

Background

Motors are widely used in a variety of industries, for example in the automotive industry, where they act as actuators in the drive train of a hybrid vehicle to power the vehicle. At present, a scheme of directly connecting a motor and an engine is generally adopted in a hybrid power system in the market so as to meet the arrangement mode of multi-power coupling of the hybrid power system.

However, the arrangement described above requires the placement of other components in the motor rotor, such as clutches, reduction gears, etc., limiting the size of the rotor cavity. Meanwhile, the size design of the front cabin of the hybrid power system is considered, the outer diameter size of the stator is limited, so that the outer ring size of the rotor is limited, the space for installing the permanent magnets on the rotor is small, the magnetic flux on the rotor is insufficient, and the motor can not provide power meeting the vehicle-mounted torque.

Disclosure of Invention

The utility model solves the problem of how to increase the magnetic flux on the rotor without increasing the size of the rotor.

In order to solve the problems, the utility model provides a rotor punching sheet, which comprises a punching sheet body, a first permanent magnet and a second permanent magnet, wherein the punching sheet body is provided with a shaft hole, a first mounting groove and a second mounting groove, a plurality of first mounting grooves and a plurality of second mounting grooves are arranged around the shaft hole at intervals, the second mounting grooves are positioned at the sides of the first mounting grooves facing the shaft hole, each first mounting groove is parallel to a corresponding second mounting groove, two adjacent first mounting grooves extend along the same straight line, a plurality of first permanent magnets are embedded in the first mounting grooves in a one-to-one correspondence manner, and a plurality of second permanent magnets are embedded in the second mounting grooves in a one-to-one correspondence manner.

The utility model has the technical effects that: the first mounting grooves and the second mounting grooves are arranged at intervals around the shaft hole, namely, the first mounting grooves and the second mounting grooves are arranged at intervals along the circumferential direction of the punching body, the first mounting grooves and the opposite second mounting grooves are arranged in parallel, the two adjacent first mounting grooves extend along the same straight line, the two adjacent second mounting grooves extend along the same straight line, the first permanent magnets can be embedded in the first mounting grooves in a one-to-one correspondence manner, the second permanent magnets can be embedded in the second mounting grooves in a one-to-one correspondence manner, the distance between the opposite first mounting grooves and the second mounting grooves is small, the first mounting grooves and the second mounting grooves are arranged along the circumferential direction of the punching body, so that the inner diameter requirement of the rotor punching is large enough, that is, the radial size of the shaft hole is required to be large enough, and under the condition that the outer diameter of the rotor punching is limited, more first permanent magnets and second permanent magnets can be arranged in a limited space, and the magnetic flux of the rotor punching sheet is increased on the premise that the size of the rotor punching sheet is not increased.

Preferably, the first mounting groove and the second mounting groove are both straight-line grooves, the structure of the first permanent magnet and the structure of the second permanent magnet are both straight-line structures, and the first mounting groove and the second mounting groove are both tangential to the circumferential direction of the punching body.

Preferably, two adjacent first mounting grooves and two adjacent second mounting grooves form a magnetic pole mounting area, the length of the first mounting groove is smaller than that of the second mounting groove, and an empty groove structure is arranged between the two adjacent magnetic pole mounting areas.

Preferably, in the magnetic pole installation area, a first reinforcing rib is arranged between the two first installation grooves, a second reinforcing rib is arranged between the two second installation grooves, and the first reinforcing rib and the second reinforcing rib are arranged along the radial extension of the punching sheet body.

Preferably, in the magnetic pole installation area, two ends of the first installation grooves, which are close to each other, are respectively provided with a first magnetism isolating groove, two ends of the first installation grooves, which are far away from each other, are respectively provided with a second magnetism isolating groove, the first magnetism isolating grooves and the second magnetism isolating grooves are communicated with the first installation grooves, the first magnetism isolating grooves are arranged along the radial extension of the punching sheet body, and the second magnetism isolating grooves are arranged along the circumferential extension of the punching sheet body.

