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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 N2/(Wm3) and 2.6×106N2/(Wm3) respectively, where these values are over twice as large as those of conventional linear motors.