| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an inverter control device for driving a DC motor, capable of being constantly stably operated with the utmost capability without being affected by the specifications of the DC motor while a trip of a power supply circuit breaker is prevented. <P>SOLUTION: A microcomputer 8 includes a current limit value storage unit 11 that stores a limit value of the current of a commercial AC power supply as a primary current limit value, an operation limit current value computation unit 15 that computes a limit current value with which a DC motor 7 can be normally operated based on the output of a step-out detection means 17 and the output of a primary current detection means 9, a current limit value computation unit 12 that compares a primary current limit value stored in the current limit value storage unit 11 with the output of the operation limit current value computation unit 15 and outputs the lower value as a current limit value for the current supplied to the DC motor 7, an operation frequency computation unit 13 that determines an operation frequency so that the output of the current limit value computation unit 12 is obtained, and a waveform generation unit 14 that outputs a driving signal adapted to the output of the operation frequency computation unit 13 to an inverter unit 6. <P>COPYRIGHT: (C)2011,JPO&INPIT |
