Motor rotor and motor

Abstract

The invention provides a motor rotor and a motor. In the motor rotor, the carbon fiber sleeve sleeved on the peripheral surface of the rotor main body provides effective protection for the rotor main body, and particularly provides good protection for each rotor unit forming the rotor main body under the condition of high rotating speed. Therefore, the structural strength and the structural stability of the motor rotor can be ensured, and the rotor main body can adapt to a working state with a relatively high rotating speed. Moreover, each split part of the rotor main body is mounted on the mounting part, and a part of centrifugal force generated by each split part of the rotor main body in the working process of the motor rotor acts on the mounting part, so that the component of the centrifugal force applied to the carbon fiber sleeve can be reduced; therefore, the magnitude of the acting force acting on the carbon fiber sleeve is reduced, and the deformation risk of the rotor main body is also reduced. The structural strength and the structural stability of the whole motor rotor are further improved.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a motor rotor and a motor comprising the motor rotor. Background Art

[0002] In the existing electric drive system of vehicles, motors (such as permanent magnet synchronous motors) are usually used to drive the vehicle, which requires the motor to have a high speed so that the vehicle has better performance. However, as the speed of the motor increases, the rotor will be subjected to very large centrifugal force, which may cause the rotor structure to deform and break. In existing motors, the speed of the rotor may reach 20,000 revolutions per minute. The structural strength of the motor rotor with a split structure is insufficient and not stable enough, and it is difficult to adapt to such a high speed state, thereby affecting the structural stability of the rotor and even the entire motor. Summary of the invention

[0003] This application is made in view of the above-mentioned state of the prior art. One object of this application is to provide a motor rotor, which can improve the structural strength and structural stability to adapt to high speed conditions. Another object of this application is to provide a motor including the above-mentioned motor rotor.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions.

[0005] The present application provides a motor rotor, comprising:

[0006] A rotor body, which is formed in a cylindrical shape as a whole, and includes a plurality of rotor units stacked in an axial direction thereof, each of the rotor units including a plurality of split parts and a mounting part, the plurality of split parts being evenly distributed at intervals in the circumferential direction of the rotor body, the radial inner end of each of the split parts being mounted on the mounting part, so that the plurality of split parts and the mounting part are relatively fixed at least in the radial direction of the rotor body, and a groove is defined between every two of the split parts adjacent to each other in the circumferential direction;

[0007] A first magnet is installed in the slot and fixed relative to the rotor body; and

[0008] The carbon fiber sleeve is formed into a cylindrical shape and covers the entire outer peripheral surface of the rotor body.

[0009] In an optional solution, the carbon fiber sleeve is a cylindrical body formed by winding a carbon fiber strip on the outer circumferential surface of the rotor body.

[0010] In another optional solution, each of the split parts has the same fan-shaped structure and is made of a plurality of sheet-like stacked bodies stacked in the axial direction, and

[0011] The mounting member has an integral annular shape, and different split members are mounted on different positions of the mounting member. Each of the rotor units includes one mounting member, or two or more rotor units share one mounting member.

[0012] In another optional scheme, one of the split component and the mounting component is formed with a mounting groove extending along the axial direction, and the other of the split component and the mounting component is formed with a mounting protrusion that cooperates with the mounting groove. The mounting protrusion is installed together with the mounting groove, so that the split component and the mounting component cannot be separated in the radial direction.

[0013] In another optional solution, the mounting groove is a dovetail groove.

[0014] In another optional solution, the split component is formed with a plurality of limiting ribs on its circumferential side wall, and the limiting ribs extend along the axial direction to radially limit the first magnet.

[0015] In another optional solution, a plurality of the first magnets are accommodated and installed in each of the slots, and the plurality of the first magnets are arranged in the radial direction.

[0016] In another optional solution, the first magnets adjacent to each other in the radial direction are spaced apart from each other; or

[0017] The first magnets adjacent to each other in the radial direction are in contact with each other and fixed together by bonding.

