Field-oriented control for brushless DC motor
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United States of America Patent
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N/A
Issued Date -
Dec 1, 2005
app pub date -
May 28, 2004
filing date -
May 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A control system for a brushless DC motor, preferably used in a power steering system in a vehicle. Presently delivered torque is computed without measuring currents in the motor. A demanded torque signal is received, and a torque error signal is produced. The torque error signal is modified by an inertial torque component, if the motor is accelerating. In response to the modified error signal, the control system first attempts to increase motor torque by increasing motor voltage, if that is possible, without increasing magnetic field which is parallel with the magnetic field of the rotor. If that is not possible, then motor voltage is held fixed, and the magnetic field just mentioned is increased.
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