CN215870955U

CN215870955U - Motor rotor, permanent magnet synchronous motor and vehicle

Info

Publication number: CN215870955U
Application number: CN202121679734.9U
Authority: CN
Inventors: 朱文华; 王波; 高桂芬
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-02-18
Anticipated expiration: 2031-07-22
Also published as: WO2023000735A1

Abstract

The utility model discloses a motor rotor, a permanent magnet synchronous motor and a vehicle, wherein the motor rotor comprises a rotor iron core and a magnetic steel mechanism, the magnetic steel mechanism comprises a magnetic steel body, the magnetic steel body comprises a bushing and a plurality of magnetic steels, an accommodating groove is formed in the rotor iron core, the bushing is installed in the accommodating groove and comprises a plurality of magnetic conductive plates which are arranged at intervals, the bushing is divided into a plurality of installation cavities which are sequentially arranged along the extending direction of the bushing by the plurality of magnetic conductive plates, the number of the installation cavities is consistent with the number of the magnetic steels, and one magnetic steel is installed in each installation cavity. Motor rotor is through installing each magnet steel in each installation cavity, and the bush encloses to locate outside the magnet steel to make bush and a plurality of magnet steel combination form a magnet steel body, the magnet steel body is not only convenient for produce material management, and through installing the magnet steel body in rotor core's storage tank, can realize motor rotor's assembly, simplified the assembly step, improved assembly efficiency.

Description

Motor rotor, permanent magnet synchronous motor and vehicle

Technical Field

The utility model relates to the technical field of motors, in particular to a motor rotor, a permanent magnet synchronous motor and a vehicle.

Background

At present, a permanent magnet synchronous motor is generally adopted as a driving piece in a new energy electric vehicle, the existing permanent magnet synchronous motor generally adopts an 8-pole synchronous motor in order to weaken the torque pulsation of the motor and meet the requirements of NVH (Noise, Vibration and Harshness) on the Noise, and the motor rotor of the 8-pole synchronous motor has the defects of large quantity of magnetic steel and large size specification, so that the field assembly steps of the motor rotor are complicated, the consumed time is long, the assembly efficiency is low, the production efficiency of the motor is influenced, and the material management is not facilitated.

In addition, most of the existing magnetic steels are rectangular magnetic steels, and the rectangular magnetic steels have poor adjustment flexibility, so that the sine degree of the air gap flux density (electromagnetic load) waveform of the motor is difficult to adjust, the harmonic content is large, and the performance indexes of motor torque ripple, NVH (noise, vibration and harshness) and the like are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a motor rotor, a permanent magnet synchronous motor and a vehicle, and aims to solve the problem that the existing motor rotor is low in assembly efficiency.

In order to achieve the purpose, the utility model provides a motor rotor, which comprises a rotor core and a magnetic steel mechanism, wherein the magnetic steel mechanism comprises a magnetic steel body, the magnetic steel body comprises a bushing and a plurality of magnetic steels, the rotor core is provided with a containing groove, the bushing is installed in the containing groove, the bushing comprises a plurality of magnetic conducting plates which are arranged at intervals, the bushing is divided into a plurality of installation cavities which are sequentially arranged along the extending direction of the bushing by the plurality of magnetic conducting plates, the number of the installation cavities is consistent with the number of the magnetic steels, and one magnetic steel is installed in each installation cavity.

Preferably, the bush still includes a plurality of location muscle, and is a plurality of the location muscle is followed the extending direction interval arrangement of bush, the location muscle connect in on the lateral wall of bush, a plurality of constant head tanks have been seted up to the cell wall of storage tank, just the quantity of constant head tank with the quantity of location muscle is unanimous and the one-to-one cooperation.

Preferably, the bush is trapezoidal frame, and a plurality of magnetic conduction board will trapezoidal frame is separated for a plurality of trapezoidal installation cavity, each all install one with the installation cavity shape matches the magnet steel in the installation cavity.