[0018] In another optional solution, a second magnet is further included, and each of the split parts is formed with a magnet slot that penetrates along the axial direction, and the second magnet is inserted and installed in the magnet slot.

[0019] The present application also provides a motor, comprising the motor rotor described in any one of the above technical solutions.

[0020] By adopting the above technical solution, the present application provides a new type of motor rotor and a motor including the motor rotor. In the motor rotor of the present application, it includes a rotor body, a plurality of magnets and a carbon fiber sleeve assembled together. The rotor body is formed into a cylindrical shape as a whole, and the rotor body includes a plurality of rotor units stacked in the axial direction, and each rotor unit includes a plurality of split parts and a mounting part. Further, the plurality of split parts are evenly distributed in a spaced manner in the circumferential direction of the rotor body, and the radial inner end of each split part is mounted on the mounting part, so that the plurality of split parts and the mounting part are relatively fixed at least in the radial direction of the rotor body. Moreover, a plurality of slots are defined by the plurality of split parts, and a plurality of magnets are inserted and mounted in these slots. Further, the carbon fiber sleeve is formed into a cylindrical shape and is coated on the outer circumferential surface of the rotor body.

[0021] In this way, on the one hand, the carbon fiber sleeve mounted on the outer peripheral surface of the rotor body provides effective protection for the rotor body, especially provides good protection for the various rotor units constituting the rotor body under high speed conditions. Therefore, the structural strength and structural stability of the motor rotor of the present application can be guaranteed, so that the rotor body can adapt to the working state of a relatively large speed (for example, greater than 23,000 revolutions per minute). On the other hand, by installing the various split parts of the rotor body on the mounting parts, a part of the centrifugal force generated by the various split parts of the rotor body during the operation of the motor rotor acts on the mounting parts, thereby reducing the size of the centrifugal force applied to the carbon fiber sleeve, thereby reducing the size of the force acting on the carbon fiber sleeve and also reducing the risk of deformation of the rotor body. This further improves the structural strength and structural stability of the entire motor rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A 1 is a perspective schematic diagram showing a motor rotor according to a first embodiment of the present application.

[0023] Figure 1B It shows Figure 1A Schematic diagram of the main view of the motor rotor in .

[0024] Figure 2A It shows Figure 1A A three-dimensional schematic diagram of multiple split parts of the rotor body of the motor rotor.

[0025] Figure 2B It shows Figure 1A A three-dimensional schematic diagram of a split part of the rotor body of the motor rotor.

[0026] Figure 2C It shows Figure 1A A three-dimensional schematic diagram of the mounting parts of the rotor body of the motor rotor.

[0027] Figure 3 It shows Figure 1A A three-dimensional schematic diagram of a first magnet of a motor rotor in FIG.

[0028] Figure 4 It shows Figure 1A Schematic diagram of the front view of the carbon fiber sleeve of the motor rotor.

[0029] Figure 5A is a schematic perspective view showing a motor rotor according to a second embodiment of the present application.

[0030] Figure 5B It shows Figure 5A Schematic diagram of the main view of the motor rotor in .

[0031] Fig. 6AIt shows Figure 5A A three-dimensional schematic diagram of multiple split parts of the rotor body of the motor rotor.

[0032] Figure 6B It shows Figure 5A A three-dimensional schematic diagram of a split part of the rotor body of the motor rotor.

[0033] Figure 7 It shows Figure 5A A three-dimensional schematic diagram of multiple first magnets of the motor rotor.

[0034] Description of Reference Numerals

[0035] 1 rotor body; 1h slot; 11 split part; 11p mounting protrusion; 11h1 magnet slot; 11h2 positioning hole; 111 body part; 112 limiting rib; 12 mounting part; 12h mounting slot; 121 annular part; 122 tooth part;

[0036] 2 a first magnet;

[0037] 3 second magnet;

[0038] 4 Carbon fiber sleeves;

[0039] 5 rotor shaft;

[0040] A: axial direction; C: circumferential direction. DETAILED DESCRIPTION

[0041] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0042] It should be noted that, in this application, unless otherwise specified, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the motor rotor (rotor body), respectively. "Radially outer" refers to the side radially away from the central axis of the motor rotor, and "radially inner" refers to the side radially close to the central axis of the motor rotor.

