AUTOMATIC SETTING METHOD OF SLIP-FREQUENCY COMPUTING APPARATUS

摘要

PURPOSE:To obtain a vector controller not adjusted by working the vector controller as a secondary-resistance measuring instrument for a motor constant before operation and automatically setting the constant of a slip-frequency computing element on the basis of the result of the working of the vector controller. CONSTITUTION:A secondary-resistance arithmetic section A is operated before actual operation. A signal from a signal generator 9 and a voltage signal detected by a voltage detector 14 are inputted to a vector computing element 15 and a voltage signal Vd is outputted, and the signal Vd is divided by an exciting-current command signal i*m by a divider 16 and the primary and secondary combined resistance r1+r2 of a motor are outputted. DCs are made to flow through the motor and primary resistance r1 is outputted from a divider 19. r1 Is subtracted from the signal of r1+r2 arithmetically operated as mentioned above by a subtracter 20 and secondary resistance r2 is arithmetically operated, and the secondary resistance is inputted to a slip-frequency computing element 13.