Preferably, the magnetic steel mechanism comprises four magnetic steel bodies, wherein two of the four magnetic steel bodies are first magnetic steel bodies, and the other two magnetic steel bodies are second magnetic steel bodies; the rotor core is provided with three accommodating grooves corresponding to the magnetic steel mechanism, one of the three accommodating grooves is a V-shaped accommodating groove, the other two accommodating grooves are strip-shaped accommodating grooves, the two strip-shaped accommodating grooves are symmetrically arranged in a V shape, the V-shaped accommodating groove is arranged close to the edge of the rotor core, and the two strip-shaped accommodating grooves are positioned on one side of the V-shaped accommodating groove, which is far away from the edge of the rotor core; two first magnetic steel bodies which are symmetrically arranged are arranged in the V-shaped containing groove, and one second magnetic steel body is arranged in each strip-shaped containing groove.

Preferably, in the first magnet steel body, two the bush passes through coupling assembling and connects formula structure as an organic whole, coupling assembling includes first connecting plate and second connecting plate, first connecting plate is close to rotor core's edge sets up, the second connecting plate is located first connecting plate deviates from one side of rotor core's edge, first connecting plate second connecting plate and two enclose between the lateral wall of bush and become to separate the magnetism chamber.

Preferably, the motor rotor comprises a plurality of magnetic steel mechanisms, the rotor core is of a circular ring structure, the magnetic steel mechanisms are arranged along the circumferential direction of the rotor core at intervals, and each magnetic steel mechanism is close to the outer edge of the rotor core.

Preferably, a plurality of lightening holes are formed in the rotor core, the lightening holes are arranged at intervals along the circumferential direction of the rotor core, and each lightening hole is arranged close to the inner edge of the rotor core.

Preferably, the bushing is an integrally formed piece.

The utility model also provides a permanent magnet synchronous motor which comprises the motor rotor.

The utility model also provides a vehicle comprising the permanent magnet synchronous motor.

In the motor rotor, the rotor core is provided with the containing groove for installing the bushing, the plurality of magnetic conduction plates in the bushing are arranged at intervals along the extending direction of the bushing to divide the bushing into the plurality of installation cavities, the magnetic steels are installed in the installation cavities, the number of the installation cavities is consistent with that of the magnetic steels and the installation cavities are arranged in a one-to-one correspondence mode.

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 the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of a partial structure of a rotor of an electric machine according to an embodiment of the present invention;

fig. 2 is a schematic partial structure diagram of a rotor core in a rotor of an electric machine according to an embodiment of the present invention;

FIG. 3 is a schematic plan view of a rotor core in a rotor of an electric machine according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a bushing in a rotor of an electric machine according to an embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the present embodiment are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The description of the orientations of "up", "down", "left", "right", etc. in the present invention, with reference to the orientation shown in fig. 3, is merely used to explain the relative positional relationship between the components in the attitude shown in fig. 3, and if the particular attitude is changed, the directional indication is changed accordingly.

The utility model provides a motor rotor.

A electric motor rotor 100 of this embodiment, electric motor rotor 100 includes rotor core 10 and magnet steel mechanism 20, magnet steel mechanism 20 includes magnet steel body 21, magnet steel body 21 includes bush 211 and a plurality of magnet steel 212, storage tank 11 has been seted up on rotor core 10, bush 211 is installed in storage tank 11, bush 211 includes a plurality of interval arrangement's magnetic conduction board 2111, a plurality of magnetic conduction boards 2111 separate bush 211 for a plurality of installation cavity 2112 of arranging in proper order along the extending direction of bush 211, the quantity of installation cavity 2112 is unanimous with the quantity of magnet steel 212, and all install a magnet steel 212 in each installation cavity 2112. It should be noted that the motor rotor 100 is applicable to a synchronous motor in the prior art, and in the present embodiment, the motor rotor 100 is applied to a permanent magnet synchronous motor as an example.

As shown in fig. 1 to 4, a containing groove 11 for installing the bushing 211 is formed in the rotor core 10, the plurality of magnetic conductive plates 2111 in the bushing 211 are arranged at intervals along the extending direction of the bushing 211 to divide the bushing 211 into a plurality of installation cavities 2112, the magnetic steel 212 is installed in the installation cavities 2112, the number of the installation cavities 2112 is consistent with the number of the magnetic steel 212, and the installation cavities are arranged in a one-to-one correspondence manner, in the motor rotor 100 in this embodiment, each magnetic steel 212 is installed in each installation cavity 2112, the bushing 211 is surrounded outside the magnetic steel 212, so that the bushing 211 and the plurality of magnetic steel 212 are combined to form one magnetic steel body 21, the magnetic steel body 21 is not only convenient for production material management, but also the assembly of the motor rotor 100 can be realized by installing the magnetic steel body 21 in the containing groove 11 of the rotor core 10, the assembly steps are simplified, and the assembly efficiency is improved.