[0043] The structure of the motor rotor according to the first embodiment of the present application is described below in conjunction with the accompanying drawings.

[0044] (Motor rotor according to the first embodiment of the present application)

[0045] like Figure 1A and Figure 1BAs shown, the motor rotor according to the first embodiment of the present application includes a rotor body 1, a first magnet 2, a second magnet 3, a carbon fiber sleeve 4 and a rotor shaft 5 assembled together. The first magnet 2 and the second magnet 3 are both received and installed in the rotor unit of the rotor body 1, the carbon fiber sleeve 4 is coated on the outer circumference of the rotor body 1, and the rotor shaft 5 is inserted and fixed in the rotor body 1.

[0046] In this embodiment, if Figure 1A and Figure 1B As shown, the rotor body 1 is formed as a whole in a cylindrical shape. The rotor body 1 may include a plurality of rotor units stacked and arranged in the axial direction A. The plurality of rotor units may have the same structure and be arranged in a coaxial manner, and the adjacent rotor units are completely aligned in the circumferential direction C of the motor rotor, and the positions of the magnets 2 and 3 installed in the adjacent rotor units may be completely aligned. The motor rotor formed by this structure is a so-called straight slot motor rotor. Specifically, as Figure 2A , Figure 2B and Figure 2C As shown, each rotor unit includes a plurality of split parts 11 and mounting parts 12 .

[0047] like Figure 2A , Figure 2B and Figure 2CAs shown, the split parts 11 have the same fan-shaped structure, and each split part 11 can be formed by stacking a plurality of sheet-like laminates having the same structure in the axial direction A. The sheet-like laminates constituting each split part 11 can be sheets formed by the same stamping process, wherein a typical example of the sheet is a silicon steel sheet, or a sheet made of other conductive materials. Since the sheet-like laminate used to form the split part 11 has a small area and a relatively regular shape, compared with the solution in which the rotor unit is composed of an integrated sheet-like laminate, the utilization rate of the stamping material can be improved, thereby saving costs. Each split part 11 includes a main body 111 and a limiting rib 112 formed as an integral body. Specifically, the main body 111 has a fan-shaped structure, and the radial inner end of the main body 111 is formed as a mounting protrusion 11p to be mounted on the mounting part 12. In fact, multiple split parts 11 are evenly distributed at intervals in the circumferential direction C, and the radial inner end of the main body 111 of each split part 11 is installed on the mounting part 12, so that the multiple split parts 11 and the mounting part 12 are relatively fixed in both the circumferential direction C and the radial direction. Four limiting ribs 112 are formed on each circumferential side wall of the main body 111, and each limiting rib 112 extends linearly along the axial direction A. The two limiting ribs 112 located on the radial outer side are used to radially limit one first magnet 2, and the two limiting ribs 112 located on the radial inner side are used to radially limit another first magnet 2. In addition, the main body 111 of each split part 11 is also formed with a magnet slot 11h1 and a positioning hole 11h2 that pass through along the axial direction A. The magnet groove 11h1 and the positioning hole 11h2 are separated from each other. The magnet groove 11h1 is used to receive and install the second magnet 3 , and the positioning hole 11h2 is used to position the split component 11 during the process of installing the split component 11 on the mounting component 12 .

[0048] like Figure 2C As shown, the mounting member 12 can be made of steel and have an integral annular shape, and different split members 11 are mounted on different parts of the mounting member 12. The mounting member 12 includes an annular portion 121 formed as an integral body and a plurality of teeth 122 protruding from the annular portion 121 toward the radial outside, and adjacent teeth 122 define mounting grooves 12h for cooperating with mounting protrusions 11p of the split member 11. Each mounting groove 12h can be a dovetail groove extending along the axial direction. In this way, the mounting protrusion 11p formed at the radial inner end of each split member 11 can be inserted and installed in the mounting groove 12h along the axial direction A, and the split member 11 is mounted on the mounting member 12 by the mounting protrusion 11p and the mounting groove 12h being matched and installed together, so that the split member 11 and the mounting member 12 cannot be separated in the radial direction of the motor rotor.

