CN217563408U

CN217563408U - Motor rotor, motor and vehicle

Info

Publication number: CN217563408U
Application number: CN202220672261.8U
Authority: CN
Inventors: 应人龙; 段鹏; 谢西; J.韦罗特; 火星; 朱巍; 夏冰冰; 马煜
Original assignee: Valeo Automotive ePowertrain Systems Shanghai Co Ltd
Current assignee: Valeo eAutomotive Changshu Co Ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-10-11
Anticipated expiration: 2032-03-25

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 rotor, motor and vehicle

Technical Field

The utility model relates to an electric machine field, more specifically relate to an electric motor rotor, including this electric motor rotor's motor and include the motor vehicle of motor.

Background

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

Currently, the stator or rotor of an electric machine typically comprises a set of stacked sheets, which are stacked closely together to form a component having a high stiffness, thereby ensuring the overall stiffness and strength of the machine component. The body is formed after the lamination stack, and then the magnet is mounted in the magnet groove of the body and filled with glue, and the magnet is fixed by curing of the glue. In order to prevent the decrease in rigidity and strength caused by the increase in the gap between the stacked sheets during the operation of the motor, it is most common to provide end plates at both ends of the motor part and to fix the end plates to both ends of the set of stacked sheets using fasteners so that the stacked sheets maintain a tight arrangement when the motor is rotated at a high speed. However, since the magnet slots are covered by the end plates, the end plates must be assembled after the magnet insertion and glue curing is complete. Otherwise, it is difficult to insert the magnets and glue through the end plates. However, since the glue has solidified at this time, the clamping force of the end plate is mostly applied only to the glue, causing the glue to break. In addition, when the motor runs at a high rotating speed, the rotor reaches a very high temperature, the solidified glue is softened, the clamping force of the end plate is reduced or even disappears, the lamination gap is enlarged, and the fastening screw is loosened, so that more obvious vibration and noise are caused when the motor rotates at a 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 conveniently insert and fix magnets and maintain high stiffness and high strength at high rotor temperatures during high speed rotation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric motor rotor solves above-mentioned technical problem, and it can conveniently insert and fixed magnet and still can keep high rigidity and high strength under high rotor temperature during high-speed rotation, improves the motor from this with noise, vibration, noise roughness problem to improve the performance of motor.

According to the utility model discloses an electric motor rotor includes: a body extending along a rotational axis of the motor, the body being formed of 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.

In the present invention, the pressing force to keep the close arrangement of the stacked sheets when the motor rotates at a high speed is applied through the first pressing portion of the first fastener. The first abutment does not interfere with the insertion of the magnet and the pouring of glue in the body. Thus, when assembling the rotor, the stacked sheets of the main body may be tightly held by the fastening assembly, and then the magnets may be mounted and glue may be filled and cured. Therefore, the curing and possible softening of the glue can be ensured without influencing the extrusion force of the stacked sheets at high rotor temperature, so that the stacked sheets are kept in a tight stacking state by good extrusion force when the motor rotor is at high temperature during the high-speed rotation of the motor rotor, the gap of the stacked sheets in the main body part can not be increased, the structural strength and the rigidity of the motor rotor are effectively enhanced, and the problems that the torsional rigidity is reduced, the extrusion force is reduced, the clamping effect of the end plates is reduced and the bolts can be loosened in the similar working environment caused by the fact that the end plates are installed after the glue is cured in the prior art are effectively avoided, and the overall performance characteristic of the motor is further improved.

The rotor of an electric machine according to the invention can 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 invention, the first abutment is separate from the end portion.

According to the utility model discloses an embodiment, first portion of pressing is facing one side of main part is provided with dodges the groove, is used for dodging the edge of fastener through-hole. Therefore, the interference between the edge of the through hole of the fastener and the first pressing part can be avoided, and the contact area between the first pressing part and the main body is reduced.

According to an embodiment of the invention, said first abutment has a frustoconical shape.

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

According to an embodiment of the invention, the fastening assembly further comprises a second fastener provided at the second end of the rod-shaped portion and cooperating with the first fastener.