Preferably, in the magnetic pole installation area, one ends of the two second installation grooves, which are close to each other, are respectively provided with a third magnetism isolating groove, one ends of the two second installation grooves, which are far away from each other, are respectively provided with a fourth magnetism isolating groove, the third magnetism isolating grooves and the fourth magnetism isolating grooves are communicated with the second installation grooves, the third magnetism isolating grooves are located at the sides of the second installation grooves facing the shaft hole, and the fourth magnetism isolating grooves are located at the sides of the second installation grooves facing away from the shaft hole.

Preferably, the peripheral edge of the punching body is provided with auxiliary grooves, and a plurality of auxiliary grooves are arranged at intervals along the circumferential direction of the punching body.

The utility model also provides a motor rotor which comprises the rotor punching sheet, wherein a plurality of rotor punching sheets are stacked, and the rotor punching sheets are staggered and integrally molded along the circumferential direction of the rotor punching sheet.

The motor rotor has the same beneficial effects as the rotor punching sheet, and the description is omitted here.

Preferably, the motor rotor includes six rotor punching sheets stacked and arranged, and the six rotor punching sheets are staggered by a preset angle in a circumferential direction of the rotor punching sheets, and the preset angle ranges from 0 ° or more to 3 ° or less.

The utility model also provides an electric machine comprising a motor rotor as described above.

The motor has the same beneficial effects as the rotor punching sheet, and the description is omitted here.

Drawings

FIG. 1 is a schematic view of a rotor sheet according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a magnetic pole mounting region according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a first permanent magnet and a second permanent magnet according to an embodiment of the present utility model mounted in a magnetic pole mounting area;

fig. 4 is a schematic structural diagram of a motor rotor according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a punching body; 11. a shaft hole; 12. a first mounting groove; 13. a second mounting groove; 14. a void structure; 15. a first reinforcing rib; 16. a second reinforcing rib; 17. a first magnetism isolating slot; 18. a second magnetism isolating slot; 19. a third magnetism isolating slot; 20. a fourth magnetism isolating slot; 21. a first magnetically isolated bridge; 22. a second magnetically isolated bridge; 23. an auxiliary groove; 2. a first permanent magnet; 3. and a second permanent magnet.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

Referring to fig. 1 to 3, in an embodiment of the present utility model, a rotor punching sheet includes a punching sheet body 1, a first permanent magnet 2 and a second permanent magnet 3, where the punching sheet body 1 is provided with a shaft hole 11, a first mounting groove 12 and a second mounting groove 13, a plurality of the first mounting grooves 12 and a plurality of the second mounting grooves 13 are all disposed around the shaft hole 11 at intervals, and the second mounting grooves 13 are located at sides of the first mounting grooves 12 facing the shaft hole 11, each first mounting groove 12 is disposed parallel to a corresponding one of the second mounting grooves 13, two adjacent first mounting grooves 12 extend along the same straight line, a plurality of the first permanent magnets 2 are embedded in the first mounting grooves 12 in a one-to-one correspondence manner, and a plurality of the second permanent magnets 3 are embedded in the second mounting grooves 13 in a one-to-one correspondence manner.

Specifically, the rotor sheet may include a sheet body 1, a first permanent magnet 2, and a second permanent magnet 3, and the intermediate region of the sheet body 1 may be provided with a shaft hole 11, and the shaft hole 11 may be used to arrange other components such as a clutch, a reduction gear, and the like, so that the radial dimension of the shaft hole 11 needs to be designed to be large enough, and illustratively, the outer diameter of the sheet body 1 is designed to be 226mm, and the inner diameter of the sheet body 1 is designed to be 182mm, i.e., the radial dimension of the shaft hole 11 is designed to be 182mm. The edge area near the punching body 1 may be provided with a first mounting groove 12 and a second mounting groove 13, and the second mounting groove 13 is located at a side of the first mounting groove 12 toward the shaft hole 11, the plurality of first mounting grooves 12 and the plurality of second mounting grooves 13 are all disposed around the shaft hole 11 at intervals, and an extending direction of the first mounting groove and an extending direction of the second mounting groove are both matched with a circumferential direction of the punching body.

