| 摘要 |
<p>If rev count of a motor becomes high speed at the state that PWM pulse number is regular, the PWM pulse number including a voltage-current 1 cycle is fewer than low speed. Therefore, the output of an element in which induced voltage high-order element is big gets in trouble. The purpose of the present invention is to prevent a situation that a current wave form is distorted by not outputting a high-order element. To solve the problem, a motor driving device of the present invention comprises; a power converter for driving a permanent magnet motor; a control device for controlling output voltage of the power converter; and a voltage adding part which adds the high-order element of the induced voltage to a voltage command value of the control device. The higher the rev count of the permanent magnet motor, the lower degree of the high-order element of the induced voltage added to the voltage command value of the control device. [Reference numerals] (10) Voltage additional part;(42) Gate·driver;(7) PWM pulse producing part;(8) Vector control part;(9) Induced voltage high-order element producing part</p> |
