| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that it is necessary to estimate initial speed of an electric motor and initial secondary magnetic flux by pickup control means and an initial value estimator when torque control is started when torque control of the electric machine during inertial rotation is performed in speed sensorless and that there is possibility of occurrence of an error in initial speed and an initial secondary magnetic flux estimation value especially when residual magnetic flux exists or at the time of high speed rotation in a case where an initial value is estimated in the initial value estimator.SOLUTION: A speed sensorless electric motor controller includes: a pickup control section with switching 102, which can control a current vector to DC current of a plurality of phase angles in response to a DC current command and a DC phase angle command, switches a plurality of control results with a pickup control switch command and outputs a pickup voltage command; and a pickup resetting section 101 for inputting an actual magnetic flux vector and a DC phase angle command and outputting the pickup control switch command. |