In addition, the motor rotor 100 is provided with a plurality of magnetic conduction plates 2111 in the bushing 211, so that one magnetic conduction plate 2111 is arranged between any two adjacent magnetic steels 212, when the motor is loaded with constant torque, a straight-axis magnetic circuit is conveniently formed, the straight-axis magnetic resistance is reduced, and the peak torque and the flux weakening speed expansion capability of the permanent magnet synchronous motor are favorably improved; when the motor is loaded at constant power, the magnetic conduction plates 2111 provide magnetic leakage channels, so that the permanent magnet flux linkage of the motor is lowered, and the flux weakening and speed expansion capability of the motor is further improved.

In this embodiment, the bush 211 further includes a plurality of positioning ribs 2113, the plurality of positioning ribs 2113 are arranged at intervals along the extending direction of the bush 211, the positioning ribs 2113 are connected to the outer side wall of the bush 211, a plurality of positioning grooves 12 are formed in the groove wall of the accommodating groove 11, and the number of the positioning grooves 12 is consistent with that of the positioning ribs 2113 and is matched with the positioning ribs 2113 in a one-to-one correspondence manner. As shown in fig. 1 to 4, two ends of the magnetic conduction plate 2111 are connected to two inner side walls of the bushing 211 respectively, a plurality of positioning ribs 2113 are arranged on the outer side wall of the bushing 211, a plurality of positioning grooves 12 are formed in the wall of the accommodating groove 11, the positioning grooves 12 are used for being matched with the positioning ribs 2113, so that the bushing 211 is fixed in the accommodating groove 11 of the rotor core 10, the positioning ribs 2113 and the positioning grooves 12 play a role in positioning and installation, and the positioning ribs 2113 and the positioning grooves 12 can provide restraint force when the motor rotor 100 rotates at a high speed, so that the deformation of the rotor core 10 is reduced, and the high-speed operation of the motor is adapted.

Further, the bushing 211 is a trapezoid frame 211a, the trapezoid frame 211a is divided into a plurality of trapezoid mounting cavities 2112 by the plurality of magnetic conduction plates 2111, and a magnetic steel 212 matched with the mounting cavities 2112 in shape is mounted in each mounting cavity 2112. As shown in fig. 1 and 4, the bushing 211 is a trapezoidal frame 211a, the cross section of the installation cavity 2112 is trapezoidal, the magnetic steel 212 is a trapezoidal magnetic steel 212 matched with the shape of the installation cavity 2112, the trapezoidal magnetic steel 212 has high adjustable flexibility, and the trapezoidal magnetic steel 212 is adopted to enable the air gap magnetic density (electromagnetic load) waveform of the motor to be close to sine, reduce the harmonic content, reduce the torque ripple of the motor, and meet the NVH mute requirement. In addition, the magnetic steel 212 can be directly processed and formed according to the shape of the installation cavity 2112, the processing steps of the magnetic steel 212 are reduced, the coating area of the magnetic steel 212 is reduced, the economic cost is saved, and the bushing 211 can be used for bearing impact force and plays a role in protecting the magnetic steel 212.

In this embodiment, the magnetic steel mechanism 20 includes four magnetic steel bodies 21, and of the four magnetic steel bodies 21, two of the magnetic steel bodies 21 are first magnetic steel bodies 21a, and the other two magnetic steel bodies 21 are second magnetic steel bodies 21 b; the rotor core 10 is provided with three accommodating grooves 11 corresponding to the magnetic steel mechanism 20, one of the three accommodating grooves 11 is a V-shaped accommodating groove 11a, the other two accommodating grooves 11 are strip-shaped accommodating grooves 11b, the two strip-shaped accommodating grooves 11b are symmetrically arranged in a V shape, the V-shaped accommodating groove 11a is arranged close to the edge of the rotor core 10, and the two strip-shaped accommodating grooves 11b are positioned on one side of the V-shaped accommodating groove 11a, which is far away from the edge of the rotor core 10; two first magnetic steel bodies 21a which are symmetrically arranged are arranged in the V-shaped accommodating groove 11a, and a second magnetic steel body 21b is arranged in each strip-shaped accommodating groove 11 b.

