CN217563408U - Motor rotors, motors and vehicles - Google Patents

Abstract

The utility model relates to an electric motor rotor, include: a body extending along a rotation axis X of the motor, the body being formed by a set of stacked sheets and provided with fastener through holes; a fastening assembly including a first fastener extending through a fastener through-hole in the body for gripping the set of stacked sheets. The first fastener includes a shaft and a first head at a first end of the shaft, the first head having an end and a first abutment radially enlarged relative to the end, the first abutment abutting against the body. The utility model discloses still relate to including electric motor rotor's motor and vehicle including the motor.

Description

Motor rotors, motors and vehicles

technical field

The utility model relates to the field of motors, and more particularly to a motor rotor, a motor including the motor rotor, and a motor vehicle including the motor.

Background technique

At present, in the field of motors, the noise, vibration, and noise roughness of motors are important issues that affect motor performance, and are also common problems in current motor products.

Currently, the stator or rotor of an electric motor typically includes a set of stacked sheets that are tightly stacked together to form a component with high stiffness, thereby ensuring the overall stiffness and strength of the motor components. After the laminations are stacked to form a body, the magnet is installed in the magnet groove of the body and the magnet groove of the body is filled with glue, and the magnet is fixed by curing the glue. In order to prevent the decrease of stiffness and strength due to the increase of the gap between the stacked sheets during the operation of the motor, the most common situation is to provide end plates at both ends of the motor components, and use fasteners to fix the end plates to the set of stacked sheets , so that the stacked sheets are still tightly arranged when the motor rotates at high speed. However, since the magnet slots are covered by the end plates, the end plates must be assembled after the magnets are inserted and the glue has cured. Otherwise, it will be difficult to insert the magnet and potting through the end plate. However, since the glue has cured at this time, most of the clamping force of the end plate is only applied to the glue, which will cause the glue to break. In addition, when the motor is running at high speed, the rotor will reach a very high temperature. At this time, the cured glue will soften, the clamping force of the end plate will decrease or even disappear, the lamination gap will become larger, and the fastening screws will also change. loose, which causes more obvious vibration and noise when the motor rotates at high speed. In addition, the use of additional components such as end plates also increases manufacturing costs, making the motor rotor prohibitively expensive.

Therefore, there is a need for a motor rotor that can easily insert and hold magnets while maintaining high stiffness and strength at high rotor temperatures during high-speed rotation.

Utility model content

The purpose of the present utility model is to propose a motor rotor to solve the above technical problems, which can easily insert and fix the magnet and can maintain high rigidity and high strength under high rotor temperature during high-speed rotation, thereby improving the performance of the motor. Noise, vibration, noise roughness problems, thereby improving the performance of the motor.

The motor rotor according to the present invention comprises: a main body extending along the axis of rotation of the motor, the main body being formed from a set of stacked sheets and provided with fastener through holes; a fastening assembly comprising a fastener extending through the main body A first fastener of the fastener through hole for clamping the set of stacked sheets. The first fastener includes a stem and a first head at a first end of the stem, the first head having an end and a first pressure that increases radially relative to the end A leaning portion, the first pressing portion is pressed against the main body.

In the present invention, the pressing force that keeps the stacked sheets tightly arranged when the motor rotates at a high speed is applied through the first pressing portion of the first fastener. The first pressing portion does not prevent the insertion of the magnet and the pouring of glue in the body. In this way, when the rotor is assembled, the stacked pieces of the main body can be tightly clamped by the fastening assembly, and then the magnets are installed and the glue is filled and cured. Therefore, it can be ensured that the curing of the glue and the possible softening at high rotor temperatures do not affect the pressing force of the stacked sheets, thereby ensuring that the stacked sheets are still well protected at high temperatures of the motor rotor during high-speed rotation of the motor rotor. The squeezing force is kept in a tightly stacked state, and the lamination gap in the main body will not increase, thereby effectively enhancing the structural strength and rigidity of the motor rotor, and effectively avoiding the installation of the end due to the curing of the glue in the prior art. The plate causes the problems of reduced torsional stiffness, reduced extrusion force, reduced clamping effect of the end plate, and loose bolts under similar working conditions, thereby further improving the overall performance characteristics of the motor.

The motor rotor according to the present invention may also have one or more of the following features alone or in combination.

According to an embodiment of the present invention, the end portion of the first head portion and the first pressing portion are integrally formed.

According to an embodiment of the present invention, the first pressing portion is separated from the end portion.

