Speed Control of Motor for City Railway System by Using Rotor Position and Speed Detector

Abstract

Abstract. As a speed control device for motor control, optical encoders are frequently employed, while resolvers are used when mounting of the encoder onto a motor is structurally difficult. Although the resolvers are disadvantageous in the price aspect compared with the encoders, they are useful in the case of control based on the positions of stimulus as absolute positions of the rotor are detected. In the present article, the minimum hardware of filter was used as a method to detect rotary speed of the motor according to the resolver, and a speed detector by digital method according to a program has been presented.