CONTROLLER FOR INVERTER

摘要

PROBLEM TO BE SOLVED: To compensate for an output voltage error Vtd caused by a short-circuit preventing period of an output voltage of an inverter 1 without discriminating the polarity of the output current of the inverter 1.

SOLUTION: A controller 100A includes a PWM output device 14 for outputting a PWM signal to the inverter 1 which converts a DC power into a three-phase electric power, and outputs it to a three-phase electric motor 2; a current controller 10 for calculating a command value V*dq of the output voltage of the inverter 1 in a rotational coordinate system, on the basis of the detected current value iαβ and the command current value i* of the inverter 1; a dead time compensation device 13a for correcting the command value V*dq of the output voltage in the rotational coordinate system to determine a compensation voltage value V*dq+ΔVdq, on the basis of a phase value θi of a command current value Idq; and coordinate conversion devices 11, 12 for performing coordinate transform of the compensation voltage value V*dq+ΔVdq from the rotational coordinate system to a three-phase fixed coordinate system to give it to the inverter 1.

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