WO2021143165A1

WO2021143165A1 - Rotor assembly

Info

Publication number: WO2021143165A1
Application number: PCT/CN2020/114631
Authority: WO
Inventors: 田井呈; 袁峥; 黄厚佳; 夏辰宇
Original assignee: 浙江盘毂动力科技有限公司
Priority date: 2020-01-13
Filing date: 2020-09-11
Publication date: 2021-07-22
Also published as: CN113113987A; CN113113987B

Abstract

A rotor assembly (1000), which is used for a disc motor, and comprises a magnetically permeable rotor bracket (100), a front end surface permanent magnet (200), and a middle permanent magnet (300); wherein the front end surface permanent magnet (200) and the middle permanent magnet (300) are both installed on the magnetically permeable rotor bracket (100), and the middle permanent magnet (300) is arranged to surround the front end surface permanent magnet (200); the front end surface permanent magnet (200) can be arranged to face a front stator core on the front end surface of the disc motor; the middle permanent magnet (300) can be arranged inside a stator groove of a middle stator core on the inner circumference of the disc motor, and a sidewall of the middle permanent magnet (300) is apart from a sidewall of the stator groove by a preset distance. In comparison to the prior art where only one magnetic field loop is formed for a disc motor, two magnetic field loops improve the energy conversion efficiency. In addition, the middle permanent magnet (300) and the front end surface permanent magnet (200) share one magnetically permeable rotor bracket (100), which improves the energy conversion capability and the volume to weight ratio of the disc motor.

Description

Rotor assembly

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on January 13, 2020 with the application number 202010033668.1, and the title of the invention is "a rotor assembly", the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to the technical field of motors, and in particular to a rotor assembly.

Background technique

At present, the rotor assembly of a disc motor includes a rotor disc and a permanent magnet installed on one side of the rotor disc, and the permanent magnet is arranged facing the stator core. The conversion between mechanical energy and electrical energy is realized by forming a complete magnetic circuit between the permanent magnet and the stator core.

However, the energy conversion efficiency of the disc motor is low.

Therefore, how to improve the energy conversion efficiency of the disc motor is a technical problem to be solved urgently by those skilled in the art.

Summary of the invention

In view of this, the object of the present invention is to provide a rotor assembly to improve the energy conversion efficiency of a disc motor.

In order to achieve the above objectives, the present invention provides the following solutions:

A rotor assembly for a disc motor, including a magnetically permeable rotor bracket, a front-end permanent magnet, and an intermediate permanent magnet;

The front-end permanent magnets and the middle permanent magnets are both installed on the permeable rotor support, and the middle permanent magnets are arranged around the front-end permanent magnets;

The permanent magnets on the front end face can be arranged face to face with the front stator iron core on the front end face of the disc motor;

The intermediate permanent magnet can be placed in the stator slot of the intermediate stator core in the inner circumferential direction of the disc motor, and the side wall of the intermediate permanent magnet is separated from the side wall of the stator slot by a preset distance.

In a specific embodiment, the rotor assembly further includes a rear permanent magnet;

The rear-end permanent magnets are installed on the magnetically permeable rotor bracket and are arranged back to back with the front-end permanent magnets;

The permanent magnets on the rear end face can be arranged face to face with the rear stator iron core on the rear end face of the disc motor.

In another specific embodiment, the magnetically permeable rotor support includes a first support disk and a second support disk that are coaxially arranged;

The first support plate is arranged on the first end surface of the second support plate, and a front end surface permanent magnet fixing groove for installing the front end surface permanent magnet is opened in the circumferential direction of the first support plate;

A middle permanent magnet fixing through groove for installing the middle permanent magnet is opened in the circumferential direction of the second support plate.

In another specific embodiment, the magnetically permeable rotor support further includes a third support disk arranged coaxially with the second support disk;

The third support plate is arranged on the second end surface of the second support plate, and a rear end surface permanent magnet fixing groove for installing the rear end surface permanent magnet is opened in the circumferential direction of the third support plate.

In another specific embodiment, the rotor assembly further includes a front-end surface permanent magnet limiter;

The permanent magnet fixing slot on the front end surface is a slot with at least one open end;

The front-end surface permanent magnet limiting member closes the open end of the front-end surface permanent magnet fixing groove, and is used to limit the front-end surface permanent magnet.

In another specific embodiment, the rotor assembly further includes an intermediate permanent magnet fastener;

The middle permanent magnet fastener closes the top of the middle permanent magnet fixing through groove, and is used to limit the middle permanent magnet.

