CN213367500U

CN213367500U - Rotor punching sheet, rotor core, motor and vehicle

Info

Publication number: CN213367500U
Application number: CN202022025980.4U
Authority: CN
Inventors: 唐志伟; 谭福慧; 高尤坤; 杨晓琴; 张静
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-06-04
Anticipated expiration: 2030-09-16

Abstract

The utility model provides a rotor punching sheet, rotor core, including a motor, an end cap, a controller, and a cover plate, wherein the rotor punching sheet has constructed a plurality of magnet steel grooves including towards the piece body and on it, the magnet steel groove has and is in towards the radial ascending first symmetrical line of piece body, arbitrary two adjacent magnet steel grooves are symmetrical about the second symmetrical line, the contour line towards the piece body that is in between arbitrary two adjacent second symmetrical lines includes the first circular arc section that corresponds with the magnet steel groove, the second circular arc section, the third circular arc section, wherein first circular arc section intersects with first symmetrical line and is symmetrical about first symmetrical line, second circular arc section and third circular arc section branch department first symmetrical line both sides and about first symmetrical line symmetry, the radius of curvature and the centre of curvature of first circular arc section and second circular arc section are different. According to the utility model discloses a rotor punching, rotor core, motor, vehicle can reduce tooth's socket torque and torque ripple under the prerequisite that does not increase the manufacturing degree of difficulty, does not improve material cost.

Description

Rotor punching sheet, rotor core, motor and vehicle

Technical Field

The utility model belongs to the technical field of the motor is made, concretely relates to rotor punching, rotor core, motor, vehicle.

Background

The permanent magnet synchronous motor has the characteristics of high torque density, low manufacturing cost, wide high efficiency region and the like, is the first choice of a driving motor of a new energy automobile such as pure electric, hybrid power, a fuel cell and the like, but because the permanent magnet synchronous motor structurally has tooth grooves, harmonic distortion exists in winding armature reaction, the phenomenon of torque fluctuation exists in the operation of the permanent magnet synchronous motor, the torque fluctuation of the motor is transmitted to the whole power system through a rotor shaft, harmful vibration is generated, the comfort of the surrounding environment can be reduced, the system efficiency is more likely to be reduced, and the service life of parts is shortened. Therefore, in order to ensure the comfort, the vehicle stability and the economy of passengers, the torque fluctuation of the permanent magnet synchronous motor for the new energy automobile needs to be limited in a reasonable range, and a new motor structure is designed as simple and effective as possible on the basis of not increasing the manufacturing difficulty and improving the material cost, so that the aims of reducing harmonic waves, reducing the torque fluctuation and improving the system efficiency on the premise of low cost and convenience in manufacturing are fulfilled.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in providing a rotor punching, rotor core, motor, vehicle, through optimizing rotor punching outline side cut, can reduce tooth's socket torque and torque ripple under the prerequisite that does not increase the manufacturing degree of difficulty, does not improve material cost.

In order to solve the above problems, the present invention provides a rotor punching sheet, including a punching sheet body, a plurality of magnetic steel grooves are constructed on the punching sheet body, the magnetic steel grooves have a first symmetry line in the radial direction of the punching sheet body, any two adjacent magnetic steel grooves are symmetrical with respect to a second symmetry line in the radial direction of the punching sheet body, a contour line of the punching sheet body between any two adjacent second symmetry lines includes a first arc section, a second arc section and a third arc section corresponding to the magnetic steel grooves, wherein the first arc section intersects with the first symmetry line and is symmetrical with respect to the first symmetry line, the second arc section and the third arc section are respectively located at two sides of the first symmetry line and are symmetrical with respect to the first symmetry line, one end of the first arc section is connected with the second arc section through a first transition section, and the other end of the first arc section is connected with the third arc section through a second transition section, the first transition section and the second transition section are symmetrical about the first symmetry line, and the curvature radius and the curvature center of the first circular arc section and the second circular arc section are different.

Optionally, the curvature radius of the second arc segment is a second radius R, the second radius R is equal to the outer circle radius of the stamped sheet body, and the curvature center of the second arc segment coincides with the outer circle center of the stamped sheet body; the curvature center of the first circular arc section is the intersection point of a circle defined by the excircle center and the first radius R and the first symmetrical line, and R is less than R.

