Motor tracking control system
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United States of America Patent
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Apr 15, 2003
Grant Date -
Jan 30, 2003
app pub date -
Jul 12, 2001
filing date -
Jul 12, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An electronic circuit and software control methodology tracks motor position in a motor drive system. High power consumption position transducers, such as inductive sensors or optical encoders, can be controlled in a variable active duty cycle mode to reduce power and yet maintain motor position information while the main power is off. A lower power battery backup circuit is implemented as a secondary power source, and is automatically brought in operation when the main power supply is disabled. A dedicated control circuit operates during AC power outages, and the circuit average power can be controlled to a minimal rate, based on the rate of change of motor position. The motor can be externally driven, up to a defined limit speed, without losing its actual position information.
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