Apparatus for driving stepping motor

Details Apparatus for driving stepping motor Apparatus for driving stepping motor

1995-09-18

1998-10-20

Cabeca, John W.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318671, 364174, H02K 2904

Patent

active

058251510

ABSTRACT:
According to the present invention, a stepping motor driving apparatus having a rotor and a stator in n (an integer equal to or larger than 2) phases for moving a moving body is provided. The stepping motor driving apparatus includes a driver for selectively supplying to the stator a first current pattern for rotating the rotor at a first pitch and a second current pattern for rotating the rotor at a second pitch different from the first pitch based on a drive switching signal. The driver switches the first current pattern and the second current pattern at a point where a torque generated by the first current pattern is equal to a torque generated by the second current pattern and supplies the first current pattern or the second current pattern to the stator.

REFERENCES:
patent: 4446412 (1984-05-01), Friedman et al.
patent: 4477756 (1984-10-01), Moriguchi
patent: 4612588 (1986-09-01), Tsukahara
patent: 4631657 (1986-12-01), Hil et al.
patent: 5006773 (1991-04-01), Goldberg
patent: 5231343 (1993-07-01), Nakamura
patent: 5459386 (1995-10-01), Okachi et al.
patent: 5504404 (1996-04-01), Tamaki et al.
patent: 5600221 (1997-02-01), Tomatsuri et al.

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