CN110971028A

CN110971028A - Vehicle seat and permanent magnet direct current motor thereof

Info

Publication number: CN110971028A
Application number: CN201811155191.3A
Authority: CN
Inventors: 龚红宇; 谢小五; 胡国俊; 李镇良; 左明光
Original assignee: Guangdong Zhaoqing L&V Co Ltd
Current assignee: Guangdong Zhaoqing L&V Co Ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2020-04-07
Also published as: WO2020063536A1

Abstract

The invention provides a permanent magnet direct current motor, which comprises an armature core, and is characterized in that the armature core comprises: the central authorities of this axial region are provided with the shaft hole that is used for installing the pivot, and a plurality of ratchets, and every ratchets all follows the periphery of axial region is along radially stretching out to the tip of every ratchets all is provided with the addendum that perpendicular ratchets extend, is provided with two auxiliary grooves on the radial outer terminal surface of every addendum symmetrically, and wherein, every ratchets all has radial symmetry plane, radial symmetry plane and the radial cross-section at auxiliary groove's central point place constitute 3-10 degrees contained angles. The motor has smaller size, lighter weight and lower cost due to the iron core structure. Particularly, the iron core with the structure can effectively reduce the vibration and the noise of the motor. The invention also provides a vehicle seat using the motor.

Description

Vehicle seat and permanent magnet direct current motor thereof

Technical Field

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

Background

The direct current motor mainly comprises a stator, a rotor and a shell. The stator includes frame, main magnetic pole, commutating pole, end cover, bearing, electric brush unit, etc. The stator is stationary when the motor is running and mainly functions to generate a magnetic field. The rotor is generally composed of a rotating shaft, an armature core, an armature winding, a commutator, a fan, and the like. The rotor continuously rotates when the motor operates to generate electromagnetic torque or induced electromotive force, and is a hub for energy conversion of the dc motor, which is called an armature. The shell is a protective shell of the motor, and the stator and the rotor are arranged in an inner cavity of the shell.

For the permanent magnet dc motor for adjusting a seat according to the present invention, it is always desirable for the skilled person to be able to obtain better performance of the motor in terms of low rotation speed, large torque, stability, smaller installation volume, lighter weight, lower noise, etc.

Disclosure of Invention

The object of the present invention is to improve the permanent magnet direct current motors of the prior art so that they can better meet the installation and power requirements of the adjustment system of the vehicle seat.

The invention provides a permanent magnet direct current motor, which comprises an armature core, and is characterized in that the armature core comprises: the central authorities of this axial region are provided with the shaft hole that is used for installing the pivot, and a plurality of ratchets, and every ratchets all follows the periphery of axial region is along radially stretching out to the tip of every ratchets all is provided with the addendum that perpendicular ratchets extend, is provided with two auxiliary grooves on the radial outer terminal surface of every addendum symmetrically, and wherein, every ratchets all has radial symmetry plane, radial symmetry plane and the radial cross-section at auxiliary groove's central point place constitute 3-10 degrees contained angles.

The motor has smaller size, lighter weight and lower cost due to the iron core structure. Particularly, the iron core with the structure can effectively reduce the vibration and the noise of the motor.

Preferably, the armature core has an outer diameter of 10 to 30 mm.

Preferably, the armature core has an outer diameter of 15 to 30 mm.

Preferably, 9 or 10 toothed bars are included.

Preferably, the tooth width of the toothed bar is 1.6 to 3 mm.

Preferably, the magnetic cylinder further comprises a housing, the housing comprises a first section with a regular polygonal cross section, the outer surface of the first section comprises a first plane and a second plane which are opposite, and a magnetic cylinder is fixedly mounted in the inner cavity of the first section, and the outer surface of the magnetic cylinder is attached to the inner surface of the housing.

Preferably, the magnetic cylinder is fixed to a housing of the motor to constitute a stator of the motor, the magnetic cylinder is formed as a single piece through an injection molding or pressing process, the magnetic cylinder is magnetized to form a plurality of magnetic poles connected in sequence, two adjacent magnetic poles have opposite magnetism, and a cross section of the magnetic cylinder includes a circular inner surface and a regular polygonal outer surface.

Preferably each pole has a maximum radial thickness at an intermediate location and a minimum radial thickness at the interface with an adjacent pole, and each pole is clearance fitted to the inner surface of the housing at the intermediate location.

