Design and analysis of a novel rotary-linear motor with voice coil structure

With the greatly development of the industry, such as the field of integrated circuit and high-precision robot arm, they always require multidimensional complex movements and posture adjustments. Therefore, the multi-degree-of-freedom motion platform is among the most important research topics to advance precision machining. As one of them, the rotary-linear motors have the advantages of two degree-of-freedom motions and simple structures, which can facilitate high performance [1], [2]. However, the conventional rotary-linear motor has the disadvantages of low acceleration, big size, no-smooth force, slow actuation and so on. Therefore, a novel type of rotary linear motor overcoming these disadvantages with high controllability is an increasing necessity. In this paper, a rotary-linear motor combined the SPM motor and the voice coil motor [3] structure (RL-SVCM) is proposed here to achieve rotary and linear motion independently and fully decoupling control with smooth linear force. Furthermore, the voice coil structure of the mover allows the motor to provide a high acceleration and quick response. Especially, the novel unique structure in the linear motion part can make the linear force approaching constant value, which proves a big convenience for the control of the voice coil motor. This motor features a small size, which makes the motor especially suitable for PCB drilling, pick-and place systems, tooling machine, precision operated robot arm and so on.