| 摘要 |
The present invention provides a high-reliability motor drive device, a fluid compression system and an air conditioner. The motor drive device comprises an element short-circuit protection unit (12) which stops the drive of a switching element when a current input from a current detector (20) exceeds a short-circuit protection threshold for preventing short-circuit in an inverter circuit (11). An inverter control unit (40) presumes the current of a motor (M) according the current input from the current detector (20), and performs a process of stopping the drive of the switching element when the current of the motor exceeds other current thresholds related to temperature protection of the switching element and/or demagnetization protection of the motor (M). The processing of the element short-circuit protection unit (12) is carried out without the intervention of a micro computer, and the processing of the inverter control unit (40) is carried out with the intervention of the micro computer. |
