Control method and apparatus for driving a head drum assembly of

Details Control method and apparatus for driving a head drum assembly of Control method and apparatus for driving a head drum assembly of

1998-04-29

2000-10-31

Masih, Karen

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318245, H02K 2300

Patent

active

06140781&

ABSTRACT:
A control method and an apparatus for precisely driving a motor of a head drum assembly by using impulse generation magnets in a video cassette recorder is disclosed. While a displacement of a hall sensor installed on a stator side is produced with respect to magnetic fluxes generated from impulse generation magnets installed on frequency generator magnets of a rotor, an impulse detection signal is supplied from the hall sensor. After a zero-crossing signal obtained by executing a zero-crossing detecting process with respect to the impulse detection signal is compared by a driving controller with a count signal obtained by counting a pulse number of the impulse detection signal, a next drive order of a switching section for driving the motor with reference to a present position of rotary magnets of the rotor is determined, and a rotational position of the motor is precisely controlled according to the rotational speed control signal which is computed on the basis of the determined drive order. Consequently, an operating reliability of the motor is improved. Also, a number of the hall sensors for detecting a rotational position of the motor is reduced, thereby reducing a unit cost of manufacturing.

REFERENCES:
patent: 4672274 (1987-06-01), Suganuma
patent: 5089733 (1992-02-01), Fukuoka
patent: 5907225 (1999-05-01), Kim
patent: 5998946 (1999-12-01), Kim

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