More clearly, the first mounting grooves 12 are oppositely arranged in the circumferential direction of the punching body 1 and enclose a first annular structure, and the second mounting grooves 13 are oppositely arranged in the circumferential direction of the punching body 1 and enclose a second annular structure, wherein the first annular structure is close to the edge of the punching body 1, and the second annular structure is located inside the first annular structure. In this embodiment, each first mounting groove 12 may be disposed parallel to a corresponding one of the second mounting grooves 13, and two adjacent first mounting grooves 12 may be disposed along the same straight line, and two adjacent second mounting grooves 13 may also be disposed along the same straight line.

The dimensions of the first permanent magnet 2 may be matched to the dimensions of the first mounting groove 12 such that the first permanent magnet 2 may be mounted in the first mounting groove 12 and the dimensions of the second permanent magnet 3 may be matched to the dimensions of the second mounting groove 13 such that the second permanent magnet 3 may be mounted in the second mounting groove 13. The distance between the first mounting groove 12 and the second mounting groove 13 which are opposite to each other is made smaller, and the first mounting groove 12 and the second mounting groove 13 are arranged along the circumferential direction of the sheet body 1, so that under the condition that the inner diameter of the rotor sheet is required to be large enough, that is, the radial dimension of the shaft hole 11 is required to be large enough, and the outer diameter of the rotor sheet is restricted, more first permanent magnets 2 and second permanent magnets 3 can be arranged in a limited space, and the magnetic flux on the rotor sheet can be increased on the premise that the dimension of the rotor sheet is not increased.

Referring to fig. 1 to 3, the first mounting groove 12 and the second mounting groove 13 are both in a straight shape, the structure of the first permanent magnet 2 and the structure of the second permanent magnet 3 are both in a straight shape, and the first mounting groove 12 and the second mounting groove 13 are both tangential to the circumferential direction of the punching body 1.

Specifically, the first mounting groove 12 and the second mounting groove 13 may each be a rectangular groove, that is, the first mounting groove 12 and the second mounting groove 13 may be rectangular in shape, and the first mounting groove 12 and the second mounting groove 13 may each be arranged along the circumferential direction of the sheet body 1, the first mounting groove 12 and the opposite second mounting groove 13 may be arranged in parallel, and the first mounting groove 12 may be arranged tangentially to the circumferential direction of the sheet body 1, and the second mounting groove 13 may also be arranged tangentially to the circumferential direction of the sheet body 1, and more first mounting grooves 12 and second mounting grooves 13 may be arranged on the sheet body 1, so that more first permanent magnets 2 and second permanent magnets 3 may be arranged on the sheet body 1, further increasing the magnetic flux on the rotor sheet.

Referring to fig. 1 to 3, in some embodiments, two adjacent first mounting grooves 12 and two adjacent second mounting grooves 13 form a magnetic pole mounting region, the length of the first mounting groove 12 is smaller than the length of the second mounting groove 13, and a void structure 14 is provided between the two adjacent magnetic pole mounting regions.

Specifically, two adjacent first mounting grooves 12 and two adjacent second mounting grooves 13 may constitute one magnetic pole mounting region, a plurality of magnetic pole mounting regions may be disposed at intervals along the circumferential direction of the sheet body 1, and an empty groove structure 14 is provided between two adjacent magnetic pole mounting regions, in this embodiment, the empty groove structure 14 may include two air grooves, which are disposed adjacent to one magnetic pole mounting region, respectively, and which are disposed along the radial extension of the sheet body 1, and the provision of the empty groove structure 14 can significantly improve motor vibration, noise and eddy currents.

Alternatively, the length of the first mounting groove 12 is smaller than the length of the second mounting groove 13.

In this embodiment, the first permanent magnet 2 and the second permanent magnet 3 may be in-line magnetic steel, the width dimension of the first permanent magnet 2 is in the range of greater than or equal to 2mm and less than or equal to 3mm, the length dimension of the first permanent magnet 2 is in the range of greater than or equal to 5mm and less than or equal to 10mm, the width dimension of the second permanent magnet 3 is in the range of greater than or equal to 3mm and less than or equal to 4mm, the length dimension of the second permanent magnet 3 is in the range of greater than or equal to 8mm and less than or equal to 15mm, and the size of the first permanent magnet 2 is smaller than the size of the second permanent magnet 3, so that the manufacturing cost can be reduced.

