WO2023051608A1

WO2023051608A1 - Motor rotor, motor, vehicle and assembling method of motor rotor

Info

Publication number: WO2023051608A1
Application number: PCT/CN2022/122124
Authority: WO
Inventors: Renlong YING; Xing HUO; Bingbing XIA; Binhong LIAO; Peng DUAN; Wei Zhu; JinJin LIU; Long HAN; Zhixin Yu; Zhongxian CHEN
Original assignee: Valeo Automotive ePowertrain Systems (Shanghai) Co., Ltd.
Priority date: 2021-09-28
Filing date: 2022-09-28
Publication date: 2023-04-06
Also published as: CN115882625A; EP4409726A1

Abstract

The present disclosure relates to a motor rotor, including a body extending along a rotation axis of a motor, the body being formed of a set of stacked sheets; and end plates provided at both ends of the body in a direction of the rotation axis to clamp the set of stacked sheets between the end plates; wherein the body is provided with a magnet mounting slot extending from one end to the other end of the body; and wherein at least one of the end plates is provided with a magnet introducing opening corresponding to the magnet mounting slot. The present disclosure also relates to a motor including the motor rotor and a vehicle including the motor. The present disclosure further relates to an assembling method of a motor rotor.

Description

MOTOR ROTOR, MOTOR, VEHICLE AND ASSEMBLING METHOD OF MOTOR ROTOR

TECHNICAL FIELD

The present disclosure relates to the field of motor, and more particularly to a motor rotor, a motor including the motor rotor, and a motor vehicle including the motor. The present disclosure also relates to an assembling method of a motor rotor.

BACKGROUND

At present, in the field of motor, the noise, vibration and harshness of the motor are important problems having impact on the performance of the motor, and also are common problems in existing motor products.

An existing motor rotor is usually formed of a set of stacked sheets, in which the sheets are tightly stacked to ensure the rigidity and strength of the components in the motor. Generally, these sheets are stacked to form a main body, then magnets are mounted in magnet slots of the main body and glue is filled in the magnet slots of the main body. After the glue is cured, end plates are assembled at both ends of the main body, and then the end plates and the main body are fixed together using fastening bolts. However, it is found that such structure and assembling method may cause some problems, which make the aforementioned problems of noise, vibration and harshness more obvious, and affect the performance of the motor. When the motor is operating at a high speed, the rotor will reach a very high temperature, and then the cured glue will be softened, so that the compressional force fixing the stacked sheets tightly will be decreased or even disappeared, the gap between the stacked sheets will become larger, the fastening bolts will be loosened, and the clamping force applied on the stacked sheets by the end plates will be decreased or even disappeared, thus causing more obvious vibration and noise during the high-speed rotation of the motor.

Therefore, there is a need for a motor rotor and an assembling method thereof, which can maintain high rigidity and high strength under high temperature of the rotor during high-speed rotation.

SUMMARY

The objective of the present disclosure is to provide a motor rotor to solve the above technical problems, which can maintain high rigidity and high strength under high temperature of the motor rotor during high-speed rotation, thereby relieving the problems of noise, vibration and harshness of the motor, and thus improving the performance of the motor.

The motor rotor according to the present disclosure includes: a body extending along a rotation axis of a motor, the body is formed of a set of stacked sheets; and end plates provided at both ends of the body in a direction of the rotation axis to clamp the set of stacked sheets between the end plates; wherein the body is provided with a magnet mounting slot extending from one end to the other end of the body, and wherein at least one of the end plates is provided with a magnet introducing opening corresponding to the magnet mounting slot.

In the present disclosure, by assembling and fixing the stacked sheets and the end plates at both sides together before filling the glue and mounting the magnet, it ensures that the curing of the glue and the possible softening of the glue under high rotor temperature will not affect the pressing force of the stacked sheets, thus ensuring that the stacked sheets are still maintained in a tightly stacked state by good pressing force under high temperature of the motor rotor during high-speed rotation of the motor rotor, and the gap between the stacked sheets in the body will not be increased, which effectively enhances the structural strength and rigidity of the motor rotor, and effectively avoids the problems in the prior art that the pressing force is reduced, the clamping effect of the end plates is reduced, and the screw bolts are loosened in similar working environments which are caused by mounting the end plates after the glue is cured, thereby further improving the overall performance characteristics of the motor.

