A new mechanism for boring of noncircular hole and its evaluation via simulation

A revolving magnetic mechanism composed of a stator and rotor has been designed to supply contactless actuation force to boring bar for boring of non-circular hole. While the currents in the pole-pairs coils on the stator change, the actuation force would change correspondingly and drive the rotor to take a wanted micro displacement radially. With the linearization of the actuation force, linear relationship between the control current and the actuation force has been established. With the simulations of the magnetic field parameters, the relationship between the actuation current (bias current plus control current) and magnetic force has been present visually. The static simulations show that the magnetic force between the stator and rotor is little while there are only bias currents applied in the pole-pairs coils. The influences of bias currents to actuation forces have been simulated and calculated theoretically, and nonlinear phenomena emerged have been analyzed. The design principles for bias current in magnetic actuation mechanism have been put forward.