Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Reexamination Certificate
2003-12-18
2008-09-30
McCloud, Renata (Department: 2837)
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
C318S696000, C318S400010
Reexamination Certificate
active
07429846
ABSTRACT:
A stepping motor control apparatus that is able to electrically detect the load of the stepping motor and effectively prevent step-outs by means of an inexpensive configuration. The stepping motor control apparatus is equipped with a microcomputer (10) that outputs a command pulse, a chopper-type constant current driver (20) that outputs a drive current that corresponds to the input command pulse to the stepping motor (5) and outputs a chopper signal to keep the output drive current fixed, and a load detection circuit (30) that detects the chopper signal to detect the load of the stepping motor (5). The load detection circuit (30) is equipped with a waveform shaping circuit (50) that makes the chopper signal waveform continuous to convert it to a pulse or voltage, and it detects the load of the stepping motor by means of the width of the pulse or the voltage value.
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McCloud Renata
Minebea Co. Ltd.
Townsend and Townsend / and Crew LLP
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