CN115912776A

CN115912776A - Balance disc for motor and motor

Info

Publication number: CN115912776A
Application number: CN202110987318.3A
Authority: CN
Inventors: 胡亮
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2023-04-04

Abstract

The application provides a balance disc and motor for motor, the balance disc includes disk body and fin, the fin is fixed in the disk body, the fin set up in the side surface of disk body, and protrusion in the side surface of disk body, the fin includes first fin and second fin, first fin includes first disturbance portion and second disturbance portion, first disturbance portion with second disturbance portion linear extension, second disturbance portion is followed the disk body radially extends, the extending direction of first disturbance portion with the extending direction of second disturbance portion is perpendicular, first fin with the second fin is in radially spaced apart first fin with form the edge between the second fin the clearance that the circumference of disk body extends.

Description

Balance disc for motor and motor

Technical Field

The application relates to a balancing disk for an electric machine and an electric machine.

Background

The permanent magnet synchronous motor is internally provided with the winding and the permanent magnet, and for the permanent magnet synchronous motor, the service life of the winding and the electromagnetic performance of the permanent magnet are influenced by temperature, so that the output power of the motor is limited. In order to stabilize the performance and increase the power density of the permanent magnet synchronous motor, the heat dissipation design of the permanent magnet synchronous motor is an important part.

As shown in fig. 1 and 2, an electric machine includes a rotor 1, a magnet 2, a stator 3, a cooling jacket 4, a balance disk 5, a housing 6, a cover 7, a shaft 8, and a bearing 9. The shell 6 and the cover 7 are connected together to form a motor cavity, the stator 3 is wound with a winding, and the rotor 1, the magnet 2, the stator 3, the cooling jacket 4 and the balance disc 5 are all installed in the motor cavity. The shaft 8 is supported and mounted to the housing 6 and the cover 7 by a bearing 9, the balance disk 5 and the rotor 1 are both connected to the shaft 8, the balance disk 5 and the rotor 1 rotate together with the shaft 8, the stator 3 is mounted radially outside the rotor 1, and the cooling jacket 4 is mounted radially outside the stator 3.

In the above motor, 3 heat transfer paths are included when the rotor 1 and the magnet 2 dissipate heat.

Path a: the heat is conducted to the stator 3 by convection using air in the air gap between the rotor 1 and the stator 3 and then to the cooling jacket 4 for heat dissipation.

And a path B: heat is conducted to the balance disc 5 and through the air inside the motor cavity to the housing 6 and the cover 7.

And a path C: heat is conducted to the shaft 8 and then to the housing 6 and the cover 7 through the bearing 9.

Through simulation, the motor was continuously operated at a rotation speed of 16000 rpm and a torque of 16 nm, and the average speed (speed on the cross section) of the air around the balance disk 5 in the motor cavity was only 6.1m/s. Thus, for the path B, only a small amount of heat is transferred from the functional components (the rotor 1, the magnets 2, the stator 3, and the windings) to the cooling components (the cooling jacket 4, the housing 6, and the cover 7) by the air. Resulting in a maximum temperature of 179 c for the balancing disk 5 and the rotor 1, which is much higher than the acceptable value.

Disclosure of Invention

The application aims at providing the balance disc for the motor, so that the heat dissipation performance of the motor is good.

The application also provides a motor.

The application provides a balance disc for a motor, the balance disc comprises a disc body and fins, the fins are fixed on the disc body, the fins are arranged on the side surface of the disc body and protrude out of the side surface of the disc body, the fins comprise a first fin and a second fin,

the first fin includes a first disturbance portion and a second disturbance portion, the first disturbance portion and the second disturbance portion linearly extend, the second disturbance portion extends in a radial direction of the tray body, an extending direction of the first disturbance portion is perpendicular to an extending direction of the second disturbance portion,

the first and second fins are spaced apart in the radial direction, and a gap extending in the circumferential direction of the disk body is formed between the first and second fins.

In at least one embodiment, the second fin is located radially outward of the first fin, the second perturbation is located radially inward of the first perturbation, and the gap is formed between the first perturbation and the second fin.

In at least one embodiment, the radially outer side surface of the first disturbance portion is an arc surface that protrudes toward the radially outer side of the disk body, and the arc surface extends along the circumferential direction.

In at least one embodiment, the projection of the second fin in the axial direction of the disk body is a circular arc.

In at least one embodiment, the second disturbance section extends from a central position in an extending direction of the first disturbance section.

In at least one embodiment, the fins further include a third fin located radially inward of the first fin, the first and third fins being spaced apart in the radial direction, the third fin being circular.

