CN216312786U - Rotor subassembly and in-wheel motor - Google Patents

Abstract

The utility model belongs to the technical field of motors and discloses a rotor assembly and a hub motor. The rotor assembly comprises a plurality of magnetic steels and an annular rotor, the annular rotor is of an integral structure and can be integrally formed by machining a die, and the quality of a finished product is stable. Annular rotor has a plurality of inserting grooves and magnetism isolating groove, and a plurality of inserting grooves set up along annular rotor's circumferencial direction evenly distributed, and a plurality of magnet steel one-to-ones are pegged graft in a plurality of inserting grooves of annular rotor, adopt magnetism isolating groove structure to avoid the magnet steel magnetic leakage, compare the rotor core who assembles through the rotor core piece among the prior art, can set up more inserting grooves, and then hold more magnet steels, guarantee that the motor has stronger performance. Meanwhile, the rotor core of the structure has high structural strength, is simpler in production and manufacturing process, and is beneficial to batch production of the motor.

Description

Rotor subassembly and in-wheel motor

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor assembly and a hub motor.

Background

The rotor assembly of the hub motor comprises magnetic steel and a rotor core, and the hub motor is mainly applied to various vehicle types such as electric bicycles, electric motorcycles, electric automobiles and the like, integrates a power system, a transmission system and a braking system into a hub and is used for driving wheels.

In the existing salient pole rotor (patent number: ZL202020772162.8), a rotor core in the assembly comprises a plurality of rotor core blocks, an installation groove is formed between two adjacent rotor core blocks, a plurality of magnetic steels are inserted into the installation groove in a staggered manner, and the magnetic steels form a complete circular structure and are assembled on a rotor shell. Wherein, adopt the concatenation technology to connect between every rotor iron core piece, magnet steel and rotor iron core piece set up in turn, theoretically, under rotor iron core's the certain condition of size, the magnet steel of configuration is more, then the motor performance is better, but because rotor iron core forms through the concatenation of rotor iron core piece, in order to guarantee normally to assemble, the quantity of rotor iron core piece is limited, and magnet steel and rotor iron core piece set up in turn, the quantity of magnet steel is the same with the quantity of rotor iron core piece, thereby the quantity of magnet steel is limited, this performance that just leads to the motor is limited.

Therefore, a rotor assembly and an in-wheel motor are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a rotor assembly and a hub motor, so that the rotor assembly is simple to assemble, more magnetic steels can be assembled, and the motor performance is ensured.

In order to solve the problems in the prior art, the utility model adopts the following technical scheme:

a rotor assembly, comprising:

a plurality of magnetic steels;

the annular rotor is of an integrated structure and is provided with a plurality of insertion grooves, the insertion grooves are uniformly distributed in the circumferential direction of the annular rotor, and the magnetic steels are inserted into the insertion grooves of the annular rotor in a one-to-one correspondence mode.

Preferably, the annular rotor further has a plurality of magnetism isolating grooves arranged along the circumferential direction, and the plurality of magnetism isolating grooves are located between the outer circumferential surface of the annular rotor and the magnetic steel.

Preferably, the quantity of magnet steel is 2N, 2N two liang of magnet steel divide into N group's magnet steel group, every group two in the magnet steel group the magnet steel is adjacent to be set up, and is a plurality of the quantity in magnetism proof groove is N, and is N magnetism proof groove and N group the magnet steel group one-to-one sets up.

Preferably, the magnetism isolating groove is provided with a first end face and a second end face along the circumferential direction of the annular rotor, and each group of the magnetic steel group along the circumferential direction of the annular rotor is located between the first end face and the second end face of the corresponding magnetism isolating groove.

Preferably, the magnetic steel is provided with an N pole and an S pole, and the N poles of the two magnetic steels of the magnetic steel group are adjacent and oppositely arranged.

In order to achieve the above object, the present invention further provides a hub motor, which includes a rotating shaft, a hub, a stator assembly and a rotor assembly, wherein the hub is fixedly sleeved on the outer circumferential surface of the rotor assembly, the stator assembly is fixedly sleeved on the rotating shaft, and the rotor assembly is rotatably sleeved on the stator assembly.

Preferably, the hub motor further comprises two end covers, wherein the two end covers are rotatably sleeved on the rotating shaft and are located on two sides of the hub and fixedly connected to the hub respectively.

Preferably, the stator assembly includes a bracket, a ring stator and an armature winding, the bracket has a through hole, the rotating shaft is fixedly arranged through the through hole of the bracket, the ring stator is arranged on the bracket, and the armature winding is wound on the ring stator.

