CN216981629U - Rotor structure, motor and vehicle - Google Patents

Abstract

The application relates to a rotor structure, motor and vehicle, this rotor structure includes rotor shaft and rotor core at least, and rotor core includes six same section rotor core units. Along the axial direction of rotor shaft, first section rotor core unit and sixth section rotor core unit all with the help of corresponding first keyway and key-type connection, and second section rotor core unit and fifth section rotor core unit all with the help of corresponding second keyway and key-type connection, and third section rotor core unit and fourth section rotor core unit all with the help of corresponding third keyway and key-type connection. The purpose of the mode that is different installation angle through first section rotor core unit to sixth section rotor core unit relative rotor shaft in order to realize the rotor slant is then can improve the magnetic field wave form, reduces the higher harmonic to can reduce motor electromagnetic noise and vibration.

Description

Rotor structure, motor and vehicle

Technical Field

The application relates to the technical field of motors, in particular to a rotor structure, a motor and a vehicle.

Background

At present, a permanent magnet synchronous motor is the mainstream of a driving motor of a new energy automobile in the domestic market, and along with the development of the new energy automobile industry, the performance requirement of the market on the permanent magnet synchronous motor is higher and higher, and the structural design of a motor rotor serving as one of permanent magnet synchronous motor bodies is more and more important.

Due to various reasons, the existing motor rotor structure can generate higher harmonics, and the higher harmonics cause the output torque fluctuation of the motor, further cause the rotation speed fluctuation, and further cause the vibration and the noise of the motor.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a rotor structure, a motor, and a vehicle, which are directed to the problem that the rotor structure of the motor generates higher harmonics.

The embodiment of the application provides a rotor structure, includes: the rotor shaft is provided with a key; the rotor core comprises six identical rotor core units, each rotor core unit is provided with a central hole, the six rotor core units are sequentially sleeved on the rotor shaft by means of the corresponding central holes along the axial direction of the rotor shaft, and the adjacent rotor core units are attached to each other; the center of the first key groove is connected with the center of the central hole at intervals, the center of the second key groove is connected with the center of the central hole at intervals, and the center of the third key groove is connected with the center of the central hole at intervals; an included angle formed by the first connecting line and the second connecting line is equal to an included angle formed by the second connecting line and the third connecting line; first section rotor core unit and sixth section rotor core unit all with the help of corresponding first keyway and key-type connection, and second section rotor core unit and fifth section rotor core unit all with the help of corresponding second keyway and key-type connection, and third section rotor core and fourth section rotor core all with the help of corresponding third keyway and key-type connection.

In one embodiment, the rotor core unit is further provided with a plurality of groove body units which surround the axis of the central hole and are arranged at intervals along the circumferential direction of the central hole; each groove body unit comprises two groups of magnetic groove groups which are arranged at intervals along the same radial direction of the central hole; each magnetic slot group comprises two containing slots symmetrically arranged by a radial reference plane, and a magnetic piece is arranged in each containing slot.

In one embodiment, the rotor core unit is further provided with a plurality of weight-reducing holes which are arranged around the axis of the central hole and are arranged at intervals along the circumferential direction of the central hole.

In one embodiment, a pin hole is provided radially outward of each lightening hole.

In one embodiment, at least one of the lightening holes is provided with a mark groove.

In one embodiment, the rotor structure further comprises a first bearing connected to the input end of the rotor shaft.

In one embodiment, the rotor structure further comprises a second bearing connected to the output end of the rotor shaft.

In one embodiment, the rotor core unit is formed by laminating a plurality of rotor core punching sheets.

An embodiment of the present application further provides a motor, including: such as the rotor structure described above.

An embodiment of the present application further provides a vehicle, including: such as the motor described above.

The application discloses a rotor structure, motor and vehicle, this rotor structure include rotor shaft and rotor core at least, and rotor core includes six same sections rotor core units. In the axial direction of following the rotor shaft, first section rotor core unit and sixth section rotor core unit all with the help of corresponding first keyway and key-type connection, and second section rotor core unit and fifth section rotor core unit all with the help of corresponding second keyway and key-type connection, and third section rotor core unit and fourth section rotor core unit all with the help of corresponding third keyway and key-type connection. The purpose of rotor oblique pole is realized in order to be the mode of different installation angle through first section rotor core unit to sixth section rotor core unit relative rotor shaft, and then can improve the magnetic field waveform, reduces higher harmonic to can reduce motor electromagnetic noise and vibration.

