| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform sensorless sine wave driving of a motor by V/f control. <P>SOLUTION: DC power from a DC power supply 2 is converted by an inverter circuit 3 into an AC power in order to drive a motor 4 and to rotary drive a motor load 5. A current detection means 6 detects a motor current dependent on the peak value of motor current or the rotary magnetic field, and a control means 7 controls the output voltage or the output voltage and the frequency of the inverter circuit 3 to have predetermined values. <P>COPYRIGHT: (C)2008,JPO&INPIT |