Preferably, the in-wheel motor further comprises a sealing ring, the sealing ring is located between the rotating shaft and the end cover, and the sealing ring is respectively connected with the rotating shaft and the end cover in a sealing mode.

Preferably, the in-wheel motor further comprises a sensor for detecting the rotation speed of the in-wheel motor.

The utility model has the beneficial effects that:

according to the rotor assembly provided by the utility model, the annular rotor is of an integrated structure and can be integrally formed by processing a die, and compared with a rotor core assembled by rotor core blocks in the prior art, more inserting grooves can be formed, so that more magnetic steels can be accommodated, and the motor has higher performance.

According to the hub motor provided by the utility model, the hub is fixedly sleeved on the outer circumferential surface of the rotor assembly, the rotor assembly is rotatably sleeved on the stator assembly, the structure is simple, the assembly is convenient, the integral design of the annular rotor ensures the regular overall size of the hub motor, and the hub motor is convenient to disassemble, assemble and maintain.

Drawings

Fig. 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion a of FIG. 1;

fig. 3 is a cross-sectional view of a hub motor according to a second embodiment of the present invention;

fig. 4 is a schematic structural diagram of a stator assembly according to a second embodiment of the present invention.

Reference numerals:

1. magnetic steel;

2. an annular rotor; 21. inserting grooves; 22. a magnetism isolating groove; 221. a first end face; 222. a second end face;

3. a rotating shaft;

4. a hub;

5. a stator assembly; 51. a support; 52. an annular stator; 53. an armature winding;

6. an end cap;

7. a seal ring;

8. a sensor.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

Example one

Rotor core includes a plurality of rotor core pieces among the current rotor subassembly, forms the mounting groove between two adjacent rotor core pieces, with a plurality of magnet steel crisscross insert the mounting groove in, assemble on the rotor shell after forming a complete circular structure jointly. Wherein, adopt the concatenation technology to connect between every rotor iron core piece, magnet steel and rotor iron core piece set up in turn, theoretically, under rotor iron core's the certain condition of size, the magnet steel of configuration is more, then the motor performance is better, but because rotor iron core forms through the concatenation of rotor iron core piece, in order to guarantee normally to assemble, the minimum size of rotor iron core piece is limited, and magnet steel and rotor iron core piece set up in turn, the quantity of magnet steel is close with the quantity of rotor iron core piece, thereby the quantity of magnet steel is limited, this performance that just leads to the motor is limited. To this, this embodiment provides a rotor subassembly, and the design of rotor core integral type makes the rotor subassembly assembly simple, can assemble more magnet steel, guarantees the motor performance.

As shown in fig. 1-2, the rotor assembly includes a plurality of magnetic steels 1 and a ring-shaped rotor 2, and the main function of the rotor assembly is to generate current by being cut by magnetic lines in a rotating magnetic field. Specifically, the annular rotor 2 is a closed annular structure and can be integrally formed by die machining. The annular rotor 2 is made of silicon steel sheet material, the silicon steel is a magnetic substance with strong magnetic conductivity, and in the electrified coil, the annular rotor 2 can generate larger magnetic induction intensity. Have a plurality of inserting grooves 21 on annular rotor 2, because annular rotor 2's integral type design, can set up more inserting grooves 21, wherein, a plurality of inserting grooves 21 set up along annular rotor 2's circumferencial direction evenly distributed, and a plurality of magnet steel 1 one-to-one are pegged graft in a plurality of inserting grooves 21 of annular rotor 2, and then can assemble more magnet steel 1, and the assembly is simple, guarantees that the motor has stronger performance.

Further, the annular rotor 2 further has a plurality of magnetism isolating grooves 22 arranged along the circumferential direction, and the plurality of magnetism isolating grooves 22 are located between the outer circumferential surface of the annular rotor 2 and the magnetic steel 1. The plurality of magnetic isolation grooves 22 are arranged between the outer circumferential surface and the inner circumferential portion of the annular rotor 2, it can be understood that an armature winding is arranged on the inner side of the annular rotor 2, the magnetic field lines of each magnetic steel 1 point to the S pole from the N pole, one part of the magnetic field lines pass through the inner side of the annular rotor 2, the other part of the magnetic field lines pass through the outer side of the annular rotor 2, the magnetic field lines of the magnetic steels 1 can be prevented from diverging to the outer side of the annular rotor 2 by the magnetic isolation grooves 22, and then the magnetic field lines are forced to pass through the inner side of the annular rotor 2 to form a magnetic circuit, so that the magnetic field lines can act on the armature winding as much as possible, and magnetic leakage is avoided.