According to an embodiment of the invention, the second fastener has a second head and a second abutment radially enlarged with respect to the second head, the second abutment abutting against the main body.

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

According to an embodiment of the invention, the rotor is provided with no end plates on both sides of the main body.

The utility model discloses still relate to a motor including above-mentioned electric motor rotor.

Further, the utility model discloses still relate to a vehicle including above-mentioned motor.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without making creative efforts. The drawings are not intended to be scaled to scale, with emphasis instead being placed upon illustrating the principles of the invention.

Fig. 1 shows a schematic view of an electric machine rotor according to the invention from one side in the direction of the axis of rotation;

fig. 2A and 2B show a front view of a rotor of an electric machine according to the invention from both ends.

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

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

Throughout the drawings, the same or similar parts are indicated by the same reference numerals.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings of the embodiments of the present invention to carry out clear and complete description on the technical solution of the embodiments of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the words "a," "an," or "the" and similar referents in the specification and claims of the present application does not denote a limitation of quantity, but rather denotes the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item preceding the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. Axial refers to the direction along the axis of rotation X of the motor rotor, radial refers to the direction perpendicular to the axis of rotation X.

Fig. 1 shows a schematic view of an electric machine rotor 1 according to the invention from one side in 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), for example a permanent magnet motor. The vehicle may be an electric vehicle or a hybrid vehicle.

In the operating state, the rotor 1 of the electric machine rotates at high speed, up to tens of thousands of revolutions per minute, about the axis of rotation X of the electric machine. In order to better illustrate the solution according to the present invention, in the drawings of the present invention, the motor shaft is not shown, which extends along the rotation axis X through the center of the motor rotor 1.

As shown in fig. 1, the motor rotor 1 may include a main body 10. The body 10 has a cylindrical overall external shape, which extends along the rotation axis X of the motor and rotates about the rotation axis X in operation. The body 10 is formed of a set of stacked sheets. The stacked sheets are tightly stacked together with a sufficient pressing force to ensure the rigidity and strength of the motor rotor. In order to ensure that the stack of laminations is tightly held during high speed rotation of the motor, the motor rotor 1 further comprises a fastening assembly 40, the body being pressed together by the fastening assembly 40. The electric machine rotor 1 may comprise a plurality of fastening assemblies 40 evenly distributed around the rotation axis X.

Referring to fig. 2A-4, the body 10 includes a fastener through-hole 140, which may be a through-hole extending through the body 10 from one end of the body 10 to the other end thereof in the direction of the rotation axis X, forming a hollow space through which a fastener in the fastening assembly 40 passes. The 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 evenly distributed in the body 10 about the axis of rotation X, with a corresponding 8 fastener assemblies 40.

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

The first head 411 has an end 412 and a first abutment 413. The first pressing portion 413 presses against the main body. The end 412 of the first head 411 and the first abutment 413 are integrally formed. End 412 has a hexagonal shape to facilitate threading by a tool such as a wrench. The first abutment 413 has a frustoconical shape which increases radially from the end 412 towards the body 10. The first pressing portion 413 may disperse the pressing force to be applied over the entire bottom area thereof.

In addition, due to manufacturing limitations, a rounded transition is typically present where the first abutment 413 joins the stem 410. Such a transition portion may interfere with the edge of the fastener through hole 140, causing the first abutting portion 413 not to abut against the main body 10 with its entire bottom surface, impairing the gripping action of the fastening assembly 40 on the stacked pieces of the main body 10. For this, referring to fig. 4, an escape groove 415 is provided at a side of the first abutting portion 413 facing the main body 10 for escaping an edge of the fastener through hole 140, thereby ensuring that the first abutting portion 413 abuts against the main body 10 with the entire bottom surface thereof. The above structure can avoid stress concentration at the transition portion position while increasing the clamping effect of the fastening member 40 to 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 413 may be separate. That is, the first pressing portion 413 is an independent member. This can reduce the difficulty of manufacturing the first fastening member 41 and save raw materials. Similarly, the first abutment 413, which is a separate component, may also be provided with an escape groove on its side facing the main body 10.

