| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce noise and vibration on positioning an inverter detecting a phase current by a current sensor disposed in between a DC power supply and the inverter. <P>SOLUTION: The inverter is equipped with an inverter circuit having an upper-arm switching element connected to the plus side of a DC supply, and a low-arm switching element connected to the minus side of the supply; a current sensor to detect the current between the DC supply and the inverter circuit; and a controlling circuit to make the inverter circuit output a driving current to the motor. The controlling circuit makes the inverter circuit output the DC current to the motor through a PWM energization; and at the same time corrects the energization only just after stabilization of the positioning current to detect the phase current by means of the current sensor, when positioning the magnetic rotor before operating the motor. <P>COPYRIGHT: (C)2010,JPO&INPIT |