Optionally, R ═ 0.44R.

Optionally, the central angle corresponding to the second circular arc segment is δ/2, and δ is greater than or equal to 2.9 ° and less than or equal to 3.1 °.

Optionally, a central angle corresponding to the first arc segment is w, and w is greater than or equal to 10 δ and less than or equal to 12 δ.

Optionally, the first transition section and the second transition section are both straight line sections; and/or a first magnetic isolation bridge is formed between any two adjacent magnetic steel grooves, the width of the first magnetic isolation bridge in the circumferential direction of the stamped sheet body is c, and c is more than or equal to 0.5mm and less than or equal to 1 mm.

Optionally, a second magnetic isolation bridge is formed between the end of the magnetic steel slot and a second arc segment corresponding to the end of the magnetic steel slot, the second magnetic isolation bridge has a thickness d in the radial direction of the stamped sheet body 1, and d is greater than or equal to 0.5mm and less than or equal to 1.2 mm; and/or the V-shaped included angle of any one of the magnetic steel grooves is theta, and theta is more than or equal to 90 degrees and less than or equal to 120 degrees.

The utility model also provides a rotor core, including a plurality of pressure-superposed fashioned rotor punching, the rotor punching is foretell rotor punching.

The utility model also provides a motor, including foretell rotor core.

The utility model also provides a vehicle, including the main motor that drives, the main motor that drives is foretell motor.

The utility model provides a pair of rotor punching, rotor core, motor, vehicle, second circular arc section, third circular arc section, first changeover portion, second changeover portion specifically form through trimming the mode on the basis of former outline through the counterpunch piece body, and pass through the position of magnet steel groove is confirmed the concrete position that sets up of first circular arc section, second circular arc section, third circular arc section reaches the purpose that improves motor air gap shape, under the prerequisite that does not increase the manufacturing degree of difficulty, does not improve manufacturing cost, makes the motor air gap that constitutes by this punching piece body 1 more sinusoidal, effectively weakens the harmonic, reduces the tooth's socket torque, and then reduces motor torque fluctuation, and the lift system efficiency reduces motor vibration, promotes the device that uses it such as the travelling comfort of vehicle.

Drawings

Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the present invention (projected on any radial plane of the rotor sheet);

FIG. 2 is an enlarged partial schematic view of FIG. 1;

fig. 3 is a schematic perspective view of a rotor core according to another embodiment of the present invention;

fig. 4 is a diagram of torque fluctuation comparison data after the motor (not performing the trimming process) of the technical scheme of the present invention is simulated.

The reference numerals are represented as:

1. punching a sheet body; 11. a magnetic steel groove; 111. a first arc segment; 112. a second arc segment; 113. a third arc segment; 114. a first transition section; 115. a second transition section; 12. a first magnetic isolation bridge; 13. a second magnetic isolation bridge; 14. lightening holes; 15. a shaft hole; 2. and a permanent magnet.

Detailed Description

With reference to fig. 1 to 4, according to an embodiment of the present invention, a rotor punching sheet is provided, which includes a punching sheet body 1, a plurality of magnetic steel slots 11 configured on the punching sheet body 1 for embedding permanent magnets 2, the magnetic steel slots 11 having a first line of symmetry in a radial direction of the punching sheet body 1, any two adjacent magnetic steel slots 11 being symmetrical with respect to a second line of symmetry in the radial direction of the punching sheet body 1, a contour line of the punching sheet body 1 between any two adjacent second lines of symmetry including a first circular arc segment 111, a second circular arc segment 112, and a third circular arc segment 113 corresponding to the magnetic steel slots 11, wherein the first circular arc segment 111 intersects with the first line of symmetry and is symmetrical with respect to the first line of symmetry, the second circular arc segment 112 and the third circular arc segment 113 are located on two sides of the first line of symmetry and are symmetrical with respect to the first line of symmetry, one end of the first arc segment 111 is connected with the second arc segment 112 through a first transition segment 114, the other end of the first arc segment 111 is connected with the third arc segment 113 through a second transition segment 115, the first transition segment 114 is symmetrical with the second transition segment 115 about the first symmetrical line, and the curvature radius and the curvature center of the first arc segment 111 are different from those of the second arc segment 112. In the technical scheme, the second arc segment 112, the third arc segment 113, the first transition segment 114 and the second transition segment 115 are formed by trimming the punching sheet body on the basis of the original outline (excircle), and the specific arrangement positions of the first arc segment 111, the second arc segment 112 and the third arc segment 113 are determined according to the position of the magnetic steel slot 11, so that the purpose of improving the shape of a motor air gap (stator and rotor air gap) is achieved, the motor air gap formed by the punching sheet body 1 is more sinusoidal on the premise of not increasing the manufacturing difficulty and the material cost, the harmonic wave is effectively weakened, the cogging torque is reduced, the motor torque fluctuation is further reduced, the system efficiency is improved, the motor vibration is reduced, and the comfort of a device such as a vehicle applying the punching sheet body is improved.

