A method for controlling an electric actuator may involve determining with a controller a manipulated variable T1 of an actuating motor, in order, starting from an actual position X as a state variable to reach a target position Xd. The method may further involve calculating a control value of the electric actuator based on the manipulated variable T1. The manipulated variable T1 of the actuating motor may be calculated by using a second time derivative of the target position d.sup.2Xd/dt.sup.2 and an achieved control change ΔX|.sub.τ−ΔX|.sub.0, wherein ΔX|.sub.τ=Difference target−actual position at time τ and ΔX|.sub.0=Difference target−actual position at time t=t0.

A servo control device according to the present invention performs speed control or torque control for controlling speed or torque of a servo motor based on a speed command or a torque command by an analog input voltage, and performs positional control for controlling a position of the servo motor based on feedback from the servo motor, includes a command switching unit determining that a command voltage by the analog input voltage enters a dead zone of the command voltage which is registered in advance and determined as stopping, and when detecting that the command voltage enters the dead zone, the command switching unit ceases the speed control or the torque control to perform deceleration stop by the positional control by distribution processing of a movement command regarding an actual speed when the speed control or the torque control is ceased as an initial speed.

A servo control device according to the present invention performs speed control or torque control for controlling speed or torque of a servo motor based on a speed command or a torque command by an analogue input voltage, and performs positional control for controlling a position of the servo motor based on feedback from the servo motor, includes a command switching unit determining that a command voltage by the analogue input voltage enters a dead zone of the command voltage which is registered in advance and determined as stopping, and when detecting that the command voltage enters the dead zone, the command switching unit ceases the speed control or the torque control to perform deceleration stop by the positional control by distribution processing of a movement command regarding an actual speed when the speed control or the torque control is ceased as an initial speed.