SPEED CALCULATING SYSTEM OF ROTARY ELECTRIC MACHINE

摘要

PURPOSE:To improve the transient response at the speed control time by accurately predicting the linearity of a rotor speed by a time delay to a time for reading out a rotor speed from a time for detecting the rotor speed in a microprocessor and a means speed detecting interval. CONSTITUTION:A period in response to a rotor speed of a synchronous motor 11 is detected by measuring the period of the detection signal of a resolver 12 by a speed detector 14. The field pole position of the motor 11 is detected by measuring the phase difference between the excitation signal of a resolver 15 and a detection signal by a rotating angle detector 17. A detection sampling time delay detector 23 measures a time interval between a signal generated when the detector 14 detects the rotor speed and a signal generated when a microprocessor 18 reads out the rotor speed. The microprocessor 18 outpus a 2-phase current command to a current controller 21 through D/A converters 19, 20 on the basis of the inputs.