Drawings

FIG. 1 illustrates a schematic half-section view of a rotor structure provided by an embodiment of the present application;

fig. 2 shows a schematic structural diagram of a rotor core unit of a rotor structure provided in an embodiment of the present application.

Description of reference numerals: 100. a rotor shaft; 110. a key; 120. an input end of the rotor shaft; 130. an output end of the rotor shaft; 200. a rotor core; 300. a rotor core unit; 310. a central bore; o, the center of the central hole; 320. a first keyway; 330. a second keyway; 340. a third keyway; l1, first connection; l2, second connection; l3, third line; 350. a tank unit; 351. a magnetic slot group; 352. a containing groove; 353. a magnetic member; 360. lightening holes; 361. a marking groove; 370. a pin hole; 10. a first stage rotor core unit; 20. a second section of rotor core unit; 30. a third stage rotor core unit; 40. a fourth rotor core unit; 50. a fifth section of rotor core unit; 60. a sixth section of rotor core unit; 400. a first bearing; 500. a second bearing; f1, direction from left to right as shown in fig. 1.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only 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 application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; 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 meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As mentioned in the background, the current rotor structure of the motor generates higher harmonics, and the higher harmonics cause the output torque of the motor to fluctuate, which in turn causes the rotation speed to fluctuate, thereby causing the vibration and noise of the motor.

The inventor of the application notices that the magnetic field waveform of the motor can be improved and higher harmonics can be reduced by improving the structural design of the rotor, so that the electromagnetic noise and vibration of the motor can be reduced.

Based on this, the present inventors have conducted extensive studies and designed a rotor structure that can avoid the above-mentioned problems by using the same rotor core units and their corresponding predetermined installation angles.

Fig. 1 shows a schematic half-section view of a rotor structure provided in an embodiment of the present application, and fig. 2 shows a schematic structural view of a rotor core unit of the rotor structure provided in the embodiment of the present application.

In some embodiments, as shown in fig. 1 and 2, the present application provides a rotor structure, which includes a rotor shaft 100 and a rotor core 200, the rotor shaft 100 is provided with a key 110, the rotor core 200 includes six identical segments of rotor core units 300, and the rotor core units 300 have a central hole 310. Along the axial direction of the rotor shaft 100, six sections of rotor core units 300 are sequentially sleeved on the rotor shaft 100 by means of corresponding central holes 310, and the adjacent rotor core units 300 are attached to each other.

Specifically, the inner wall of the central hole 310 is sequentially provided with a first key groove 320, a second key groove 330 and a third key groove 340 at intervals along the circumferential direction, the line connecting the center of the first key groove 320 and the center O of the central hole is a first line L1, and the line connecting the center of the second key groove 330 and the center O of the central hole is a second line L2. A connecting line between the center of the third key groove 340 and the center O of the central hole is a third connecting line L3, and an included angle formed by the first connecting line L1 and the second connecting line L2 is equal to an included angle formed by the second connecting line L2 and the third connecting line L3.

More specifically, taking a direction F1 from left to right as an example shown in fig. 1, the six rotor core units are a first rotor core unit 10, a second rotor core unit 20, a third rotor core unit 30, a fourth rotor core unit 40, a fifth rotor core unit 50, and a sixth rotor core unit 60 in this order. The first segment of rotor core unit 10 and the sixth segment of rotor core unit 60 are connected to the key 110 by means of the corresponding first key slot 320, the second segment of rotor core unit 20 and the fifth segment of rotor core unit 50 are connected to the key 110 by means of the corresponding second key slot 330, and the third segment of rotor core 30 and the fourth segment of rotor core 40 are connected to the key 110 by means of the corresponding third key slot 340.

The rotor structure in the embodiment of the present application is configured such that the first segment rotor core unit 10 and the sixth segment rotor core unit 60 are connected to the key 110 by means of the corresponding first key groove 320 in the axial direction of the rotor shaft 100. The second segment of rotor core unit 20 and the fifth segment of rotor core unit 50 are both connected to the key 110 by means of the corresponding second key slot 330, so that the first line L1 of the second segment of rotor core unit 20 and the first line L1 of the fifth segment of rotor core unit 50 both form a first included angle with the first line L1 of the first segment of rotor core unit 10, and the size of the first included angle is equal to the included angle formed by the first line L1 and the second line L2.