In one embodiment, the magnet introducing opening is configured such that glue is filled into the magnet mounting slot via the magnet introducing opening.

In one embodiment, the motor rotor further includes fasteners for clamping the set of stacked sheets between the end plates.

In one embodiment, the body includes fastener through holes, the end plates include fastener mounting holes corresponding to the fastener through holes, and the fasteners pass through the fastener through holes and the fastener mounting holes.

In one embodiment, the fasteners are screw bolts.

In one embodiment, the end plates provided on both ends of the body both are provided with the magnet introducing opening. In this way, the end plates can be manufactured in a standardized way, and the manufacturing cost is saved.

The present disclosure also relates to a motor including the motor rotor described above.

Further, the present disclosure also relates to a vehicle including the motor described above. The vehicle may be an electric vehicle or a hybrid vehicle.

The present disclosure also relates to an assembling method of a motor rotor including: providing a body which extends along a rotation axis of a motor and is formed of a set of stacked sheets, wherein the body is provided with a magnet mounting slot extending from one end to the other end of the body; providing end plates which are provided on both ends of the body along a direction of the rotation axis to clamp the set of stacked sheets between the end plates, wherein at least one of the end plates is provided with a magnet introducing opening corresponding to the magnet mounting slot; and providing a magnet and introducing the magnet into the magnet mounting slot through the magnet introducing opening in the end plate.

In one embodiment, the assembling method further includes: filling glue into the magnet mounting slot via the magnet introducing opening before the step of introducing the magnet into the magnet mounting slot through the magnet introducing opening in the end plate.

In one embodiment, the assembling method further includes: filling glue into the magnet mounting slot via the magnet introducing opening after the step of introducing the magnet into the magnet mounting slot through the magnet introducing opening in the end plate.

In one embodiment, the assembling method further includes: providing fasteners for clamping the set of stacked sheets between the end plates.

In one embodiment, the fasteners pass through fastener through holes in the body and fastener mounting holes in the end plate corresponding to the fastener through holes.

DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings necessary for the explanations of the embodiments will be briefly described in the following; it is obvious that the described drawings below are only related to some embodiments of the present disclosure, and for those ordinary skilled in the art, other drawings can be obtained according to these drawings without creative labors. The following drawings are not deliberately drawn according to actual scale, but the emphasis is on showing the concept of the present disclosure.

Fig. 1 shows a schematic perspective view of a motor rotor according to the present disclosure;

Fig. 2 shows a schematic view of the motor rotor according to the present invention as viewed from a side of an end plate provided with a magnet introducing opening in a direction of a rotation axis;

Fig. 3 shows a schematic perspective view of the motor rotor according to the present invention after the end plates are removed; and

Fig. 4 shows a front view of one of the end plates of the motor rotor according to the present invention.

DETAILED DESCRIPTION

Hereinafter, the technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the drawings. Apparently, the described embodiments are just a part but not all of the embodiments of the disclosure. Based on the described embodiments herein, those skilled in the art can obtain other embodiment (s) , without any inventive work, which should be within the scope of the disclosure.

In the present disclosure, 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 perspective view of a motor rotor 1 according to the present disclosure, showing an end plate at a driving side of the motor rotor 1. Fig. 2 shows a schematic view of the motor rotor 1 as viewed from a side of the end plate 20 provided with a magnet introducing opening in a direction of a rotation axis X. The motor rotor 1 can be mounted in a motor housing of a vehicle motor (not shown) , 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 a rotation axis X of the motor, and the rotor temperature can reach 150℃. In order to better explain the technical solution according to the present disclosure, in the drawings of the present disclosure, the motor shaft is not shown which extends through the center of the motor rotor 1 along the rotation axis X.

As shown in Fig. 1, the motor rotor 1 may include a body 10. An The body 10 has a cylindrical overall external shape (Fig. 2) , and the body 10 extends along the rotation axis X of the motor and rotates around the rotation axis X during working. The body 10 is formed of a set of stacked sheets. These stacked sheets are tightly stacked together with sufficient pressing force to ensure the rigidity and strength of the motor rotor. In order to ensure that the stacked sheets can still be tightly held at high temperature during the high-speed rotation of the motor,

end plates

20 and 30 are provided at both ends of the body 10 in the direction of the rotation axis X, for clamping the set of stacked sheets between the two

end plates

20 and 30.

