| 摘要 |
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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