CN216530751U

CN216530751U - EPS has brush motor to fall and makes an uproar with magnetic shoe structure, stator assembly and motor

Info

Publication number: CN216530751U
Application number: CN202123320524.3U
Authority: CN
Inventors: 郇海芹; 邱高峰
Original assignee: Nidec Kaiyu Auto Electric Jiangsu Co Ltd
Current assignee: Nedco Kaiyu Automotive Appliances (Jiangsu) Co.,Ltd.
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-05-13
Anticipated expiration: 2031-12-27

Abstract

The utility model discloses a magnetic shoe structure for noise reduction of an EPS (electric power storage) brush motor, a stator assembly and a motor, wherein the magnetic shoe structure comprises magnetic shoe bodies with symmetrical structures, the inner surface and the outer surface of each magnetic shoe body are arc-shaped surfaces, the magnetic shoe bodies extend along the axial direction of the two arc-shaped surfaces, and the distance B between the central shafts of the two arc-shaped surfaces is equal to the maximum thickness D of the magnetic shoe bodies; the inner surface of the magnetic shoe body is an inner arc, the outer surface of the magnetic shoe body is an outer arc, and the diameters of the inner arc and the outer arc are equal. The utility model can improve the tooth socket torque and the counter potential harmonic content of the motor, has strong demagnetization resistance, has the function of noise reduction, and can improve the hand feeling and the driving comfort of drivers.

Description

EPS has brush motor to fall and makes an uproar with magnetic shoe structure, stator assembly and motor

Technical Field

The utility model relates to the technical field of motor design, in particular to a magnetic shoe structure for noise reduction of an EPS brush motor, a stator assembly and a motor.

Background

The EPS brush motor is used for an automobile power-assisted steering system, and is widely applied to the field of new energy automobiles due to the advantages of simple structure, small size, high response speed, low cost, reliable operation and the like. Along with the continuous promotion of the driver to the travelling comfort, also the requirements for safety, noise, vibration and the like in the vehicle driving process are higher and higher.

The EPS brush motor is installed in stator assembly with the magnetic shoe, as the magnetomotive force source, provides the magnetic flux for whole magnetic circuit, and the inner arc of magnetic shoe, outer arc are the not concentric circular arc, and in present magnetic shoe structure, the inner arc and the outer arc diameter of magnetic shoe are unequal, and the thickness and the eccentricity of magnetic shoe are unequal moreover. After the magnetic shoe in the state is installed and magnetized, the influence on the tooth space torque and the counter electromotive force harmonic content of the motor is great, the performance of the motor on a steering system is further influenced, and the magnetic shoe not only has a pause feeling in hand feeling, but also has great noise; in addition, because there is not the cutting in magnetic shoe both sides, if the width size is oversize then influence the defective rate that the magnetic shoe packed into the position circle process, consequently need design a neotype magnetic shoe structure and improve this problem urgently, promote navigating mate's travelling comfort.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems that in the prior art, the diameters of inner arcs and outer arcs of magnetic shoes are not equal, the thicknesses and the eccentric distances of the magnetic shoes are not equal, the magnetic shoes have great influence on the tooth space torque and the counter potential harmonic content of a motor, the performance of the motor on a steering system is further influenced, the hand feeling is not only in pause and frustration, but also large noise is generated, the utility model provides a magnetic shoe structure for noise reduction of an EPS brush motor, a stator assembly and a motor, and the problems are solved.

The utility model provides a magnetic shoe structure for noise reduction of an EPS (electric power steering) brush motor, which comprises a magnetic shoe body, wherein the inner surface and the outer surface of the magnetic shoe body are arc-shaped surfaces, the magnetic shoe body extends along the axial direction of the two arc-shaped surfaces, and the distance B between the central axes of the two arc-shaped surfaces is equal to the maximum thickness D of the magnetic shoe body; the inner surface of the magnetic shoe body is an inner arc, the outer surface of the magnetic shoe body is an outer arc, and the diameters of the inner arc and the outer arc are equal.

Furthermore, the magnetic shoe body has a symmetrical structure, and the central axes of the two arc-shaped surfaces are positioned in the symmetrical plane of the magnetic shoe body.

Furthermore, be located arcwall face both sides the side of magnetic shoe body is the side direction and connects the face, two the intersection line on side direction connection face place plane is located the inboard of magnetic shoe body, and two the contained angle A's of side direction connection face size is 90 +/-1.

Furthermore, the two lateral connecting surfaces are provided with cutting surfaces connected with the outer arcs.

Furthermore, the connecting positions of the two lateral connecting surfaces and the inner arc are provided with chamfers, and the radiuses of the two chamfers are equal.