[0049] In this embodiment, in order to accommodate and install the first magnet 2, as shown in FIG. Figure 2AAs shown, a slot 1h is defined between the circumferential side walls of the main body 111 of each two adjacent split parts 11 in the circumferential direction C, and two first magnets 2 are accommodated and installed in each slot 1h. The two first magnets 2 are adjacent in the radial direction, and their positions are limited by the limiting ribs 112 of the split parts 11 so as to be spaced apart from each other in the radial direction. Figure 3 As shown, the first magnet 2 is in the shape of a rectangular parallelepiped. In order to accommodate and install the second magnet 3, as shown in FIG. Figure 2A and Figure 2B As shown, the main body 111 of the split part 11 is formed with a magnet slot 11h1 that passes through along the axial direction A, and a second magnet 3 is accommodated and installed in each magnet slot 11h1. Similar to the shape of the first magnet 2, the shape of the second magnet 3 can be a rectangular parallelepiped. In addition, in order to avoid interference and the like, the axial end faces of the first magnet 2 accommodated and installed in the slot 1h and the second magnet 3 accommodated and installed in the magnet slot 11h1 can be flush with the axial end faces of the split part 11 on which they are installed. By forming the first magnet 2 and the second magnet 3 arranged as above, the magnetic flux from the motor rotor to the motor stator can be increased.

[0050] In this embodiment, if Figure 1A , Figure 1B and Figure 4 As shown, the carbon fiber sleeve 4 can be a cylindrical body formed by winding a carbon fiber strip on the outer circumference of the rotor body 1. The carbon fiber sleeve 4 covers the entire outer circumference of the rotor body 1 to limit the deformation of the rotor unit of the rotor body 1 that may occur in a high speed state. Based on the evaluation of the centrifugal force of the electronic rotor, the thickness of the carbon fiber sleeve 4 can be set to be greater than or equal to 0.5 mm and less than or equal to 3 mm. In addition, in the process of winding the carbon fiber sleeve 4, a pre-tightening force can be applied and / or it can be carried out in a low temperature environment (for example, minus 20 degrees), which is conducive to reducing the thickness of the carbon fiber sleeve 4.

[0051] In this embodiment, if Figure 1A and Figure 1B As shown, the rotor body 1 is sleeved on the rotor shaft 5 and fixed together with the rotor shaft 5. The rotor shaft 5 can be connected to a transmission of a vehicle to transmit torque in both directions.

[0052] By adopting the above scheme, on the one hand, the carbon fiber sleeve 4 sleeved on the rotor body 1 provides effective protection for the rotor body 1, especially providing good protection for each rotor unit constituting the rotor body 1 under high speed conditions; on the other hand, by installing each split part 11 of the rotor body 1 on the mounting part 12, the centrifugal force generated by the split parts 11 of the rotor body 1 during the operation of the motor rotor can be reduced. In other words, the force acting on the carbon fiber sleeve 4 is reduced, and the deformation risk of the rotor body is also reduced. This improves the structural strength and structural stability of the rotor.

[0053] The structure of the motor rotor according to the second embodiment of the present application is described below in conjunction with the accompanying drawings.

[0054] (Motor rotor according to the second embodiment of the present application)

[0055] The structure of the motor rotor according to the second embodiment of the present application is substantially the same as the structure of the motor rotor according to the first embodiment of the present application, and the differences between the two are mainly described below.