The invention also provides a vehicle seat which comprises an adjusting mechanism, wherein the adjusting mechanism comprises the permanent magnet direct current motor.

Drawings

The invention will be described in more detail below with reference to the accompanying drawings, in which:

fig. 1 shows a schematic view of a direct current motor according to the invention;

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

FIG. 3A is a transverse cross-sectional view of the motor of FIG. 1 in a first segment position;

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

FIG. 4 is a perspective diagrammatic illustration of the magnetic cylinder of FIG. 3;

fig. 5 is a perspective view of the armature core of fig. 3;

FIG. 6 is a schematic view of another embodiment of a motor according to the present invention;

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

fig. 8 is a perspective view of the right end of the motor shown in fig. 6.

The drawings described above are for illustration and example only and are not necessarily to scale, nor are they intended to depict all of the components or details relevant to the particular environment of use. Those skilled in the art will appreciate that the conception and specific use of the disclosure may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention.

Detailed Description

The terms "first," "second," and the like, as may be used in the following description, are not intended to limit any order, but merely distinguish between various separate components, features, structures, elements, and the like, which may be the same, similar, or different. Meanwhile, descriptions about orientations, such as "upper", "lower", "inner", "outer", "left", "right", "radial", "axial", and the like, which may be used in the following description, are only for convenience of description unless explicitly stated, and are not intended to form any limitation on the technical solution of the present invention.

Fig. 1 to 3 show a specific dc motor according to the present invention as a whole, which includes a housing 10 having a long cylindrical shape, and a magnetic cylinder 20 fixedly installed in the housing 10. The housing 10 constitutes a stator of the motor together with the magnetic cylinder 20 inside thereof, and is fixedly mounted to, for example, a vehicle seat through the housing 20 as a part of the vehicle seat. The housing 10 of the machine not only serves as a mechanical support for the entire machine, but also as a yoke for the magnetic poles of the magnetic cylinder, guiding and transmitting the magnetic field.

A rotor is rotatably received in the bore 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 a rotating shaft 31, and both ends of the rotating shaft 31 are supported on the housing 10. An end cap 40 is also disposed on the housing 10, and a number of necessary components, such as brushes and the like, are integrated into the end cap 40. To support the rotating shaft 31, a bearing is provided on the end cap 40, and the other end of the housing 10 is correspondingly formed with a boss for mounting the bearing. In the case of an electric machine such as an electric motor, current is passed through the end cap 40 to the windings on the armature core 30, and under the action of the magnetic field of the magnetic cylinder 20, torque is generated to drive the rotor to rotate.

Referring specifically to fig. 2, the cylindrical body of the motor housing 10 is divided into three parts in the axial direction: a first section 11 in the middle, a second section 14 near the right end, and a third section 19 near the left end. The first section 11 has an inner cavity for accommodating the magnetic cylinder 20 and the armature core 30, the second section 14 is used for mounting the end cap 40, and the third section is mainly used for mounting and positioning the magnetic cylinder 20 and mounting the lug 50, which will be described in more detail below.

As can be seen in connection with fig. 3, the first section 11 has a cross-section in the form of a regular hexagon, i.e. the first section comprises three sets of parallel opposing shell planes, each set of parallel planes comprising opposing first and

second planes

12, 13. The magnetic cylinder 20 is fixedly mounted in the inner cavity of the first section 11, for example, the magnetic cylinder 20 is fixedly mounted in the inner cavity of the first section by an adhesive. The magnetic cylinder has a regular hexagonal cross-sectional exterior surface that conforms to the inner surface of the first section. The inner surface of the housing can be well matched with the corresponding regular polygon appearance of the magnetic cylinder, and adhesive is injected between the two gaps to reliably fix the magnetic cylinder in the housing, so that the two form a stator. Compared with the traditional cylindrical shell, the mounting structure is more convenient and reliable.

