JP2005253164A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which realizes higher torque, thinning, and downsizing. <P>SOLUTION: This brushless motor has a field assembly where a flexible rare earth anisotropic magnet 1 subjected to multipolar magnetization is mounted on a ring-shaped steel plate 2 constituted of a magnetic substance and the end face 1a of the flexible rare earth anisotropic magnet 1 is mounted in roughly close contact on the frame 3 of a nonmagnetic substance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor having a field assembly in which a flexible rare earth anisotropic magnet subjected to multipolar magnetization is attached to a ring-shaped steel plate made of a magnetic material and attached to a nonmagnetic material frame in a substantially close contact state.

Conventionally, in order to reduce the motor thickness, increase torque, and reduce costs, a rubber magnet has been used for the rotor magnet, the number of salient pole parts of the stator core is set to 9, and the number of magnetic poles in the circumferential direction of the magnet is set to 6. A flat brushless motor with an increased number of magnetic fluxes has been known (for example, see Patent Document 1).
JP-A-3-70459

  Conventionally, when the motor frame is made of a magnetic material such as an iron plate, magnetic leakage occurs if the gap between the end surface of the magnet and the frame is narrow, and magnetic flux leakage occurs even if the rubber magnet is anisotropic. This hindered high torque, thinning and downsizing.

  The present invention solves the above-described problems, and an object thereof is to provide a motor that achieves high torque, thinning, and miniaturization.

  A sheet-like flexible rare earth anisotropic magnet is subjected to multipolar magnetization and curved in a cylindrical shape, and is attached to a ring-shaped steel plate made of a magnetic material to constitute a field assembly. The field assembly is attached to a non-magnetic frame in a substantially close contact state.

  Or the said ring-shaped steel plate is integrated with the said flame | frame with resin etc., and the said magnet poled by multipolar is mounted | worn with the substantially peripheral state on the internal peripheral surface.

  Alternatively, the magnet is attached to a sheet-like magnetic body to perform multipolar magnetization to form an attachment body, and the attachment body is bent into a cylindrical shape and attached to a non-magnetic frame in a substantially intimate contact state.

Since the frame is made of a non-magnetic material, magnetic leakage does not occur even when the end face of a magnet with multiple poles is brought into close contact with the frame, so that a small and thin motor with high torque can be realized.

  In addition, the loss of magnetic flux can be reduced and a small motor with high output can be realized by a process of attaching a sheet-like flexible rare earth anisotropic magnet to a sheet-like magnetic body and performing multipolar magnetization.

A flexible rare earth anisotropic magnet with multipolar magnetization was attached to a ring-shaped steel plate made of a magnetic material, and the end face of the flexible rare earth anisotropic magnet was attached to a non-magnetic frame in a substantially intimate contact state. A motor having a field assembly.

  Details of the present invention will be described with reference to the following examples.

  FIG. 1 is a half sectional view of a main part of a brushless motor. In FIG. 1, a frame 3 made of a non-magnetic material is fixed to a shaft 4 and is rotatably supported by a bearing 5 provided on a stator 6. A sheet-like flexible rare earth anisotropic magnet 1 (hereinafter referred to as magnet 1) and a ring-shaped steel plate 2 are mounted on the inner peripheral surface of the frame 3.

  First, multipolar magnetization is performed so that N poles and S poles are alternately arranged in the winding direction of the magnet 1. At this time, multipolar magnetization is performed so that the end portion 9 of the magnet 1 in the winding direction and the boundary position 10 of the magnetic pole coincide with each other.

Next, the magnet 1 is bent into a cylindrical shape,
Attached to the ring-shaped steel plate 2. At this time, the magnet end face 1a is attached to the frame 3 made of a nonmagnetic material so as to be in a substantially close contact state.

  At this time, the frame 3 and the ring-shaped steel plate 2 or the ring-shaped steel plate 2 and the magnet 1 may be fixed with an adhesive or the like.

  According to this embodiment, the frame 3 is made of a non-magnetic material, so that magnetic leakage can be prevented even when the magnet end surface 1a is in close contact with the frame 3, and a small, thin and high torque motor can be realized.

  FIG. 4 is a half sectional view of a main part of a motor having a field assembly in which the frame 3 and the ring-shaped steel plate 2a are integrated with a resin in advance and the upper end surface 1a in the thickness direction of the magnet 1 is substantially in close contact with the frame 3. is there.

  First, the ring-shaped steel plate 2a is integrated with the frame 3 with resin or the like to constitute a rotor assembly. At this time, the ring-shaped steel plate 2a and the shaft 4 may be integrally formed with resin or the like, and the frame 3 may be formed at the same time.

  Next, the magnet 1 magnetized by the method of the first embodiment is bent into a cylindrical shape, and the magnet end face 1a is attached to the frame 3 so as to be along the inner side of the ring-shaped steel plate 2.

  Since the frame 3 is made of a non-magnetic material, even if the magnet end face 1a is attached to the frame in a substantially close contact state, magnetic leakage from the frame 3 does not occur, and the motor can be reduced in thickness and torque can be prevented from being reduced. realizable.

  The field assembly used in the first embodiment can be manufactured in the following configuration.

  FIG. 5 shows an attachment 11 in which a sheet steel plate 2 is attached to a magnet 1 and subjected to multipolar magnetization.

In the first step, a sheet steel plate 2 made of a magnetic material is attached to the magnet 1, and multipolar magnetization is performed in the same manner as in Example 1 to obtain an attachment body 11. The attachment 11 is multipolarized so that the N pole and the S pole are alternately arranged in the winding direction. At this time, the winding direction end portion 12 of the curved attachment body 11 and the boundary position 10 of the multipolar magnetized magnetic pole are made to coincide with each other.
In the second step, the attachment body 11 is bent into a cylindrical shape to form a field assembly, and attached to the frame 3 made of a non-magnetic material so that the magnet end surface 1a is in a substantially intimate contact state.

  By performing magnetization in a state of being attached to the sheet steel plate 2, demagnetization is reduced as compared with magnetization using only a magnet, and a high-power small motor can be realized.

  The present invention can also be implemented in a motor with a brush whose field assembly is fixed.

  According to the present invention, a small, thin and high torque motor can be realized, which is useful for mobile devices and the like.

The principal part half sectional view of the brushless motor in Example 1 of the present invention. The figure which shows the state of the multipolar magnetization of the magnet in Example 1 of this invention Cross section of anisotropic magnet formed in a cylindrical shape in Example 1 of the present invention The principal part half sectional view of the brushless motor in Example 2 of the present invention The figure which shows the structure of the attachment body in Example 3 of this invention, and the state of multipolar magnetization Sectional drawing of the attachment in Example 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible rare earth anisotropic magnet 1a Upper end surface of magnet thickness direction 2, 2a Steel plate 3 Frame 4 Shaft 5 Bearing 6 Stator 7 Drive circuit board 8 Feed part 9 End part of magnet winding direction 10 Magnetic pole boundary position 11 Attachment Body 12 End of attachment body winding direction

Claims (2)

A flexible rare earth anisotropic magnet with multipolar magnetization was attached to a ring-shaped steel plate made of a magnetic material, and the end face of the flexible rare earth anisotropic magnet was attached to a non-magnetic frame in a substantially intimate contact state. A motor having a field assembly. A first step of attaching a sheet-like flexible rare earth anisotropic magnet to a sheet-like magnetic body and performing multipolar magnetization to make the attachment body, and bending the attachment body into a cylindrical shape and making it non-magnetic Manufacturing method of a field assembly provided with the 2nd process of mounting to a frame of this in the state of adhesion almost.

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