The utility model also provides a stator assembly which comprises a positioning ring, a machine shell and the EPS brush motor noise reduction magnetic shoe structure, wherein the positioning ring is arranged in the machine shell, a cavity suitable for placing the rotor assembly is formed in the positioning ring, a plurality of mounting grooves are formed in the periphery of the positioning ring, and the EPS brush motor noise reduction magnetic shoe structure is arranged in the mounting grooves.

Furthermore, two opposite side surfaces of the mounting groove are provided with reinforcing ribs abutted to the side surfaces of the magnetic shoe body.

The utility model also provides a motor which comprises a rotor assembly and the stator assembly, wherein the rotor assembly is arranged in the positioning ring.

The utility model has the beneficial effects that:

(1) the magnetic shoe structure for noise reduction of the EPS brush motor, the stator assembly and the motor can improve the tooth space torque and the counter potential harmonic content of the motor, have strong demagnetization resistance, have a noise reduction function, and can improve the hand feeling and the driving comfort of drivers.

(2) According to the EPS brush motor noise reduction magnetic shoe structure, the stator assembly and the motor, the yield of the process of mounting the magnetic shoe structure into the positioning ring can be improved through the design of the cutting surfaces on two sides.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is an exploded schematic view of a motor according to the present invention;

FIG. 2 is an exploded view of the stator assembly of the present invention;

fig. 3 is a schematic structural view of a magnetic shoe for noise reduction of an EPS brush motor according to the present invention.

In the figure, 1, a magnetic tile body, 101, an inner arc, 102, an outer arc, 103, a lateral connecting surface, 1031, a cutting surface, 104, a chamfer, 2, a symmetrical surface, 3, a stator assembly, 301, a positioning ring, 3011, a mounting groove, 3012, a reinforcing rib, 302, a shell, 4 and a rotor assembly.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Example one

As shown in fig. 3, a magnetic shoe structure for noise reduction of an EPS brushed motor comprises a magnetic shoe body 1, wherein the inner surface and the outer surface of the magnetic shoe body are arc-shaped surfaces, the magnetic shoe body 1 extends along the axial direction of the two arc-shaped surfaces, and the distance B between the central axes of the two arc-shaped surfaces is equal to the maximum thickness D of the magnetic shoe body 1; the inner surface of the magnetic shoe body 1 is an inner arc 101, the outer surface of the magnetic shoe body 1 is an outer arc 102, and the diameters of the inner arc 101 and the outer arc 102 are equal.

As shown in fig. 3, the point O1 in the figure is the center of the inner arc 101, the point O2 is the center of the outer arc 102, the distance between the point O1 and the point O2 is the eccentricity B, when the diameters of the inner arc 101 and the outer arc 102 are equal, only the thickness D of the magnetic shoe body on the extension line of the O1O2 is equal to the distance B between the central axes of the two arc surfaces, so that the magnetic shoe body falls on the extension line of the O1O2, compared with the magnetic shoe structure which does not fall on the extension line of the O1O2, the magnetic shoe tooth space structure of the utility model can improve the torque and the counter potential harmonic content of the motor, has strong anti-demagnetization capability, and can reduce noise and improve the hand feeling and the riding comfort of the driver.

The side surfaces of the magnetic shoe body 1 positioned on two sides of the arc-shaped surface are lateral connecting surfaces 103, the two lateral connecting surfaces 103 are planes, the intersection line of the planes of the two lateral connecting surfaces 103 is positioned on the inner side of the magnetic shoe body 1, and the included angle A of the two lateral connecting surfaces 103 is 90 degrees +/-1 degrees.

In a further design, the magnetic shoe body 1 has a symmetrical structure, the central axes of the two arc-shaped surfaces are located in the symmetrical plane 2 of the magnetic shoe body 1, as shown in fig. 3, the connecting line O1O2 of the two central points is located in the symmetrical plane 2, and the magnetic shoe body 1 is symmetrical relative to the symmetrical plane 2, so that the thickness D of the magnetic shoe body 1 is the largest on the symmetrical plane 2, and when the diameters of the inner arc 101 and the outer arc 102 are equal, the size of the thickness D is equal to the size of the eccentricity B, and the magnetic shoe body 1 which is symmetrically arranged is more favorable for the uniform stress of the positioning ring 301.

Example two

In this embodiment, the improvement is made on the basis of the first embodiment, the two lateral connecting surfaces 103 are provided with the cutting surfaces 1031 connected with the outer arc 102, and the arrangement of the cutting surfaces 1031 can reduce the width of the outer ring of the magnetic shoe body 1, thereby avoiding the increase of the fraction defective of the finished product due to the fact that the magnetic shoe body 1 cannot be completely installed in the positioning ring 301 because the width of the magnetic shoe body 1 is large.