In at least one embodiment, the first fins protrude from the tray at a different height than the second fins protrude from the tray;

the height of the first fin protruding out of the tray body is larger than the height of the third fin protruding out of the tray body.

The application also provides a motor, which comprises the balance disc for the motor in any one of the technical schemes.

In at least one embodiment, the side surface of the balancing disk not provided with fins faces the rotor of the electric machine, and the side surface of the balancing disk provided with fins faces away from the rotor of the electric machine.

In at least one embodiment, the balance disk is provided in two, and the two balance disks are located on both axial sides of a rotor of the motor.

By adopting the technical scheme, the balance disc for the motor can have at least one of the following beneficial effects.

(1) The air flowing speed is high due to the disturbance of the fins, so that the heat in the motor is conducted to the shell and the cover through the air in the motor cavity, and the working temperature of the motor is reduced.

(2) The radiating area of the side face of the balance disc is increased through the fins, the area in contact with air is large, and the radiating speed of the balance disc is high.

(3) The balance disc is simple in structure, the heat dissipation effect can be improved only by replacing the balance disc for the existing motor, the operation is simple and convenient, and the optimization cost of the motor is low.

Drawings

Fig. 1 shows an enlarged sectional view of an electric machine.

Fig. 2 shows a schematic structural view of the balance disc of the motor of fig. 1.

Fig. 3 shows a schematic structural diagram of a balance disk according to an embodiment of the present application.

Fig. 4 shows a cross-sectional view of the balance disc of fig. 3.

Fig. 5 shows a front view of the balancing disk in fig. 3.

Description of the reference numerals

1 rotor 2 magnet 3 stator 4 cooling jacket

5 balance disc 500 disc body 501 fin 502 through hole 51 first fin 511 first perturbation part 5111 radial outer side 5112 radial inner side 512 second perturbation part 52 second fin 53 third fin

6 casing 7 cover 8 axle 9 bearing

The A axis R is radial to the C circumferential direction.

Detailed Description

In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. The protection scope of the present application shall be subject to the claims.

As shown in fig. 3 to 5, the present application proposes a balance disk (also sometimes referred to as a balance plate) for a motor, the balance disk 5 including a disk body 500 and fins 501, the disk body 500 having a circular ring shape, a through hole 502 through which a shaft passes being provided at the center of the disk body 500.

In the following description, if not particularly stated, the axial direction a refers to the axial direction of the disk body 500, the circumferential direction C refers to the circumferential direction of the disk body 500, and the radial direction R refers to the radial direction of the disk body 500.

The fins 501 are arranged on one side surface of the disc body 500, the fins 501 protrude out of the side surface of the disc body 500, and when the balance disc 5 rotates, the fins 501 can disturb air to enable the air to flow rapidly, so that heat dissipation of the balance disc 5 is facilitated. Moreover, since the fins 501 protrude from the side surface of the tray body 500, the fins 501 increase the heat dissipation area of the balance tray 5, thereby facilitating the heat dissipation of the balance tray 5. No fins are provided on the other side surface of the disc body 500 for contacting the rotor and/or the magnets of the motor to conduct heat of the rotor and/or the magnets to the balance disc 5.

The fins 501 include a first fin 51, a second fin 52, and a third fin 53, and the first fin 51, the second fin 52, and the third fin 53 all protrude from the side surface of the tray body 500.

The first fins 51 may be provided in plural, for example, the first fins 51 may be provided in 6, the plural first fins 51 are provided at regular intervals along the circumferential direction C of the balance disk 5, and a gap is provided between two adjacent first fins 51, so that air may pass through the gap between the two adjacent first fins 51. The projection of each first fin 51 in the axial direction a of the disc body 500 is "T" shaped, and the first fin 51 includes a first disturbance portion 511 and a second disturbance portion 512. First perturbation 511 and second perturbation 512 are connected together, alternatively first perturbation 511 and second perturbation 512 may be integrally formed. Both the first and

second perturbations portions

511, 512 extend linearly, and the extending direction of the first perturbation portion 511 and the extending direction of the second perturbation portion 512 are perpendicular (including substantially perpendicular). The second disturbance portion 512 is located radially inside the first disturbance portion 511, the second disturbance portion 512 extends in the radial direction R of the disc body, and the second disturbance portion 512 may point to the axial center of the balance disc 5. The length of the first perturbation portion 511 in the extending direction thereof is greater than the length of the second perturbation portion 512 in the extending direction thereof. The second disturbance portion 512 extends from the center position in the extending direction of the first disturbance portion 511. Thus, the first disturbance portion 511 is defined as the horizontal side of "T", and the second disturbance portion 512 is defined as the vertical side of "T".

