CN111786481A - Multilayer rotor magnetic steel structure of permanent magnet motor for high-power-density new energy automobile - Google Patents
Multilayer rotor magnetic steel structure of permanent magnet motor for high-power-density new energy automobile Download PDFInfo
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- CN111786481A CN111786481A CN202010666966.4A CN202010666966A CN111786481A CN 111786481 A CN111786481 A CN 111786481A CN 202010666966 A CN202010666966 A CN 202010666966A CN 111786481 A CN111786481 A CN 111786481A
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- magnetic steel
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- permanent magnet
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
Abstract
The invention discloses a multilayer rotor magnetic steel structure of a permanent magnet motor for a high-power-density new energy automobile, which comprises a rotor core, wherein a plurality of magnetic steel groove groups are arranged on the rotor core at intervals along the circumferential direction, each magnetic steel groove group consists of a first layer of V-shaped magnetic steel groove and a second layer of V-shaped magnetic steel groove, and a first layer of magnetic steel and a second layer of magnetic steel are respectively arranged in the first layer of V-shaped magnetic steel groove and the second layer of V-shaped magnetic steel groove; the first layer of V-shaped magnetic steel grooves are radially symmetrical relative to the rotor core, and the second layer of V-shaped magnetic steel grooves are symmetrically arranged on two sides of the first layer of V-shaped magnetic steel grooves; the V-shaped opening of the first layer of V-shaped magnetic steel groove faces towards the outer ring of the rotor core, and the extending directions of the grooves on the two sides of the first layer of V-shaped magnetic steel groove and the second layer of V-shaped magnetic steel groove are respectively parallel correspondingly. The rotor of the invention has high structural strength, and the permanent magnet motor manufactured by the invention has high power density.
Description
Technical Field
The invention relates to the technical field of permanent magnet motors, in particular to a multi-layer rotor magnetic steel structure of a permanent magnet motor for a high-power-density new energy automobile.
Background
At present, the world is seriously lack of energy sources. The ecological environment is rapidly worsened, the environmental protection problem is increasingly prominent, the development of low-carbon economy is urgent, and new energy automobiles become a newly-developed industry which is most worried in the fields of global energy conservation and environmental protection. The improvement of automobile electrification technology is more concerned by people. The driving motor serving as an engine of a hybrid electric vehicle and a pure electric vehicle becomes a core component directly related to the performance of the new energy vehicle, energy conservation and emission reduction. The permanent magnet synchronous driving motor has high power density, high efficiency, small pulsation torque and wider weak magnetic speed regulation range, and is the best choice for the driving motor of the energy-saving and environment-friendly new energy automobile. In order to better exert the value of the permanent magnet synchronous driving motor, the invention optimizes the structural design of the motor, improves the performance of the permanent magnet synchronous driving motor and promotes the better development of new energy automobiles on the basis of continuously breaking through the bottleneck of permanent magnet material research.
The permanent magnet synchronous driving motor can be divided into a surface type rotor structure and a built-in type rotor structure by the mounting mode of permanent magnet steel on a rotor, and the surface type rotor structure can be divided into a surface-mounted type rotor structure and an embedded type rotor structure. The built-in permanent magnet rotor structure can be divided into a radial rotor structure, a tangential rotor structure and a mixed magnetic circuit structure integrating the radial direction and the tangential direction according to the excitation direction of the permanent magnet steel.
The surface-mounted rotor structure has equal inductance of a d axis and a q axis, the rotor does not have a salient pole effect, so that reluctance torque is not generated, and the permanent magnet steel is easy to demagnetize and limited in weak magnetic capacity because the permanent magnet steel is directly exposed in an air gap magnetic field. In the embedded rotor structure, q-axis inductance is larger than d-axis inductance, and the rotor has a salient pole effect, so that reluctance torque is generated.
The power density of the motor can be effectively improved by utilizing the reluctance torque. The dynamic performance of the embedded structure is improved compared with that of a surface-mounted structure, but the magnetic leakage coefficient and the manufacturing cost are both higher than those of the surface-mounted structure. The permanent magnet steel of the built-in rotor structure is positioned in the rotor, and a pole shoe made of ferromagnetic substances is arranged between the outer surface of the permanent magnet steel and the inner circle of the stator core. The permanent magnet steel is used for protecting the permanent magnet steel in the built-in rotor iron core. The reluctance torque is generated because the rotor magnetic circuit structure has asymmetry. The overload capacity and the power density of the permanent magnet synchronous driving motor are improved, and the 'weak magnetic' speed expansion is easy.
