| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent demagnetization caused by the flow of an excessively large current to a motor by reliably detecting a failure in an AC power supply. <P>SOLUTION: The motor control device includes: a rectifying circuit 3 which rectifies an AC power supply voltage; a reactor 2 connected to the rectifying circuit 3; a capacitor 4 connected to an output of the rectifying circuit 3; an inverter 5 which outputs an AC voltage; the motor 6 driven by the inverter 5; an inverter control means 20 which operates and outputs a drive signal to the inverter 5 in order to drive the motor 6; a power supply phase detection means 21 which detects a power supply phase of an AC power supply 1; and a rectified voltage detection means 22 which detects an output voltage value of the rectifying circuit 3, and compares magnitudes of the detected voltage value and a reference voltage value. When a value detected by the rectified voltage detection means 22 has been detected to be smaller than the preset reference voltage value when the power supply phase detected by the power supply phase detection means 21 reaches a prescribed value, the inverter control means 20 outputs a stop command to the inverter 5 to stop the motor 6. <P>COPYRIGHT: (C)2009,JPO&INPIT |
