Spindle motor stop control device

Details Spindle motor stop control device Spindle motor stop control device

1988-12-19

1990-05-22

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318362, H02K 500

Patent

active

049280449

ABSTRACT:
A spindle motor stop control device applies a reverse torque braking force to the spindle motor to effect stopping of the motor. A speed detector detects when the number of rotation of the motor has slowed to 1
of a predetermined number of rotation and issues a detection signal. The time period beginning with the application of the reverse torque braking force until the issuance of the detection signal is measured. Then, a time period t=T/(n-1) is calculated and the reverse torque braking force is continued for the time, t, and then removed.

REFERENCES:
patent: 3868557 (1975-02-01), Scott
patent: 3968414 (1976-07-01), Konrod
patent: 4325011 (1982-04-01), Peterson
patent: 4468599 (1984-08-01), Berman et al.
patent: 4546298 (1985-10-01), Wickham et al.
patent: 4587468 (1986-05-01), Hutta
patent: 4604655 (1986-08-01), Moriyama
patent: 4742282 (1988-05-01), Okutani et al.
patent: 4761692 (1988-08-01), Yoshida et al.
patent: 4768104 (1988-08-01), Kanamaru
patent: 4782402 (1988-11-01), Kanamaru

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