Structure and characteristics of closed-loop two-dimensional surface motors - a literature survey

At present, Sawyer planar motor is the only form of two-dimensional motor available to industry. Often operating in an open-loop stepping manner, it has the disadvantages such as susceptibility of loss of steps and external disturbances. This paper investigates a new generation of closed loop 2D surface motors, including permanent magnetic planar motor, planar induction motor and planar variable reluctance motor. Also the corresponding performance, structure, and characteristics are summarized and compared.