CN113315283A

CN113315283A - Rotor, motor and automobile

Info

Publication number: CN113315283A
Application number: CN202110584751.2A
Authority: CN
Inventors: 黄浩涛; 李龙彪; 贾金信; 黄忠雄; 郭长光; 汪汉新
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2021-08-27

Abstract

The invention provides a rotor, a motor and an automobile, wherein the rotor comprises a rotor core, the rotor core is provided with a plurality of magnetic poles arranged at intervals along the circumferential direction of the rotor core, the rotor core is provided with a first magnetic steel groove, a second magnetic steel groove and a third magnetic steel groove under the same magnetic pole, the first magnetic steel groove is of a first V-shaped structure which is symmetrical about a first radial line of the rotor core, the second magnetic steel groove and the third magnetic steel groove are symmetrical about the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure face the radial outer side of the rotor core, first side magnetic steel and second side magnetic steel which are symmetrical about the first radial line are arranged in the first magnetic steel groove, the end part of the first side magnetic steel, which is close to the second side magnetic steel, is clamped to form a first air groove, and the end part of the second magnetic steel groove, which is close to the third magnetic steel groove, forms a first magnetic isolation bridge. According to the invention, the output torque of the motor is improved, and the torque ripple and the harmonic content are reduced.

Description

Rotor, motor and automobile

Technical Field

The invention belongs to the technical field of motor design, and particularly relates to a rotor, a motor and an automobile.

Background

With the increasing importance of people on environmental protection and efficient energy utilization, the trend of automobiles under the eyes becomes a common industrial consensus, the electric surge of automobiles is increasingly disturbed, and the driving motor is used as a key ring for energy conversion of new energy automobiles, so that the new energy automobiles are greatly influenced. The permanent magnet synchronous motor has the advantages of large torque density, high efficiency, good stability, high reliability and the like, so that the permanent magnet synchronous motor is widely applied to the field of pure electric or hybrid new energy automobiles.

When a permanent magnet synchronous motor is developed, the output torque of the motor and the NVH (Noise, Vibration, Harshness) problem caused by the torque ripple and harmonic content to the motor need to be considered, and in addition, the mechanical strength of the motor also needs to be considered, so that the reliability and the safety of the motor are ensured.

Disclosure of Invention

Accordingly, the present invention provides a rotor, a motor, and an automobile, which can improve the output torque of the motor and reduce the torque ripple and the harmonic content.

In order to solve the above problems, the present invention provides a rotor including a rotor core having a plurality of magnetic poles arranged at intervals in a circumferential direction thereof, under the same magnetic pole, the rotor iron core is provided with a first magnetic steel groove, a second magnetic steel groove and a third magnetic steel groove, wherein the first magnet steel slot is a first V-shaped structure symmetrical about a first radial line of the rotor core, the second magnetic steel groove and the third magnetic steel groove are symmetrical about the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure face to the radial outer side of the rotor core, the first magnetic steel groove is internally provided with a first side magnetic steel and a second side magnetic steel which are symmetrical about the first radial line, the end parts of the first side magnetic steel and the second side magnetic steel which are close to each other are clamped to form a first air groove, and the end parts of the second magnetic steel groove and the third magnetic steel groove which are close to each other form a first magnetic isolation bridge.

In some embodiments, a second magnetic isolation bridge is formed between the radially outer end of one side of the first magnetic steel groove and the outer circumferential wall of the rotor core, a third magnetic isolation bridge is formed between the radially outer end of the other side of the first magnetic steel groove and the outer circumferential wall of the rotor core, the radial width of the second magnetic isolation bridge and/or the third magnetic isolation bridge is L, and L is greater than or equal to 1mm and less than or equal to 1.1 mm.

In some embodiments, the first magnetic steel groove has a first groove wall and a second groove wall which are located at the radial outer side of the rotor core and intersect in a V shape, and further has a third groove wall and a fourth groove wall which are located at the radial inner side of the rotor core and intersect in a V shape, and the intersection of the first groove wall and the second groove wall and/or the intersection of the third groove wall and the fourth groove wall are rounded.

In some embodiments, the first slot wall and the third slot wall are arranged in parallel and spaced apart by a distance d, the first magnetic steel slot further has a fifth slot wall and a sixth slot wall, the fifth slot wall is located at a radially outer side of the third slot wall to position a radially inner end of the first side magnetic steel, a radial thickness of the first side magnetic steel is n, and q is (0.64-0.66) × n.

In some embodiments, q is 0.645 n; and/or the radial thickness of the second side magnetic steel is equal to that of the first side magnetic steel.