In another specific embodiment, the rotor assembly further includes a permanent magnet stopper on the rear end surface;

The permanent magnet fixing groove on the rear end surface is a groove with at least one open end;

The rear-end surface permanent magnet limiting member closes the open end of the rear-end surface permanent magnet fixing groove for limiting the rear-end surface permanent magnet.

In another specific embodiment, both the front end surface permanent magnet fixing groove and the rear end surface permanent magnet fixing groove are grooves with one end closed and one end open, and the end away from the middle permanent magnet fixing through groove is Closed end

The outer wall of the front permanent magnet fastener is flush or lower than the bottom of the middle permanent magnet fixing through groove;

The outer wall of the rear permanent magnet fastener is flush or lower than the bottom of the middle permanent magnet fixing through groove.

In another specific embodiment, the number of the permanent magnet fixing grooves on the front face, the middle permanent magnet fixing grooves and the permanent magnet fixing grooves on the rear face are all equal;

And the symmetry planes of the front permanent magnet fixing groove, the middle permanent magnet fixing groove and the rear permanent magnet fixing groove are arranged to coincide.

In another specific embodiment, the magnetically permeable rotor support is made of electrical steel sheet or pressed by magnetic metal powder.

The various embodiments according to the present invention can be combined arbitrarily as required, and the embodiments obtained after these combinations are also within the scope of the present invention and are part of the specific embodiments of the present invention.

In a specific embodiment of the present invention, the present invention discloses a rotor assembly. When in use, the rotor assembly is rotatably installed in the disc motor so that the front end permanent magnet faces the front stator core surface on the front end of the disc motor, The middle permanent magnet is placed in the stator slot of the middle stator core in the inner circumferential direction of the disc motor. Because the side wall of the middle permanent magnet is separated from the side wall of the stator slot by a preset distance, the middle permanent magnet can follow the magnetism The rotation of the rotor support is transferred from one stator slot to the next. A closed magnetic field circuit is formed between the front stator iron core and the front permanent magnet and between the middle permanent magnet and the middle stator iron core. Compared with the disc motor in the prior art, only one magnetic field circuit is formed, and the two magnetic field circuits of the present invention are improved Improved energy conversion efficiency. In addition, the permanent magnets in the middle and the permanent magnets on the front end share a permeable rotor bracket, which improves the energy conversion capacity and the volume-to-weight ratio of the disk motor.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic diagram of an exploded structure of a rotor assembly provided by the present invention;

2 is a schematic diagram of the structure of the front-end permanent magnet provided by the present invention;

Fig. 3 is a schematic diagram of the structure of the magnetically permeable rotor support provided by the present invention.

Among them, in Figure 1-3:

Rotor assembly 1000, magnetic rotor support 100, front permanent magnet 200, middle permanent magnet 300, rear permanent magnet 400, first support disk 10, second support disk 11, front permanent magnet fixing groove 12, middle permanent magnet The fixing through groove 13, the third supporting plate 14, the rear permanent magnet fixing groove 15, the front permanent magnet stopper 500, the middle permanent magnet fastener 600, and the rear permanent magnet stopper 700.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to FIGS. 1-3 and specific embodiments.

Example one

The present invention provides a rotor assembly 1000, as shown in FIG. 1, which is used in a disc motor. The rotor assembly 1000 includes a magnetically permeable rotor support 100, a front end permanent magnet 200 and a middle permanent magnet 300. The front end permanent magnets 200 and the middle permanent magnet 300 are both installed on the permeable rotor support 100, and the middle permanent magnet 300 surrounds the front end. The surface permanent magnet 200 is provided. Specifically, the number of the front end permanent magnets 200 and the middle permanent magnets 300 are multiple, and the front end permanent magnets 200 and the middle permanent magnets 300 are evenly distributed on the permeable rotor support 100 along different radii and circumferential directions, and the middle permanent magnets The distribution radius of the magnet 300 is larger than the distribution radius of the front permanent magnet 200, that is, the middle permanent magnet 300 is distributed around the front permanent magnet 200.

The front permanent magnet 200 can be arranged face to face with the front stator iron core on the front end of the disc motor, that is, the front stator iron core is arranged facing the front permanent magnet 200, so that the front stator iron core and the front permanent magnet 200 can form a closed Magnetic field loop.

The middle permanent magnets 300 are placed in the stator slots of the middle stator core, the number of middle stator cores is the same as the number of middle permanent magnets 300, and there are also multiple middle permanent magnets 300 evenly distributed in the disc motor Zhou Shang.

