CN214506701U

CN214506701U - Electric automobile driving motor fluting rotor structure

Info

Publication number: CN214506701U
Application number: CN202120911506.3U
Authority: CN
Inventors: 林龙华; 吴红星; 兰维胜
Original assignee: Liuzhou Huashitong Auto Parts Co Ltd
Current assignee: Liuzhou Huashitong Auto Parts Co Ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-10-26
Anticipated expiration: 2031-04-29

Abstract

The utility model discloses an electric automobile driving motor rotor structure of slotting, including rotor core and the axial electric motor rotor axle that runs through this rotor core, the inside circumference equipartition of rotor core has six groups to make up the permanent magnet, and the looks remote site of two adjacent combination permanent magnets is the N utmost point and the S utmost point of this combination permanent magnet respectively, rotor core surface shaping has six rotor grooves, the rotor groove is in rotor core surface distributes along its axial, just the rotor groove is located adjacent two between the combination permanent magnet. Has the advantages that: the upper arc transition with a large radian is adopted outside the rotor groove, so that fifth harmonic and seventh harmonic can be further suppressed, and the bottom arc transition with a small radian is adopted at the bottom of the rotor groove, so that higher harmonic can be further suppressed, thereby greatly suppressing torque fluctuation, cogging torque and back electromotive force harmonic and improving the overall performance of the motor.

Description

Electric automobile driving motor fluting rotor structure

Technical Field

The utility model relates to an electric automobile motor technical field, concretely relates to electric automobile driving motor fluting rotor structure.

Background

The rotor core profile structure of the traditional permanent magnet synchronous motor is a cylindrical structure, permanent magnets are attached to the surface of the rotor core profile structure, the permanent magnets provide an excitation magnetic field for the motor, and the permanent magnets are evenly distributed circumferentially according to N poles and S poles. For a fractional-slot concentrated winding motor with a small number of slots, the motor has large torque fluctuation, cogging torque and counter potential harmonic waves, and a rotor eccentric structure or a permanent magnet-shaped non-uniform thickness structure is usually adopted, so that the structure can reduce or inhibit the torque fluctuation and the cogging torque to a certain extent, reduce the counter potential harmonic amplitude, but also cause poor performance and efficiency of the motor. The applicant has therefore proposed a slotted rotor structure for an electrical machine.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric automobile driving motor fluting rotor structure just in order to solve above-mentioned problem, the utility model provides an among a great deal of technical scheme preferred technical scheme have: the technical effects of reducing torque fluctuation, inhibiting cogging torque of the permanent magnet synchronous motor, reducing back electromotive force harmonic of the permanent magnet synchronous motor, improving overall performance of the motor and the like are described in detail below.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a pair of electric automobile driving motor fluting rotor structure, including rotor core and the motor rotor axle that runs through the rotor core axial, the inside circumference equipartition of rotor core has six groups of combination permanent magnet, and the relative end of two adjacent combination permanent magnets is the N utmost point and the S utmost point of this combination permanent magnet respectively, rotor core surface shaping has six rotor grooves, the rotor groove is in rotor core surface along its axial distribution, and the rotor groove is located between two adjacent combination permanent magnet;

each group of combined permanent magnets consists of a linear permanent magnet and a V-shaped permanent magnet;

fifth and seventh harmonic suppression structures are formed on the rotor slots, and higher harmonic suppression structures for suppressing higher than the seventh harmonic are formed on the rotor slots.

Preferably, the rotor groove is a rectangular groove, and the depth of the rectangular groove is the same as the depth of the side, close to the motor rotor shaft, of the linear permanent magnet.

Preferably, the V-shaped permanent magnet is of a V-shaped structure consisting of a first V-shaped permanent magnet part and a second V-shaped permanent magnet part which are symmetrically arranged, an opening faces to the center of the first-shaped permanent magnet, and the first V-shaped permanent magnet part is not connected with the near end of the second V-shaped permanent magnet part; and the first V-shaped permanent magnet part and the second V-shaped permanent magnet part are both positioned between the linear permanent magnet and the motor rotor shaft.

Preferably, the two ends of the linear permanent magnet are respectively provided with a first magnetic isolation bridge, the two ends of one part of the V-shaped permanent magnet are respectively provided with a third magnetic isolation bridge, the two ends of the other part of the V-shaped permanent magnet are respectively provided with a second magnetic isolation bridge, and the end faces of the second magnetic isolation bridge and the third magnetic isolation bridge at the opening of the V-shaped permanent magnet are planes.