The outer surface of the second section 14 of the housing is made up of first and second opposite cambered

surfaces

17, 18, and third and fourth opposite

flat surfaces

15, 16, the third and fourth

flat surfaces

15, 16 extending coplanar with the first and second

flat surfaces

12, 13, respectively. The opposing third and

fourth planes

15 and 16 can effectively reduce the installation space of the motor because of the smaller dimension between the third and fourth planes compared to the conventional cylindrical housing. At the same time, the first and second arcs may provide sufficient space for mounting the end cap to accommodate various electrical and mechanical components integrated on the end cap. Therefore, the structure of the second section can effectively reduce the radial size of the motor under the condition of not reducing the performance of the motor. This is particularly effective in a use case where the installation space of a vehicle seat or the like is extremely limited.

The third section 19 of the housing has a circular cross-section and a diameter 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 for the magnetic cartridge 20 in the housing 10 when it is installed. The free end of the third section 19 is arranged as the bottom of the housing 10, and the bottom is provided at a middle position with a protrusion in which a bearing is mounted, and the rotating shaft 31 of the rotor is mounted in the bearing so as to be rotatably supported.

For the motor easy to install, the both ends of motor all are provided with installation ear 50, also are the outer end of the free end of third section 11 of motor casing and end cover 40 all fixed mounting have installation ear 50 promptly. The mounting ear 50 includes a generally cylindrical body 51, a mounting portion 52 extending radially outward from one end of the body 51, and a positioning portion 53 projecting radially outward in the length direction of the body 51. The mounting portion 21 is fixed to the housing 10 using bolts so that the entire mounting lug 50 is fixed to the housing 10 or the end cover and becomes an integral part of the motor. A circular mounting hole that fits the mounting portion 52 is provided on the vehicle seat, and a wall portion of the mounting hole is provided with a positioning hole that fits the positioning portion 53. When mounting, 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 motor as a whole is supported by the mounting portion 52, and the radial mounting position of the motor is secured and maintained by the positioning portion 53, and does not rotate during operation.

Fig. 6-8 illustrate another specific dc motor according to the present invention. The motor differs from the example of fig. 1-3 by the housing. In particular, the housing of the electric machine is constructed with only a first section and a second section, while the third section is omitted. In other words, the motor housing omits a stepped stop portion for mounting the magnetic cylinder. Instead of the stepped stop portion, a protrusion or other stop structure may be provided on the inner cavity surface of the first part of the housing, respectively. The housing is simpler to machine and has a smaller axial dimension due to the omission of the third portion. Such a structure is particularly advantageous for use environments where axial installation space is limited.

With continued reference to fig. 4, there is shown the magnetic cylinder 20 of the permanent magnet dc motor of fig. 1, said magnetic cylinder 20 being intended to be fixed inside the motor housing 10 to constitute the stator of the motor. As shown, the magnetic cylinder 20 is a unitary piece, typically formed by an injection molding or pressing process. The magnetic cylinder can be made of ferrite magnetic powder or anisotropic (or isotropic) bonded neodymium iron boron magnetic powder and epoxy resin glue through compression molding, or made of ferrite magnetic powder or anisotropic (or isotropic) neodymium iron boron magnetic powder and PA or PPS and other thermoplastic glue through injection molding.

The magnetic cylinder 20 has a hexagonal outer circumference contacting the inner surface of the housing 10, and has a cylindrical inner cavity for receiving the armature core 30. The magnetic cylinder 20 is magnetized to form six magnetic poles connected in series, or the magnetic cylinder 20 is equally divided into six magnetic poles, and two adjacent magnetic poles have opposite magnetism. Specifically, each pole has a maximum radial thickness at an intermediate location along the arc angle and a minimum radial thickness at the boundary with the adjacent pole. Each outer edge of the outer periphery of the cross section of the magnetic cylinder 20 is formed by connecting straight surfaces of two adjacent magnetic poles.

The outer surface of each pole comprises an arc surface 21 in the middle and straight surfaces 22 on both sides, and the arc surface 21 and the straight surfaces 22 are connected by a fillet 23. When the magnetic cylinder 20 is installed in the housing 10, an air gap exists between the arc surface 21 and the housing 10, and the straight surface 22 is tightly attached to the housing 10. In addition, at least one end of the magnetic cylinder 20 is provided with a notch for circumferential installation and positioning of the magnetic cylinder.

Compared with the circular magnetic cylinder in the prior art, the magnetic cylinder 20 with the hexagonal cross section has smaller thickness at the junction with the adjacent magnetic pole, so that the size and the material of the magnetic cylinder are reduced, and the vibration and the noise of the motor can be effectively weakened.