Further, magnet steel 1's quantity is 2N, and 2N magnet steel 1 carries out two liang of groups, and every two magnet steel 1 are a set of, and the magnet steel group is organized into N altogether, and two adjacent settings of magnet steel 1 in each group magnet steel group insert in the inserting groove 21 of annular rotor 2, a plurality of magnet steel 1 and 2 looks butt of annular rotor, stable in structure. The quantity of a plurality of magnetism isolating grooves 22 is N, and N magnetism isolating grooves 22 and N group magnet steel group one-to-one set up, so set up accessible magnetism isolating grooves 22 and restrict two magnet steel 1's in the magnet steel group magnetic field simultaneously.

Specifically, the magnetism isolating groove 22 is provided with a first end surface 221 and a second end surface 222 along the circumferential direction of the annular rotor 2, the first end surface 221 and the second end surface 222 are oppositely arranged, the first end surface 221 of the first magnetism isolating groove 22 and the second end surface 222 of the second magnetism isolating groove 22 form ribs of the annular rotor 2, and two magnetic steels 1 of each group of magnetic steel group along the circumferential direction of the annular rotor 2 are located between the first end surface 221 and the second end surface 222 of the magnetism isolating groove 22.

Further, magnet steel 1 has the N utmost point and the S utmost point, and the N utmost point is adjacent and relative setting between two magnet steels 1 of arbitrary magnet steel group. Because the magnetic field lines of the magnetic steel 1 start from the N pole to the S pole, the N poles between the two magnetic steels 1 of the magnetic steel group are adjacent and oppositely arranged, when the magnetic field lines sent by the N pole pass through the outer side of the annular rotor 2 to the S pole, the part of the magnetic field lines can be completely separated by the magnetism isolating groove 22, and then the magnetic field lines sent by the N pole can only pass through the inner side of the annular rotor 2 to the S pole and completely act on the armature winding positioned on the inner side of the annular rotor 2.

Example two

As shown in fig. 3, the embodiment provides an in-wheel motor, which includes a rotating shaft 3, a hub 4, a stator assembly 5 and a rotor assembly, wherein the hub 4 is fixedly sleeved on an outer circumferential surface of the rotor assembly, the outer circumferential surface of the annular rotor 2 is fixed with the hub 4 through interference fit or pins, a tire of an automobile is sleeved on an outer surface of the hub 4, the hub motor drives the tire to rotate, and the hub 4 is made of iron, aluminum or plastic. Stator module 5 is the stationary part of in-wheel motor, and stator module 5 is fixed to be overlapped and is located on pivot 3, fastens through interference fit between stator module 5 and the pivot 3, and stator module 5 is located to the rotor subassembly rotation cover, and the rotor subassembly can revolve 3 rotations of axis of rotation. The stator assembly 5 includes armature windings 53 through which current passes to generate a rotating electromagnetic field and acts on the magnetic steel 1 on the ring rotor 2 to rotate the ring rotor 2.

Further, the hub motor further comprises two end covers 6, the two end covers 6 are rotatably sleeved on the rotating shaft 3, and the two end covers 6 are located on two sides of the hub 4 and are respectively and fixedly connected to the hub 4. Specifically, the shape of end cover 6 is the disc, two coaxial settings of end cover 6, the through-hole has been seted up in the centre of a circle department of end cover 6, the through-hole of end cover 6 is worn to locate by pivot 3, every end cover 6 inboard all is provided with the bearing, the inner circle of bearing and pivot 3 mutually support fixed connection, the outer lane and the end cover 6 fixed connection of bearing make end cover 6 can revolute pivot 3 and rotate, through the screw fastening between wheel hub 4 and the end cover 6, end cover 6 is used for supporting and protection in-wheel motor.

Further, the in-wheel motor further comprises a sealing ring 7. Specifically, the central point of in-wheel motor both sides puts and is provided with sealing washer 7, and sealing washer 7 lies in between pivot 3 and the end cover 6 and respectively with pivot 3 and end cover 6 sealing connection, injects lubricating oil on sealing washer 7, guarantees sealed between pivot 3 and the end cover 6 to in silt, dust and vapor etc. in the environment enter into the bearing, lubricating oil spills in the restriction bearing, simultaneously, guarantees the good lubricated condition of 3 positions of pivot, increase of service life.