Preferably, the bottom surface of the rotor slot is a lower bottom, and the plane of the lower bottom is parallel to the end surfaces of the second magnetic isolation bridge and the third magnetic isolation bridge which are positioned at the opening of the V-shaped permanent magnet.

Preferably, the fifth and seventh harmonic suppression structures are formed on an upper arc of the opening edge of the rotor slot, the higher harmonic suppression structure is formed on a bottom arc of the bottom edge of the rotor slot, and the radian of the upper arc is greater than that of the bottom arc.

Preferably, the position of the rotor core corresponding to the inner side of the upper arc is a magnetic isolation bridge saturation area.

To sum up, the utility model has the advantages that: by forming the rotor slot on the surface of the rotor core along the axial direction, a magnetic circuit formed by the linear permanent magnet and the V-shaped permanent magnet in the rotor core is changed, and the third harmonic and the fifth harmonic of a rotor rotating magnetic field are inhibited, so that the counter potential waveform formed in the rotor core after the rotor core rotates is closer to sine; meanwhile, the upper arc transition with a large radian is adopted outside the rotor groove, fifth harmonic and seventh harmonic can be further suppressed, and the bottom arc transition with a small radian is adopted at the bottom of the rotor groove, so that higher harmonic can be further suppressed, thereby greatly suppressing torque fluctuation, cogging torque and back electromotive force harmonic and improving the overall performance of the motor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

fig. 3 is an enlarged schematic view of a portion B in fig. 1.

The reference numerals are explained below:

1. a rotor core; 2. a V-shaped permanent magnet part; 3. a linear permanent magnet; 4. a V-shaped permanent magnet part II; 5. a rotor slot; 6. a motor rotor shaft; 7. a first magnetic isolation bridge; 8. upward arc; 9. a bottom arc; 10. a lower bottom; 11. a third magnetic isolation bridge; 12. a fourth magnetic isolation bridge; 13. and a magnetic isolation bridge saturation region.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, the utility model provides an electric automobile driving motor fluting rotor structure, including rotor core 1 and the motor rotor axle 6 that runs through this rotor core 1 axial, the inside circumference equipartition of rotor core 1 has six groups of combination permanent magnet, and the relative end of two adjacent combination permanent magnets is the N utmost point and the S utmost point of this combination permanent magnet respectively, rotor core 1 surface shaping has six rotor grooves 5, rotor groove 5 is in rotor core 1 surface along its axial distribution, and rotor groove 5 is located between two adjacent combination permanent magnet, rotor groove 5 is the rectangular channel, and this rectangular channel degree of depth is unanimous with the degree of depth that a style of calligraphy permanent magnet 3 is close to motor rotor axle 6 one side;

each group of combined permanent magnets consists of a linear permanent magnet 3 and a V-shaped permanent magnet, the V-shaped permanent magnet is of a V-shaped structure consisting of a first V-shaped permanent magnet part 2 and a second V-shaped permanent magnet part 4 which are symmetrically arranged, an opening faces to the center of the linear permanent magnet 3, and the close ends of the first V-shaped permanent magnet part 2 and the second V-shaped permanent magnet part 4 are not connected; the first V-shaped permanent magnet part 2 and the second V-shaped permanent magnet part 4 are both positioned between the linear permanent magnet 3 and the motor rotor shaft 6;

fifth and seventh harmonic suppression structures are formed on the rotor slots 5, and higher harmonic suppression structures for suppressing higher than seventh harmonic are formed on the rotor slots 5; the fifth and seventh harmonic suppression structures are upper arcs 8 formed on the opening edge of the rotor slot 5, the higher harmonic suppression structure is bottom arcs 9 formed on the bottom edge of the rotor slot 5, and the radian of the upper arcs 8 is larger than that of the bottom arcs 9; and a magnetic isolation bridge saturation area 13 is arranged at the inner side of the rotor core 1 corresponding to the upper arc 8.

The working principle is that a permanent magnet is embedded in a rotor of the permanent magnet synchronous motor and provides an excitation magnetic field for the motor, the amplitude and the phase of the magnetic field correspond to the magnitude and the amplitude of winding current, the rotation of the magnetic field forms winding back electromotive force, and the phase of the amplitude of the back electromotive force is the same as the phase of the winding current. Therefore, the sine degree of counter potential formed by the rotation of the rotor permanent magnet directly influences the performance of the motor; by forming the rotor slot 5 on the surface of the rotor core 1 along the axial direction, a magnetic circuit formed by the linear permanent magnet 3 and the V-shaped permanent magnet in the rotor core 1 is changed, and the third harmonic and the fifth harmonic of a rotor rotating magnetic field are inhibited, so that the counter potential waveform formed in the rotor core 1 after the rotor core 1 rotates is closer to sine; meanwhile, the upper arc 8 with a large radian is adopted for transition outside the rotor groove 5, so that fifth harmonic and seventh harmonic can be further suppressed, and the bottom arc 9 with a small radian is adopted for transition at the bottom of the rotor groove 5, so that higher harmonic can be further suppressed, thereby greatly suppressing torque fluctuation, cogging torque and back electromotive force harmonic and improving the overall performance of the motor.

