Analytical development of a minimum bearing reaction twin-motor for duplex machining

A distributed electromagnetic twin-motor for duplex machining of disk-like workpieces is presented. Featured with independent current inputs in the EMs, this motor can ensure minimum bearing reaction during cutting process by simultaneously compensating for the external loadings with the electromagnetic forces while spinning the rotor. With closed-form representations of the current-force model, the desired current inputs can be computed from the force vector determined by the control method for minimum bearing reaction. Simulation is performed for given cutting forces as external loading and the results show that the control method of the twin-motor can adjust the actuating force and torque to cancel the imbalance loading conditions.