Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1996-08-23
1998-07-07
Masih, Karen
Electricity: motive power systems
Limitation of motor load, current, torque or force
318560, 318569, 318138, 318254, 361 23, 361139, 364483, 364550, H01R 3946
Patent
active
057774480
ABSTRACT:
A circuit controls a brushless DC motor having a magnetic rotor and a stator coil. The circuit has a switching element for switching a current to the stator coil to rotate the rotor. The circuit compares a voltage induced in the motor with a neutral voltage of a DC power source with no delay to provide a positional detection signal. The circuit has a one-chip microcomputer for examining a PWM waveform signal used to generate a synchronous signal and the switching timing of the switching element. The microcomputer samples the positional detection signal only during intervals in which a current is supplied to the stator coil, and carries out other processes during intervals in which no current is supplied to the stator coil.
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Kabushiki Kaisha Toshiba
Masih Karen
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