Specifically, the stator slots of the middle stator core are through slots, and when the magnetically permeable rotor support 100 rotates, the middle permanent magnet 300 is driven to pass through one stator slot and enter the next stator slot. The side wall of the middle permanent magnet 300 is separated from the side wall of the stator slot by a preset distance, so as to avoid the middle permanent magnet 300 from colliding with the side wall of the stator slot when the magnetically permeable rotor support 100 rotates. The preset distance means that when the middle permanent magnet 300 and the middle stator core overlap, an air gap small enough is generated during the rotation, so that the middle permanent magnet 300 and the middle stator core form a short magnetic circuit, and the middle permanent magnet 300 and the middle stator core form a short magnetic circuit. When the stator cores are staggered, the air gap is large enough so that the middle permanent magnet 300 and the middle stator core cannot form a magnetic field loop, and there is no attraction between the middle permanent magnet 300 and the middle stator assembly, so as to realize the continuous rotation distance of the rotor assembly 1000.

The invention discloses a rotor assembly 1000. A closed magnetic field loop is formed between the front stator iron core and the front permanent magnet 200 and between the middle permanent magnet 300 and the middle stator iron core, which improves the energy conversion efficiency, and further improves the energy conversion ability and the disk The volume-to-weight ratio of the type motor.

Example two

In the second embodiment provided by the present invention, the structure of the rotor assembly 1000 in this embodiment is similar to that of the rotor assembly 1000 in the first embodiment, and the similarities are not repeated here, and only the differences are introduced.

In this embodiment, the present invention specifically discloses that the rotor assembly 1000 further includes a rear-end permanent magnet 400. The rear-end permanent magnet 400 is mounted on the permeable rotor support 100 and is arranged back-to-back with the front-end permanent magnet 200. The rear stator assembly and The rear permanent magnets 400 are arranged face to face, that is, the rear stator iron core is arranged facing the rear permanent magnet 400, so that the rear permanent magnet 400 and the rear stator iron core can form a closed magnetic field loop.

Further, the present invention discloses that the magnetically permeable rotor support 100 includes a first support plate 10 and a second support plate 11 that are coaxially arranged. As shown in FIG. 3, the first support plate 10 is arranged on the first support plate 11 of the second support plate 11. On one end surface, specifically, the first support plate 10 and the second support plate 11 are integrally formed and connected.

A front-end permanent magnet fixing groove 12 is provided in the circumferential direction of the first support plate 10, and the front-end permanent magnet fixing groove 12 is used to install the front-end permanent magnet 200. Specifically, the shape of the front end surface permanent magnet fixing groove 12 matches the shape of the front end surface permanent magnet 200. It should be noted that the permanent magnet fixing groove 12 on the front end surface may be a closed groove, a groove with one end open and one end closed, or a through groove with both ends open.

Further, the present invention discloses that the rotor assembly 1000 further includes a front end surface permanent magnet limiter 500. Specifically, the front end surface permanent magnet limiter 500 may have any shape, such as a circular ring. The front-end permanent magnet fixing groove 12 is a slot with at least one open end, and the front-end permanent magnet stopper 500 closes the open end of the front-end permanent magnet fixing groove 12 to limit the front-end permanent magnet 200. One end of the front face permanent magnet 200 abuts against the closed end of the front face permanent magnet fixing groove 12, and the other end of the front face permanent magnet 200 abuts against the front face permanent magnet 200 fastener.

In this embodiment, the permanent magnet fixing groove 12 on the front end is an open end and the other end is closed, and the end away from the middle permanent magnet fixing through groove 13 is the closed end as an example.

Further, the present invention discloses that the outer wall of the front permanent magnet 200 fastener is flush or lower than the bottom of the middle permanent magnet fixing through groove 13 to prevent the front permanent magnet 200 fastener from affecting the middle permanent magnet 300. It should be noted that the outer wall of the front end surface permanent magnet 200 fastener is lower than the bottom of the middle permanent magnet fixing through groove 13 means that the outer wall of the front end surface permanent magnet 200 fastener is along the radial direction of the permeable rotor bracket 100 It is lower than the bottom of the middle permanent magnet fixing through groove 13. In this embodiment, the outer wall of the front-end permanent magnet 200 fastener is flush with the bottom of the middle permanent magnet fixing through slot 13 as an example to beautify the appearance, and can achieve a larger size under the smaller size of the magnetic permeable rotor bracket 100 Installation of permanent magnet 200 on the front face of the size.

Further, the present invention discloses that the second support plate 11 is provided with a middle permanent magnet fixing through groove 13 in the circumferential direction, and the middle permanent magnet fixing through groove 13 is used for installing the middle permanent magnet 300. Specifically, the shape of the fixing groove of the middle permanent magnet 300 matches the shape of the middle permanent magnet 300.

