| 摘要 |
PROBLEM TO BE SOLVED: To enable a safe operation by preventing the overload of a power source unit even in the case of a service interruption over a long time and reducing a shock of a hysteresis motor(HM). SOLUTION: This motor control equipment is provided with a VVVF 2 which converts a power source output into power of a variable voltage and variable frequency and supplies the power to a plurality of the hysteresis motors(HM) 3, filter circuits 9 which are installed via loading switches 4 in a plurality of electrical paths where the output side of the VVVF 2 are divided into groups, a common counter- electromotive force detecting circuit 13 of the HM 3 connected with a common bus part of each of the electrical paths, and a control means for controlling the VVVF 2, the switch 4 and the filter circuit 9. The control means has functions to give an operation stop signal to the VVVF 2 in the case of a service interruption of the power source, to give an off-signal to the filter circuit 9, to maintain each of the switches 4 to be in an on-state, and to decrease the speed of all the HMs 3. The control means has a function of setting an output of the VVVF 2 on the basis of the number of revolutions detected from the counter-electromotive force of the HM 3 during deceleration and perform a service interruption restart when a power service is restored. |