In addition, the four slots in one pole mounting region together form an isosceles trapezoid-like structure, while between two adjacent pole mounting regions an isosceles triangle-like structure is formed, where the empty slot structure 14 is located, helping to further improve motor vibration, noise and eddy currents.

In this embodiment, the punching body 1 may be provided with 24 magnetic pole mounting areas and 24 empty slot structures 14, each empty slot structure 14 is disposed between two corresponding adjacent magnetic pole mounting areas, each magnetic pole mounting area has four slots, each empty slot structure 14 has two slots, and a 24-pole 144-slot design scheme is formed.

Referring to fig. 2, in some embodiments, in the magnetic pole mounting area, a first reinforcing rib 15 is disposed between the two first mounting grooves 12, a second reinforcing rib 16 is disposed between the two second mounting grooves 13, and the first reinforcing rib 15 and the second reinforcing rib 16 are disposed along a radial extension of the punching body 1.

Specifically, in one magnetic pole installation area, a first reinforcing rib 15 may be disposed between two first installation grooves 12, and the first reinforcing rib 15 may be disposed along the radial extension of the punching sheet body 1, the first reinforcing rib 15 may increase the structural strength of the joint of the two first installation grooves 12, a second reinforcing rib 16 may be disposed between two second installation grooves 13, and the second reinforcing rib 16 may be disposed along the radial extension of the punching sheet body 1, and the second reinforcing rib 16 may increase the structural strength of the joint of the two second installation grooves 13, and may increase the overall strength of the punching sheet body 1 by providing the first reinforcing rib 15 and the second reinforcing rib 16.

In addition, the width of the first reinforcing rib 15 is substantially the same as the width of the second reinforcing rib 16, or the distance between the two first mounting grooves 12 is substantially the same as the distance between the two second mounting grooves 13, that is, the first mounting groove 12 and the second mounting groove 13 on the same side are substantially flush on the side close to the center line, and there is a certain dislocation on the side far from the center line, so that the isosceles trapezoid-like structure can be formed together.

Referring to fig. 2, in some embodiments, in the magnetic pole mounting area, two ends of the first mounting grooves 12, which are close to each other, are respectively provided with a first magnetism isolating groove 17, two ends of the first mounting grooves 12, which are far away from each other, are respectively provided with a second magnetism isolating groove 18, the first magnetism isolating groove 17 and the second magnetism isolating groove 18 are both communicated with the first mounting groove 12, the first magnetism isolating groove 17 is arranged along the radial extension of the punching body 1, and the second magnetism isolating groove 18 is arranged along the circumferential extension of the punching body 1.

Specifically, in one magnetic pole installation area, one end of each first installation groove 12, which is close to each other, may be provided with a first magnetism isolating groove 17, one end of each first installation groove 12, which is far away from each other, may be provided with a second magnetism isolating groove 18, and both the first magnetism isolating groove 17 and the second magnetism isolating groove 18 may be communicated with the first installation groove 12, that is, opposite ends of the first installation groove 12 may be provided with a first magnetism isolating groove 17 and a second magnetism isolating groove 18, respectively, the first magnetism isolating groove 17 may extend along a radial direction of the punching body 1, the second magnetism isolating groove 18 may extend along a circumferential direction of the punching body 1, and when the first permanent magnet 2 is arranged in the first installation groove 12, the first magnetism isolating groove 17 and the second magnetism isolating groove 18 may reduce a leakage magnetic coefficient of the first permanent magnet 2, improve a utilization rate of the first permanent magnet 2, and improve a sine property and torque pulsation of an air gap magnetic field.

In this embodiment, the first permanent magnet 2 may be fixed in the first mounting groove 12 by using an injection molding process, and the first magnetism isolating groove 17 and the second magnetism isolating groove 18 may facilitate pouring of injection molding materials, so that the first permanent magnet 2 and the punching body 1 are fixed more firmly, and further the structural strength of the rotor punching is increased.

Referring to fig. 2, in some embodiments, in the magnetic pole mounting area, a third magnetism isolating slot 19 is respectively disposed at one end of the two second mounting slots 13 close to each other, a fourth magnetism isolating slot 20 is respectively disposed at one end of the two second mounting slots 13 far away from each other, the third magnetism isolating slot 19 and the fourth magnetism isolating slot 20 are both communicated with the second mounting slots 13, the third magnetism isolating slot 19 is located at a side of the second mounting slots 13 facing the shaft hole 11, and the fourth magnetism isolating slot 20 is located at a side of the second mounting slots 13 facing away from the shaft hole 11.

