Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1998-09-09
1999-11-02
Ip, Paul
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 318138, H02P 700, H02R 3946
Patent
active
059777346
ABSTRACT:
A circuit for determining an initial winding combination for motor startup of a polyphase dc motor having a transistor driver circuit comprising a plurality of high side winding drivers and low side winding drivers operably connected to first and second voltage sources comprises a current mirror circuit and a plurality of sense FETs each operably connected between one of the voltage sources and the gate of one of the winding driver transistors in each phase combination. The sense FETs are operably connected to one side of the current mirror circuit. The mirror circuit compares the current through the sense FET with a current threshold provided on the other side of the current mirror and produces an output signal when the threshold is reached. At the same time, the time to reach the threshold is measured and the phase combination having the longest time is stored. Also when the threshold is reached, the sequencer advances to the next phase combination for measurement until all phase combination have been sequenced. The motor is then started with the phase combination having the longest time measurement energized first.
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Lu Li-Hsin David
Nguyen Chinh Dac
Yu Francis
Galanthay Theodore E.
Ip Paul
Jorgenson Lisa K.
STMicroelectronics Inc.
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