The radially outer side surface 5111 of the first disturbance portion 511 may be a circular arc surface protruding radially outward, and the circular arc surface extends in the circumferential direction C of the disk body, so that the air receives less resistance when passing through the gap between the radially outer side surface 5111 and the second fin 52.

The radially inner side surface 5112 of the first perturbation portion 511 may be a plane, the extending direction of the second perturbation portion 512 is perpendicular to the radially inner side surface 5112 of the first perturbation portion 511, and the junction of the first perturbation portion 511 and the second perturbation portion 512 may be transited by a fillet.

The first fins 51 may disturb and accelerate the air flow, causing the air to flow in the axial direction a, the radial direction R, and the circumferential direction C to form an air flow. For example, when the balance disk 5 rotates, the air in the motor cavity may be branched by the first disturbing portion 511, so that a part of the air passes through the gap between the first disturbing portion 511 and the second fin 52, and another part of the air flows radially inside the first disturbing portion 511 and is disturbed and accelerated by the second disturbing portion 512, flows in the radial direction R, and then joins the air flowing along the outer peripheral surface of the third fin 53 and passes through the gap between the second disturbing portion 512 and the third fin 53. The gas flows in the radial direction R and the circumferential direction C can also generate a gas flow in the axial direction a during the flow, in particular when the gas flows merge or split.

As shown in fig. 4, in the thickness direction (axial direction a) of the balance disk 5, the height of the side surface of the first fin 51 protruding from the disk body 500 is different from the height of the side surface of the second fin 52 protruding from the disk body 500, and the height of the side surface of the first fin 51 protruding from the disk body 500 is different from the height of the side surface of the third fin 53 protruding from the disk body 500. Optionally, the height of the first fin 51 protruding from the side surface of the tray body 500 is greater than the height of the second fin 52 protruding from the side surface of the tray body 500, and the height of the first fin 51 protruding from the side surface of the tray body 500 is greater than the height of the third fin 53 protruding from the side surface of the tray body 500, so that the air turbulence effect is better.

The second fin 52 is located radially outward of the first fin 51, and the second fin 52 and the first fin 51 are spaced apart to form a gap extending in the circumferential direction C through which air can flow in the circumferential direction C.

The second fins 52 are provided in plural, and the number of the second fins 52 is the same as that of the first fins 51, for example, 6 second fins 52 are provided. The position of the second fin 52 corresponds to the position of the first fin 51 in the circumferential direction C. The plurality of second fins 52 are uniformly spaced along the circumferential direction of the balance disk 5, and a gap is provided between two adjacent second fins 52 so that air can pass through the gap between the two adjacent second fins 52. The projection of each second fin 52 along the axial direction a of the disc body 500 is a circular arc (that is, both the radial inner side surface and the radial outer side surface of the second fin 52 are circular arcs), and a circle of the circular arc is concentric with the circular ring formed by the disc body 500. The outer circumferential surface of the second fin 52 is flush with the outer circumferential surface of the tray body 500.

The third fin 53 is located radially inward of the first fin 51, and the third fin 53 and the first fin 51 are spaced apart to form a gap through which air can flow in the circumferential direction C. The third fins 53 have a circular ring shape concentric with the circular ring of the disc 500, and the inner diameter of the third fins 53 may be the same as the inner diameter of the through holes 502 so that the inner circumferential surfaces of the third fins 53 are flush with the inner circumferential surface of the disc 500.

The balance disc 5 can disturb air, so that the air flows rapidly, and the heat dissipation of the path B in the motor is promoted.

The heat radiation performance of the balance pan of the present application was investigated by simulating the heat radiation performance of the balance pan of the comparative example (shown in fig. 2) and the balance pan of the embodiment of the present application (shown in fig. 3 to 5). Through simulation, the motor continuously works at 16000 rpm and 16 nm torque, and the average speed (speed on the cross section) of the air around the balance disk 5 in the motor cavity is 22.9m/s, which is significantly larger than 6.1m/s of the comparative example.

TABLE 1

	Temperature of winding	Rotor temperature	Magnet temperature	Temperature of balance disc	Heat dissipation rate
						Comparative example	184℃	179℃	178℃	172℃	419W
This application	171℃	164℃	161℃	157℃	739W

The temperature in table 1 represents the maximum temperature of the component.

