WO2020063536A1

WO2020063536A1 - Vehicle seat and permanent-magnet direct current motor thereof

Info

Publication number: WO2020063536A1
Application number: PCT/CN2019/107308
Authority: WO
Inventors: 龚红宇; 谢小五; 胡国俊; 李镇良; 左明光
Original assignee: 广东肇庆爱龙威机电有限公司
Priority date: 2018-09-30
Filing date: 2019-09-23
Publication date: 2020-04-02
Also published as: CN110971028A

Abstract

A permanent-magnet direct current motor and a vehicle seat using said motor, the motor comprising an armature core (30) and being characterized in that said armature core (30) comprises: a shaft portion (31), the center of the shaft portion (31) being provided with a shaft hole (32) used for mounting a rotary shaft (39), and a plurality of tooth rods (33), wherein each tooth rod (33) extends outwards along the radial direction from the outer periphery of the shaft portion (31), and an end portion of each tooth rod (33) is provided with a tooth top (34) that extends perpendicular to the tooth rod; each tooth top (34) is symmetrically provided, on a radial outer end surface thereof, with two auxiliary grooves (35); each tooth rod (33) has a radially symmetrical surface (36); and radial cross-sections at places at which center points between the radially symmetrical surfaces (36) and the auxiliary grooves (35) are located form 3-10 degree angles. Due to the iron core structure of the preset motor, said motor has a smaller size, a lighter weight and is lower in cost. In particular, an iron core having the foregoing structure may effectively lessen the vibration and noise of a motor.

Description

Vehicle seat and permanent magnet DC motor

This application claims priority from Chinese Patent Application No. 201811155191.3, filed on September 30, 2018, and the contents of the above-mentioned Chinese patent application disclosure are incorporated herein by reference in its entirety as part of this application.

Technical field

The invention relates to the field of motor manufacturing, in particular to a permanent magnet DC motor for adjusting a seat.

Background technique

DC motor is mainly composed of stator, rotor and housing. Among them, the stator includes a machine base, a main magnetic pole, a commutating pole, an end cover, a bearing, and a brush device. The stator is stationary when the motor is running, and its main role is to generate a magnetic field. The rotor usually consists of a rotating shaft, an armature core, an armature winding, a commutator, and a fan. The rotor continuously rotates when the motor is running to generate electromagnetic torque or induced electromotive force. It is the hub of DC motors for energy conversion. It is called an armature. The casing is a protective casing of the motor, and the stator and the rotor are arranged in an inner cavity of the casing.

For the permanent magnet DC motor used to adjust the seat according to the present invention, the technician always hopes that the motor can obtain more advantages in low speed, large torque, stability, smaller installation volume, lighter weight, lower noise, etc. good performance.

Summary of the Invention

The purpose of the present invention is to improve the permanent magnet DC motor of the prior art, so that it can better meet the installation and power requirements of the vehicle seat adjustment system.

The present invention provides a permanent magnet DC motor, which includes an armature core, characterized in that the armature core includes: a shaft portion, a shaft hole for installing a rotating shaft is provided in the center of the shaft portion, and a plurality of racks Each tooth bar projects radially from the outer periphery of the shaft portion, and an end portion of each tooth bar is provided with a tooth top extending vertically, and a radial outer end surface of each tooth top is symmetrically Two auxiliary grooves are provided, wherein each rack bar has a radial symmetry plane, and the radial symmetry plane and the radial section where the center point of the auxiliary groove forms an included angle of 3-10 degrees.

The above-mentioned motor has a smaller size, lighter weight, and lower cost because of its iron core structure. In particular, the iron core with the above structure can effectively reduce the vibration and noise of the motor.

Preferably, the outer diameter of the armature core is 10-30 mm.

Preferably, the outer diameter of the armature core is 15-30 mm.

Preferably, 9 or 10 racks are included.

Preferably, the tooth width of the rack bar is 1.6-3 mm.

Preferably, a housing is further included, the housing includes a first section having a regular polygonal cross section, an outer surface of the first section includes an opposite first plane and a second plane, and the first section A magnetic cylinder is fixedly installed in the inner cavity of the magnetic cylinder, and the outer surface of the magnetic cylinder is closely attached to the inner surface of the casing.

Preferably, the magnetic cylinder is fixed in the casing of the motor to form a stator of the motor, the magnetic cylinder is formed into an integral part by an injection molding or pressing process, and the magnetic cylinder forms a plurality of magnetic poles connected in sequence by magnetization, Adjacent two magnetic poles have opposite magnetic properties, and the cross section of the magnetic cylinder includes a circular inner surface and a regular polygonal outer surface.