Furthermore, the present invention discloses that the rotor assembly 1000 further includes a middle permanent magnet fastener 600 which closes the top of the middle permanent magnet fixing through slot 13 and is used for limiting the middle permanent magnet 300. Specifically, the rotor assembly 1000 further includes a middle permanent magnet fastener 600, and the middle permanent magnet fastener 600 closes the top of the middle permanent magnet fixing through slot 13 to limit the middle permanent magnet 300. One end of the middle permanent magnet 300 abuts against the closed end of the middle permanent magnet fixing through slot 13, and the other end of the middle permanent magnet 300 abuts against the middle permanent magnet fastener 600.

Further, the present invention discloses that the magnetically permeable rotor support 100 further includes a third support plate 14, the third support plate 14 is arranged coaxially with the second support plate 11, and the third support plate 14 is arranged on the second support plate 11 On the two end surfaces, specifically, the third supporting plate 14 is integrally connected with the first supporting plate 10 and the second supporting plate 11.

The third support plate 14 is provided with a rear permanent magnet fixing groove 15 in the circumferential direction, and the rear permanent magnet fixing groove 15 is used for installing the rear permanent magnet 400. Specifically, the shape of the permanent magnet fixing groove 15 on the rear end surface matches the shape of the permanent magnet 400 on the rear end surface. It should be noted that the rear permanent magnet fixing groove 15 may be a closed groove, a groove with one end open and one end closed, or a through groove with both ends open.

Furthermore, the present invention discloses that the rotor assembly 1000 further includes a rear-end surface permanent magnet limiter 700. Specifically, the rear-end surface permanent magnet limiter 700 may have any shape, such as a circular ring. The rear permanent magnet fixing slot 15 is a slot with at least one open end, and the rear permanent magnet stopper 700 closes the open end of the rear permanent magnet fixing slot 15 for limiting the rear permanent magnet 400. In this embodiment, the permanent magnet fixing groove 15 on the rear end is an open end and the other end is closed, and the end away from the middle permanent magnet fixing through groove 13 is the closed end as an example.

Further, the present invention discloses that the outer wall of the rear permanent magnet 400 fastener is flush with or lower than the bottom of the middle permanent magnet fixing through groove 13, so as to prevent the rear permanent magnet 400 fastener from affecting the middle permanent magnet 300. It should be noted that the outer wall of the fastener of the rear permanent magnet 400 lower than the bottom of the middle permanent magnet fixing through groove 13 means that the outer wall of the fastener of the rear permanent magnet 400 is along the radial direction of the permeable rotor bracket 100 It is lower than the bottom of the middle permanent magnet fixing through groove 13. In this embodiment, the outer wall of the rear permanent magnet 400 fastener is flush with the bottom of the middle permanent magnet fixing through slot 13 as an example to beautify the appearance, and can achieve a larger size under the smaller size of the permeable rotor bracket 100 Installation of permanent magnet 400 on the rear face of the size.

Further, the present invention discloses that the number of the front permanent magnet fixing groove 12, the middle permanent magnet 300 fixing groove and the rear permanent magnet fixing groove 15 are all equal, and the front permanent magnet fixing groove 12 and the middle permanent magnet 300 fixing groove are equal in number. It is arranged to coincide with the symmetry surface of the permanent magnet fixing groove 15 on the rear end surface, which is convenient for processing and manufacturing.

Further, the present invention discloses that the magnetically permeable rotor support 100 is made of electrical steel sheet or pressed by magnetic metal powder.

In the present invention, the front permanent magnet 200, the rear permanent magnet 400 and the middle permanent magnet 300 are all assembled on the permeable rotor support 100, and AC electric energy is supplied to each stator assembly to drive the rotor assembly 1000 to rotate, so as to realize the conversion of electric energy to mechanical energy. . When external machinery acts on the rotor assembly 1000 to drive the rotor assembly 1000 to rotate, electrical energy will be generated in each stator assembly, that is, the conversion of mechanical energy to electrical energy is realized.