[0056] In this embodiment, if Figure 5A , Figure 5B , Fig. 6A and Figure 6B As shown, each circumferential side wall of the main body 111 of the split member 11 is formed with two limiting ribs 112, and a number greater than two first magnets 2 are installed in the groove 1h defined between each two adjacent split members 11 in the circumferential direction C. Figure 71 shows a portion of the first magnet 2 installed in a slot 1h. Each first magnet 2 extends along the axial direction A over the entire axial length of the split part 11, and all the first magnets 2 are arranged radially and in contact with each other (including substantially in contact). In this embodiment, these first magnets 2 can be fixed together by bonding with an adhesive. It can be understood that the adhesive here is used to fix adjacent first magnets 2 to each other, rather than to separate adjacent first magnets 2 from each other, so the first magnets 2 of this embodiment are fixed together by bonding with an adhesive and are still within the range where the first magnets 2 are arranged radially and in contact with each other. These first magnets 2 can not only reduce eddy current losses, but also have stronger stress resistance. Compared with a magnet with a larger size formed as one body, the arrangement of multiple first magnets 2 with smaller sizes can reduce the probability of magnet breakage. In addition, since the multiple first magnets 2 provide sufficient magnetic flux, each split part 11 omits the magnet slot 11h1 for accommodating and installing the second magnet 3 described in the first embodiment, and omits the second magnet 3. Of course, this is not necessary, and in this embodiment, the second magnet 3 can still be provided. In addition, in this embodiment and the first embodiment, the second magnet 3 may also be a plurality of magnets arranged in the circumferential direction or in a direction tangential to the circumferential direction and in contact with each other. Further, for the convenience of processing, the positioning holes 11h2 used for positioning during installation may be omitted.

[0057] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application. Further, the following supplementary explanations are provided.

[0058] i. The present application also provides a motor, which includes a motor rotor and a motor stator according to the present application. The motor stator can be located radially outside the motor rotor and separated from the motor rotor by a predetermined gap. In an optional solution, the motor can also include a rotor bracket, the motor rotor can be fixed to the rotor bracket from the radial outside, and the rotor bracket is mounted on the rotor shaft 5 from the radial outside.

[0059] It can be understood that in the axial direction A, the split parts 11 and the mounting parts 12 of the plurality of rotor units can be relatively fixed by other components such as a balancing disk of the motor.

[0060] ii. It can be understood that the motor rotor of the present application is not limited to a straight slot motor rotor. For example, the slot units of adjacent rotor units may not be completely aligned in the circumferential direction C of the motor rotor, so that the magnets 2 and 3 of adjacent rotor units are partially staggered. The motor rotor formed by this structure is a so-called skew slot motor rotor.

[0061] iii. In the above specific embodiment, it is described that the split member 11 is formed with a mounting protrusion 11p and the mounting member 12 is formed with a mounting groove 12h, but the present application is not limited thereto. As long as the split member 11 can be mounted on the mounting member 12, other solutions can be adopted. For example, one of the split member 11 and the mounting member 12 is formed with a mounting groove, and the other of the split member 11 and the mounting member 12 is formed with a mounting protrusion that matches the mounting groove, and the split member 11 is mounted on the mounting member 12 by matching the mounting protrusion with the mounting groove.

[0062] In addition, during the installation process of the mounting protrusions and the mounting grooves, it is not necessary to use connection methods such as bonding, welding or interference fit. The installation and fit of the split component 11 and the mounting component 12 can be achieved by simply inserting the mounting protrusion 11p into the mounting groove 12h. Of course, this application does not exclude these additional connection methods.

[0063] iv. It can be understood that in the present application, adjacent rotor units can share a mounting member 12 or use different mounting members 12 respectively.

[0064] v. It can be understood that in the present application, since all the split parts 11 can be stacked by using sheet-like laminates with the same structure, these sheet-like laminates have a small area and a regular shape, and thus when they are manufactured by the same stamping process, the utilization rate of the stamping material is improved, making the manufacturing of these split parts 11 simple and the manufacturing cost relatively low. Moreover, the split parts 11 and the mounting parts 12 can be installed with each other without using other mounting structures, so they are easy to assemble and the assembly cost is relatively low.