The

end plates

20 and 30 may have a disc shape, corresponding to a circular shape of the body 10 in a radial plane.

In order to clamp the stacked sheets between the two

end plates

20 and 30, the motor rotor 1 further includes a fastener 40. The motor rotor 1 may include a plurality of fasteners 40 which may have an elongated shape. In an example of the present disclosure, the fastener 40 may be a screw bolt.

Accordingly, the end plate 20 includes a fastener mounting hole 240, as shown in Figs. 2 and 4. The end plate 30 also includes a fastener mounting hole (not shown in the figures) . Further, the body 10 includes a fastener through hole 140. The fastener mounting holes of the

end plates

20 and 30 are through holes penetrating through the thickness of the end plates. Here, the thickness refers to the dimension of the end plate in the direction of the rotation axis X. The fastener through hole 140 of the body 10 may be a through hole extending through the body 10 from one end to the other end thereof in the direction of the rotation axis X. The fastener mounting hole 240 of the end plate 20, the fastener mounting hole of the end plate 30 and the fastener through hole 140 of the body 10 are in one-to-one correspondence with each other in the direction of the rotation axis X, and are communicated with each other to form a hollow space for the fastener to pass therethrough.

In the assembling process, firstly, the fastener 40 passes through the fastener mounting hole 240 of the end plate 20 from one side of the end plate 20, then passes through the corresponding fastener through hole 140 of the body 10, and finally extends out of the fastener mounting hole of the end plate 30 to be fixed at the outside of the end plate 30. For example, if the fastener is a screw bolt, it can be fixed by fixing a screw nut at the other end of the screw bolt. Thereby, the body 10 and the

end plates

20, 30 at both ends of the body 10 are firmly assembled together, and the

end plates

20 and 30 clamp the stacked sheets therebetween with sufficient pressing force.

The end plate may have a central recess 260 at a side thereof facing the outside, thereby saving manufacturing materials and reducing the weight of the motor rotor.

Fig. 3 shows another schematic perspective view of the motor rotor 10, in which the

end plates

20 and 30 at both ends of the body 10 are removed. As shown in Fig. 3, in order to mount the

magnets

111 and 121 in the body 10, the body 10 is provided with

magnet mounting slots

110 and 120. The

magnet mounting slots

110 and 120 extend from one end to the other of the body 10, and may be through holes extending through the body 10 along the rotation axis X. In the example shown in Fig. 3, in a radial plane perpendicular to the rotation axis X, the

magnet mounting slots

110 and 120 have a generally elongated trapezoidal shape but may have different lengths and widths, which can be set as required. The

magnet mounting slots

110 and 120 can be arranged in groups. In the example shown in Fig. 3, there are total eight groups each including two magnet mounting slots 110 and two magnet mounting slots 120, with one fastener through hole 140 arranged between every adjacent two groups. A plurality of groups of magnet mounting slots and a plurality of fasteners can be evenly distributed in the body 10 around the rotation axis X.

The magnet 111 is mounted in the magnet mounting slot 110, and the magnet 121 is mounted in the magnet mounting slot 120. In the process of mounting the permanent magnets, a plurality of

magnets

111 and 121 can be sequentially inserted into the

magnet mounting slots

110 and 120 along the direction of the rotation axis X. The permanent magnet may have a substantially rectangular parallelepiped form.

In the present disclosure, before the

magnets

111 and 121 are mounted in the body 10 of the motor rotor 1 and before the glue is filled into the

magnet mounting slots

110 and 120 of the body 10, the stacked sheets forming the body and the

end plates

20, 30 at both ends thereof have been tightly fixed together by fasteners 40.

In the motor rotor according to the present disclosure, at least one of the end plates, the end plate 20 at the driving side in the example shown in the figures, is provided with

magnet introducing openings

210, 220 corresponding to the

magnet mounting slots

110, 120, respectively. The magnet introducing opening 210 is communicated with the magnet mounting slot 110 in the direction of the rotation axis X, and the magnet introducing opening 220 is communicated with the magnet mounting slot 120 in the direction of the rotation axis X, so that the permanent magnets can be inserted into the corresponding

magnet mounting slots

110, 120 through the

magnet introducing openings

210, 220 in the end plate.