The third segment of rotor core unit 30 and the fourth segment of rotor core unit 40 are both connected to the key 110 by means of the corresponding third key slot 340, so that the first connection line L1 of the third segment of rotor core unit 30 and the first connection line L1 of the fourth segment of rotor core unit 40 both form a second angle with the first connection line L1 of the first segment of rotor core unit 10, and the second angle is twice the angle formed by the first connection line L1 and the second connection line L2.

Therefore, the first section of rotor core unit 10 to the sixth section of rotor core unit 60 are sequentially assembled according to 0 degrees, the first included angle, the second included angle, the first included angle and 0 degrees, so that the purpose of rotor slant poles is achieved in a mode that the first section of rotor core unit 10 to the sixth section of rotor core unit 60 are different in installation angle relative to the rotor shaft 100, the magnetic field waveform can be further improved, higher harmonics are reduced, and the electromagnetic noise and vibration of the motor can be reduced.

In some embodiments, with continued reference to fig. 2, the rotor core unit 300 further includes a plurality of slot units 350 arranged around the axis of the central hole 310 and spaced along the circumference of the central hole, and each slot unit 350 includes two groups 351 of magnetic slots spaced along the same radial direction of the central hole 310. Each magnetic slot group 351 includes two receiving slots 352 symmetrically disposed on a radial reference plane, and each receiving slot 352 is provided with a magnetic member 353 therein. In this way, the magnetic member 353 is used to energize the coil of the motor to form a magnetic field to drive the motor to rotate.

Specifically, in some embodiments, two magnetic slot groups 351 are arranged in each group, the two magnetic slot groups 351 are symmetrically arranged about a radial reference plane and are distributed in a V shape, an opening of the V shape faces outward, and the magnetic members 353 arranged in each magnetic slot group 351 are arranged in a V-shaped manner through the V-shaped arrangement manner, so that a difference between a direct axis inductance and a quadrature axis inductance of the motor is increased, and a reluctance torque of the motor is effectively improved.

Optionally, the magnetic component 353 includes magnetic steel, and the magnetic steel may be made of alnico, which is not easy to demagnetize and has strong corrosion resistance.

In some embodiments, the first key slot 320, the second key slot 330 and the third key slot 340 may be disposed on the rotor core unit 300 at a slant angle of 5 °, for example, an included angle between a symmetric center line of the first key slot 320 and symmetric center lines of two adjacent magnetic slot groups 351 is 5 °, so as to implement a slant-pole 5-degree design of the first key slot 320, so as to further reduce tooth harmonics and cogging torque.

In some embodiments, the rotor core unit 300 is further provided with a plurality of weight-reducing holes 360 arranged around the axis of the central hole 310 and at intervals along the circumference thereof. Through the lightening holes 360, the weight of the rotor core unit 300 is reduced, the requirement of motor lightening is met, and the purposes of energy conservation and emission reduction are achieved.

In some embodiments, a pin bore 370 is provided radially outward of each lightening bore 360, while allowing for dynamic balancing of the rotor structure. Like this, wear to locate the pinhole 370 that each rotor core unit 300 corresponds in proper order through the pin, and then assemble six sections rotor core units 300 as an organic whole, and guarantee that rotor structure can realize oblique utmost point installation and can guarantee dynamic balance's effect again.

In some embodiments, at least one of the lightening holes 360 is provided with a marker groove 361. The mark groove 361 is provided to pay attention to the installation direction of the rotor core unit 300, thereby preventing the rotor core unit 300 from being installed reversely or incorrectly. In some embodiments, to facilitate viewing of the mark grooves 361, two mark grooves 361 are provided, and two mark grooves 361 are respectively provided on two adjacent lightening holes 360.

In some embodiments, the rotor structure in embodiments of the present application further comprises a first bearing 400 connected to the input end 120 of the rotor shaft. By providing the first bearing 400 between the input end 120 of the rotor shaft and the housing of the motor, a supporting function is achieved, the friction coefficient of the rotor shaft 100 during movement is reduced, and the revolution accuracy is ensured.

In some embodiments, the rotor structure in embodiments of the present application further comprises a second bearing 500 coupled to the output end 130 of the rotor shaft. The second bearing 500 is provided between the output end 130 of the rotor shaft and the housing of the motor, thereby serving as a support.

It should be noted that both the first bearing 400 and the second bearing 500 may be in interference fit with the rotor shaft 100, and are press-fitted by using a press-fitting machine, so as to improve the connection strength between the first bearing 400 and the rotor shaft 100 and the connection strength between the second bearing 500 and the rotor shaft 100.

