An examination for increasing the motor constant of a cylindrical moving magnet-type linear actuator

This paper describes the motor constant of a cylindrical moving magnet-type linear actuator for obtaining high response characteristics. The theoretical expression of motor constant square density G is deduced using the permeance method. A prototype linear actuator is designed in both permeance method and the finite element method. Measured motor constant and motor constant square density of the prototype linear actuator are 17.1 N/sup 2//(Wm/sup 3/) and 2.6/spl times/10/sup 6/N/sup 2//(Wm/sup 3/) respectively, where these values are over twice as large as those of conventional linear motors.