In some embodiments, the first magnetic steel groove further comprises a seventh groove wall located radially outside the fifth groove wall, and an eighth groove wall located radially outside the sixth groove wall, wherein an included angle formed between the seventh groove wall and the eighth groove wall is c, and c is greater than or equal to 30 degrees and less than or equal to 35 degrees.

In some embodiments, c is 32 °.

In some embodiments, a second magnetic steel is installed in the second magnetic steel groove, a third magnetic steel is installed in the third magnetic steel groove, the radial thickness of the second magnetic steel is m, and n is m × 0.425.

In some embodiments, 7.2mm ≦ m ≦ 7.5 mm; and/or the radial thickness of the third magnetic steel is equal to that of the second magnetic steel.

In some embodiments, the first side magnetic steel has a first side surface close to the outer circle of the rotor, the second side magnetic steel has a second side surface close to the outer circle of the rotor, the first side surface and the second side surface are arranged opposite to each other to form a first V-shape, the second magnetic steel slot has a first inner slot wall, the third magnetic steel slot has a second inner slot wall symmetrical to the first inner magnetic steel slot with respect to the first radial line, an extension line of the first inner slot wall and a first radial edge extension line adjacent to the first magnetism isolating bridge form a first intersection point, an extension line of the second inner slot wall and a second radial edge extension line adjacent to the first magnetism isolating bridge form a second intersection point, a connection line of the first intersection point and the second intersection point is a first connection line, and a radial distance between a sharp angle of the first V-shape and a midpoint of the first connection line is h, h is (m + n) ((2-2.5)).

In some embodiments, h ═ 2.25 (m + n); and/or the opening angle of the first V-shaped is a, and a is more than or equal to 110 degrees and less than or equal to 115 degrees.

In some embodiments, the second V-shape has an opening angle b, b ═ a- (5 ° to 8 °); and/or, a ═ 112 °.

In some embodiments, a connection point of the first inner slot wall and the first magnetism isolating bridge is a first circular arc, a radius of the first circular arc is ri, and a circumferential width of the first magnetism isolating bridge is w, where ri is (1.2-1.3) × w.

The invention further provides a motor which comprises a motor rotor, wherein the motor rotor is the rotor.

The invention further provides an automobile which comprises the driving motor.

According to the rotor, the motor and the automobile, provided by the invention, on the premise of ensuring that the torque ripple and the harmonic content are small, the magnetic leakage at the first magnetic steel slot is reduced, and the permanent magnet torque and the reluctance torque are increased, so that the output torque of the motor is further improved.

Drawings

FIG. 1 is a schematic axial projection of a rotor according to an embodiment of the present invention;

FIG. 2 is a partial structural view of the magnetic pole of FIG. 1, with the various component structures shown primarily;

FIG. 3 is a partial structural view of the magnetic pole of FIG. 1, with various relevant dimensions shown primarily therein;

fig. 4 is a partial structural view of a magnetic pole of fig. 1, showing mainly other relevant dimensions.

The reference numerals are represented as:

1. a rotor core; 11. a first magnetic steel slot; 111. a first slot wall; 112. a second slot wall; 113. a third tank wall; 114. a fourth slot wall; 115. a fifth slot wall; 116. a sixth slot wall; 117. a seventh slot wall; 118. an eighth cell wall; 12. a second magnetic steel slot; 121. a first inner slot wall; 13. a third magnetic steel groove; 131. a second inner slot wall; 21. a first side magnetic steel; 22. second side magnetic steel; 23. a second magnetic steel; 24. a third magnetic steel; 31. a first air tank; 41. a first magnetic isolation bridge; 42. a second magnetic isolation bridge; 43. and a third magnetic isolation bridge.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, a rotor is provided, which includes a rotor core 1, the rotor core 1 has a plurality of magnetic poles arranged at intervals along a circumferential direction thereof, and under a same magnetic pole, the rotor core 1 has a first magnetic steel slot 11, a second magnetic steel slot 12, and a third magnetic steel slot 13, where the first magnetic steel slot 11 is a first V-shaped structure symmetric with respect to a first radial line of the rotor core 1, the second magnetic steel slot 12 and the third magnetic steel slot 13 are symmetric with respect to the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure both face a radial outer side of the rotor core 1, the first magnetic steel slot 11 is provided with a first side magnetic steel 21 and a second side magnetic steel 22 symmetric with respect to the first radial line, an end of the first side magnetic steel 21 and an end of the second side magnetic steel 22 are clamped to form a first air slot 31, the end parts of the second magnetic steel grooves 12 close to the third magnetic steel grooves 13 form a first magnetic isolation bridge 41. In the technical scheme, the first magnetic steel groove 11 is used as an outer ring V-shaped magnetic steel groove, the second magnetic steel groove 12 and the third magnetic steel groove 13 are used as an inner ring V-shaped magnetic steel groove together, wherein the outer ring V-shaped magnetic steel groove forms the first air groove 31 at the first radial line, and the inner ring V-shaped magnetic steel groove corresponding to the first air groove 31 is provided with the first magnetic isolation bridge 41. Specifically, as shown in the following table, it is verified that the outer ring V-shaped magnetic steel slot has a larger output torque with an air slot, a similar torque ripple and a similar harmonic content, and specifically, the maximum output torques with the air slot (the present invention) and the magnetic isolation bridge (related art) are 1834.2 and 1806.6, the torque ripple is 2.3% and 2.28%, and the harmonic content is 1.12% and 1.13%, respectively, while keeping other parameters consistent.

