Claw-pole stepping motor with rotor including vibration reducing

Details Claw-pole stepping motor with rotor including vibration reducing Claw-pole stepping motor with rotor including vibration reducing

1997-11-13

2000-10-17

Tamai, Karl

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310257, H02K 2114, H02K 127

Patent

active

061336556

ABSTRACT:
A claw-pole stepping motor with rotor, including a vibration reducing magnet. Vibration in the axial direction is suppressed by having a correction force, which overcomes a force produced by a vertical motion caused when the rotor is pulse-driven, and keeps the rotor attracted to one side. The corrective force is generated between an index generating magnetized portion in a lower area of the rotor and a soft magnetic material base. Magnetic flux leakage produced by the excitation of the stator coils of the motor is suppressed by providing a shield ring made of a magnetic material on an inner side of the rotor magnet, which minimizes the magnetic flux flowing from the coils to the revolving shaft, and noises on the recording and reproducing head are thereby greatly reduced.

REFERENCES:
patent: 4363984 (1982-12-01), Torii et al.
patent: 4570093 (1986-02-01), Morii et al.
patent: 4782255 (1988-11-01), Oosaka et al.
patent: 4818907 (1989-04-01), Shirotori
patent: 4851731 (1989-07-01), Saotome et al.
patent: 5408153 (1995-04-01), Imai et al.

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