Specifically, in one magnetic pole installation area, one end of the two second installation grooves 13, which are close to each other, may be respectively provided with a third magnetism isolating groove 19, one end of the two second installation grooves 13, which are far away from each other, may be respectively provided with a fourth magnetism isolating groove 20, and both the third magnetism isolating groove 19 and the fourth magnetism isolating groove 20 may be communicated with the second installation grooves 13, that is, opposite ends of the second installation grooves 13 may be respectively provided with the third magnetism isolating groove 19 and the fourth magnetism isolating groove 20, in this embodiment, both the third magnetism isolating groove 19 and the fourth magnetism isolating groove 20 may extend along the radial direction of the punching body 1, and the third magnetism isolating groove 19 is located at a side of the second installation groove 13, which faces away from the shaft hole 11, and the fourth magnetism isolating groove 20 is located at a side of the second installation groove 13, which faces away from the shaft hole 11. When the second permanent magnet 3 is arranged in the second installation groove 13, the third magnetic isolation groove 19 and the fourth magnetic isolation groove 20 can reduce the leakage magnetic coefficient of the second permanent magnet 3, improve the utilization rate of the second permanent magnet 3, and improve the sine property and torque pulsation of the air-gap magnetic field.

Similarly, the second permanent magnet 3 can also be fixed in the second mounting groove 13 by adopting an injection molding process, and the third magnetism isolating groove 19 and the fourth magnetism isolating groove 20 can facilitate pouring injection molding, so that the second permanent magnet 3 and the punching sheet body 1 are fixed more firmly, and further the structural strength of the rotor punching sheet is increased.

Referring to fig. 2, in some embodiments, the first mounting groove 12 and the peripheral edge of the sheet body 1 form a first magnetic isolation bridge 21, the first magnetic isolation bridge 21 extends along the circumferential direction of the sheet body 1, a second magnetic isolation bridge 22 is formed between the second mounting groove 13 and the empty groove structure 14, and the second magnetic isolation bridge 22 extends along the radial direction of the sheet body 1.

Specifically, the first mounting groove 12 and the outer peripheral edge of the sheet body 1 may form a first magnetic shielding bridge 21, and the first magnetic shielding bridge 21 may extend in the circumferential direction of the sheet body 1, and in this embodiment, the width of the first magnetic shielding bridge 21 may be greater than or equal to 0.5mm and less than or equal to 2mm. A second magnetic bridge 22 may be formed between the second mounting groove 13 and the empty groove structure 14, and the second magnetic bridge 22 may extend along the radial direction of the punching body 1, where in this embodiment, the width of the second magnetic bridge 22 may be greater than or equal to 0.5mm and less than or equal to 2mm. By arranging the first magnetic isolation bridge 21 and the second magnetic isolation bridge 22, the leakage magnetic coefficients of the first permanent magnet 2 and the second permanent magnet 3 can be further reduced, the utilization rate of the first permanent magnet 2 and the second permanent magnet 3 is improved, and the sine property and the torque pulsation of the air gap magnetic field are further improved.

Referring to fig. 1 to 3, in some embodiments, the outer peripheral edge of the die body 1 is provided with auxiliary grooves 23, and a plurality of the auxiliary grooves 23 are disposed at intervals along the circumferential direction of the die body 1.

Specifically, the outer peripheral edge of the punching body 1 may be provided with auxiliary grooves 23, and a plurality of auxiliary grooves 23 may be provided at intervals along the circumferential direction of the punching body 1, with each magnetic pole mounting region being located between two adjacent auxiliary grooves 23 in this embodiment. For convenience of description, two adjacent auxiliary grooves 23 are defined as a first auxiliary groove 23 and a second auxiliary groove 23, respectively, and an included angle formed by connection of the shaft center of the shaft hole 11 with the first auxiliary groove 23 and a line connecting the shaft center of the shaft hole 11 with the second auxiliary groove 23 is greater than or equal to 3 ° and less than or equal to 6 °.