Preferably, each magnetic pole has a maximum radial thickness at an intermediate position and has a minimum radial thickness at a boundary with an adjacent magnetic pole, and each magnetic pole has a gap from an inner surface of the housing at the intermediate position Cooperate.

The present invention also provides a vehicle seat, which includes an adjustment mechanism, and the adjustment mechanism includes the permanent magnet DC motor described above.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, the specific content of the present invention will be described in more detail with reference to the drawings, in which:

FIG. 1 shows a schematic diagram of a DC motor according to the present invention;

Figure 2 is an exploded view of the DC motor shown in Figure 1;

3A is a cross-sectional view of the motor shown in FIG. 1 at a first section position;

3B is an axial cross-sectional view of the motor shown in FIG. 1 along a housing portion;

4 is a schematic perspective view of the magnetic cylinder in FIG. 3;

5 is a schematic perspective view of the armature core in FIG. 3;

6 is a schematic diagram of another specific motor according to the present invention;

7 is a schematic perspective view of a left end portion of the motor shown in FIG. 6;

FIG. 8 is a schematic perspective view of a right end portion of the motor shown in FIG. 6.

The contents shown in the above drawings are merely examples and illustrations, and are not drawn strictly to scale, nor are all parts or details related to the specific use environment completely drawn. After understanding the principles and concepts of the present invention, those skilled in the art will be able to think of related technical content known in the art that needs to be added to implement the present invention in a specific use environment.

detailed description

The terms "first", "second", and the like that may be used in the following description are not intended to limit any order, and their purpose is only to distinguish individual components, parts, structures, components, etc., and these independent components, parts, etc. , Structure, and element can be the same, similar, or different. At the same time, descriptions of orientations that may be used in the following description, such as "up", "down", "inside", "outside", "left", "right", "radial", "axial", etc. Unless there is an explicit description, it is only for convenience of description, and it is not intended to limit the technical solution of the invention.

FIGS. 1-3 show a specific DC motor according to the present invention as a whole, which includes a long cylindrical casing 10, and a magnetic cylinder 20 is fixedly installed in the casing 10. The housing 10 and its internal magnetic cylinder 20 together form a stator of the motor, and are fixedly mounted to, for example, a vehicle seat through the housing 20 as a part of the vehicle seat. The housing 10 of the motor is used not only as a mechanical support for the entire motor, but also as a yoke of a magnetic pole of a magnetic cylinder to guide and transmit a magnetic field.

A rotatable rotor is housed in the inner cavity of the magnetic cylinder 20. The rotor includes an armature core 30 and a winding disposed on the armature core 30. The armature core 30 is mounted on the rotating shaft 31, and both ends of the rotating shaft 31 are supported on the casing 10. An end cover 40 is also arranged on the casing 10, and many necessary components are integrated on the end cover 40, such as brushes and the like. In order to support the rotating shaft 31, a bearing is provided on the end cover 40, and the other end portion of the housing 10 is correspondingly formed with a convex portion for mounting the bearing. In the case where the motor is, for example, a motor, an electric current is connected to the windings on the armature core 30 through the end cover 40, and a magnetic field of the magnetic cylinder 20 generates a torque to drive the rotor to rotate.

Referring specifically to FIG. 2, the barrel of the motor housing 10 is divided into three parts in the axial direction: a first section 11 located in the middle, a second section 14 near the right end, and a third section 19 near the left end. Among them, the inner cavity of the first section 11 is used to receive the magnetic cylinder 20 and the armature core 30, the second section 14 is used to install the end cap 40, and the third section is mainly used for the positioning and installation of the magnetic cylinder 20. Ear 50, which will be explained in more detail below.

With reference to FIG. 3, it can be seen that the first section 11 has a regular hexagonal cross section, that is, the first section includes three sets of parallel and opposite shell planes, and each set of parallel planes includes opposite first and second planes 12 and 2 13. The magnetic cylinder 20 is fixedly installed in the inner cavity of the first section 11. For example, the magnetic cylinder 20 is fixedly installed in the inner cavity of the first section by an adhesive. The magnetic cylinder has a regular hexagonal cross-section appearance that fits the inner surface of the first section. The inner surface of the case can fit well with the corresponding regular polygonal appearance of the magnetic cylinder, and an adhesive is injected between the two gaps to securely mount the magnetic cylinder into the casing so that the two form a stator. . Such a mounting structure is more convenient and reliable than a conventional cylindrical shell.

