Controller of a stepping motor, control method for the motor and

Details Controller of a stepping motor, control method for the motor and Controller of a stepping motor, control method for the motor and

1998-11-04

2000-10-24

Ip, Paul

Electricity: motive power systems

Positional servo systems

Vehicular guidance systems with single axis control

318696, 368217, 368188, H02P 800, G04C 300

Patent

active

061372528

ABSTRACT:
A power-saving controller for controlling a stepping motor mounted in an electronic wristwatch. A pulse signal generator in the controller combines two pulse signals GPi and GPi+2 having different duty factors using a compositing signal CP, based on a reference signal BP, thereby compositing a pulse signal GPi+1 having an intermediate duty factor. Even if the frequency of the reference signal BP is lowered, a step size for controlling the duty factor of a drive pulse is prevented from expanding, thereby keeping the driving power required by the stepping motor from increasing. The lowering of the frequency of the reference signal BP reduces the power consumption of the circuit of the wristwatch, and thus of the controller.

REFERENCES:
patent: 3945191 (1976-03-01), Van Berkum
patent: 4549230 (1985-10-01), Odaka
patent: 4727468 (1988-02-01), Maekawa
patent: 4866237 (1989-09-01), Inoue
patent: 5068586 (1991-11-01), Kawahara
patent: 5231343 (1993-07-01), Nakamura

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