At present, the built-in structure in the row is a straight-line-shaped, V-shaped or triangular structure, the weak magnetic speed regulation range and the torque density can not meet the performance requirements of the permanent magnet motor for a high-power-density automobile, and the built-in multilayer rotor magnetic steel structure is researched aiming at the problem.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a multi-layer rotor magnetic steel structure of a permanent magnet motor for a high-power-density new energy automobile, the rotor structure has high strength, and the permanent magnet motor manufactured by the structure has high power density.
The technical scheme is as follows: in order to achieve the purpose, the multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile comprises a rotor core, wherein a plurality of magnetic steel groove groups are arranged on the rotor core at intervals along the circumferential direction, each magnetic steel groove group consists of a first layer of V-shaped magnetic steel groove and a second layer of V-shaped magnetic steel groove, and the first layer of magnetic steel and the second layer of magnetic steel are respectively placed in the first layer of V-shaped magnetic steel groove and the second layer of V-shaped magnetic steel groove; the first layer of V-shaped magnetic steel grooves are radially symmetrical relative to the rotor core, and the second layer of V-shaped magnetic steel grooves are symmetrically arranged on two sides of the first layer of V-shaped magnetic steel grooves; the V-shaped opening of the first layer of V-shaped magnetic steel groove faces towards the outer ring of the rotor core, and the extending directions of the grooves on the two sides of the first layer of V-shaped magnetic steel groove and the second layer of V-shaped magnetic steel groove are respectively parallel correspondingly.
Further, the included angle between the extending direction of the grooves on the two sides of the first layer of V-shaped magnetic steel grooves and the corresponding central axis is greater than forty degrees and less than fifty degrees.
Furthermore, the first layer of magnetic steel and the second layer of magnetic steel are both slender rectangular magnetic steel, and the rectangular thicknesses of the first layer of magnetic steel and the second layer of magnetic steel are equal.
Furthermore, the first layer of magnetic steel and the second layer of magnetic steel which correspond to each other are close to one end of the circle center of the rotor core and are arranged in the radial direction of the rotor core, and the first layer of magnetic steel and the second layer of magnetic steel which correspond to each other are far away from one end of the circle center of the rotor core and are arranged in the circumferential direction of the rotor core.
Further, a first magnetism isolating groove is integrally formed in the first layer of V-shaped magnetic steel groove, and a first magnetism isolating bridge is arranged at the joint of the first layer of V-shaped magnetic steel groove; a second magnetism isolating groove is integrally formed in the second layer of V-shaped magnetic steel groove, and a second magnetism isolating bridge is arranged at the joint of the second layer of V-shaped magnetic steel groove.
Furthermore, the second magnetism isolating bridges at the joint of the second layer of V-shaped magnetic steel grooves are two, and a hollow groove is formed between the two second magnetism isolating bridges.
Furthermore, two first limiting blocks are arranged in the first layer of V-shaped magnetic steel groove, and the two first limiting blocks are respectively in contact connection with two ends of the first layer of magnetic steel; and two second limiting blocks are arranged in the V-shaped magnetic steel groove of the second layer, and the two second limiting blocks are respectively in contact connection with two ends of the second layer of magnetic steel.
Has the advantages that: the invention discloses a multilayer rotor magnetic steel structure of a permanent magnet motor for a high-power-density new energy automobile, which has the following beneficial effects:
1) the magnetic steel isolation bridge adopts a magnetic steel groove structure similar to a double-V shape, the limiting blocks are additionally arranged in the groove to facilitate the installation of magnetic steel, the magnetic flux leakage can be effectively limited by the magnetic isolation bridge, and the magnetic isolation effect is ensured under the condition of ensuring the mechanical strength of the rotor;
2) the structure of the invention simultaneously considers the output of low-speed constant torque control operation and the weak magnetic speed-expanding performance of a constant power area, improves the reaction inductance and the salient pole rate of a direct-axis armature, increases the weak magnetic capacity and the reluctance torque component, improves the utilization rate of the capacity of a motor and an inverter, and avoids the irreversible demagnetization of a permanent magnet in a rotor;
3) the rotor structure of the invention has enough mechanical strength and can ensure safe operation at the highest rotating speed.
Drawings
FIG. 1 is a schematic view of a rotor core structure;
FIG. 2 is a schematic view of a rotor core structure with magnetic steel;
FIG. 3 is a schematic structural diagram of a magnetic steel slot group;
FIG. 4 is a schematic structural diagram of a magnetic steel slot set with magnetic steel.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile comprises a rotor core 1, wherein the cross section of the rotor core 1 is circular, a plurality of magnetic steel slot groups 2 are arranged on the rotor core 1 at intervals along the circumferential direction, and the magnetic steel slot groups 2 are arranged at equal angles.
