Field orientation control of a permanent magnet motor

Details Field orientation control of a permanent magnet motor Field orientation control of a permanent magnet motor

H - Electricity

02

P

318/98

H02P 6/00 (2006.01) H02P 6/08 (2006.01)

Patent

CA 1290388

FIELD ORIENTATION CONTROL OF A PERMANENT MAGNET MOTOR Abstract of the Disclosure A field orientation control system for an interior permanent magnet synchronous motor includes function generating means responsive to a torque command signal for producing direct and quadrature axis direct current signals which are converted to synchronously-varying two-phase signals for coupling to power control means, for effecting sinusoidal energization of the permanent magnet motor. The function generators modify the torque command signal as a predetermined function of the motor parameters. Rotor position information is derived from measured stator voltages and currents without the use of a separate rotor position sensor. The control system includes means for establishing a preselected amplitude of stator .alpha.-axis current in the motor at start-up prior to establishing orthogonal .beta.-axis current such that the motor rotor is caused to become initially aligned with the selected .alpha.-axis.

584732

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