As can be seen from table 1, the maximum temperature of the balance pan of the embodiment of the present application is significantly reduced as compared with the balance pan of the comparative example, and the heat radiation performance of the balance pan of the present application is enhanced. The temperature of the winding, rotor and magnet parts inside the motor is also significantly reduced compared to the comparative example. The heat dissipation rate of the functional components (the rotor 1, the magnet 2, the stator 3 and the winding) of the motor to the cooling components (the cooling jacket 4, the shell 6 and the cover 7) is increased from 419 watts to 739 watts, and the heat dissipation rate of the motor is better, which is beneficial to the performance stability and the heat dissipation rate improvement of the motor. The heat dissipation rate refers to the amount of heat transferred from the functional part of the motor to the cooling part per unit time.

The balance disc in the motor shown in the figure 1 can be replaced by the balance disc, the existing motor can be stable in performance and improved in power through simple operation of replacing the balance disc.

The balance disc of the present application has the following advantageous effects.

(1) The air flowing speed is high due to the disturbance of the fins, so that heat is dissipated to the shell and the cover through the air in the motor cavity, and the working temperature of the motor is low.

(2) The fins enable the surface area of the side face of the balance disc to be large, the area of contact with air is large, and the heat dissipation speed of the balance disc is high.

The application also provides a motor, which comprises the balance disc for the motor, a rotor, a magnet, a stator, a cooling jacket, a shell, a cover, a shaft and a bearing. The shell and the cover are connected together to form a motor cavity, the stator is wound with a winding, and the rotor, the magnet, the stator, the cooling jacket and the balance disc are all arranged in the motor cavity. The shaft is supported and installed in shell and cover through the bearing, and balance disc and rotor all connect in the shaft, and balance disc and rotor can rotate along with the shaft together, and the stator is installed in the radial outside of rotor, and the cooling jacket is installed in the radial outside of stator. The side surface of the balancing disk, which is not provided with fins, faces the functional parts of the electrical machine (rotor, magnets, stator and windings) and can contact the rotor, the side surface of the balancing disk, which is provided with fins 501, faces away from the functional parts of the electrical machine. Two balancing discs may be mounted on either axial side of the rotor, with the fins 501 of the two balancing discs facing away from each other.

While the present application has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in this specification is for illustrative purposes and does not have any limiting meaning for the present application.

Claims

1. A balance disk for a motor, the balance disk comprising a disk body (500) and fins (501), the fins (501) being fixed to the disk body (500), the fins (501) being provided on a side surface of the disk body (500) and protruding from the side surface of the disk body (500), the fins (501) comprising first fins (51) and second fins (52),

the first fin (51) includes a first disturbance section (511) and a second disturbance section (512), the first disturbance section (511) and the second disturbance section (512) extend linearly, the second disturbance section (512) extends in a radial direction (R) of the tray body (500), an extending direction of the first disturbance section (511) is perpendicular to an extending direction of the second disturbance section (512),

the first fin (51) and the second fin (52) are spaced apart in the radial direction (R), and a gap extending in the circumferential direction (C) of the disc body (500) is formed between the first fin (51) and the second fin (52).

2. The balance disc for an electric machine according to claim 1, wherein the second fin (52) is located radially outside the first fin (51), the second perturbation (512) is located radially inside the first perturbation (511), and the gap is formed between the first perturbation (511) and the second fin (52).

3. The balance disc for an electric machine according to claim 2, wherein the radially outer side surface (5111) of the first perturbation portion (511) is an arc surface that protrudes toward the radially outer side of the disc body (500), the arc surface extending along the circumferential direction (C).

4. The balancing disc for electric machines according to claim 3, characterized in that the projection of the second fins (52) along the axial direction (A) of the disc body (500) is a circular arc.

5. The balance disc for an electric machine according to any of claims 1 to 4, wherein the second perturbation (512) extends from a central position in the direction of extension of the first perturbation (511).

6. The balancing disk for electric machines according to any one of claims 1 to 4, characterized in that the fins (501) further comprise third fins (53), the third fins (53) being located radially inside the first fins (51), the first fins (51) and the third fins (53) being spaced apart in the radial direction (R), the third fins (53) being circular.

7. Balancing disk for an electrical machine according to claim 6,

the height of the first fins (51) protruding out of the tray body (500) is larger than the height of the second fins (52) protruding out of the tray body (500);

the height of the first fin (51) protruding out of the tray body (500) is larger than the height of the third fin (53) protruding out of the tray body (500).

8. An electric machine comprising a balance disc for an electric machine as claimed in any one of claims 1 to 7.

9. The machine according to claim 8, characterized in that the side surface of the balancing disk not provided with fins (501) is facing towards the rotor of the machine, the side surface of the balancing disk provided with fins (501) facing away from the rotor of the machine.

10. An electric machine as claimed in claim 8 or 9, characterized in that the balancing discs are provided in two, two on either axial side of the rotor of the electric machine.