According to an embodiment of the present invention, a side facing the main body of the first pressing portion is provided with an escape groove for avoiding the edge of the fastener through hole. In this way, interference between the edge of the fastener through hole and the first pressing portion can be avoided, resulting in a reduction in the contact area between the first pressing portion and the main body.

According to an embodiment of the present invention, the first pressing portion has a frustoconical shape.

According to an embodiment of the present invention, the second end of the rod-shaped portion has a threaded portion.

According to an embodiment of the present invention, the fastening assembly further includes a second fastener disposed at the second end of the rod-shaped portion and matched with the first fastener.

According to an embodiment of the present invention, the second fastener has a second head and a second pressing portion radially enlarged relative to the second head, the second pressing portion pressing against the main body.

According to an embodiment of the present invention, the main body is provided with a magnet installation groove extending from one end to the other end of the main body, and the first pressing portion does not cover the magnet installation groove.

According to an embodiment of the present invention, the rotor is not provided with end plates on both sides of the main body.

The utility model also relates to a motor comprising the above-mentioned motor rotor.

Further, the present invention also relates to a vehicle including the above-mentioned motor.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, without creative work, other drawings can also be obtained from these drawings. The following drawings are not intentionally scaled and drawn according to the actual size, and the emphasis is to illustrate the gist of the present invention.

Fig. 1 shows the schematic diagram of the motor rotor according to the present invention viewed from one side along the direction of the rotation axis;

Figures 2A and 2B show a front view of the rotor of a motor according to the present invention from both ends.

Figure 3 shows a cross-sectional view of a portion of a rotor of an electric machine according to the present invention;

FIG. 4 is an enlarged view of the portion of FIG. 3 including the first head of the first fastener.

The same or similar parts are designated by the same reference numerals throughout the drawings.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

Unless otherwise defined, technical or scientific terms used herein should have the ordinary meaning as understood by one of ordinary skill in the art to which the present invention belongs. Words such as "a", "an" or "the" used in the description of the patent application for this utility model and the claims do not denote a quantitative limitation, but indicate that there is at least one. "Comprising" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. The axial direction refers to the direction along the rotation axis X of the motor rotor, and the radial direction refers to the direction perpendicular to the rotation axis X.

FIG. 1 shows a schematic view of the motor rotor 1 according to the present invention, viewed from one side along the direction of the axis of rotation X. The motor rotor 1 may be mounted in a motor housing of a vehicle motor (not shown in the figures), such as a permanent magnet motor. The vehicle may be an electric vehicle or a hybrid vehicle.

In the working state, the motor rotor 1 rotates at a high speed around the rotation axis X of the motor, and its rotational speed can be as high as tens of thousands of revolutions per minute. In order to better illustrate the technical solution according to the present invention, in the drawings of the present invention, the motor shaft is not shown, and the motor shaft extends through the center of the motor rotor 1 along the axis of rotation X.

As shown in FIG. 1 , the motor rotor 1 may include a main body 10 . The body 10 has a cylindrical general outer shape which extends along the axis of rotation X of the electric machine and rotates about the axis of rotation X in operation. The body 10 is formed from a set of stacked sheets. These stacked sheets are tightly stacked with sufficient pressing force to ensure the rigidity and strength of the motor rotor. In order to ensure that the stacked sheets can be held tightly during the high-speed rotation of the motor, the motor rotor 1 also includes a fastening assembly 40 by which the bodies are pressed together. The motor rotor 1 may comprise a plurality of fastening assemblies 40 evenly distributed around the axis of rotation X.

2A-4, the main body 10 includes a fastener through hole 140, which may be a through hole extending from one end of the main body 10 in the direction of the rotation axis X through the main body 10 to the other end thereof, forming a fastener assembly 40. The hollow space through which the fasteners pass. The main body 10 may include a plurality of fastener through holes 140 , in the example shown in FIG. 1 , a total of 8 fastener through holes 140 are evenly distributed in the main body 10 around the rotation axis X, correspondingly having 8 fastener through holes 140 . A fastening assembly 40 .

Fastening assembly 40 includes first fastener 41 and second fastener 42 . The first fastener 41 includes a rod-shaped portion 410 and a first head portion 411 located at a first end of the rod-shaped portion 410 . The rod-shaped portion 410 of the first fastener 41 passes through the corresponding fastener through hole 140 of the main body 10 on one side and protrudes from the other side. That is, the first end and the second end of the rod-shaped portion 410 are located on both sides of the main body 10, respectively. At the second end of the rod portion 410, a second fastener 42 cooperates with the first fastener 41 to press the stacked pieces of the main body 10 together. For example, in the case where the first fastener 41 is a bolt, the second end of the rod-shaped portion 410 has a threaded portion, and the second fastener 42 is a nut screwed to the threaded portion.