[0065] vi. In the present application, regardless of whether there is a gap between the first magnets 2 in each slot 1h or they are in contact with each other, these first magnets 2 are exposed from the radially outer opening and the radially inner opening of the slot 1h, so the magnetic isolation bridge structure formed by the rotor body 1 (or rotor core) may not be provided in the technical solution of the present application. The motor rotor of the present application has less magnetic leakage, so that it has a higher power density at the same speed.

[0066] vii. It is understood that the rotor body 1 (i.e., the split part 11, the mounting part 12), the first magnet 2, and the second magnet 3 can be fixed together by injecting a bonding material (an example of which can be polyphenylene sulfide, polyamide, or other materials), and then the carbon fiber sleeve 4 is wound. In this way, on the one hand, the bonding material can play a role in fixing the magnets, reducing the risk of the magnets shifting relative to the rotor body 1 or the split part 11 under the action of centrifugal force. On the other hand, this also facilitates the smooth progress of the process of winding the carbon fiber sleeve 4.

Claims

1. A motor rotor, characterized in that: include: A rotor body (1) formed as a whole in a cylindrical shape, the rotor body (1) comprising a plurality of rotor units stacked in an axial direction (A) thereof, each of the rotor units comprising a plurality of split parts (11) and a mounting part (12), the plurality of split parts (11) being evenly distributed at intervals in a circumferential direction (C) of the rotor body (1), the radial inner end of each of the split parts (11) being mounted on the mounting part (12), so that the plurality of split parts (11) and the mounting part (12) are relatively fixed at least in a radial direction of the rotor body (1), and a groove (1h) is defined between every two of the split parts (11) adjacent to each other in the circumferential direction (C); a first magnet (2) installed in the slot (1h) and fixed relative to the rotor body (1); and A carbon fiber sleeve (4) is formed into a cylindrical shape and covers the entire outer peripheral surface of the rotor body (1).

2. The motor rotor according to claim 1, characterized in that: The carbon fiber sleeve (4) is a cylindrical body formed by winding a carbon fiber strip on the outer peripheral surface of the rotor body (1).

3. The motor rotor according to claim 1 or 2, characterized in that: Each of the split parts (11) has the same fan-shaped structure and is made of a plurality of sheet-like laminated bodies stacked in the axial direction (A), and The mounting member (12) has an integral annular shape, and different split members (11) are mounted on different positions of the mounting member (12). Each of the rotor units includes one mounting member (12), or two or more rotor units share one mounting member (12).

4. The motor rotor according to claim 1 or 2, characterized in that: One of the split component (11) and the mounting component (12) is formed with a mounting groove (12h) extending along the axial direction (A), and the other of the split component (11) and the mounting component (12) is formed with a mounting protrusion (11p) matching with the mounting groove (12h), and the mounting protrusion (11p) and the mounting groove (12h) are matched and installed together, so that the split component (11) and the mounting component (12) cannot be separated in the radial direction.

5. The motor rotor according to claim 4, characterized in that: The installation groove (12h) is a dovetail groove.

6. The motor rotor according to claim 3, characterized in that: The split component (11) is formed with a plurality of limiting convex ribs (112) on its circumferential side wall, and the limiting convex ribs (112) extend along the axial direction (A) to radially limit the first magnet (2).

7. The motor rotor according to claim 1 or 2, characterized in that: A plurality of the first magnets (2) are accommodated and mounted in each of the grooves (1h), and the plurality of the first magnets (2) are arranged in the radial direction.

8. The motor rotor according to claim 7, characterized in that: The first magnets (2) adjacent to each other in the radial direction are spaced apart from each other; or The first magnets (2) adjacent to each other in the radial direction are in contact with each other and fixed together by bonding.

9. The motor rotor according to claim 1 or 2, characterized in that: It also includes a second magnet (3), each of the split parts (11) is formed with a magnet slot (11h1) penetrating along the axial direction (A), and the second magnet (3) is inserted and installed in the magnet slot (11h1).

10. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 9.

Images