Drive control device of motor and a method of start-up
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United States of America Patent
Stats
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May 25, 2010
Grant Date -
May 1, 2008
app pub date -
Oct 12, 2007
filing date -
Oct 31, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor drive control device and motor startup method prevent startup noise and reduce startup time. At startup, a current to which a rotor does not react is passed through two phase coils of a polyphase DC motor in succession, and a voltage polarity induced in a non-conducting phase is detected. A first operation decodes the detected signal, and determines phase coils of the motor through which a current should pass to rotate the rotor and the energization direction. A second operation forms a control signal for passing a current according to the determination to drive the motor, detects a voltage peak induced in the non-conducting phase during the drive, and performs switching control of a conducting phase. In normal operation, the position of the rotor is detected based on a back EMF in each phase, and rotation control is performed.
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