The first head portion 411 has an end portion 412 and a first pressing portion 413 . The first pressing portion 413 is pressed against the main body. The end portion 412 of the first head portion 411 and the first pressing portion 413 are integrally formed. The end 412 has a hexagonal shape to facilitate screwing by means of a wrench or the like. The first pressing portion 413 has a frustoconical shape that radially increases from the end portion 412 toward the main body 10 . The first pressing portion 413 can disperse the pressing force to be applied over the entire bottom area thereof.

In addition, due to the limitation of the manufacturing process, a rounded transition portion usually occurs at the connection between the first pressing portion 413 and the rod-shaped portion 410 . Such a transition portion may interfere with the edge of the fastener through hole 140 , so that the first pressing portion 413 cannot press against the main body 10 with its entire bottom surface, thereby impairing the clamping effect of the fastening assembly 40 on the stacked pieces of the main body 10 . To this end, referring to FIG. 4 , a side facing the main body 10 of the first pressing portion 413 is provided with an escape groove 415 for avoiding the edge of the fastener through hole 140 , thereby ensuring that the first pressing portion 413 is free from Its entire bottom surface is pressed against the main body 10 . The above structure can avoid stress concentration at the position of the transition portion, and at the same time increase the clamping effect of the fastening component 40 on the stacked sheets of the main body 10 .

Although not shown in the drawings, it is contemplated that the end portion 412 and the first abutment portion 413 may be separate. That is, the first pressing portion 413 is an independent member. This can reduce the difficulty of manufacturing the first fastener 41 and save raw materials. Similarly, the first pressing portion 413 as an independent component may also be provided with an escape groove on the side thereof facing the main body 10 .

The second fastener 42 has a second head portion 420 and a second pressing portion 421 . The second pressing portion 421 is pressed against the main body 10 , and its direction is opposite to the first pressing portion 413 . Therefore, the first pressing portion 413 and the second pressing portion 421 press against the main body 10 from both ends of the main body 10 respectively, thereby realizing the clamping of the stacked sheets of the main body 10 . Similar to the first pressing portion 413, the second head portion 420 and the second pressing portion 421 are also integrally formed. The second head 420 has a hexagonal shape, so as to facilitate screwing by a tool such as a wrench. The second pressing portion 421 has a frustoconical shape that radially increases from the second head portion 420 toward the main body 10 so as to disperse the pressing force to be applied over the entire surface area thereof. Although not shown in the drawings, it is contemplated that the second head portion 420 and the second pressing portion 421 may be separate.

The main body 10 is also provided with a magnet mounting slot 110 for mounting the magnet 111 . The magnet mounting slot 110 extends from one end of the main body 10 to the other end, and may be a through hole extending through the main body 10 along the rotation axis X. The magnet 111 is installed in the magnet installation slot 110 . In the examples shown in FIGS. 1 to 2B , the main body 10 includes two types of magnet mounting slots 110 of different sizes for installing two types of magnets 111 of different sizes. The magnet mounting slots 110 may be provided in groups, each group including four magnet mounting slots 110 arranged in two inverted V-shapes. Fastener through holes 140 are arranged between two adjacent groups. Multiple sets of magnet mounting slots may also be evenly distributed around the axis of rotation X in the body 10 .

The magnet 111 is installed in the magnet installation slot 110 . During the process of installing the permanent magnet, the plurality of magnets 111 may be sequentially inserted into the magnet installation slot 110 along the direction of the rotation axis X. The permanent magnets may have the form of a generally cuboid. In the present invention, before the magnets 111 are installed in the main body 10 of the motor rotor 1 and before glue is filled into the magnet installation grooves 110 of the main body 10 , the stacked sheets forming the main body 10 have been tightly secured by the fastening assembly 40 fixed together. 2A and 2B, the motor rotor according to the present invention is not provided with end plates at both ends of the main body 10, and neither the first pressing part 413 nor the second pressing part 421 of the fastening assembly 10 covers the magnets Mounting slot 111 . Therefore, the first pressing portion and the second pressing portion do not constitute an obstacle to inserting the magnet into the magnet mounting groove 110 or pouring glue. It is conceivable that one of the first pressing portion and the second pressing portion does not cover the magnet mounting groove 111, or at least one of the first pressing portion and the second pressing portion can be arranged. Only the end portion of the magnet mounting groove 111 is covered, and the portion for inserting the magnet 111 is not covered.

