CONTROLLER FOR INDUCTION MOTOR

摘要

PURPOSE:To reduce the cost of a drive system and to obtain a high position accuracy by controlling to reciprocate a driven member until coinciding with each other when a pointer does not coincide with the data stored in a distance counter. CONSTITUTION:An electronic controller 20 calculates the overrun distance of a movable element on the basis of the data from a pointer 23 and a distance counter 22. The controller 20 calculates the phase angle control data for supplying a half-wave voltage to a main coil and an auxiliary coil 3, outputs a drive signal in response to the phase angle control data to a driver 26, and controls to reciprocate the element. When the element reciprocates, the controller 20 decrements the pointer 23, and interrupts the supply of an AC power source AC to a motor 1 when the counted value of the pointer 23 coincides with the set distance data stored in the counter 22 and stops it at the target position.