JPH04108377U - coreless motor - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] By creating a structure in which the shaft of a cylindrical coreless motor does not pass through the field magnet, the diameter of the magnet can be reduced and the motor can be made more compact. [Structure] The rotor 15 includes a bearing 10 formed at the tip of a cylindrical field magnet 16 fixed at one end of a cylindrical housing case, and a brush house 11 disposed at the other end of the housing case 7. The shaft 14 is supported by a bearing 12 attached to the magnet 16, and the shaft 14 is taken out from the housing case on the opposite side to the magnet 16 and used as an output shaft.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a bearing structure in the rotor of a small coreless motor. .

0002

[Conventional technology]

In conventional cylindrical coreless motors, hollow cylindrical field magnets are used. there was. Figure 2 shows the structure of a conventional coreless motor, with cylindrical coil 1, cylindrical coil A support 2, a commutator 3 formed on this support, and a support passing through the center of the support. In a rotor 5 consisting of a shaft 4 fixed to a holder, this rotor 5 has a The foot 4 passes through the hollow cylindrical field magnet 6 and is attached to one end side of the cylindrical housing case 7. It is supported by a bearing 8 placed at the end of the housing case 7 and a bearing 9 placed at the other end of the housing case 7. This is an approved structure.

0003

[Problem that the idea aims to solve]

With this type of structure, the shaft is placed inside the magnet as motors are required to be more compact. In order to pass through, a molding process is required to form a hollow part in the magnet manufacturing process, making it smaller. It is difficult to manufacture large cylindrical magnets. In this invention, the shaft of the motor is By creating a structure that does not pass through the stone, the diameter of the magnet can be reduced and the motor can be made smaller. The purpose is to realize this.

0004

[Means to solve the problem]

This invention is a cylindrical coil in a cylindrical coreless motor, a support for the cylindrical coil, A commutator formed on this support passes through the center of the support and is fixed to the support. In a rotor consisting of a cylindrical housing case, the rotor is A bearing formed at the tip of a cylindrical field magnet fixed at one end and a housing It is supported by a bearing installed in the brush house located at the other end of the brush case. and the shaft is brought out as an output shaft from the side of the housing case opposite to the magnet. It is a coreless motor featuring the following.

[0005]

【Example】

FIG. 1 shows the structure of the coreless motor of the present invention. Cylindrical coil 1 and its coil support A body 2, a commutator 3 embedded in the support, and a shaft 14 fixed to the support. There is a rotor 15 consisting of a shaft which is fixed to the tip of a field magnet 16 It is supported by a bearing 12 attached to a receiver 10 and a brush house 11. on the magnet side bearing. In this case, a conical center hole is formed at the center of the magnet surface to receive the thrust load of the rotor. The shaft is supported via a ball 13.

[0006] Figure 3 shows another embodiment of the present invention, in which (a) a U-shaped jewel bearing 17 is arranged on the magnet surface. , the tip of the shaft is formed into a pointed shape and touches the bearing, and a magnet is placed near the magnet inside the rotor. A steel ring 18 is placed to support the shaft, and (b) a hard plate 19 is placed on the magnet surface. The tip of the shaft is formed into a spherical shape and supports the shaft by abutting against it. There is also a structure in which the holding body and bearing house are integrally molded.

[0007] The magnet 16 is glued to a magnet holder 20, and the magnet holder 20 further forms a magnetic circuit. It is glued to one end of the housing case 7. As shown in Figure 3(c), this magnet holder has a A ring-shaped protrusion 21 is formed on the outer periphery of the part that fits with the housing case. The magnetic part has a self-aligning effect when installed in a holding case. brush house 11 A brush 22 is attached and made of insulating material. Brush house 11 is a housing It is fixed to the other end of the case 7 by adhesive or the like. The lead wire coming out of the brush is the brush house. Take it out from the side. The brush 22 is in a position where it comes into contact with the commutator 3, Supply electricity. The rotor shaft 14 is connected externally from the brush house side as an output shaft. Take it out.

[0008]

[Effect of the idea]

In this invention, the shaft is structured so that it does not pass through the magnet, and the side opposite to the magnet outputs the output. Because it has an axial structure, it is possible to use cylindrical magnets that do not have holes. This makes it possible to reduce the diameter of the stone, which makes it easier to downsize the motor, and also makes it easier to hold the brush. By integrating the body and bearing house, the parts can be made compact. This has made it easier to downsize and manufacture motors. Then, put a strip on the tip of the magnet. By attaching a ball that receives the last load, torque loss due to friction is reduced. Can be done easily. Furthermore, by using a ball or hard disk between the magnet and the bearing, , when gluing the bearing to the end face of the magnet, it is possible to prevent the adhesive from entering the bearing. Ru.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a coreless motor of the present invention.

FIG. 2 is a sectional view of a conventional coreless motor.

FIG. 3 is a sectional view of another embodiment of the coreless motor of the present invention.

[Explanation of symbols]

1 Cylindrical coil 2 Coil support 3 Commutator 4 Shaft 5 Rotor 6 Field magnet 7 Housing case 8 Bearing 9 Bearing 10 Bearing 11 Brush House 12 Bearing 13 balls 14 Shaft 15 Rotor 16 Field magnet 17 U-shaped jewel bearing 18 Magnetic material ring 19 Hard plate 20 Magnet holder 21 Ring-shaped protrusion 22 Brush

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[Procedural amendment]

[Submission date] May 2, 1991

[Procedural amendment 1]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction details]

[Figure 2]

Claims (6)

[Scope of utility model registration request] Claim 1: A rotor comprising a cylindrical coil in a cylindrical coreless motor, a support for the cylindrical coil, a commutator formed on the support, and a shaft passing through the center of the support and fixed to the support. The rotor includes a bearing formed at the tip of a cylindrical field magnet fixed at one end of the cylindrical housing case, and a bearing attached to a brush house disposed at the other end of the housing case. A coreless motor is supported, and the shaft is provided as an output shaft from a housing case side opposite to the magnet. 2. The coreless motor according to claim 1, wherein the magnet side bearing portion has a conical center hole formed in the magnet surface and supports the shaft via a ball. [Claim 3] In the magnet side bearing part, there is a U on the magnet surface.
2. A coreless motor according to claim 1, wherein a jewel-shaped bearing is disposed, the tip of the shaft is formed into a pointed shape and abuts on the bearing, and a magnetic ring is disposed near the inner magnet of the rotor to support the shaft. 4. The coreless motor according to claim 1, wherein a hard plate is disposed on the magnet surface of the magnet-side bearing portion, and the tip of the shaft is formed into a spherical shape and brought into contact with the bearing to support the shaft. 5. The coreless motor according to claim 1, wherein a ring-shaped convex portion is formed on the outer periphery of the portion of the magnet holder that fits into the housing case. 6. The coreless motor according to claim 1, wherein the brush holder and the bearing house are integrally molded.