The outer surface of the second section 14 of the housing is composed of opposing first and second

curved surfaces

17 and 18, opposing third and

fourth planes

15, and 16, the third and

fourth planes

15, 15 16 extends coplanar with the first plane 12 and the second plane 13, respectively. The opposing third and

fourth planes

15 and 16 can effectively reduce the installation space of the motor, because the third and fourth planes have a smaller size than the conventional cylindrical housing. At the same time, the first curved surface and the second curved surface can provide enough space for installing the end cover, and accommodate various electrical components and mechanical components integrated on the end cover. For this reason, the structure of the second section can effectively reduce the radial size of the motor without reducing the performance of the motor. This is especially effective for use cases where the installation space of a vehicle seat is extremely limited.

The third section 19 of the housing has a circular cross section, and its diameter is smaller than the distance between the first plane 12 and the second plane 13. Due to its smaller size, the third section forms a stepped configuration with the first section, which is formed as an axial stop in the housing 10 when the magnetic cylinder 20 is installed. The free end of the third section 19 is provided as the bottom of the housing 10, and a convex portion is provided in the middle of the bottom portion. A bearing is installed in the convex portion, and the rotating shaft 31 of the rotor is installed in the bearing so as to be rotatable Support.

To facilitate the installation of the motor, mounting ears 50 are provided at both ends of the motor, that is, the free end of the third section 11 of the motor housing and the outer end of the end cover 40 are fixedly mounted with the mounting ears 50. The mounting ear 50 includes a substantially cylindrical body 51, a mounting portion 52 extending radially outward from one end of the body 51, and a positioning portion 53 protruding radially outward in a length direction of the body 51. The mounting portion 21 is fixed to the housing 10 using bolts, so that the entire mounting ear 50 is fixed to the housing 10 or an end cover and becomes an integral part of the motor. The vehicle seat is provided with a circular mounting hole adapted to the mounting portion 52, and a wall portion of the mounting hole is provided with a positioning hole adapted to the positioning portion 53. During installation, the mounting portion 52 is inserted into the mounting hole of the vehicle seat, and the positioning portion 53 is inserted into the mounting hole, so that the entire motor is supported by the mounting portion 52, and the radial mounting position of the motor is guaranteed and maintained by the positioning portion 53, Does not rotate during work.

6-8 show another specific DC motor according to the present invention. The motor differs from the example in Figures 1-3 in the housing. Specifically, the housing of the motor is constructed with only the first section and the second section, and the third section is omitted. In other words, the motor housing omits a stepped stop for mounting the magnetic cylinder. As an alternative to the stepped stop portion, a convex portion or other stop structure may be provided on the inner cavity surface of the first portion of the housing. Owing to the omission of the third part, the machining of the housing is simpler and has a smaller axial dimension. Such a structure is particularly beneficial to a use environment where the axial installation space is limited.

Continuing to refer to FIG. 4, there is shown a magnetic cylinder 20 of the permanent magnet DC motor shown in FIG. 1. The magnetic cylinder 20 is used to be fixed in the motor housing 10 to form a stator of the motor. As shown in the figure, the magnetic cylinder 20 is an integral part, and is usually formed by injection molding or pressing. The material of the magnetic cylinder can be ferrite magnetic powder or anisotropic (or isotropic) bonded neodymium iron boron magnetic powder and epoxy resin press molding, or made of ferrite magnetic powder or anisotropic (or isotropic) NdFeB magnetic powder is injection molded with PA or PPS and other thermoplastic materials.

The outer periphery of the magnetic cylinder 20 is formed in a hexagonal shape, and is in contact with the inner surface of the casing 10, and the inner cavity thereof is cylindrical, and is used to receive the armature core 30. The magnetic cylinder 20 is sequentially connected to six magnetic poles through magnetization. In other words, the magnetic cylinder 20 is divided into six magnetic poles, and two adjacent magnetic poles have opposite magnetic properties. Specifically, each magnetic pole has the largest radial thickness at an intermediate position along the arc angle, and has the smallest radial thickness at the boundary with the adjacent magnetic pole. Each outer edge of the outer periphery of the cross section of the magnetic cylinder 20 is formed by connecting two adjacent magnetic poles in a straight plane.

The outer surface of each magnetic pole includes an arc surface 21 in the middle and a straight surface 22 on both sides, and the arc surface 21 and the straight surface 22 are connected with rounded corners 23. When the magnetic cylinder 20 is installed in the casing 10, there is an air gap between the curved surface 21 and the casing 10, and the straight surface 22 is kept in close contact with the casing 10. In addition, at least one end portion of the magnetic cylinder 20 is provided with a notch for circumferential installation and positioning of the magnetic cylinder.

