Drive circuit for stepping motor

Details Drive circuit for stepping motor Drive circuit for stepping motor

1988-01-26

1989-08-15

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

048578177

ABSTRACT:
In this invention, an excitation current is switched in accordance with a change in number of phases so as to reduce an excitation current per phase in a 2-phase mode to be smaller than that in a 1-phase mode. The excitation current in the 2-phase mode is set to be about 0.6 to 0.8 times larger than that in the 1-phase mode, so that a constant torque is always generated.

REFERENCES:
patent: 3757193 (1973-09-01), Inaba et al.
patent: 4389605 (1983-06-01), Noda
patent: 4639084 (1987-01-01), Kugioka
patent: 4642544 (1987-02-01), Furumura et al.

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