In order to fix the permanent magnets in the

magnet mounting slots

110, 120 of the body, it needs to fill glue into the magnet mounting slots. In the present disclosure, the

magnet introducing openings

210, 220 may be configured such that glue is filled into the corresponding

magnet mounting slots

110, 120 via the

magnet introducing openings

210, 220. As shown in Fig. 2, there is a space between the

permanent magnets

111, 121 and the inner walls of the corresponding

magnet mounting slots

110, 120. The

magnet introducing openings

210, 220 may have a substantially oblong shape in a radial plane. When viewed in the radial plane, the area occupied by the

magnet introducing openings

210, 220 of the end plate 20 may have an overlapping part with the space between the permanent magnet and the inner wall of the magnet mounting slot, as shown in Fig. 2, thereby allowing glue to enter the corresponding

magnet mounting slots

110, 120 via the

magnet introducing openings

210, 220.

In one embodiment, when the body 10, the

end plates

20 and 30 at both sides thereof and the permanent magnets are assembled in place, glue can be poured through the

magnet introducing openings

210 and 220 in the end plate 20, and then flows into the space between the inner walls of the

magnet mounting slots

110, 120 in the body 10 and the

permanent magnets

111, 121. After the glue is cured, the permanent magnets are fixed in place.

In another embodiment, the body 10 and the

end plates

20, 30 at both sides thereof have been assembled in place. At this time, glue is poured into the permanent

magnet mounting slots

110 and 120 of the body via the

magnet introducing openings

210 and 220 in the end plate 20, and then the

permanent magnets

111 and 121 are inserted into the corresponding permanent

magnet mounting slots

110 and 120 via the corresponding

magnet introducing openings

210 and 220. After the glue is cured, the permanent magnets are fixed in place. This makes it possible to avoid the technical problems such as generation of bubble, slow filling speed of glue, or difficulty for glue to reach the other end of the magnet mounting slot, which may be caused by filling the glue after mounting the magnets. Therefore, it has advantages in mass production.

In the present disclosure, by assembling and fixing the stacked sheets and the end plates at both sides together before filling the glue and mounting the magnets, it ensures that the stacked sheets are still maintained in a tightly stacked state by good pressing force under high temperature (e.g., 150℃) during the high-speed rotation of the motor rotor, and the gap between the stacked sheets in the body will not be increased, which effectively enhances the structural strength and rigidity of the motor rotor, and effectively avoids the problems in the prior art that the pressing force is reduced, the clamping effect of the end plates is decreased, and the screw bolts are loosened in similar working environments which are caused by mounting the end plate after the glue is cured, thereby further improving the overall performance characteristics of the motor.

In an embodiment not shown, the

end plates

20 and 30 provided at both ends of the body 10 are both provided with the magnet introducing opening. At this time, the end plates mounted at both sides can be processed by the same method to reduce the manufacturing cost.

In addition, the body 10 may further have a balance hole 170 which may extend in the direction of the rotation axis X and in which a balance member for balancing the motor rotor 1 when rotating at a high speed may be provided. The balance member is, for example, a rod. Accordingly, the end plate 20 is provided with a balancing member introducing opening 270, so that the balancing member can enter the balancing hole 170 via the balancing member introducing opening 270.

The assembling method of the motor rotor 1 according to the present disclosure will be described below, which includes the following steps.

Step 1, providing a body 10 which, as described above, extends along a rotation axis X of a motor and is formed of a set of stacked sheets, wherein the body 10 is provided with

magnet mounting slots

110, 120 extending from one end to the other end thereof.

Step 2, providing

end plates

20, 30 which are provided respectively at both ends of the body 10 in a direction of the rotation axis X to clamp the set of stacked sheets between the

end plates

20 and 30, wherein at least one of the end plates, for example, the driving side end plate 20, is provided with

magnet introducing openings

210, 220 corresponding to the

magnet mounting slots

110, 120.

In one embodiment of the assembling method, step 3 includes: filling glue into the

magnet mounting slots

110, 120 via the

magnet introducing openings

210, 220. Then, step 4 includes: providing

magnets

111, 121, and introducing the magnets into the

magnet mounting slots

110, 120 through the

magnet introducing openings

210, 220 in the end plate 20.

In another embodiment of the assembling method, step 3 includes: introducing

magnets

111, 121 into the

magnet mounting slots

110, 120 through the

magnet introducing openings

210, 220 in the end plate 20. Then, step 4 includes: filling glue into the

magnet mounting slots

110, 120 via the

magnet introducing openings

210, 220.

