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Apparatus for controlling a permanent magnet AC synchronous motor supplied by a forced commutated inverter that does not use a mechanical shaft position sensor. A control loop regulates an inverter frequency and maintains inverter synchronism with the motor using electrical angle feedback signals de

Apparatus for controlling a permanent magnet AC synchronous motor supplied by a forced commutated inverter that does not use a mechanical shaft position sensor. A control loop regulates an inverter frequency and maintains inverter synchronism with the motor using electrical angle feedback signals developed from measured flux signals that have been phase shifted.

대표청구항 ▼

A control system for regulating a frequency command to an alternating power source supplying a permanent magnet motor comprising: means for measuring the motor flux phasor; means for rotating said motor flux phasor through a predetermined electrical angle; means for generating an angle feedback sign

A control system for regulating a frequency command to an alternating power source supplying a permanent magnet motor comprising: means for measuring the motor flux phasor; means for rotating said motor flux phasor through a predetermined electrical angle; means for generating an angle feedback signal dependent on the angle difference between the rotated flux phasor and the stator current phasor, said angle feedback signal varying monotonically during motor operation in the lagging and leading power factor mode; means for generating an angle command dependent on the difference between an operator commanded torque and actual machine torque; and means for comparing said commanded angle signal to said angle feedback signal for generating a frequency command for said alternating power source.