In some embodiments, the curvature radius of the second circular arc segment 112 is a second radius R, the second radius R is equal to the outer circle radius of the stamped sheet body 1, and the curvature center of the second circular arc segment 112 coincides with the outer circle center of the stamped sheet body 1; the curvature center of the first circular arc section 111 is the intersection point of a circle defined by the excircle center and the first radius R and the first symmetry line, and R is less than R, preferably, R is 0.44R, the second circular arc section corresponds to a central angle delta/2, delta is more than or equal to 2.9 degrees and less than or equal to 3.1 degrees, preferably, the first circular arc section corresponds to a central angle w, and w is more than or equal to 10 delta and less than or equal to 12 delta. Here, by limiting the central angle and radius of the first arc segment 111, the second arc segment 112, and the third arc segment 113, the cogging torque of the motor to which the above-described motor is applied can be reduced and the torque ripple can be reduced.

In some embodiments, the first transition section 114 and the second transition section 115 are straight line sections, so as to further simplify the manufacturing process of the rotor sheet.

In order to reduce magnetic leakage and increase the utilization rate of a permanent magnet, in some embodiments, a first magnetic isolation bridge 12 is formed between any two adjacent magnetic steel slots 11, the width of the first magnetic isolation bridge 12 in the circumferential direction of the stamped sheet body 1 is c, and c is greater than or equal to 0.5mm and less than or equal to 1 mm; a second magnetic isolation bridge 13 is formed between the end of any magnetic steel slot 11 and a second arc section 112 corresponding to the end, and the radial thickness of the second magnetic isolation bridge 13 on the punching sheet body 1 is d, wherein d is more than or equal to 0.5mm and less than or equal to 1.2 mm; any one of the magnetic steel grooves 11 has a V-shaped included angle theta which is larger than or equal to 90 degrees and smaller than or equal to 120 degrees.

Specifically, as shown in fig. 1, a shaft hole 15 used for being connected with a rotating shaft in a matched mode is further formed in the punching sheet body 1, the magnetic steel grooves 11 are in a V shape and are multiple, the magnetic steel grooves 11 are arranged along the punching sheet body 1 at even intervals in the circumferential direction, a pair of permanent magnets 2 are placed in each magnetic steel groove 11 to form a magnetic pole, an 8-pole magnetic steel embedded rotor is further formed, the magnetic steel grooves 11 can increase q-axis inductance, salient pole ratio is further increased, and weak magnetic capacity of the motor is improved.

The punching sheet body 1 is also provided with a plurality of lightening holes 14, the lightening holes 14 are arranged at the V-shaped bottom of the V-shaped magnetic steel slot 11, a q-axis magnetic circuit and an air gap flux density waveform can be effectively improved, and cogging torque and torque fluctuation are reduced on the basis of increasing the salient pole rate.

In order to verify the technical scheme of the utility model discloses an actual effect, the utility model discloses the people has carried out corresponding simulation test to it and has carried out the emulation contrast with the motor that does not adopt this technical scheme, can know by fig. 4, the torque fluctuation of this motor is by (not cut edge) 1.2268 (peak-to-peak value)/10.0927 (virtual value) ═ 12.155%, reduce to (cut edge) 0.5047 (peak-to-peak value)/9.8363 (virtual value) ═ 5.13%, it is visible at every utmost point permanent magnet groove angle, separate magnetic groove distance, cut edge size under suitable parameter cooperation, the torque fluctuation of motor obviously reduces, played important performance optimization to the product in actual production.