In some embodiments, the rotor core unit 300 is formed by laminating a plurality of rotor core sheets, so as to ensure that the rotor structure in the embodiment of the present application has sufficient use strength and stability.

Based on the same inventive concept, the embodiment of the present application further provides a motor, which includes the rotor structure in the above embodiment, where the rotor structure includes a rotor shaft 100 and a rotor core 200, and the rotor core 200 includes the same six-segment rotor core unit 300. In the axial direction of the rotor shaft 100, the first segment of rotor core unit 10 and the sixth segment of rotor core unit 60 are connected to the key 110 by means of the corresponding first key slot 320, the second segment of rotor core unit 20 and the fifth segment of rotor core unit 50 are connected to the key 110 by means of the corresponding second key slot 330, and the third segment of rotor core unit 30 and the fourth segment of rotor core unit 40 are connected to the key 110 by means of the corresponding third key slot 340. The purpose of rotor oblique pole is realized in a mode of being different installation angles relative to the rotor shaft 100 through the first-section rotor core unit 10 to the sixth-section rotor core unit 60, and then the magnetic field waveform can be improved, and higher harmonics are reduced, so that the electromagnetic noise and vibration of the motor can be reduced. It should be noted that, the beneficial effects corresponding to the rotor structure in the above embodiment can also refer to the description in the above embodiment, and are not repeated herein.

Based on the same inventive concept, the embodiment of the present application further provides a vehicle, including the motor in the above embodiment, where the motor includes the structure of the rotor in the above embodiment, and the purpose of rotor pole-tilting is achieved through the structure of the rotor, so that the magnetic field waveform can be improved, and higher harmonics can be reduced, thereby reducing electromagnetic noise and vibration of the motor, and improving the performance of the vehicle. It should be noted that, the beneficial effects corresponding to the motor in the above embodiment can also refer to the description in the above embodiment, and are not described herein again.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A rotor structure, comprising:

the rotor shaft is provided with a key; and

the rotor core comprises six identical sections of rotor core units, the rotor core units are provided with center holes, the six sections of rotor core units are sequentially sleeved on the rotor shaft by means of the corresponding center holes along the axial direction of the rotor shaft, and the adjacent rotor core units are attached to each other;

the inner wall of the central hole is sequentially provided with a first key groove, a second key groove and a third key groove at intervals along the circumferential direction of the inner wall, the connecting line of the center of the first key groove and the center of the central hole is a first connecting line, the connecting line of the center of the second key groove and the center of the central hole is a second connecting line, and the connecting line of the center of the third key groove and the center of the central hole is a third connecting line;

an included angle formed by the first connecting line and the second connecting line is equal to an included angle formed by the second connecting line and the third connecting line;

the rotor core unit and the sixth section are connected with the key by means of corresponding first key grooves, the rotor core unit and the fifth section are connected with the key by means of corresponding second key grooves, and the rotor core unit and the fourth section are connected with the key by means of corresponding third key grooves.

2. The rotor structure according to claim 1, wherein the rotor core unit is further provided with a plurality of slot units surrounding the axis of the central hole and arranged at intervals along the circumferential direction of the central hole;

each groove body unit comprises two groups of magnetic groove groups which are arranged at intervals along the same radial direction of the central hole;

each magnetic slot group comprises two accommodating slots symmetrically arranged by a radial reference plane, and a magnetic piece is arranged in each accommodating slot.

3. The rotor structure according to claim 1, wherein the rotor core unit is further provided with a plurality of weight-reducing holes arranged around an axis of the central hole and at intervals along a circumferential direction thereof.

4. A rotor structure as claimed in claim 3, wherein each of the lightening holes is provided with a pin hole at a radially outer side thereof.

5. A rotor structure according to claim 3, wherein at least one of the lightening holes is provided with a mark groove.

6. The rotor structure of claim 1, further comprising a first bearing coupled to an input end of the rotor shaft.

7. The rotor structure of claim 1, further comprising a second bearing connected to an output end of the rotor shaft.

8. The rotor structure of claim 1, wherein the rotor core unit is formed by laminating a plurality of rotor core laminations.

9. An electric machine, comprising: a rotor structure as claimed in any one of claims 1 to 8.

10. A vehicle, characterized by comprising: the electric machine of claim 9.

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