And the first magnetic isolation bridge 41 in the inner V-shaped magnetic steel slot is located at the inner side of the first air slot 31, so that the structural strength of the rotor core 1 can be ensured on the premise of ensuring low magnetic leakage, and the damage phenomenon possibly generated by the structure of the rotor core 1 during high-speed rotation can be effectively prevented.

In some embodiments, a second magnetic isolation bridge 42 is formed between the radially outer end of one side of the first magnetic steel slot 11 and the outer circumferential wall of the rotor core 1, a third magnetic isolation bridge 43 is formed between the radially outer end of the other side of the first magnetic steel slot 11 and the outer circumferential wall of the rotor core 1, the radial width of the second magnetic isolation bridge 42 and/or the third magnetic isolation bridge 43 is L, and L is greater than or equal to 1mm and less than or equal to 1.1 mm. The widths of the second magnetic isolation bridge 42 and the third magnetic isolation bridge 43 can reduce magnetic leakage, increase the permanent magnet torque of the motor and improve the output capacity of the motor on the premise of ensuring the mechanical strength of the rotor.

In some embodiments, the first magnetic steel slot 11 has a first slot wall 111 and a second slot wall 112 that are located radially outside the rotor core 1 and intersect in a V shape, and further has a third slot wall 113 and a fourth slot wall 114 that are located radially inside the rotor core 1 and intersect in a V shape, where an intersection of the first slot wall 111 and the second slot wall 112 and/or an intersection of the third slot wall 113 and the fourth slot wall 114 is rounded, that is, an intersection of the first slot wall 111 and the second slot wall 112 and an intersection of the third slot wall 113 and the fourth slot wall 114 respectively have circular arcs, but the non-straight edges intersect, so that stress concentration can be reduced, and mechanical strength of the rotor core can be improved.

In some embodiments, the first slot wall 111 and the third slot wall 113 are arranged in parallel and spaced apart from each other by a distance d, the first magnetic steel slot 11 further has a fifth slot wall 115 and a sixth slot wall 116, the fifth slot wall 115 is located at a radially outer side of the third slot wall 113 to position a radially inner end of the first side magnetic steel 21, a radial thickness of the first side magnetic steel 21 is n, q is (0.64-0.66) × n; the radial thickness of the second side magnetic steel 22 is equal to the radial thickness of the first side magnetic steel 21, specifically, the sixth groove wall 116 is located at the radial outer side of the fourth groove wall 114 to position the radial inner end of the second side magnetic steel 22, the radial thickness of the second side magnetic steel 22 is n, and q is 0.64 to 0.66 × n, preferably 0.645 × n. The purpose of restricting q is to make q have a proper relatively large value on the premise of ensuring that the first side magnetic steel 21 and the second side magnetic steel 22 can be fixed, so as to prevent the air gap at the corresponding position from becoming small due to an excessively small q value, thereby increasing the leakage flux of the part (namely, the first air slot 31) in the middle of the first magnetic steel slot and reducing the output capacity of the motor.

In some embodiments, the first magnetic steel slot 11 further includes a seventh slot wall 117 radially outside the fifth slot wall 115, an eighth slot wall 118 radially outside the sixth slot wall 116, and an included angle formed between the seventh slot wall 117 and the eighth slot wall 118 is c, 30 ° ≦ c ≦ 35 °, that is, the V-shaped outer opening angle of the first magnetic steel slot 11 is c, preferably, c ≦ 32 °. The increase of included angle c can lead to the interval between the circumference both ends of first magnetic steel groove 11 and adjacent second magnetic steel groove 12 or third magnetic steel groove 13 diminishes, and then leads to the magnetic density increase in the adjacent region, and magnetic resistance increase, magnetic density are inhomogeneous, lead to output torque to diminish, torque pulsation increase, harmonic content increase, and the undersize of included angle c can make the second separates magnetic bridge 42, the circumference width of third and separate magnetic bridge 43 is too little, leads to the magnetic leakage to increase.