The magnetic steel groove group 2 is of a double-V-shaped structure, and the single magnetic steel groove group 2 is composed of a first layer of V-shaped magnetic steel grooves 3 and a second layer of V-shaped magnetic steel grooves 4. First layer magnet steel 5 and second layer magnet steel 6 have been placed respectively in first layer V type magnet steel groove 3 and the second floor V type magnet steel groove 4.
As shown in fig. 4, the two side grooves of the first layer of V-shaped magnetic steel grooves 3 are symmetrical about the central axis, and the central axis of the first layer of V-shaped magnetic steel grooves 3 is along the radial direction of the rotor core 1. The second layer of V-shaped magnetic steel grooves 4 are symmetrically arranged on two sides of the first layer of V-shaped magnetic steel grooves 3. The V-shaped opening of the first layer of V-shaped magnetic steel groove 3 faces towards the outer ring of the rotor core 1, and the extending directions of the grooves at the two sides of the first layer of V-shaped magnetic steel groove 3 and the second layer of V-shaped magnetic steel groove 4 are respectively parallel correspondingly.
Referring to the included angle a marked in fig. 4, the included angle (i.e., the included angle a) between the extending direction of the grooves on both sides of the first layer of V-shaped magnetic steel grooves 3 and the corresponding central axis is greater than forty degrees and less than fifty degrees. Because the extending direction in first layer V type magnet steel groove 3 with the both sides groove of second floor V type magnet steel groove 4 corresponds the parallel respectively, contained angle between second floor V type magnet steel groove 4 and the corresponding axis with first layer V type magnet steel groove 4 is the same.
The first layer of magnetic steel 5 and the second layer of magnetic steel 6 are both slender rectangular magnetic steel, and the rectangular thicknesses of the first layer of magnetic steel 5 and the second layer of magnetic steel 6 are equal.
As shown in fig. 4, one ends of the first layer of magnetic steel 5 and the second layer of magnetic steel 6, which are corresponding to each other, near the center of the rotor core 1 are arranged along the radial direction of the rotor core 1, that is, on the same diameter of the rotor core 1; the first layer of magnetic steel 5 and the second layer of magnetic steel 6 which correspond to each other are far away from one end of the circle center of the rotor core 1 and are arranged along the circumferential direction of the rotor core 1, namely, are positioned on a circle which is concentric with the rotor core 1.
A first magnetism isolating groove 7 is integrally formed in the first layer of V-shaped magnetic steel groove 3, and a first magnetism isolating bridge 8 is arranged at the joint of the first layer of V-shaped magnetic steel groove 3. A second magnetism isolating groove 9 is integrally formed in the second layer of V-shaped magnetic steel groove 4, and a second magnetism isolating bridge 10 is arranged at the joint of the second layer of V-shaped magnetic steel groove 4. The magnetic isolation bridge can effectively reduce leakage magnetic flux, and irreversible repulsion of the permanent magnet in the rotor is avoided, so that the magnetic steel cannot be too low in utilization rate due to too large magnetic flux leakage coefficient.
The second magnetism isolating bridges 10 at the joint of the second layer of V-shaped magnetic steel grooves 4 are two, and a hollow groove 11 is arranged between the second magnetism isolating bridges 10. In general, the smaller the thickness of the magnetic isolation bridge 10 is, the better the magnetic isolation effect is, the thickness of the second magnetic isolation bridge 10 can be reduced by the arrangement of the empty groove 11, and in practical application, the thickness of the magnetic isolation bridge is generally set to be 1 mm.
Two first limiting blocks 12 are arranged in the first layer of V-shaped magnetic steel groove 3, and the first limiting blocks 12 are respectively in contact connection with two ends of the first layer of magnetic steel 5. Two second limiting blocks 13 are arranged in the second layer of V-shaped magnetic steel groove 4, and the second limiting blocks 13 are respectively in contact connection with two ends of the second layer of magnetic steel 6. The first limiting block 12 and the second limiting block 13 are arranged to facilitate installation and positioning of the magnetic steel.
