WO2000045500A1

WO2000045500A1 - Motor

Info

Publication number: WO2000045500A1
Application number: PCT/JP1999/000310
Authority: WO
Inventors: Nobuyoshi Tomiya
Original assignee: Seres Co., Ltd.
Priority date: 1997-09-29
Filing date: 1999-01-26
Publication date: 2000-08-03
Also published as: JPH11103552A

Abstract

A motor which is reduced in external size and ensures satisfactory sizes for a rotor and a winding part, wherein heteropolar permanent magnets (4a, 4b) are installed alternately at the corners of a square, hexagonal, or octagonal box-shaped motor case (1), the rotor (3) is disposed on the inner sides of these permanent magnets (4a, 4b), the rotating shaft (3a) of the rotor (3) is supported pivotally on the motor case (1) and, in addition, the surfaces of the permanent magnets (4a, 4b) opposed to the rotor (3) are formed in an arc-shape so as to uniform a clearance between the surfaces and the rotor (3).

Description

Specification

Square motor technology

The present invention relates to a small DC motor having a field formed by permanent magnets. Background art

Conventionally, the permanent magnet 4 is formed in a cylindrical shape (Fig. 6) or a gutter shape (Fig. 7), and its outer periphery is covered with a cylindrical case 1. The mouth 3 is opposed to the permanent magnet 4. It is placed between the N pole 4a and the S pole 4b magnetized at the position, and the case 1 is supported by inserting the rotating shaft 3b of the mouth 3 into the case 1.

The permanent magnets 4a and 4b form a magnetic field, and when a DC current is applied to the nipple winding wire 9 of the nipple 3, the nipple 3 rotates, and a DC current flows through a brush (not shown). Fig. 8 shows another conventional example in which the direction of the current is switched alternately and the rotation of the mouth 3 is continued.In this example, the permanent magnets 4a and 4b have a thick flat plate with one side in an arc-shaped cross section. As shown in Fig. 9, they have a round shape, and they are installed facing each other inside Case 1 that is bent in a U-shape, and Robe 3 is attached between them. In this case, the side of Case 1 was opened and the mouth 3 was exposed, so that dust entered and caused a failure.

6 and 7 have the disadvantage that the permanent magnet needs to be formed thick to obtain a strong magnetic force, and the overall shape becomes large. The thin walled part of the arc is easily damaged, and this part must be thickened to prevent damage As a result, there was a drawback that the entire model became large and heavy.

In recent years, there has been a great demand for small-sized mobile phones as vibrating mobile phones for mobile phones.However, as shown in Figs. 6, 7 and 8, there is a limit to downsizing permanent magnets as described above. There is no option but to reduce the size of the mouth and evening, but if the size of the low evening is reduced, the output of the night will be reduced, and there is a need for improvement. In order to maintain the characteristics and efficiency of the motor, it is necessary to secure the maximum energy product (BXH) of the permanent magnet, the size of the rotor 3 and the number of turns of the wrapper 9 There was a limit to miniaturization here.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-output small-sized motor with a small overall size without sacrificing the size of the low-speed. Disclosure of the invention

The configuration of the present invention is as follows.

The motor case is formed in an n-sided box shape (where n is 4, 6, or 8), and permanent magnets of different polarity are attached to the adjacent corners, and the mouth is placed between these permanent magnets. And the rotating shaft of the mouth is supported by the motor case.

Here, the surface of the permanent magnet facing the opening of the permanent magnet may be formed so as to be curved in the same concentric shape as that of the roving. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front sectional view of a motor embodying the present invention. FIG. 2 is a cross-sectional view taken along line AA of FIG. Fig. 3 shows the It is sectional drawing which shows 2nd Example of light. FIG. 4 is a sectional view showing a third embodiment of the present invention. FIG. 5 is a sectional view showing a fourth embodiment of the present invention. Fig. 6 to Fig. 9 are cross-sectional views of a conventional motor

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a motor embodying the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

1 is a rectangular box-shaped motor case, which is formed by narrowing a thin steel plate into a cylindrical shape with a closed end. 1a is a bearing part with a bearing press-fit hole 5 at the center.

Reference numeral 2 denotes a cover, which is formed with a stepped portion 2a according to the inner size of the mouth of the case 1. A bearing flange fitting seat 2c and a bearing press-fitting hole 5 are formed coaxially at the center of the bearing press-fitting portion 2b of the cover 2, and a bearing press-fitting is formed inside the cover 2. A pair of brushes 7 is fixed symmetrically with respect to the hole 5, and one end of the brush 7 protrudes outward from the cover 2.

Numeral 3 denotes a mouth, which is formed by press-fitting the rotating shaft 3b into the center of the mouth core 3a and press-fitting a commutator 8 into one side of the rotating shaft 3b.

The low iron core 3a is formed by stacking multiple sheet iron plates. The sheet iron plate is formed by projecting a plurality of pole pieces from the center in an equiangular radial pattern, expanding the ends of the pole pieces in an arc shape, and punching them out on the same circumference.

