| 摘要 |
PURPOSE:To reduce torque ripple at the low speed time by controlling a vector when an excitation is weak, and weakening controlling it when the excitation is strong, outputting a torque in response to the speed. CONSTITUTION:When an error pulse number EPR is the set value ERP1 or larger, a processor 112 generates the primary current amplitude 11W based on the weakening field control, and generates the primary current amplitude 11W based on the vector control when the number ERP is the set value ERP1 or lower. The amplitude 11W is inputted to the first and second multipliers 126, 127, and the calculated result is inputted to a multiplexer 128. The multiplexer 128 inputs the output of the multiplier 126 when the rotating speed is 300rpm or higher, and the output of the multiplier 127 when 300rpm or lower, to multiplication D/A converters 113, 114. |
