Stepping motor driver

Details Stepping motor driver Stepping motor driver

2005-05-24

2005-05-24

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

Reexamination Certificate

active

06897633

ABSTRACT:
A stepping motor driver which drives a stepping motor for position and speed control. The stepping motor driver comprises: a current control means which outputs values corresponding to applied voltages; current sensors which detect phase currents; and a magnetic pole position estimation unit which uses the values corresponding to applied voltages and detected phase current values as outputs of the current sensors to obtain a magnetic pole position estimate. The magnetic pole position estimation unit calculates a magnetic pole position estimate from speed electromotive force estimates or from differences between phase currents at zero speed and detected phase current values.

REFERENCES:
patent: 4477757 (1984-10-01), Palombo et al.
patent: 4506206 (1985-03-01), Thommen
patent: 4536691 (1985-08-01), Sakakibara
patent: 4734631 (1988-03-01), Kamikura et al.
patent: 5691613 (1997-11-01), Gutwillinger
patent: 6271641 (2001-08-01), Yasohara et al.
patent: WO 0004632 (1999-07-01), None

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