| 摘要 |
PURPOSE:To make it possible to deal with a plurality of motors having different characteristics by a constitution wherein a first inverter is controlled through a first current controller whereas currents on the side of VVVF power supply and commercial power supply are controlled through first and second current controllers, respectively. CONSTITUTION:A first current controller 12 performs vector control of a first inverter 1 based on preset motor parameters and feeds a current synchronized with the output frequency of a VVVF unit to the first inverter 1 according to a positive or negative load quantity command. A second current controller subtracts a slip frequency, calculated according to the load quantity, from the output frequency of the VVVF unit to produce a motor speed signal while furthermore the second controller feeds DC power through a second inverter 22 to a commercial power supply thus controlling the first and second inverters 12, 22. Consequently, the electronic load unit according to the invention can deal with a plurality of motors having different characteristics. |
