Electro-dynamic planar motor

The control behaviour of an electro-dynamic motor, also known as a moving coil motor, is superior to other motor types. This is also true for the linear version of this motor type. The classic solution to produce an x–y movement with a long-stroke is to apply a stack of at least two linear motors. A rising moving mass, combined with a limited mechanical stiffness, limits the bandwidth. An alternative is the planar motor, which generates x- and y-movements. This paper describes an electro-dynamic planar motor with moving coils, which levitates and propels itself over long x- and y-strokes under full control over six degrees of freedom (6-DOF).