Further, the in-wheel motor also comprises a sensor 8. Specifically, the in-wheel motor in this embodiment has a field weakening speed regulation function, the sensor 8 is a high-precision position sensor, the sensor 8 is used for detecting the rotation speed of the in-wheel motor, and the frequency converter is a power control device for controlling the alternating current motor by changing the frequency mode of the working power supply of the in-wheel motor. In the speed regulation of the frequency converter to the motor, when the output power of the frequency converter is higher than the rated power of the motor, the magnetic flux amplitude begins to weaken, the rotating speed of the motor is higher than the rated rotating speed, and at the moment, the hub motor enters the field weakening speed regulation.

Further, as shown in fig. 4, the stator assembly 5 includes a bracket 51, a ring stator 52, and an armature winding 53. Specifically, the stator assembly 5 mainly functions to generate a rotating magnetic field, a through hole is formed in the center of the bracket 51, and the rotating shaft 3 is fixedly inserted into the through hole of the bracket 51 and extends out of the end cover 6 of the motor from two ends. The ring stator 52 is a main magnetic circuit of the stator assembly 5, the ring stator 52 is disposed on the bracket 51, the armature winding 53 is wound on the ring stator 52, the armature winding 53 is formed by connecting a certain number of armature coils according to a certain rule, and the coils are wound by insulated wires with circular or rectangular cross sections. The armature winding 53 is one of the main components of the hub motor for realizing electromechanical energy conversion, the armature winding 53 generates induced electromotive force after being electrified to serve as a rotating magnetic field, and then generates electromagnetic torque for energy conversion, and the armature winding 53 can be a round copper wire or a flat copper wire.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A rotor assembly, comprising:

a plurality of magnetic steels (1);

annular rotor (2), annular rotor (2) formula structure as an organic whole, annular rotor (2) have a plurality of inserting groove (21), and is a plurality of inserting groove (21) are followed annular rotor (2)'s circumferencial direction evenly distributed sets up, and is a plurality of magnet steel (1) one-to-one peg graft in annular rotor (2) a plurality of in inserting groove (21).

2. The rotor assembly according to claim 1, wherein the annular rotor (2) further has a plurality of magnetism isolating grooves (22) arranged in a circumferential direction, the plurality of magnetism isolating grooves (22) being located between an outer circumferential surface of the annular rotor (2) and the magnetic steel (1).

3. The rotor assembly according to claim 2, wherein the number of the magnetic steels (1) is 2N, the 2N magnetic steels (1) are divided into N groups of magnetic steel groups two by two, two magnetic steels (1) in each group of the magnetic steel groups are adjacently arranged, the number of the plurality of magnetism isolating grooves (22) is N, and the N magnetism isolating grooves (22) are arranged in one-to-one correspondence with the N groups of the magnetic steel groups.

4. The rotor assembly according to claim 3, wherein the magnetism isolating grooves (22) are provided with a first end surface (221) and a second end surface (222) along the circumferential direction of the annular rotor (2), and each set of two magnetic steels (1) along the circumferential direction of the annular rotor (2) is positioned between the first end surface (221) and the second end surface (222) of the corresponding magnetism isolating grooves (22).

5. The rotor assembly according to claim 3, wherein the magnetic steels (1) have N poles and S poles, and the N poles of two magnetic steels (1) of any magnetic steel group are adjacent and opposite to each other.

6. An in-wheel motor, characterized by, including pivot (3), wheel hub (4), stator module (5) and according to the rotor subassembly of any one of claims 1-5, the outer periphery of rotor subassembly is located to wheel hub (4) fixed cover, stator module (5) is fixed to be located on pivot (3), the rotor subassembly rotates the cover and locates stator module (5).

7. The hub motor according to claim 6, further comprising two end covers (6), wherein the two end covers (6) are rotatably sleeved on the rotating shaft (3), and the two end covers (6) are located at two sides of the hub (4) and are respectively and fixedly connected to the hub (4).

8. The in-wheel motor according to claim 6, characterized in that the stator assembly (5) comprises a bracket (51), a ring-shaped stator (52) and an armature winding (53), the bracket (51) is provided with a through hole, the rotating shaft (3) is fixedly arranged in the through hole of the bracket (51), the ring-shaped stator (52) is arranged on the bracket (51), and the armature winding (53) is wound on the ring-shaped stator (52).

9. The in-wheel motor according to claim 7, characterized in that, the in-wheel motor further comprises a sealing ring (7), the sealing ring (7) is located between the rotating shaft (3) and the end cover (6), and the sealing ring (7) is respectively connected with the rotating shaft (3) and the end cover (6) in a sealing manner.

10. The in-wheel motor according to claim 6, characterized in that the in-wheel motor further comprises a sensor (8), the sensor (8) being configured to detect a rotational speed of the in-wheel motor.

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