Drive control system for sensor-less motor
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United States of America Patent
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-
Aug 3, 2004
Issued Date -
N/A
app pub date -
Jan 14, 2003
filing date -
Dec 12, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive control system, with PLL control, drives a rotatable multi-phase sensor-less motor by switching a current of a field coil of each phase depending on the rotating phase of the motor. When the motor is driven, a desired phase is selected as a detection phase, and a voltage induced on the coil of the detection phase is detected when power is fed for a predetermined time to the field coils other than the detection phase. A magnetic pole position is detected from the amplitude condition of the detected induced voltage. Based on this detection, the power-feeding phase of the motor drive is determined. Power feeding and pole position detection are performed alternately.
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