The commutator 8 has a cylindrical shape and is made of an insulating material, and a plurality of conductive segments divided along a central axis are provided on an outer periphery thereof. In the embodiment shown in Fig. 1, the iron core 3a has three poles, the segments of the commutator 8 are six segments, and the pole pieces of the iron core 3a are different from each other. A winding 9 is wound and its terminals are each connected to a predetermined segment of the commutator 8.

Next, as shown in Fig. 1 or Fig. 3, a space was formed in the corner space between case 1 and mouth 3 in case 1 to match the shape of the space. The N-pole permanent magnet 4a and the S-pole permanent magnet 4b are fixed with an adhesive or the like.

In FIG. 1, the surfaces of the permanent magnets 4a and 4b facing the mouth 3 are formed to have the same concentric curved shape to make the gap with the mouth 3 uniform.

The bearing 10 is press-fitted into the motor case 1, and the other side of the rotating shaft 3 b of the rotating shaft 3 b on which the rotating wire 9 is wound via the bearing 10 is inserted into the rotating shaft 3. The commutator 8 side of b is supported by the bearing 10 of the cover 2, the stepped portion 2 a of the cover 2 is fitted and fixed in the motor case 1, and the opening 3 is freely rotatable with respect to the motor case 1. To support. At this time, a pair of brushes 7 of the cover 2 are opposed to each other across the segment of the commutator 8.

With the configuration as described above, the ends of a pair of brushes 7 protruding outward are connected to a DC power supply, and the coil is connected to the brushes via the segments of the commutator 8 in contact with the brushes. An electric current is passed through 9 to generate an electromagnet on the pole piece, and the mouth 3 is rotated by the magnetic field of the permanent magnets 4a and 4b.

The rotation of the rotor 3 causes the pair of brushes 7 to move on the segments of the commutator 8 to sequentially switch the winding wire 9 and change the direction of the current. Changing, changing the polarity of each pole piece's electromagnet, and maintaining the rotation of Ryukyu 3. As described above, since the permanent magnets 4a and 4b are formed according to the shape of the space at the corner of the motor case 1, the thickness of the permanent magnet can be increased, and the maximum energy product can be maintained. Wear.

In this embodiment, the low-iron core 3a has three poles, but the same effect can be obtained even if the low-iron core 3a has three poles or more.

By mounting the permanent magnets 4a and 4b at the corners of the motor case 1, the external shape of the motor case 1 can be made smaller than the diameter of the motor case 3. Therefore, even with a roller 3 having the same outer diameter as the conventional one, a motor with a small external dimension can be provided.

In addition, since the outer shape of the motor case 1 is made into a rectangular box shape to cover the entire circumference of the motor, dust does not enter the case, and since it is rectangular, the conventional cylindrical motor is used. As described above, the motor case 1 can be fixed directly to the device to which the motor is to be mounted by screwing or bonding without providing a special mounting foot on the motor case 1. In addition, if it is square, it can be easily and reliably handled even when handling the motor as an assembly part at a factory or the like, even if it is handled by a robot such as an automated assembly line robot. be able to.

In the above embodiment, a plurality of permanent magnets 4a and 4b were prepared and attached at each corner, but as shown in FIG. 5, individual permanent magnets to be deployed at the corners were used. It may be connected and integrated.

The permanent magnet shown in Fig. 5 has a central portion of a prism that is formed in a circular shape, and N and S are magnetized at a pair of corners 4a and 4b that face each other diagonally. Because it is integrated, it is hard to break even if the thin part sandwiched between the corners is formed thin. Therefore, there is an advantage that not only the size of the motor can be reduced while maintaining the strength, but also the number of parts to be assembled is reduced and the handling is convenient. Also in this example, the permanent magnet is housed in the case 1 having a rectangular cylindrical shape. The case is not limited to a square, but may be a hexagon or octagon.o Industrial applicability

In the present invention, the case is made into an n-sided box (where n is any of 4, 6, or 8), and a permanent magnet having a different polarity is provided at an adjacent corner between the mouth and the case. By arranging them, it is possible to make the outer shape of the motor smaller without sacrificing the outer diameter of the opening 3.

The surface facing the mouth of the permanent magnet is curved in the same concentric shape to form a uniform gap with the mouth and uniform magnetic flux density. Can smooth rotation and enhance its electrical characteristics o

In addition, by making the outer shape of the case into a rectangular, hexagonal or octagonal box shape, it is possible to easily install and handle the case.

Claims

The scope of the claims

1. The motor case is formed in an n-sided box shape (n is 4, 6, or 8), and permanent magnets of different polarity are attached to adjacent corners of the motor case. A motor in which a rotating shaft is arranged between the motor case and the rotating shaft of the mouth is supported by the motor case.

2. The motor according to claim 1, wherein the surface of the permanent magnet facing the mouth is curved so as to have the same concentric shape as the mouth.