Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1994-08-03
1997-01-28
Sircus, Brian
Electricity: motive power systems
Open-loop stepping motor control systems
318805, 368157, H02K 2904
Patent
active
055980783
ABSTRACT:
A device for detecting asynchronization or stepping out of a stepping motor without making the stepping motor large in size. Parallel resonance circuit LC is provided in a recovery circuit of stator coil RL of the stepping motor for detecting linking current IX. If the stepping motor is out of step, the magnetic resistance between stator and rotor increases while the reactance of stator coil RL decreases. When motor drive current ID is turned off, a large transient current is momentarily generated yet is quickly dampened. While the motor drive current ID is off, linking current IX approaches zero. Consequently, if the stepping motor is out of step, there is no substantial difference in the linking current IX when motor drive current ID is turned on from when motor drive current ID was off. Also, the amplitude of the transient or resonance waveform is smaller than the amplitude when the stepping motor is operating normally. By thus detecting the resonance waveform of the parallel resonance circuit when motor drive current ID is turned on, it can be precisely determined whether or not the stepping motor is out of step.
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Sircus Brian
TRW Steering Systems Japan Co. Ltd.
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