Taking a disc motor as a motor as an example, the front stator winding wound in the core slot of the front stator core receives an external AC current, and the magnetic field generated by the AC current passes through the magnetic path of the front stator core and passes through The air between the front stator core and the front permanent magnet 200 merges with the magnetic field of one of the front permanent magnets 200 and flows into the other front permanent magnet 200 through the magnetizing action of the magnetic rotor support 100, and passes through it again. The passing air returns to the front stator core to form a closed loop. The rear stator windings wound in the core slots of the rear stator core are supplied with an external alternating current. The magnetic field generated by the alternating current passes through the magnetic path of the rear stator core and passes through the rear stator core and the rear permanent magnet 400. After converging with the magnetic field of one of the rear-end permanent magnets 400, the air flows into the other rear-end permanent magnet 400 through the permeable effect of the permeable rotor holder 100, and passes through the air again to return to the rear stator core to form a closed Of the loop. The middle stator winding on the middle stator core is supplied with an external alternating current, and the magnetic field generated by the alternating current passes through one end of the middle stator core and passes through the air between the middle stator core and the middle permanent magnet 300 to enter the middle permanent magnet 300, and Eventually it reaches the other end of the middle stator core, thus forming a closed loop. That is, the present invention integrates three energy flow paths in a limited volume space, which improves the energy conversion efficiency per unit volume.

It should be noted that the words indicating the position in this article, such as the words indicating the position such as up, down, left, right, etc., are only for the position of the structure shown in the corresponding drawings, and are only for the convenience of description, not Have other specific meanings.

It should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is any such actual relationship or order between. Moreover, the terms "including", "including" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. Or it also includes elements inherent to such items or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other same elements in the article or equipment that includes the above elements.

Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A rotor assembly for a disc motor, which is characterized in that it comprises a magnetically permeable rotor bracket, a front-end permanent magnet and an intermediate permanent magnet;

The front-end permanent magnets and the middle permanent magnets are both installed on the permeable rotor support, and the middle permanent magnets are arranged around the front-end permanent magnets;

The permanent magnets on the front end face can be arranged face to face with the front stator iron core on the front end face of the disc motor;

The intermediate permanent magnet can be placed in the stator slot of the intermediate stator core in the inner circumferential direction of the disc motor, and the side wall of the intermediate permanent magnet is separated from the side wall of the stator slot by a preset distance.
The rotor assembly according to claim 1, further comprising a permanent magnet on the rear end surface;

The rear-end permanent magnets are installed on the magnetically permeable rotor bracket and are arranged back to back with the front-end permanent magnets;

The permanent magnets on the rear end face can be arranged face to face with the rear stator iron core on the rear end face of the disc motor.
The rotor assembly according to claim 2, wherein the magnetically permeable rotor support comprises a first support disc and a second support disc arranged concentrically;

The first support plate is arranged on the first end surface of the second support plate, and a front end surface permanent magnet fixing groove for installing the front end surface permanent magnet is opened in the circumferential direction of the first support plate;

A middle permanent magnet fixing through groove for installing the middle permanent magnet is opened in the circumferential direction of the second support plate.
The rotor assembly according to claim 3, wherein the magnetically permeable rotor bracket further comprises a third support plate arranged coaxially with the second support plate;

The third support plate is arranged on the second end surface of the second support plate, and a rear end surface permanent magnet fixing groove for installing the rear end surface permanent magnet is opened in the circumferential direction of the third support plate.
The rotor assembly according to claim 4, further comprising a permanent magnet stopper on the front end surface;

The permanent magnet fixing slot on the front end surface is a slot with at least one open end;

The front-end surface permanent magnet limiting member closes the open end of the front-end surface permanent magnet fixing groove, and is used for limiting the front-end surface permanent magnet.
The rotor assembly of claim 5, further comprising a middle permanent magnet fastener;

The middle permanent magnet fastener closes the top of the middle permanent magnet fixing through groove, and is used to limit the middle permanent magnet.
The rotor assembly according to claim 5, further comprising a permanent magnet stopper on the rear end surface;

The permanent magnet fixing groove on the rear end surface is a groove with at least one open end;

The rear-end surface permanent magnet limiting member closes the open end of the rear-end surface permanent magnet fixing groove for limiting the rear-end surface permanent magnet.
The rotor assembly according to claim 7, wherein the front end surface permanent magnet fixing groove and the rear end surface permanent magnet fixing groove are both closed at one end and open at one end, and are away from the middle permanent magnet fixing channel. The end of the groove is the closed end;

The outer wall of the front permanent magnet fastener is flush or lower than the bottom of the middle permanent magnet fixing through groove;

The outer wall of the rear permanent magnet fastener is flush or lower than the groove bottom of the middle permanent magnet fixing through groove.
The rotor assembly according to claim 4, wherein the number of the permanent magnet fixing grooves on the front face, the middle permanent magnet fixing grooves and the permanent magnet fixing grooves on the rear face are all equal;

And the symmetry planes of the front permanent magnet fixing groove, the middle permanent magnet fixing groove and the rear permanent magnet fixing groove are arranged to coincide.
The rotor assembly according to any one of claims 1-9, wherein the magnetically permeable rotor support is made of electrical steel sheet or pressed by magnetic metal powder.