| 摘要 |
PROBLEM TO BE SOLVED: To materialize stable start and rotation control even if ripple of load, input voltage, etc., exists. SOLUTION: This inverter device is equipped with a reference voltage storage means 15 which stores the reference value of the relation between the output voltage to be applied to a motor and the output frequency, and in this device a revolution control means 12 outputs the output voltage based on this reference voltage, and changes it on occasion whereby even in case that the operation conditions fluctuate, the revolutions of a motor quickly becomes stable, and it is controlled to be the desired objective revolutions. Furthermore, this is equipped with an input voltage detection means 14, and the revolution control means 12 smooths the start of the motor by changing the output pulse width according to the fluctuation, even if the detected input voltage fluctuates, and the revolutions is controlled stably. Furthermore, the compatibility of stable start and calm operation is materialized by switching the carrier frequency when the revolutions gets over the predetermined revolutions. |
