| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter device that attains both high controllability and low noise, and detects a phase current from a current of a DC power supply line. <P>SOLUTION: The inverter device includes an inverter circuit, a current detector which detects a current between the DC power source and the inverter circuit, and a control circuit which makes the inverter circuit output an AC current to a motor by feeding electricity for PWM modulation, and corrects the electricity feeding to detect a phase current by the current detector. The control circuit detects a phase current of two or more phases in every carrier cycle when a speed command value of the motor is equal to or larger than a predetermined speed and when the speed command value of the motor is smaller than the predetermined speed and necessary torque is equal to or larger than predetermined torque, and detects a phase current of two phases in two carrier cycles when the speed command value of the motor is smaller than the predetermined speed and the necessary torque is smaller than the predetermined torque. <P>COPYRIGHT: (C)2012,JPO&INPIT |