Referring to fig. 2, in some embodiments, a third magnetic bridge is disposed between the first mounting groove 12 and the second mounting groove 13, and the third magnetic bridge extends along the circumferential direction of the punching body 1.

Specifically, a third magnetic bridge may be disposed between the first mounting groove 12 and the second mounting groove 13, and may extend in the circumferential direction of the sheet body 1, and in this embodiment, the width of the third magnetic bridge may be greater than or equal to 2mm and less than or equal to 5mm, and preferably the width of the third magnetic bridge is 2.7mm.

In one magnetic pole installation area, a fourth magnetic isolation bridge may be further disposed between the two first installation grooves 12, a fifth magnetic isolation bridge may be further disposed between the two second installation grooves 13, the fourth magnetic isolation bridge and the fifth magnetic isolation bridge may all extend along the radial direction of the punching sheet body 1, and the width of the fourth magnetic isolation bridge may be equal to the width of the fifth magnetic isolation bridge, in this embodiment, the width ranges of the fourth magnetic isolation bridge and the fifth magnetic isolation bridge may be greater than or equal to 0.2mm and less than or equal to 1mm. The leakage magnetic coefficients of the first permanent magnet 2 and the second permanent magnet 3 can be further reduced by arranging the third magnetic isolation bridge, the fourth magnetic isolation bridge and the fifth magnetic isolation bridge, the utilization rate of the first permanent magnet 2 and the second permanent magnet 3 is improved, and the sine property and the torque pulsation of the air gap magnetic field are further improved.

Referring to fig. 1 and 4, a rotor for an electric motor according to another embodiment of the present utility model includes the rotor sheets described above, wherein a plurality of the rotor sheets are stacked, and the plurality of the rotor sheets are staggered and integrally injection-molded along a circumferential direction of the rotor sheets.

Specifically, the motor rotor may include a plurality of rotor punching sheets according to actual situations, and in this embodiment, from NVH (Noise, vibration, harshness-noise, vibration and harshness) and loss analysis of the magnetic steel, the thickness range of the motor rotor may be designed to be greater than or equal to 8mm and less than or equal to 12mm. The plurality of rotor punching sheets can be stacked and placed on the injection molding machine, and the special modulated bonding magnetic powder is poured on the plurality of rotor punching sheets in the stacked arrangement through the empty slot structure 14, the first magnetism isolating slot 17, the second magnetism isolating slot 18, the third magnetism isolating slot 19 and the fourth magnetism isolating slot 20, so that the plurality of rotor punching sheets are molded and encapsulated into a whole, and the integral strength of a motor rotor can be increased.

Preferably, the motor rotor may include 6 rotor punching sheets, the 6 rotor punching sheets may be stacked and integrally formed by adopting an injection molding process, in this embodiment, the 6 rotor punching sheets may be stacked and placed on an injection molding machine, and the specially modulated adhesive magnetic powder is poured on the 6 rotor punching sheets stacked and arranged through the empty slot structure 14, the first magnetic isolation slot 17, the second magnetic isolation slot 18, the third magnetic isolation slot 19 and the fourth magnetic isolation slot 20, so that the 6 rotor punching sheets are injection molded and encapsulated into a whole, and the overall strength of the motor rotor may be increased.

Referring to fig. 1 and 4, in some embodiments, the motor rotor includes six rotor sheets stacked one on another, and the six rotor sheets are staggered from each other by a predetermined angle in a circumferential direction of the rotor sheets, the predetermined angle ranging from 0 ° or more to 3 ° or less.

Specifically, the motor rotor may include six rotor sheets, the six rotor sheets may be stacked, and the plurality of rotor sheets may be disposed to be staggered from each other in a circumferential direction of the motor rotor, and an angle range in which adjacent two rotor sheets are staggered may be greater than or equal to 0 ° and less than or equal to 3 °.

Preferably, the first rotor sheet is offset from the second rotor sheet by 1.5 ° to 2.5 °, the first rotor sheet is offset from the third rotor sheet by 0.5 ° to 1.5 °, the first rotor sheet is disposed directly opposite the fourth rotor sheet, the first rotor sheet is offset from the fifth rotor sheet by 0.5 ° to 1.5 °, and the first rotor sheet is offset from the sixth rotor sheet by 1.5 ° to 2.5 °. The motor rotor has the characteristics of simple structure and convenient processing and manufacturing process.