The magnetic cylinder 20 with a hexagonal cross section has a smaller thickness at the interface with adjacent magnetic poles than the circular magnetic cylinder in the prior art, which not only reduces the size and material of the magnetic cylinder, but also effectively weakens the motor. Self vibration and noise.

Although the magnetic cylinder 20 shown in the figure has a hexagonal cross section and six magnetic poles, based on the same idea as above, the magnetic cylinder can also be formed into a quadrilateral (four magnetic poles) or an octagonal (eight magnetic poles).

Referring to FIG. 5, an armature core 30 of the motor of FIG. 1 is shown. The armature core 30 includes a shaft portion 31. A shaft hole 32 for mounting a rotating shaft 39 is provided in the center of the shaft portion 31. The outer periphery of the shaft portion 31 has a plurality of racks 33 extending in the radial direction. Each rack 33 A tooth tip 34 extending vertically and radially is provided at the end of the tooth tip. Two or four auxiliary grooves 35 are symmetrically provided on the outer end face of the tooth tip 34, wherein each toothed bar 33 has an axially symmetric surface 36, each The axial section 37 where the center point of the auxiliary groove 35 is located and the symmetry plane 36 form an included angle of 3-10 degrees.

Because the armature core of the present invention is provided with an auxiliary groove, it has lighter weight, smaller volume, and more significant cost under the same performance. In addition, the placement of the auxiliary slot also makes the electromagnetic noise and self-vibration of the motor smaller.

Preferably, the outer diameter of the armature core is 10-30 mm, and the outer diameter of the armature core is 15-30 mm, including 9 or 10 racks, and the tooth width of the rack is 1.6 -3 mm.

What has been described above are merely exemplary embodiments related to the spirit and principles of the present invention. Those skilled in the art can understand that, without departing from the spirit and principle, various changes can be made to the described examples. These changes and their equivalents are all conceived by the inventors, and Within the scope defined by the claims of the present invention.

Claims

A permanent magnet DC motor includes an armature core (30), characterized in that the armature core (30) includes:

A shaft portion (31), the shaft portion (31) of which is provided at its center with a shaft hole (32) for mounting a rotating shaft, and

A plurality of racks (33), each rack (33) projects radially from the outer periphery of the shaft portion (31), and an end of each rack (33) is provided with a vertical rack extension The tooth tips (34), two auxiliary grooves (35) are symmetrically arranged on the radially outer end surface of each tooth tip (34),

Wherein, each rack bar (33) has a radial symmetry plane (36), and the radial cross-section (37) of the radial symmetry plane (36) and the center point of the auxiliary groove (35) constitutes 3-10 degrees Angle.
The permanent magnet DC motor according to claim 1, characterized in that the outer diameter of the armature core (30) is 10-30 mm.
The permanent magnet DC motor according to claim 2, characterized in that the outer diameter of the armature core (30) is 15-30 mm.
The DC motor according to claim 1, characterized in that it comprises 9 or 10 racks (33).
The permanent magnet DC motor according to claim 1, characterized in that the tooth width of the tooth bar (33) is 1.6-3 mm.
The permanent magnet DC motor according to claim 1, further comprising a housing (10), the housing (10) comprising a first section (11) having a regular polygonal section, the first section (11) The outer surface includes a first plane (12) and a second plane (13) opposite to each other, and a magnetic cylinder (20) is fixedly installed in an inner cavity of the first section (11), and the magnetic cylinder ( The outer surface of 20) abuts the inner surface of the casing (10).
The permanent magnet DC motor according to claim 6, wherein:

The magnetic cylinder (20) is fixed in the casing (10) of the motor to constitute a stator of the motor,

The magnetic cylinder (20) is formed into a single piece through an injection molding or pressing process.

The magnetic cylinder (20) forms a plurality of magnetic poles connected in sequence by magnetization,

Adjacent magnetic poles have opposite magnetic properties, and

The cross section of the magnetic cylinder (20) includes a circular inner surface and a regular polygonal outer surface.
The permanent magnet DC motor according to claim 7, characterized in that:

Each magnetic pole has a maximum radial thickness at an intermediate position and a minimum radial thickness at a boundary with an adjacent magnetic pole, and each magnetic pole is gap-fitted with the inner surface of the housing at the intermediate position.
A vehicle seat includes an adjustment mechanism, wherein the adjustment mechanism comprises a permanent magnet DC motor according to any one of claims 1-8.