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Recently, various actuators are widely used in the industrial field. Especially, new demands for linear motors are increasing as direct driven type actuator without complex couplings. Therefore, the linear motor improves high-speed positioning and energy efficiency. As one of such linear motors, EMV (ElectroMagnetic engine Valve) has received a great deal of attention. The reason is that the EMV improves fuel efficiency greatly. We have researched and developed the mechanical structure of the linear motor and the positioning control system in order to realize the EMV.We can't realize the EMV without the linear motor which has high thrust and compactness. But such linear motor has nonlinear properties due to the detent force and torque ripple, because the linear motor is designed under the geometry control. So, it is difficult that we derive the mathematical model of the linear motor from physical relationships. Therefore, we derive the model by using identification.We use SMC (Sliding Mode servo Control) in order to reduce an adverse effect of modeling error and nonlinear properties. Moreover, we use the variable switching hyperplane (VSH) in the SMC to accomplish high speed positioning and high positioning accuracy. The proposed method is called VSMC. We design the VSH by using nonstationary optimal control method. The VSH makes the feedback gains enlarge at the beginning of positioning control to accomplish high-speed positioning. And the VSH reduces the feedback gains at the steady state to accomplish reduction of the residual vibration.To verify the effectiveness of the proposed method, we compare the performance of the proposed with conventional methods (SMC, PID control) through the some experiments using the prototype linear motor. Experimental results are shown in Fig

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