Although the magnetic cylinder 20 shown in the drawings has a hexagonal cross section and six magnetic poles, the magnetic cylinder may be shaped into a quadrangle (four magnetic poles) or an octagon (eight magnetic poles) based on the same idea as described above.

Referring to fig. 5, there is shown the armature core 30 of the motor of fig. 1. The armature core 30 comprises a shaft part 31, a shaft hole 32 for installing a rotating shaft 39 is arranged in the center of the shaft part 31, a plurality of tooth bars 33 extending along the radial direction are arranged on the periphery of the shaft part 31, an end part of each tooth bar 33 is provided with a tooth top 34 extending along the vertical radial direction, two or four auxiliary grooves 35 are symmetrically arranged on the outer end surface of the tooth top 34, wherein each tooth bar 33 is provided with an axial symmetrical surface 36, and an axial section 37 of the central point of each auxiliary groove 35 forms an included angle of 3-10 degrees with the symmetrical surface 36.

The armature core provided by the invention has the advantages of lighter weight, smaller volume and more obvious cost under the same performance due to the arrangement of the auxiliary groove. Moreover, the arrangement of the auxiliary groove also enables the electromagnetic noise and the self-vibration of the motor to become smaller.

Preferably, the outer diameter of the armature core is 10-30 mm, the outer diameter of the armature core is 15-30 mm, the armature core comprises 9 or 10 toothed bars, and the width of the teeth of the toothed bars is 1.6-3 mm.

The foregoing description is only exemplary of the principles and spirit of the invention. It will be appreciated by those skilled in the art that changes may be made in the described examples without departing from the principles and spirit thereof, and that such changes are contemplated by the inventors and are within the scope of the invention as defined in the appended claims.

Claims

1. A permanent magnet direct current motor comprising an armature core (30), characterized in that the armature core (30) comprises:

a shaft part (31), a shaft hole (32) for mounting the rotating shaft is arranged at the center of the shaft part (31), an

A plurality of rack bars (33), each rack bar (33) protruding radially from the outer periphery of the shaft portion (31), and the end of each rack bar (33) being provided with a tooth crest (34) extending perpendicularly thereto, two auxiliary grooves (35) being symmetrically provided on the radially outer end face of each tooth crest (34),

each rack bar (33) is provided with a radial symmetrical surface (36), and the radial symmetrical surface (36) and a radial section (37) where the central point of the auxiliary groove (35) is located form an included angle of 3-10 degrees.

2. A permanent magnet direct current motor according to claim 1, characterized in that the outer diameter of the armature core (30) is 10-30 mm.

3. A permanent magnet direct current motor according to claim 2, characterized in that the outer diameter of the armature core (30) is 15-30 mm.

4. A direct current motor according to claim 1, characterized by comprising 9 or 10 toothed bars (33).

5. A permanent magnet direct current motor according to claim 1, characterized in that the width of the teeth of the toothed bar (33) is 1.6-3 mm.

6. The permanent magnet direct current motor according to claim 1, characterized by further comprising a housing (10), wherein the housing (10) comprises a first section (11) having a regular polygonal cross section, an outer surface of the first section (11) comprises a first plane (12) and a second plane (13) which are opposite, and a magnet cylinder (20) is fixedly mounted in an inner cavity of the first section (11), and an outer surface of the magnet cylinder (20) abuts against an inner surface of the housing (10).

7. The permanent magnet direct current motor according to claim 6,

the magnetic cylinder (20) is fixed in a shell (10) of the motor to form a stator of the motor,

the magnetic cylinder (20) is formed into a whole piece through injection molding or pressing,

the magnetic cylinder (20) forms a plurality of magnetic poles which are connected in sequence by magnetizing,

the two adjacent magnetic poles have opposite magnetic properties, an

The cross section of the magnetic cylinder (20) comprises a circular inner surface and a regular polygonal outer surface.

8. The permanent magnet direct current motor according to claim 7,

each pole has a maximum radial thickness at an intermediate location and a minimum radial thickness at the interface with an adjacent pole, and each pole is clearance fit with the inner surface of the housing at the intermediate location.

9. Vehicle seat comprising an adjustment mechanism, characterized in that the adjustment mechanism comprises a permanent magnet direct current motor according to one of claims 1-8.