| 摘要 |
PURPOSE:To obtain the readhering characteristics of an electric motor vehicle by obtaining the softly down characteristic value of time differentiation from the average value of deviation values with the maximum effective current signal as a reference. CONSTITUTION:A current detector 7 obtains the average value of the effective currents of a plurality of motors from an effective current detecctor 1c, and outputs a current feedback signal iB1. A deviation value detector 8 obtains the deviation values of the resective input values with the maximum effective current input as a reference, thereby obtaining the average value of the deviation values and outputs a current deviation value signal DELTAi1. A softly down circuit 10 applies a current soft-down signal iSD alleviated from the reducing characteristics at the time of varying a signal is differentiated from the signal DELTAi1 in a reducing direction to an insensing band generator 11. A comparison arithmetic unit 5 applies the deviation signal between the signal added by the current feed back signals iB1, iB2 and the effective current command iA from a current instruction unit 6 to a VVVF inverter 2. |