As shown in fig. 1 to 4, one magnetic steel mechanism 20 includes two first magnetic steel bodies 21a and two second magnetic steel bodies 21b, the rotor core 10 is provided with one V-shaped accommodating slot 11a and two bar-shaped accommodating slots 11b corresponding to one magnetic steel mechanism 20, the two bar-shaped accommodating slots 11b are arranged at intervals, the V-shaped accommodating slot 11a and the two bar-shaped accommodating slots 11b are arranged at intervals along the radial direction of the rotor core 10, the two first magnetic steel bodies 21a are arranged symmetrically in the V-shaped accommodating slot 11a, the two second magnetic steel bodies 21b are respectively arranged in the two bar-shaped accommodating slots 11b correspondingly, the magnetic steel mechanism 20 improves the structural strength of the motor rotor 100, the motor rotor 100 can bear a large centrifugal force, is adapted to high-speed operation of the motor, improves the maximum safe speed of the motor, further improves the weak magnetic speed expansion capability of the motor, and improves the performance of the motor.

In two first magnet steel bodies 21a of this embodiment, two bushes 211 are connected as an organic whole structure through coupling assembling 30, and coupling assembling 30 includes first connecting plate 31 and second connecting plate 32, and first connecting plate 31 is close to the edge setting of rotor core 10, and second connecting plate 32 is located one side that first connecting plate 31 deviates from the edge of rotor core 10, encloses between the lateral wall of first connecting plate 31, second connecting plate 32 and two bushes 211 to have magnetism separating chamber 33.

As shown in fig. 1, the two bushings 211 of the two first magnet steel bodies 21a are connected to form an integral structure through the connection assembly 30, that is, the first connection plate 31 and the second connection plate 32 are integrally formed between the two bushings 211, two ends of the first connection plate 31 are respectively connected to outer sidewalls of the two bushings 211, two ends of the second connection plate 32 are respectively connected to outer sidewalls of the two bushings 211, and the first connection plate 31 and the second connection plate 32 are arranged along a radial direction of the rotor core 10 at intervals, so that a magnetic isolation cavity 33 is defined between the outer sidewalls of the first connection plate 31, the second connection plate 32 and the two bushings 211, and the magnetic isolation cavity 33 plays a role in reducing magnetic leakage.

In this embodiment, motor rotor 100 includes a plurality of magnet steel mechanisms 20, and rotor core 10 is the ring structure, and a plurality of magnet steel mechanisms 20 are arranged along rotor core 10's circumference interval, and each magnet steel mechanism 20 is close to rotor core 10's outward flange setting. In a preferred embodiment, as shown in fig. 3, the number of the magnetic steel mechanisms 20 is eight, the eight magnetic steel mechanisms 20 are arranged at intervals along the circumferential direction of the rotor core 10, three accommodating grooves 11 are formed in the rotor core 10 corresponding to one magnetic steel mechanism 20, and the number of the accommodating grooves 11 corresponds to the number of the magnetic steel mechanisms 20; in other embodiments, the number of the magnetic steel mechanisms 20 may also be four, six or other numbers, the number of the magnetic steel mechanisms 20 may be flexibly set according to actual use requirements, and the motor rotor 100 of the present invention does not limit the number of the magnetic steel mechanisms 20.

As shown in fig. 1 to 3, a plurality of lightening holes 13 are formed in the rotor core 10, the plurality of lightening holes 13 are arranged at intervals along the circumferential direction of the rotor core 10, each lightening hole 13 is arranged near the inner edge of the rotor core 10, the lightening holes 13 play a role in reducing the weight of the motor rotor 100, and in addition, the bushing 211 is an integrally formed part, that is, the plurality of magnetic conductive plates 2111 and the plurality of positioning ribs 2113 are integrally formed in the bushing 211, so that the manufacturing is easy, and the advantages of saving assembly steps and omitting assembly errors are achieved.

