| 摘要 |
PURPOSE:To contrive a device to share a load almost uniformly, by controlling an inverter in case that a driving device is partially renewed to drive the inverter on the load in which load sharing and variable-speed control is conducted by secondary resistance control. CONSTITUTION:An IM 4 for secondary resistance control and an IM 5 for inverter control are directly connected to the same machine shaft to bear a load 12. By a secondary resistance command circuit 8, the speed command signal of output generated from a running speed setting device 7 is compared with an actual rotational speed detected by a rotational speed detector 3, and a secondary resistance value is selected, and command is directed to a secondary contactor 2. By an output torque arithmetic circuit 9, arithmetic is performed on the actual torque of the secondary resistance control IM 4 through the resistance value and an actual rotational speed. From a frequency reference generating circuit 10, the reference frequency of an inverter 11 is generated through actual torque and the actual rotational speed. |
