SYNCHRONOUS MOTOR DRIVING DEVICE, CONTROL METHOD FOR SYNCHRONOUS MOTOR DRIVING DEVICE, REFRIGERATOR-FREEZER, AND AIR CONDITIONER

摘要

PROBLEM TO BE SOLVED: To provide a synchronous motor driving device wherein rectangular wave excitation in which any excitation width between 120° and 180° inclusive is selectable and sine wave excitation can be accomplished by one piece of circuitry, and the excitation wave form can be changed in a very short time according to driving conditions (high-efficiency driving conditions, low-noise driving conditions) required for a synchronous motor to be driven.

SOLUTION: The synchronous motor driving device is used to drive a synchronous motor through an inverter device. The driving device comprises: an output voltage vector computing means that determines the output voltage vector outputted by the inverter device according to a command value of rotational speed; a rectangular wave exciting means that outputs voltage in rectangular waveform with any excitation width between 120° and 180° inclusive according to the output voltage vector; a sine wave exciting means that outputs voltage by sine waveform excitation according to the output voltage vector; and an excitation waveform selecting means that selects an excitation method and an excitation width according to conditions required in driving the synchronous motor.

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