According to the utility model discloses a concrete embodiment still provides a rotor core, including a plurality of pressure-superposed fashioned rotor punching, the rotor punching is foretell rotor punching.

According to the utility model discloses a concrete embodiment still provides a motor, including foretell rotor core.

According to the utility model discloses a concrete embodiment still provides a vehicle, including the main motor that drives, the main motor that drives is foretell motor.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The rotor punching sheet is characterized by comprising a punching sheet body (1), wherein a plurality of magnetic steel grooves (11) are constructed on the punching sheet body (1), the magnetic steel grooves (11) are provided with a first symmetrical line in the radial direction of the punching sheet body (1), any two adjacent magnetic steel grooves (11) are symmetrical about a second symmetrical line in the radial direction of the punching sheet body (1), a contour line of the punching sheet body (1) between any two adjacent second symmetrical lines comprises a first circular arc section (111), a second circular arc section (112) and a third circular arc section (113) which correspond to the magnetic steel grooves (11), wherein the first circular arc section (111) is intersected with the first symmetrical line and is symmetrical about the first symmetrical line, the second circular arc section (112) and the third circular arc section (113) are respectively positioned at two sides of the first symmetrical line and are symmetrical about the first symmetrical line, one end of the first circular arc section (111) is connected with the second circular arc section (112) through a first transition section (114), the other end of the first circular arc section (111) is connected with the third circular arc section (113) through a second transition section (115), the first transition section (114) and the second transition section (115) are symmetrical about the first symmetrical line, and the curvature radius and the curvature center of the first circular arc section (111) and the second circular arc section (112) are different.

2. The rotor punching sheet according to claim 1, wherein the curvature radius of the second circular arc segment (112) is a second radius R, the second radius R is equal to the outer circle radius of the punching sheet body (1), and the curvature center of the second circular arc segment (112) is coincident with the outer circle center of the punching sheet body (1); the curvature center of the first circular arc section (111) is the intersection point of a circle defined by the excircle center and a first radius R and the first symmetrical line, and R is less than R.

3. The rotor sheet as recited in claim 2, wherein R is 0.44R.

4. The rotor sheet according to any one of claims 1 to 3, wherein the second circular arc segment corresponds to a central angle δ/2, 2.9 ° ≦ δ ≦ 3.1 °.

5. The rotor punching sheet according to claim 4, wherein a central angle corresponding to the first arc segment is w, and w is greater than or equal to 10 delta and less than or equal to 12 delta.

6. The rotor sheet according to any one of claims 1 to 3, wherein the first transition section (114) and the second transition section (115) are both straight line sections; and/or a first magnetic isolation bridge (12) is formed between any two adjacent magnetic steel grooves (11), the width of the first magnetic isolation bridge (12) in the circumferential direction of the punching sheet body (1) is c, and c is more than or equal to 0.5mm and less than or equal to 1 mm.

7. The rotor punching sheet according to any one of claims 1 to 3, wherein a second magnetism isolating bridge (13) is formed between the groove end of any one magnetic steel groove (11) and a second arc section (112) corresponding to the groove end, the thickness of the second magnetism isolating bridge (13) in the radial direction of the punching sheet body (1) is d, and d is more than or equal to 0.5mm and less than or equal to 1.2 mm; and/or the magnetic steel groove (11) is a V-shaped magnetic steel groove, the V-shaped included angle of the V-shaped magnetic steel groove is theta, and theta is larger than or equal to 90 degrees and smaller than or equal to 120 degrees.

8. A rotor core comprises a plurality of laminated rotor punching sheets, and is characterized in that the rotor punching sheets are the rotor punching sheets in any one of claims 1 to 7.

9. An electric machine comprising a rotor core, wherein the rotor core is the rotor core of claim 8.

10. A vehicle comprising a main drive motor, characterized in that the main drive motor is an electric motor according to claim 9.