| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter apparatus and an inverter system to operate a single-phase induction motor with high efficiency. <P>SOLUTION: A frequency command forming means 18 decides an operation frequency f according to an external command, and an operation command forming means 19 forms a voltage amplitude VA of an auxiliary winding 15, a voltage amplitude VB of a main winding 16, and a voltage phase difference θ between the main winding 16 and the auxiliary winding 15 based on the operation frequency f. A two-phase voltage command operating means 20 operates voltage commands A, B and N based on the voltage amplitudes VA and VB and the voltage phase difference θ. An output voltage operating means 21 operates output voltages U, V and W of arms 13u, 13v and 13w as relative values regarding a minimum value of the voltage commands A, B and N as reference. A PWM conversion means 23 generates PWM signals Dup to Dwn based on the output voltages U, V and W and a direct-current voltage Vdc detected by a direct-current voltage detecting means 22. <P>COPYRIGHT: (C)2010,JPO&INPIT |
