JPS6245506Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coreless motor.
The conventional coreless motor, as shown in Figure 1,
A magnet fixing base 15 is fitted into a stepped portion 1a formed at one side opening of a cylindrical case 1 with openings at both ends, and one end of the cylindrical bearing 3 is inserted into a fitting hole 15a formed at the center of the magnet fixing base 15. A cylindrical magnet 5 is fitted into the bearing 3 and placed between the inner circumferential surface of the case 1 and the outer circumferential surface of the magnet 5. Cylindrical lotus coil 8 in gap 7
The magnet 5 is attached to the case 1 via two parts, the bearing 3 and the magnet fixing base 15.
Since it is fixed in a cantilevered state, it is difficult to obtain accurate concentricity between the magnet 5 and the case 1, and the gap 7 between the two may become partially interposed, resulting in a decrease in motor performance, or in extreme cases. In case 1, low coil 8
There was a problem in that the magnet 5 hit the inner circumferential surface of the magnet 5 or the outer circumferential surface of the magnet 5, making it impossible to rotate. In particular, since the stepped portion 1a of the case 1 is formed by cutting,
Accurate concentricity with the inner circumferential surface of the case cannot be obtained, and this is compounded by dimensional variations between the outer circumferential surface of the magnet fixing base 15 that fits into the stepped portion 1a and the fitting hole 15a that fits the bearing 3, resulting in eccentricity. The quantity was increasing.

The present invention was developed in view of the above problems, and an object of the present invention is to provide a coreless motor that improves the concentricity between the case and the magnet, eliminates the rotor coil's inability to rotate, and improves motor performance.

Embodiments of the present invention will be described below based on the drawings.
1 is a cylindrical case with a bottom, a cylindrical body 2 is integrally extended from the bottom surface on a concentric axis toward the inside of the case 1 by drawing processing, and a cylindrical bearing 3 is fitted at one end into the cylindrical body 2. The rotary shaft 4 is disposed on a concentric shaft within the case 1, and a rotating shaft 4 is pivotally supported on the bearing 3. Also,
The cylindrical magnet 5 has one end in contact with the tip of the cylindrical body 2 for axial positioning.
and is fixed with adhesive 6. A gap 7 is formed between the outer circumferential surface of the magnet 5 and the inner circumferential surface of the case 1, and a cylindrical rotor coil 8 is rotatably disposed in the gap 7. There is a space 1 between the cylindrical body 2 and the case 1, which is larger than the conventional example.
4 is formed, and one end of the rotor coil 8 is disposed within the space 14, which is a dead space, thereby shortening the length of the motor. The other end of the rotor coil 8 is connected to the rotating shaft 4 via a bush 9 and is provided with a cylindrical commutator 10. Further, a brush stand 11 is fitted into the open end of the case 1, and the brush stand 11 is provided with a brush 13 connected to a terminal 12 protruding outside the case, and the brush 13 is connected to the cylinder. It is arranged to be in sliding contact with the commutator 10.

In the above embodiment, the cylindrical body 2 extends only toward the inside of the case, but the cylindrical body 2 may extend toward the outside of the case. In this case, the bearing 3 can be held more securely, and the motor can be can be made smaller.

As described above, in the present invention, a cylindrical body is integrally extended from the bottom of a bottomed cylindrical case on a concentric axis, and a cylindrical bearing that pivotally supports a rotating shaft is fitted into the cylindrical body at one end. A cylindrical magnet is arranged on a concentric axis in the case, and one end surface of a cylindrical magnet is brought into contact with the tip of the cylindrical body, and a gap is provided between the outer circumferential surface of the magnet and the inner circumferential surface of the case. A coreless motor, characterized in that a cylindrical rotor coil fitted and connected to the rotating shaft and provided with a commutator is rotatably arranged in the gap, the coreless motor integrally extending from the bottom of the case. Since the bearing is directly fixed to the cylindrical body and the magnet is fitted to the bearing, there is no need for the conventional magnet fixing stand, and the concentricity between the magnet and the case is improved, allowing the outer circumferential surface of the magnet and the inner circumferential surface of the case to be The gap between the cylinder and the cylinder body becomes uniform, the rotor coil does not touch the inner circumferential surface of the case, and the rotor does not become unable to rotate.Also, by touching one end of the magnet to the cylinder, the magnet can be positioned at a predetermined position. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view of an embodiment of the present invention. 1...Case, 2...Cylinder, 3...Bearing, 4...
... Rotating shaft, 5 ... Magnet, 7 ... Gap, 8 ... Rotor coil, 14 ... Space part.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical body is integrally extended from the bottom of a bottomed cylindrical case on a concentric axis, and one end of the cylindrical bearing that supports the rotating shaft is fitted into the cylindrical body. A cylindrical magnet is disposed on a concentric axis in the case, and one end surface of a cylindrical magnet is brought into contact with the tip of the cylindrical body, and a gap is provided between the outer peripheral surface of the magnet and the inner peripheral surface of the case. 1. A coreless motor, comprising: a cylindrical rotor coil fitted into the gap, connected to the rotating shaft, and provided with a commutator, rotatably disposed in the gap. 2. The coreless motor according to claim 1, characterized in that a space is formed between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the case, and one end of the rotor coil is disposed within the space. .