Position control for a linear slider with twin linear drives

Abstract

SUMMARYIn this paper, position control of a linear slider with twin linear drives is considered. Recently, for high-speed response, several linear motors have been used for linear slider systems.In such a linear slider, if the linear drives are controlled individually, their position responses may undergo vibrational disturbance by interaction with the output of the motors. To control this vibration, this paper presents a dynamic model of a linear slider system which consists of two motion systems decoupled by coordinate transformation, and proposes a feedback controller which is designed for these two decoupled systems. The effectiveness of the proposed method is confirmed by experiments.

Model Decoupled Synchronization Control Design with Fractional Order Filter for H-Type Air Floating Motion Platform

“…The Lagrangian dynamic model of the H-type motion platform is established, which converts the position of the double motors into the position and angle around the middle point of the beam for control [ 14 ]. In these control methods, the position coupling between the dual motors connected by the beam of the H-type motion platform is not considered, the controller is difficult to design, and the system stability cannot be guaranteed [ 15 ]. To solve this problem, a control method based on coordinate decoupling is proposed.…”

“…The two degrees of freedom of position and rotation are naturally decoupled, which is conducive to designing the controller. This decoupling method is used to control the position of the dual motor driven linear slider, but no moving part is on the beam [ 15 ]. The feed-forward control is introduced to improve the position tracking accuracy based on the decoupled model [ 16 ], but the research on introducing feed-forward control into the rotation control loop to improve the synchronization accuracy is scarce.…”

Control Model for Large‐Sized Gantry Type Linear Motor Slider

“…As a direct drive device, linear motor sliders do not need components inherent in ball screw sliders-screw ball, coupling, and speed reducer; hence, no influence of elastic joint in control [1]. These devices are mostly linear motor sliders and ball screw sliders.…”

“…When aiming at higher power of a single linear motor, one has to design and manufacture a large-sized motor; in so doing, special design and individual manufacture are required because of permanent magnets for the field system and other issues, which inevitably adds to cost. For example, there are methods using response error between axes [6] and response error combined with low-pass filter [7] or with disturbance observer [8] as well as methods focused on dynamics of linear motor slider treated as a rigid body [1]. Gantry type linear motor sliders are an example.…”