The assembling method further includes: providing fasteners 40 for clamping the set of stacked sheets between the

end plates

20 and 30. For example, the fastener 40 can pass through the fastener through hole 140 in the body 10 and the fastener mounting hole 240 in the

end plates

20, 30 corresponding to the fastener through hole 140. The step of mounting the fastener can be performed after step 2 and before step 3.

According to another aspect of the present disclosure, a motor is provided, including the motor rotor as described above. It can realize the function of the motor rotor as mentioned above, and has the advantages as mentioned above.

According to yet another aspect of the present disclosure, a motor vehicle is provided, including the motor as described above.

The motor vehicle may be a plug-in hybrid electric vehicle, or it may also be a battery electric vehicle or other types of motor vehicles. Based on the above, the motor vehicle can realize the functions of the motor components and the motor as described above, and has the advantages as described above.

Some features, structures, or characteristics in one or more embodiments of the present disclosure may be combined appropriately.

Unless otherwise defined, all terms (including technical and scientific terms) used here have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the related art, and should not be interpreted in idealized or extremely formal meanings, unless explicitly defined as such here.

The above is an explanation of the present disclosure, but it should not be considered as a limitation thereto. Although several exemplary embodiments of the present disclosure have been described, those skilled in the art will easily understand that many modifications can be made to the exemplary embodiments without departing from the novel teaching and advantages of the present disclosure. Therefore, all these modifications are intended to be included in the scope of the present disclosure as defined in the claims. It should be understood that the above is an explanation of the present disclosure, and the present disclosure should not be regarded as limited to the specific embodiments as disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included in the scope of the present disclosure..

Claims

A motor rotor (1) , comprising:

a body (10) extending along a rotation axis (X) of a motor, the body (10) being formed of a set of stacked sheets;

end plates (20, 30) provided on both ends of the body (10) along a direction of the rotation axis (X) to clamp the set of stacked sheets between the end plates;

wherein the body (10) is provided with a magnet mounting slot (110, 120) extending from one end to the other end of the body, and

wherein at least one (20) of the end plates is provided with a magnet introducing opening (210, 220) corresponding to the magnet mounting slot.
The motor rotor as claimed in claim 1, wherein the magnet introducing opening (210, 220) is configured such that glue is filled into the magnet mounting slot (110, 120) via the magnet introducing opening.
The motor rotor as claimed in claim 1, wherein the motor rotor further comprises fasteners (40) for clamping the set of stacked sheets between the end plates.
The motor rotor as claimed in claim 3, wherein the body comprises fastener through holes (140) , the end plates comprise fastener mounting holes (240) corresponding to the fastener through holes, and the fasteners pass through the fastener through holes and the fastener mounting holes.
The motor rotor as claimed in claim 3 or 4, wherein the fasteners are screw bolts.
The motor rotor as claimed in claim 1 or 2, wherein the end plates provided on both ends of the body are provided with the magnet introducing opening.
A motor comprising the motor rotor as claimed in any one of claims 1 to 6.
A vehicle comprising the motor as claimed in claim 7.
An assembling method for a motor rotor, comprising:

providing a body which extends along a rotation axis of a motor and is formed of a set of stacked sheets, the body being provided with a magnet mounting slot extending from one end to the other end of the body;

providing end plates provided on both ends of the body along a direction of the rotation axis to clamp the set of stacked sheets between the end plates, at least one of the end plates being provided with a magnet introducing opening corresponding to the magnet mounting slot; and

providing a magnet such that the magnet is put into the magnet mounting slot through the magnet introducing opening in the end plate.
The assembling method as claimed in claim 9, further comprising filling glue into the magnet mounting slot via the magnet introducing opening before the step of putting the magnet into the magnet mounting slot through the magnet introducing opening in the end plate.
The assembling method as claimed in claim 9, filling glue into the magnet mounting slot via the magnet introducing opening after the step of putting the magnet into the magnet mounting slot through the magnet introducing opening in the end plate.
The assembling method as claimed in any of claims 9 to 11, further comprising providing fasteners for clamping the set of stacked sheets between the end plates.
The assembling method as claimed in claim 12, wherein the fasteners pass through fastener through holes in the body and fastener mounting holes in the end plate corresponding to the fastener through holes.