| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter apparatus capable of changing the superheating protection of semiconductor switching elements in low-speed regions according to the control systems in inverter equipment including at least two kinds of control systems of V/f and vector control systems. <P>SOLUTION: When a control system changing device 11 selects a V/f control circuit 21 and the V/f control system drives the inverter equipment, a current-limiting value i<SB>LIM2</SB>is selected in a current-limiting circuit 80, and a carrier frequency signal f<SB>C2</SB>is selected in a carrier frequency generation circuit 30. Also, when the control system changing device 11 selects a vector control circuit 22 and the vector control system drives the inverter equipment, a current-limiting value i<SB>LIM1</SB>is selected in the current-limiting circuit 80, and a carrier frequency signal f<SB>C1</SB>is selected in the carrier frequency generation circuit 30. <P>COPYRIGHT: (C)2011,JPO&INPIT |
