Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1997-05-12
1999-11-09
Martin, David
Electricity: motive power systems
Limitation of motor load, current, torque or force
388815, 388903, 361 31, 361 87, H02K 1732
Patent
active
059821205
ABSTRACT:
A library apparatus having a motor driving control circuit including a processor, a motor driver circuit, a relay, a motor abnormal condition detection circuit, a current control circuit, an excess current detection circuit, and an abnormal current monitor circuit. The motor abnormal condition detection circuit is connected to the motor driver circuit, and detects an abnormal condition of at least one of the motor and the motor driver circuit. Upon detecting an abnormal condition, the motor abnormal condition detection circuit outputs a motor abnormal condition detection signal which prompts the current control circuit to regulate the current flowing through the motor driver circuit. If the current control circuit is unsuccessful, the excess current detection circuit outputs an excess current detection signal which triggers the relay to close the power source circuit of the motor driver circuit.
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Akiyama Yoshiki
Inazawa Katsumi
Miyaguchi Ryuuichi
Ohmido Tatsuya
Ono Hitomi
Fujitsu Limited
Martin David
LandOfFree
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