The second fastener 42 has a second head 420 and a second abutment 421. The second pressing portion 421 presses against the main body 10 in a direction opposite to the first pressing portion 413. Therefore, the first pressing part 413 and the second pressing part 421 are respectively pressed against the main body 10 from both ends of the main body 10, thereby achieving clamping of the stacked sheets of the main body 10. Like 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 which increases radially from the second head portion 420 toward the main body 10, so that the pressing force to be applied is dispersed over the entire surface area thereof. Although not shown in the drawings, it is contemplated that the second head part 420 and the second pressing part 421 may be separated.

The main body 10 is also provided with a magnet mounting groove 110 for mounting a magnet 111. The magnet installation groove 110 extends from one end to the other end of the main body 10, 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 groove 110. In the example shown in fig. 1 to 2B, the main body 10 includes two kinds of magnet installation grooves 110 of different sizes for installing two kinds of magnets 111 of different sizes. The magnet mounting grooves 110 may be provided in groups, each group including 4 magnet mounting grooves 110 arranged in two inverted V shapes. The fastener through-holes 140 are disposed between two adjacent sets. The sets of magnet mounting slots may also be evenly distributed about the axis of rotation X in the main body 10.

The magnet 111 is installed in the magnet installation recess 110. In the process of mounting the permanent magnet, the plurality of magnets 111 may be sequentially inserted into the magnet mounting groove 110 in the direction of the rotation axis X. The permanent magnet may have a substantially rectangular parallelepiped form. In the present invention, the stacked sheets forming the main body 10 have been closely fixed together by the fastening assembly 40 before the magnet 111 is installed in the main body 10 of the motor rotor 1 and before glue is filled into the magnet installation groove 110 of the main body 10. Referring to fig. 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 portion 413 nor the second pressing portion 421 of the fastening assembly 10 covers the magnet mounting groove 111. Therefore, the first and second abutments do not constitute an obstacle to insertion of the magnet or pouring of glue in the magnet mounting groove 110. It is conceivable that one of the first and second abutments may not cover the magnet installation groove 111, or that at least one of the first and second abutments only covers an end portion of the magnet installation groove 111 and does not cover a portion for inserting the magnet 111.

The magnet 111 may be first inserted into the magnet installation groove 110, and then glue is poured into the magnet installation groove 110 and cured. Alternatively, the magnet 111 may be inserted after glue is poured into the magnet installation groove 110. After the glue is cured, the permanent magnet is fixed in place. This makes it possible to avoid technical problems such as generation of bubbles, slow filling speed of glue, or difficulty in reaching the other end of the magnet mounting groove by the glue refilled after the magnet is mounted, thereby being advantageous in terms of mass production.

The utility model discloses in, make the lamination piece pass through fastening assembly equipment together fixedly before filling glue and installation magnet, can ensure to pile up the piece still by good extrusion force keeping in inseparable stack state under high temperature (for example, 150 ℃) during electric motor rotor's high-speed rotation, lamination clearance in the main part can not increase, thereby the structural strength and the rigidity of electric motor rotor have been strengthened effectively, and effectively avoided among the prior art because glue solidification back presss from both sides tight the gluey fracture under similar operational environment that piles up the piece and cause again, arouse that rotor torsional rigidity is low, the extrusion force reduces, clamping action reduces, and the problem that the bolt can loosen, thereby the holistic performance characteristic of motor has further been improved.

According to another aspect of the utility model, a motor is proposed, this motor includes as before the electric motor rotor. Which can fulfil the function of a rotor of an electric machine as described above and has the advantages as described above.

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

The motor vehicle may be a Plug-in Hybrid Electric vehicle (Plug-in Hybrid Electric vehicle), or it may be a Battery Electric vehicle (Battery Electric vehicle) or other type of motor vehicle. Based on the above, the motor vehicle can realize the functions of the motor component and the motor as described above, and has the advantages as described above.

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

The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few 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 materially 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 claims. It is to be understood that the foregoing is illustrative of the present invention and that the invention is not to be considered limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the invention.

Claims

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.