DRIVING CONTROL FOR DRY VACUUM PUMP, DEVICE THEREOF AND DRY VACUUM PUMP POWER SOURCE DEVICE

摘要

PURPOSE: To start or accelerate an AC motor and a pump completely even when load torque is large for some reason. ;CONSTITUTION: A detector 12 detects load current to an ac motor (forming a part of vacuum pump), where the detected load current is compared with an allowable upper limit, set value. When the detected load current, is judged to be larger than the allow able upper limit, set value, a voltage compensation command is issued to a chopper 8 through an inverter control circuit 10, so that the generated torque TM at an AC motor is raised. It, is possible to start or accelerate the AC motor completely.;COPYRIGHT: (C)1993,JPO&Japio