Stepping motor control apparatus

Details Stepping motor control apparatus Stepping motor control apparatus

1988-08-25

1989-11-21

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, G02P 800

Patent

active

048825301

ABSTRACT:
In an all-phase de-energized state of the stepping motor, all motor windings having different phases are energized. After the all-phase de-energized state is detected, the motor windings are sequentially energized in accordance with predetermined phase energization patterns. Each of the energizations of the motor windings lasts for a given interval chosen to allow the stepping motor to generate a starting torque greater than a maximal load torque. After energizations of the motor windings corresponding to one cycle of the phase energization patterns are completed, durations of the energizations of the motor windings are gradually shortened to increase a rotational speed of the stepping motor.

REFERENCES:
patent: 3896363 (1975-07-01), Kinsel et al.
patent: 4285319 (1981-08-01), Hattori et al.
patent: 4300085 (1981-11-01), Monma et al.
patent: 4347821 (1982-09-01), Saito
patent: 4380985 (1983-04-01), Otsuka et al.
patent: 4541378 (1985-09-01), Kitamura

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