Preferably, chamfers 104 are arranged at the connecting positions of the two lateral connecting surfaces 103 and the inner arc 101, the radiuses of the two chamfers 104 are equal, and the chamfers 104 can enable the magnetic ring body to be inserted into the positioning ring 301 more easily.

EXAMPLE III

A stator assembly 3 is shown in figure 2 and comprises a positioning ring 301, a machine shell 302 and the EPS brush motor noise reduction magnetic shoe structure, wherein the positioning ring 301 is arranged in the machine shell 302, a cavity suitable for placing a rotor assembly 4 is formed in the positioning ring 301, a plurality of mounting grooves 3011 are formed in the periphery of the positioning ring 301, the EPS brush motor noise reduction magnetic shoe structure is arranged in the mounting grooves 3011, the mounting grooves 3011 are tightly matched with the magnetic shoe body 1, then the positioning ring 301 is arranged in the machine shell 302, and the machine shell 302 can further protect the outer ring of the magnetic shoe body 1.

Furthermore, two opposite side surfaces of the mounting groove 3011 are provided with reinforcing ribs 3012 abutting against the side surfaces of the magnetic shoe body 1, and the reinforcing ribs 3012 abut against the non-cutting parts of the lateral connecting surface 103, wherein the abutting means that the mounting groove 3011 provided with the reinforcing ribs 3012 is in interference fit with the magnetic shoe body 1.

Example four

An electric machine, as shown in fig. 1, includes a rotor assembly 4 and the above-mentioned stator assembly 3, the rotor assembly 4 is disposed in a positioning ring 301.

In the description of the present invention, it is to be understood that the terms "center", "width", "thickness", "upper", "lower", "inner", "outer", "axial", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a EPS has brush motor to fall and makes an uproar and use magnetic shoe structure which characterized in that: the magnetic shoe comprises a magnetic shoe body (1) with arc-shaped surfaces on the inner surface and the outer surface, wherein the magnetic shoe body (1) extends along the axial direction of the two arc-shaped surfaces, and the distance B between the central axes of the two arc-shaped surfaces is equal to the maximum thickness D of the magnetic shoe body (1);

the inner surface of the magnetic shoe body (1) is an inner arc (101), the outer surface of the magnetic shoe body (1) is an outer arc (102), and the diameters of the inner arc (101) and the outer arc (102) are equal.

2. The EPS has brush motor to fall and makes an uproar and use magnetic shoe structure of claim 1, characterized in that: the magnetic shoe body (1) is symmetrical in structure, and the central axes of the two arc-shaped surfaces are positioned in the symmetrical surface (2) of the magnetic shoe body (1).

3. The EPS has brush motor to fall and makes an uproar and use magnetic shoe structure according to claim 1 or 2, characterized in that: the side face of the magnetic shoe body (1) which is positioned on two sides of the arc-shaped face is a lateral connection face (103), two intersection lines of planes where the lateral connection faces (103) are positioned on the inner side of the magnetic shoe body (1), and the size of an included angle A of the lateral connection faces (103) is 90 degrees +/-1 degrees.

4. The EPS has brush motor to fall and makes an uproar and use magnetic shoe structure of claim 3, characterized in that: the two lateral connecting surfaces (103) have cutting surfaces (1031) which are connected to the outer arc (102).

5. The EPS has brush motor to fall and makes an uproar and use magnetic shoe structure of claim 3, characterized in that: and the connecting positions of the two lateral connecting surfaces (103) and the inner arc (101) are provided with chamfers (104), and the radiuses of the two chamfers (104) are equal.

6. A stator assembly, comprising: the EPS brush motor noise reduction magnetic shoe structure comprises a positioning ring (301), a machine shell (302) and the EPS brush motor noise reduction magnetic shoe structure as claimed in any one of claims 1 to 5, wherein the positioning ring (301) is arranged in the machine shell (302), a cavity suitable for placing a rotor assembly (4) is formed in the positioning ring (301), a plurality of mounting grooves (3011) are formed in the periphery of the positioning ring (301), and the EPS brush motor noise reduction magnetic shoe structure is arranged in the mounting grooves (3011).

7. The stator assembly of claim 6, wherein: two opposite side surfaces of the mounting groove (3011) are provided with reinforcing ribs (3012) abutted to the side surfaces of the magnetic shoe body (1).

8. An electric machine characterized by: comprising a rotor assembly (4) and a stator assembly (3) as claimed in claim 6 or 7, the rotor assembly (4) being arranged in the cage (301).