The magnet 111 can be inserted into the magnet installation groove 110 first, and then glue is poured into the magnet installation groove 110 and the glue is cured. Optionally, glue can also be poured into the magnet installation slot 110 first, and then the magnet 111 is inserted. After the glue has cured, the permanent magnets are held in place. This makes it possible to avoid technical problems such as the generation of air bubbles that may be caused by refilling the glue after the magnet is installed, the slow filling speed of the glue, or the difficulty of the glue reaching the other end of the magnet installation slot, which has advantages in mass production.

In the present invention, the stacked sheets are assembled and fixed together by the fastening components before filling the glue and installing the magnets, which can ensure that the stacked sheets are still well squeezed under high temperature (for example, 150° C.) during the high-speed rotation of the motor rotor. The pressure is kept in a tight stacking state, and the lamination gap in the main body will not increase, thereby effectively enhancing the structural strength and rigidity of the motor rotor, and effectively avoiding the prior art due to the glue curing and then clamping and stacking The glue is broken under similar working conditions caused by the sheet, which causes the problems of low torsional stiffness of the rotor, reduced extrusion force, reduced clamping effect, and loose bolts, thereby further improving the overall performance characteristics of the motor.

According to another aspect of the present invention, a motor is proposed, which includes the aforementioned motor rotor. It can realize the function of the motor rotor as mentioned above, and has the advantages mentioned above.

According to another aspect of the present invention, a motor vehicle is proposed, comprising an electric machine as previously described.

The motor vehicle may be a plug-in hybrid electric vehicle (Plug-in Hybrid Electric vehicle), or it may also be a battery electric vehicle (Battery Electric vehicle) or other types of motor vehicles. Based on the above, the motor vehicle can realize the functions of the aforementioned motor components and motors, and has the aforementioned advantages.

Certain features, structures or characteristics of the one or more embodiments of the present invention may be combined as appropriate.

The above is an illustration of the present invention and should not be considered as a limitation thereof. While several exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the appended claims. It is to be understood that the above is a description of the present invention and that the present invention should not be construed as limited to the particular embodiments disclosed, and that modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the present invention .

Claims (12)

1. An electric machine rotor (1) comprising:

a body (10) extending along a rotation axis (X) of the machine, the body (10) being formed by a set of stacked sheets and provided with fastener through holes (140);

a fastening assembly (40) including a first fastener (41) extending through a fastener through-hole (140) in the body for gripping the set of stacked sheets;

characterized in that said first fastening member (41) comprises a shaft (410) and a first head (411) at a first end of the shaft (410), said first head (411) having an end (412) and a first abutment (413) radially enlarged with respect to said end (412), said first abutment (413) being pressed against said main body (10).

2. An electric machine rotor (1), according to claim 1, characterised in that the end (412) of the first head (411) and the first abutment (413) are formed integrally.

3. Electric machine rotor (1) according to claim 1, characterized in that the first abutment (413) is separate from the end (412).

4. An electric machine rotor (1) according to any of claims 1-3, characterized in that the first abutment (413) is provided with an avoidance groove (415) at a side facing the main body (10) for avoiding an edge of the fastener through hole (140).

5. An electric machine rotor (1) according to any of claims 1-3, characterized in that the first abutment (413) has a frustoconical shape.

6. An electric machine rotor (1) according to any of claims 1-3, characterized in that the second end of the rod-shaped part (410) has a threaded part (414).

7. An electric machine rotor (1) according to any of claims 1-3, characterized in that the fastening assembly (40) further comprises a second fastening member (42) provided at a second end of the rod-shaped portion (410) and cooperating with the first fastening member (41).

8. Electric machine rotor (1) according to claim 7, characterized in that said second fastening member (42) has a second head (420) and a second abutment (421) radially enlarged with respect to the second head (420), said second abutment (421) being pressed against said main body (10).

9. The electric machine rotor (1) according to any of claims 1 to 3, characterized in that the main body (10) is provided with a magnet mounting groove (110) extending from one end to the other end of the main body (10), the first pressing part (413) not covering the magnet mounting groove (110).

10. An electric machine rotor (1) according to any of claims 1-3, characterized in that the rotor (1) is provided with no end plates on both sides of the body (10).

11. An electric machine, characterized in that the electric machine comprises an electric machine rotor (1) according to any one of claims 1-10.

12. A vehicle, characterized in that the vehicle comprises an electric machine according to claim 11.

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