An electric machine according to another embodiment of the utility model comprises a motor rotor as described above.

Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the disclosure.

Claims (10)

1. The utility model provides a rotor punching sheet, its characterized in that, including punching sheet body (1), first permanent magnet (2) and second permanent magnet (3), punching sheet body (1) is equipped with shaft hole (11), first mounting groove (12) and second mounting groove (13), a plurality of first mounting groove (12) and a plurality of second mounting groove (13) all encircle shaft hole (11) interval sets up, just second mounting groove (13) are located first mounting groove (12) orientation the side of shaft hole (11), every first mounting groove (12) with one of correspondence second mounting groove (13) parallel arrangement, adjacent two first mounting groove (12) extend along same straight line and set up, a plurality of first permanent magnet (2) one-to-one inlays and locates in a plurality of first mounting groove (12), a plurality of second permanent magnet (3) one-to-one inlays and locates in a plurality of second mounting groove (13).

2. Rotor punching sheet according to claim 1, characterized in that the first mounting groove (12) and the second mounting groove (13) are both in a straight groove, the structure of the first permanent magnet (2) and the structure of the second permanent magnet (3) are both in a straight structure, and the first mounting groove (12) and the second mounting groove (13) are both tangentially arranged with the circumferential direction of the punching sheet body (1).

3. Rotor punching according to claim 1, characterized in that two adjacent first mounting slots (12) and two adjacent second mounting slots (13) constitute a pole mounting area, the length of the first mounting slots (12) being smaller than the length of the second mounting slots (13), a void structure (14) being provided between two adjacent pole mounting areas.

4. A rotor punching according to claim 3, characterized in that in the pole mounting area, a first reinforcing rib (15) is provided between the two first mounting grooves (12), a second reinforcing rib (16) is provided between the two second mounting grooves (13), and the first reinforcing rib (15) and the second reinforcing rib (16) are both arranged along the radial extension of the punching body (1).

5. The rotor punching sheet according to claim 4, characterized in that in the magnetic pole mounting area, one ends of the two first mounting grooves (12) close to each other are respectively provided with a first magnetism isolating groove (17), one ends of the two first mounting grooves (12) far away from each other are respectively provided with a second magnetism isolating groove (18), the first magnetism isolating groove (17) and the second magnetism isolating groove (18) are both communicated with the first mounting groove (12), the first magnetism isolating groove (17) is arranged along the radial extension of the punching sheet body (1), and the second magnetism isolating groove (18) is arranged along the circumferential extension of the punching sheet body (1).

6. A rotor punching sheet according to claim 3, characterized in that in the magnetic pole mounting area, one ends of the two second mounting grooves (13) close to each other are respectively provided with a third magnetism isolating groove (19), one ends of the two second mounting grooves (13) far away from each other are respectively provided with a fourth magnetism isolating groove (20), the third magnetism isolating groove (19) and the fourth magnetism isolating groove (20) are communicated with the second mounting groove (13), the third magnetism isolating groove (19) is positioned at the side of the second mounting groove (13) facing the shaft hole (11), and the fourth magnetism isolating groove (20) is positioned at the side of the second mounting groove (13) facing away from the shaft hole (11).

7. Rotor punching sheet according to claim 1, characterized in that the peripheral edge of the punching sheet body (1) is provided with auxiliary grooves (23), a plurality of the auxiliary grooves (23) being arranged at intervals in the circumferential direction of the punching sheet body (1).

8. A motor rotor, characterized by comprising the rotor punching sheet according to any one of claims 1 to 7, wherein a plurality of the rotor punching sheets are laminated, and the plurality of the rotor punching sheets are staggered and integrally injection-molded along the circumferential direction of the rotor punching sheet.

9. The motor rotor as set forth in claim 8, comprising six of said rotor blades arranged in a stack, said six rotor blades being offset from each other in a circumferential direction of said rotor blades by a predetermined angle in a range of 0 ° or more and 3 ° or less.

10. An electric machine comprising a motor rotor according to claim 8 or 9.