| 摘要 |
The invention provides a control apparatus of an AC motor and a refrigerating and air conditioning apparatus using the same. According the invention, a DC bus current can be correctly detected and the AC motor can be driven in high performance, even in the case of a low modulation rate such as using the AC motor in a low-load or low-speed region. The control apparatus of the AC motor comprises a DC power supply; an inverter which converts a direct current provided by the DC power supply into an alternating current; a control circuit of the inverter for controlling the switching elements of the inverter; a DC-bus current detector for detecting a DC bus current flowing in the inverter; a low pass filter for smoothing the DC bus current detected by the DC-bus current detector; and a corrector for correcting attenuation amount of the DC bus current smoothed by the low pass filter. |