In some embodiments, a second magnetic steel 23 is installed in the second magnetic steel groove 12, a third magnetic steel 24 is installed in the third magnetic steel groove 13, and the radial thickness of the second magnetic steel 23 is m, and n is m × 0.425. In a particular embodiment, 7.2mm ≦ m ≦ 7.5mm, and most preferably, m ≦ 7.3 mm. According to the technical scheme, the magnitude relation between m and n is limited, so that the torque pulsation and the harmonic content can be reduced on the premise of ensuring the output torque. In some embodiments, the radial thickness of the third magnetic steel 24 is equal to the radial thickness of the second magnetic steel 23.

In some embodiments, the first side magnetic steel 21 has a first side surface close to the outer circle of the rotor, the second side magnetic steel 22 has a second side surface close to the outer circle of the rotor, the first side surface and the second side surface are disposed opposite to each other to form a first V-shape, the second magnetic steel slot 12 has a first inner slot wall 121, the third magnetic steel slot 13 has a second inner slot wall 131 symmetrical to the first inner magnetic steel slot 12 about the first radial line, an extension line of the first inner slot wall 121 and a first radial edge extension line adjacent to the first magnetic bridge 41 form a first intersection point, an extension line of the second inner slot wall 131 and a second radial edge extension line adjacent to the first magnetic bridge 41 form a second intersection point, a connection line of the first intersection point and the second intersection point is a first connection line, and a radial distance between a sharp corner of the first V-shape and a midpoint of the first connection line is h, specifically, as shown in fig. 4, the sharp angle of the first V-shape is K, the midpoint of the first connecting line is J, the distance between J and K is h, the minimum radial distance between the point J and the hole wall of the rotating shaft hole of the rotor core is O2, and on the premise that the minimum radial distance between the point K and the hole wall of the rotating shaft hole is constant (i.e., constant), the larger the value of O2 is, the smaller the value of h is, and the influence of the value of O2 on the output torque of the motor is studied (as shown in the following table), it is found that, as the value of O2 increases, h decreases and the output torque of the motor gradually increases, but at the same time, when h is too small, other structures (the first magnetic bridge 41, and the output torque of the motor increases, and the output torque of the motor can be further increased The second magnetic steel groove 12 and the third magnetic steel groove 13) are selected to be optimal in comprehensive consideration of the distribution and shape.

In some embodiments, the first V has an opening angle a of 110 ° ≦ a ≦ 115 °, and most preferably, a ≦ 112 °, and the second V has an opening angle b, b ≦ a- (5 ° to 8 °). The opening angles a and b can improve the output torque of the motor, reduce the torque pulsation of the motor, reduce the harmonic content of the motor, reduce the vibration of the motor, reduce the noise of the motor and improve the performance of the motor.

In some embodiments, a connection point of the first inner slot wall 121 and the first magnetic isolation bridge 41 is a first circular arc, a radius of the first circular arc is ri, and a circumferential width of the first magnetic isolation bridge 41 is w, (1.2-1.3) × w, and in some embodiments, ri ═ 1.25 × w. The first inner slot wall and the first magnetic isolation bridge 41 are connected by using a first arc, and the radius of the first arc is related to the circumferential width of the first magnetic isolation bridge 41, so that the mechanical strength of the first magnetic isolation bridge 41 can be increased. The unit of the opening angles a, b, and c is defined as "in", and the unit of the lengths is defined as "in mm".

The invention provides a rotor topological structure with low harmonic and low torque pulsation through the design of a magnetic steel slot, the design of a magnetic isolation bridge and the design of a rotor magnetic pole of a motor rotor, and provides constraint on the key size of the rotor topological structure.

According to an embodiment of the present invention, there is also provided a motor, including a motor rotor, where the motor rotor is the above-mentioned rotor.

According to an embodiment of the invention, an automobile is also provided, which includes a driving motor, and the driving motor is the 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 present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection 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, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a rotor, includes rotor core (1), have a plurality of magnetic poles that set up along its circumference interval on rotor core (1), its characterized in that, under same magnetic pole, rotor core (1) is gone up and has first magnetism steel slot (11), second magnetism steel slot (12), third magnetism steel slot (13), wherein first magnetism steel slot (11) be for about the first V-arrangement structure of the first radial line symmetry of rotor core (1), second magnetism steel slot (12) with third magnetism steel slot (13) about first radial line symmetry just forms second V-arrangement structure, first V-arrangement structure with second V-arrangement structure all towards the radial outside of rotor core (1), first magnetism steel slot (11) establish about first side magnet steel (21), the second side magnet steel (22) of first radial line symmetry, first side magnet steel (21) with the tip clamp of second side magnet steel (22) is established and is formed first sky and is close And the end parts of the second magnetic steel groove (12) and the third magnetic steel groove (13) close to each other form a first magnetic isolation bridge (41).

