Abstract : This paper briefly introduces the structure of the MF type voice coil linear motor and designs a controller for the minimum-step ripple-free control method for special input applications, achieving good results. Keywords : Linear motor; Minimum-step; Ripple-free 1 Introduction Voice coil linear motors are increasingly widely used in direct motion applications on machine tools due to their advantages such as light weight, high frequency response, high speed, large stroke, and large thrust. Based on different structural forms, the application models of this type of motor can be divided into two main categories: one is the mass-spring damping model, i.e., the MFK type; the other is the mass-damped model, i.e., the MF model. For the MFK type, engineering applications are mature. Due to the effect of the spring K, the system control is easy to implement. However, the spring factor also has a negative impact, as it limits the output displacement. Furthermore, to overcome the spring's constraint, the linear motor has to use most of its output force to generate spring deformation. Therefore, the MF type linear motor, which removes the spring, naturally has its inherent advantages. The American CROSS company is a major representative of this type of motor. [b]2 Design of Ripple-Free Minimum-Phase Error-Free Control System 2.1 Design Theory of Invalid Wave Minimum-Phase Error-Free Control System[/b] First, a brief introduction to the design method of ripple-free minimum-phase error-free control system is given. For detailed derivations, please refer to the references. Minimum-phase error-free design belongs to the discrete design method. Its advantages are that it is relatively intuitive, easy to analyze, and easy to implement on a computer. It requires that the input and output be consistent within a minimum number of sampling periods. Such a system requires the closed-loop pulse transfer function to be fast and accurate. [b][align=center]For more details, please click: Minimum-Phase Ripple-Free Control of MF Type Voice Coil Linear Motor[/align][/b]