The utility model further provides a permanent magnet synchronous motor, which includes the motor rotor 100 as described above, and the specific structure of the motor rotor 100 refers to the above embodiments, and since the permanent magnet synchronous motor adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not repeated herein.

The present invention further provides a vehicle, where the vehicle includes the above-mentioned permanent magnet synchronous motor, the permanent magnet synchronous motor includes the above-mentioned motor rotor 100, the specific structure of the motor rotor 100 refers to the above-mentioned embodiments, and the vehicle may be a new energy electric vehicle using the permanent magnet synchronous motor as a driving member.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides an electric motor rotor, a serial communication port, electric motor rotor includes rotor core and magnet steel mechanism, magnet steel mechanism includes the magnet steel body, the magnet steel body includes bush and a plurality of magnet steel, the storage tank has been seted up on the rotor core, the bush install in the storage tank, the bush includes a plurality of interval arrangement's magnetic conduction board, and is a plurality of the magnetic conduction board will the bush is separated for a plurality of edges the installation cavity that the extending direction of bush was arranged in proper order, the quantity of installation cavity with the quantity of magnet steel is unanimous, and each all install one in the installation cavity the magnet steel.

2. The motor rotor as claimed in claim 1, wherein the bushing further includes a plurality of positioning ribs, the positioning ribs are spaced apart along an extending direction of the bushing, the positioning ribs are connected to an outer sidewall of the bushing, a plurality of positioning grooves are formed in a wall of the accommodating groove, and the number of the positioning grooves is consistent with the number of the positioning ribs and is matched with the positioning ribs in a one-to-one correspondence manner.

3. The motor rotor as claimed in claim 1, wherein the bushing is a trapezoid frame, the plurality of magnetic conductive plates divide the trapezoid frame into a plurality of installation cavities in a trapezoid shape, and each installation cavity is internally provided with one magnetic steel matched with the installation cavity in shape.

4. The electric machine rotor as recited in claim 1, wherein the magnetic steel mechanism includes four of the magnetic steel bodies, two of the four magnetic steel bodies being a first magnetic steel body and two of the other magnetic steel bodies being a second magnetic steel body; the rotor core is provided with three accommodating grooves corresponding to the magnetic steel mechanism, one of the three accommodating grooves is a V-shaped accommodating groove, the other two accommodating grooves are strip-shaped accommodating grooves, the two strip-shaped accommodating grooves are symmetrically arranged in a V shape, the V-shaped accommodating groove is arranged close to the edge of the rotor core, and the two strip-shaped accommodating grooves are positioned on one side of the V-shaped accommodating groove, which is far away from the edge of the rotor core; two first magnetic steel bodies which are symmetrically arranged are arranged in the V-shaped containing groove, and one second magnetic steel body is arranged in each strip-shaped containing groove.

5. The motor rotor as claimed in claim 4, wherein two of the first magnetic steel bodies and two of the bushings are connected into a single structure through a connecting assembly, the connecting assembly includes a first connecting plate and a second connecting plate, the first connecting plate is disposed near the edge of the rotor core, the second connecting plate is disposed on a side of the first connecting plate facing away from the edge of the rotor core, and a magnetic isolation cavity is defined between the first connecting plate, the second connecting plate and outer side walls of the two bushings.

6. The electric machine rotor of any of claims 1-5, wherein the electric machine rotor comprises a plurality of the magnetic steel mechanisms, the rotor core is a circular ring structure, the plurality of the magnetic steel mechanisms are arranged at intervals along a circumferential direction of the rotor core, and each of the magnetic steel mechanisms is arranged near an outer edge of the rotor core.

7. The electric machine rotor of claim 6, wherein a plurality of lightening holes are formed in the rotor core, the plurality of lightening holes are arranged at intervals along a circumferential direction of the rotor core, and each lightening hole is arranged near an inner edge of the rotor core.

8. An electric machine rotor as claimed in any of claims 1 to 5, characterised in that the bushing is an integrally formed piece.

9. A permanent magnet synchronous machine, characterized in that it comprises a machine rotor according to any of claims 1-8.

10. A vehicle, characterized in that the vehicle comprises a permanent magnet synchronous machine according to claim 9.