As an optional implementation manner, two ends of the linear permanent magnet 3 are respectively provided with a first magnetic isolation bridge 7, two ends of the first V-shaped permanent magnet part 2 are respectively provided with a third magnetic isolation bridge 11, two ends of the second V-shaped permanent magnet part 4 are respectively provided with a second magnetic isolation bridge, and end faces of the second magnetic isolation bridge and the third magnetic isolation bridge 11 located at the opening of the V-shaped permanent magnet are both planes;

the bottom surface of the rotor slot 5 is a lower bottom 10, and the plane of the lower bottom 10 is parallel to the end surfaces of a second magnetic isolation bridge and a third magnetic isolation bridge 11 which are positioned at the opening of the V-shaped permanent magnet.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The slotting rotor structure of the driving motor of the electric automobile is characterized by comprising a rotor core (1) and a motor rotor shaft (6) which penetrates through the rotor core (1) in the axial direction, six groups of combined permanent magnets are uniformly distributed in the circumferential direction in the rotor core (1), opposite ends of two adjacent combined permanent magnets are respectively an N pole and an S pole of the combined permanent magnets, six rotor grooves (5) are formed in the surface of the rotor core (1), the rotor grooves (5) are distributed on the surface of the rotor core (1) along the axial direction of the rotor core, and the rotor grooves (5) are positioned between two adjacent combined permanent magnets;

each group of combined permanent magnets consists of a linear permanent magnet (3) and a V-shaped permanent magnet;

fifth and seventh harmonic suppression structures are formed on the rotor slots (5), and higher harmonic suppression structures for suppressing higher than the seventh harmonic are formed on the rotor slots (5).

2. The slotted rotor structure of the driving motor of the electric automobile according to claim 1, characterized in that: the rotor groove (5) is a rectangular groove, and the depth of the rectangular groove is consistent with the depth of one side, close to the motor rotor shaft (6), of the linear permanent magnet (3).

3. The slotted rotor structure of the driving motor of the electric automobile according to claim 1, characterized in that: the V-shaped permanent magnet is of a V-shaped structure consisting of a first V-shaped permanent magnet part (2) and a second V-shaped permanent magnet part (4) which are symmetrically arranged, an opening faces to the center of the first V-shaped permanent magnet (3), and the close ends of the first V-shaped permanent magnet part (2) and the second V-shaped permanent magnet part (4) are not connected; and the first V-shaped permanent magnet part (2) and the second V-shaped permanent magnet part (4) are both positioned between the linear permanent magnet (3) and the motor rotor shaft (6).

4. The slotted rotor structure of the driving motor of the electric automobile according to claim 3, characterized in that: the both ends of a style of calligraphy permanent magnet (3) are provided with first magnetism bridge (7) that separates respectively, the both ends of a V font permanent magnet (2) are provided with third magnetism bridge (11) that separates respectively, the both ends of a V font permanent magnet two (4) are provided with the second respectively and separate the magnetism bridge, are located the second of V font permanent magnet opening part separates magnetism bridge and third magnetism bridge (11) terminal surface and is the plane.

5. The grooved rotor structure of the electric automobile driving motor according to claim 4, characterized in that: the bottom surface of the rotor slot (5) is a lower bottom (10), and the plane of the lower bottom (10) is parallel to the end surfaces of a second magnetic isolation bridge and a third magnetic isolation bridge (11) which are positioned at the opening of the V-shaped permanent magnet.

6. The slotted rotor structure of the driving motor of the electric automobile according to claim 1, characterized in that: the fifth harmonic suppression structure and the seventh harmonic suppression structure are formed on an upper arc (8) at the edge of an opening of the rotor slot (5), the higher harmonic suppression structure is formed on a bottom arc (9) at the edge of the bottom of the rotor slot (5), and the radian of the upper arc (8) is larger than that of the bottom arc (9).

7. The slotted rotor structure of the driving motor of the electric automobile according to claim 6, characterized in that: and the inner side of the rotor core (1) corresponding to the upper arc (8) is provided with a magnetic isolation bridge saturation area (13).