The structure of the invention is applied to a permanent magnet three-phase synchronous motor for a new energy automobile of an enterprise, the motor continuously operates with power of 140Kw, torque of 350N.m, rotation speed of 4200 and 12000r/min and peak power of 180Kw, the weight of the whole machine can be controlled below 80kg, and the product has no equivalent product at home.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. High power density new energy automobile is with permanent magnet motor's multilayer rotor magnet steel structure, its characterized in that: the magnetic steel slot structure comprises a rotor core (1), wherein a plurality of magnetic steel slot groups (2) are arranged on the rotor core (1) at intervals along the circumferential direction, each magnetic steel slot group (2) consists of a first layer of V-shaped magnetic steel slot (3) and a second layer of V-shaped magnetic steel slot (4), and a first layer of magnetic steel (5) and a second layer of magnetic steel (6) are respectively placed in the first layer of V-shaped magnetic steel slot (3) and the second layer of V-shaped magnetic steel slot (4); the first layer of V-shaped magnetic steel grooves (3) are radially symmetrical relative to the rotor core (1), and the second layer of V-shaped magnetic steel grooves (4) are symmetrically arranged on two sides of the first layer of V-shaped magnetic steel grooves (3); the V-shaped opening of the first layer of V-shaped magnetic steel groove (3) faces towards the outer ring of the rotor core (1), and the extending directions of the two side grooves of the first layer of V-shaped magnetic steel groove (3) and the second layer of V-shaped magnetic steel groove (4) are respectively parallel correspondingly.
2. The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile according to claim 1, characterized in that: and the included angle between the extending direction of the grooves at the two sides of the first layer of V-shaped magnetic steel groove (3) and the corresponding central axis is more than forty degrees and less than fifty degrees.
3. The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile according to claim 1, characterized in that: the first layer of magnetic steel (5) and the second layer of magnetic steel (6) are both slender rectangular magnetic steel, and the rectangular thicknesses of the first layer of magnetic steel (5) and the second layer of magnetic steel (6) are equal.
4. The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile according to claim 3, characterized in that: correspond each other first layer magnet steel (5) with second floor magnet steel (6) are close to the one end in the centre of a circle of rotor core (1) is followed the radial arrangement of rotor core (1), correspond each other first layer magnet steel (5) with second floor magnet steel (6) are kept away from the one end in the centre of a circle of rotor core (1) is followed the circumference of rotor core (1) is arranged.
5. The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile according to claim 1, characterized in that: a first magnetism isolating groove (7) is integrally formed in the first layer of V-shaped magnetic steel groove (3), and a first magnetism isolating bridge (8) is arranged at the joint of the first layer of V-shaped magnetic steel groove (3); a second magnetism isolating groove (9) is integrally formed in the second layer of V-shaped magnetic steel groove (4), and a second magnetism isolating bridge (10) is arranged at the joint of the second layer of V-shaped magnetic steel groove (4).
6. The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile according to claim 5, characterized in that: the second magnetism isolating bridges (10) at the joint of the second layer of V-shaped magnetic steel grooves (4) are two, and a hollow groove (11) is arranged between the two second magnetism isolating bridges (10).
7. The multilayer rotor magnetic steel structure of the permanent magnet motor for the high-power-density new energy automobile according to claim 1, characterized in that: two first limiting blocks (12) are arranged in the first layer of V-shaped magnetic steel groove (3), and the two first limiting blocks (12) are respectively contacted with two ends of the first layer of magnetic steel (5); two second limiting blocks (13) are arranged in the second layer of V-shaped magnetic steel groove (4), and the second limiting blocks (13) are respectively in contact connection with two ends of the second layer of magnetic steel (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010666966.4A CN111786481A (en) | 2020-07-13 | 2020-07-13 | Multilayer rotor magnetic steel structure of permanent magnet motor for high-power-density new energy automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010666966.4A CN111786481A (en) | 2020-07-13 | 2020-07-13 | Multilayer rotor magnetic steel structure of permanent magnet motor for high-power-density new energy automobile |
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| CN111786481A true CN111786481A (en) | 2020-10-16 |
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| CN202010666966.4A Pending CN111786481A (en) | 2020-07-13 | 2020-07-13 | Multilayer rotor magnetic steel structure of permanent magnet motor for high-power-density new energy automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953055A (en) * | 2021-01-25 | 2021-06-11 | 中国第一汽车股份有限公司 | Rotor structure, motor and vehicle |
| CN113162270A (en) * | 2020-12-30 | 2021-07-23 | 宁波安信数控技术有限公司 | Rotor structure of built-in permanent magnet motor |
| CN114513069A (en) * | 2021-12-17 | 2022-05-17 | 天津大学 | Permanent magnet starting/power generator double V-shaped rotor for hybrid electric vehicle |
-
2020
- 2020-07-13 CN CN202010666966.4A patent/CN111786481A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162270A (en) * | 2020-12-30 | 2021-07-23 | 宁波安信数控技术有限公司 | Rotor structure of built-in permanent magnet motor |
| CN112953055A (en) * | 2021-01-25 | 2021-06-11 | 中国第一汽车股份有限公司 | Rotor structure, motor and vehicle |
| CN114513069A (en) * | 2021-12-17 | 2022-05-17 | 天津大学 | Permanent magnet starting/power generator double V-shaped rotor for hybrid electric vehicle |
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