JPS5943815Y2 - coreless motor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a coreless motor with a built-in cup-shaped ironless core armature, and a support body integrally molded with a cup-shaped frame containing a magnet and its magnetic circuit structure.
The electrical noise that occurs when the static electricity generated in the pulley due to friction between the pulley and belt reaches a certain level or more.The output shaft, bearing, support, and grounded frame. The overall purpose was to prevent electrical noise by discharging electrostatic discharge along the route.

Conventional coreless motors use regular resin molded parts for the support body that is integrally molded with the magnet frame.Since the insulation resistance of the support body made of the above-mentioned resin molded parts is high,
When the static electricity generated in the pulley reaches a certain level when the motor rotates, electrical noise 4 is generated, causing a disturbance in the middle of the sound.

Father: In order to prevent the above-mentioned trouble, as shown in FIG. A pulley (not shown) attached to the output shaft 5
, the metal bearing 4, the metal wire 10, the support 1, and the grounded frame 3, in which the electrostatic dust was completely discharged.

For this reason, the structure becomes complicated, the metal wire assembly process and the number of parts increase, and the cost increases.

In FIG. 1, reference numeral 6 designates a cup-shaped ironless core armature disposed between a yoke 7 attached to the inner surface of the frame and a magnet, and is fixed to the output shaft 5.

Further, 8 is a commutator fixed to the output shaft 5, with which a brush 9 is constantly in contact.

The present invention is intended to eliminate all of the above-mentioned drawbacks of the prior art, and an embodiment thereof will be described with reference to FIGS. 2 and 3.

Note that the base structure is the same as the above-mentioned conventional structure, and its explanation will be omitted.

The feature of the present invention is that the support body 1 is made of a resin molded part.
The static electricity generated in the pulley part is applied to the surface of the frame 3 which is grounded to the pulley (not shown), the output shaft 5, the bearing 4, the support body 1, and the set chassis (not shown). To explain the electrical conductivity of the support 1 made of a resin molded member, the volume resistivity changes by blending all the carbon powder into a normal resin molded member, as shown in Fig. 3. The volume resistivity is 2.2 x 1 when the carbon powder blending ratio exceeds 3.
It stabilizes around 09ΩCm, and has a volume resistivity sufficient for electrostatic discharge.

As is clear from the above explanation, according to the present invention, since the support made of the resin molded member has conductivity of 4, there is no need for metal wires to prevent electrical noise, resulting in a reduction in the number of parts and productivity. It is possible to improve the performance and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional coreless motor, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a characteristic diagram showing the relationship 4 between resin volume resistivity and carbon powder blending ratio. 1...Support, 2...Magnet, 3
...Frame, 4...Bearing, 6...
・Armature.

Claims (1)

[Scope of utility model registration request] In a coreless motor with a built-in cup-shaped ironless core armature,
A cup-shaped frame metal is provided on the outer periphery of the armature, and a bearing washer is provided on a support made of synthetic resin that is integrally molded with the frame and magnets provided inside the armature. A coreless motor characterized by a complete blend of powder.