Stepping motor driving apparatus

Details Stepping motor driving apparatus Stepping motor driving apparatus

1998-06-08

1999-05-04

Sircus, Brian

Electricity: motive power systems

Open-loop stepping motor control systems

318599, 318603, H02P 800

Patent

active

059007117

ABSTRACT:
A stepping motor driving apparatus comprising: a stepping motor; a pointer which is operatively associated with rotation of the stepping motor; a sensor for detecting a stop position of the stepping motor; an updown counter for outputting a count corresponding to a position of a rotor of the stepping motor; a ROM for storing data on an excitation signal corresponding to the count of the updown counter; a digital-to-analog converter for converting the data of the ROM into a voltage signal; a drive amplifier for amplifying the voltage signal of the digital-to-analog converter so as to drive the stepping motor; a NAND circuit which seeks a non-conjunction of a sensor signal from the sensor and a signal outputted, when the count of the updown counter is "0", by the updown counter so as to output a mask signal; and an AND circuit which seeks a logical product of the mask signal of the NAND circuit and a clock signal inputted from outside so as to output a drive clock signal to the updown counter.

REFERENCES:
patent: 4827200 (1989-05-01), Ogura et al.
patent: 5252903 (1993-10-01), Maruyama
patent: 5333371 (1994-08-01), Mittenbuhler et al.
patent: 5418443 (1995-05-01), Kikuchi
patent: 5466997 (1995-11-01), Utenick et al.
patent: 5532567 (1996-07-01), Iwasaki et al.
patent: 5723964 (1998-03-01), Nakaba

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