SPEED CONTROLLER FOR SYNCHRONOUS MOTOR

摘要

PROBLEM TO BE SOLVED: To rotate a motor at high speed in condition that a control system is stable without using a magnetic position sensor and a current sensor.

SOLUTION: This speed controller gets an electrical angle frequency command ω1* from a revolution command ωr*, gets the amount ▵ω1 of revision from the difference between Iq* and Iqc, gets ω1c by adding up ω1* and ▵ω1, gets an AC phase θdc by integrating ▵ω1 by an integrator 8, gets Iqc by sampling the current IO by the detection of a current detector 6 with a current sampler 91 and reproducing an AC current with a current reproducer 32 and converting the coordinates of the reproduced current with a dq coordinate converter 93, based on the AC phase θdc, gets Iq* from Iqc with an Iq generator 10, gets application voltage commands Vdc* and Vqc* with a voltage command computing unit 12, based on Id*, Iq*, and ω1*, gets three-phase AC voltage commands vu*-vw* form the applied voltage with a dq inverter 13, generates a PWM signal with a PWM generator 14, based on the three-phase AC voltage command, and controls the inverter 3 by this PWM signal.

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