2. The rotor according to claim 1, characterized in that a second magnetic isolation bridge (42) is formed between the radial outer end of one side of the first magnetic steel slot (11) and the outer circumferential wall of the rotor core (1), a third magnetic isolation bridge (43) is formed between the radial outer end of the other side of the first magnetic steel slot (11) and the outer circumferential wall of the rotor core (1), the radial width of the second magnetic isolation bridge (42) and/or the third magnetic isolation bridge (43) is L, and L is more than or equal to 1mm and less than or equal to 1.1 mm.

3. The rotor as recited in claim 1, characterized in that the first magnet steel slot (11) has a first slot wall (111) and a second slot wall (112) radially outside the rotor core (1) and intersecting in a V-shape, and further has a third slot wall (113) and a fourth slot wall (114) radially inside the rotor core (1) and intersecting in a V-shape, wherein the intersection of the first slot wall (111) and the second slot wall (112) and/or the intersection of the third slot wall (113) and the fourth slot wall (114) is filleted.

4. The rotor as recited in claim 3, characterized in that the first slot wall (111) and the third slot wall (113) are arranged in parallel and spaced apart by a distance d, the first magnetic steel slot (11) further has a fifth slot wall (115) and a sixth slot wall (116), the fifth slot wall (115) is located radially outside the third slot wall (113) to position a radially inner end of the first side magnetic steel (21), and the first side magnetic steel (21) has a radial thickness n, q (0.64-0.66) × n.

5. The rotor of claim 4, wherein q is 0.645 n; and/or the radial thickness of the second side magnetic steel (22) is equal to that of the first side magnetic steel (21).

6. The rotor as recited in claim 4, characterized in that the first magnet steel slot (11) further comprises a seventh slot wall (117) radially outside the fifth slot wall (115), an eighth slot wall (118) radially outside the sixth slot wall (116), the seventh slot wall (117) and the eighth slot wall (118) forming an angle c, 30 ° ≦ c ≦ 35 °.

7. A rotor according to claim 6, wherein c is 32 °.

8. The rotor according to claim 4, characterized in that a second magnetic steel (23) is arranged in the second magnetic steel slot (12), a third magnetic steel (24) is arranged in the third magnetic steel slot (13), and the radial thickness of the second magnetic steel (23) is m, and n is m 0.425.

9. The rotor as set forth in claim 8, wherein m is 7.2mm ≦ m ≦ 7.5 mm; and/or the radial thickness of the third magnetic steel (24) is equal to that of the second magnetic steel (23).

10. The rotor according to claim 8, characterized in that the first side magnetic steel (21) has a first side surface close to the outer circle of the rotor, the second side magnetic steel (22) has a second side surface close to the outer circle of the rotor, the first side surface and the second side surface are arranged opposite to each other to form a first V-shape, the second magnetic steel slot (12) has a first inner slot wall (121), the third magnetic steel slot (13) has a second inner slot wall (131) symmetrical to the first inner magnetic steel slot (12) with respect to the first radial line, the extension line of the first inner slot wall (121) and the first radial extension line adjacent to the first magnetism isolating bridge (41) form a first intersection point, the extension line of the second inner slot wall (131) and the second radial extension line adjacent to the first magnetism isolating bridge (41) form a second intersection point, and the connection line of the first intersection point and the second intersection point is a first connection line, and the radial distance between the sharp corner of the first V-shaped and the midpoint of the first connecting line is h, and h is (m + n) × (2-2.5).

11. The rotor of claim 10, wherein h ═ 2.25 (m + n) ×; and/or the opening angle of the first V-shaped is a, and a is more than or equal to 110 degrees and less than or equal to 115 degrees.

12. The rotor of claim 11 wherein the second V-shape has an opening angle b, b ═ a- (5 ° to 8 °); and/or, a ═ 112 °.

13. The rotor as recited in claim 10, characterized in that the junction of the first inner slot wall (121) and the first flux barrier bridge (41) is a first circular arc having a radius ri, and the first flux barrier bridge (41) has a circumferential width w, ri ═ 1.2 to 1.3 × w.

14. An electrical machine comprising a machine rotor, characterized in that the machine rotor is a rotor according to any one of claims 1 to 13.

15. A motor vehicle comprising a drive motor, characterized in that the drive motor is an electric motor according to claim 14.