Integral motor with driver and wireless transmission of power and information for autonomous subspindle drive

This paper describes the novel technology of an integral motor with the ass ociated driver and wireless transmission of power and information (WTPI), w hich is effectively applied to autonomous spindle drive for the sophisticat ed workpiece machining. The power supply to the integral motor is made by w ay of a separable WTPI coupling. In addition, calculation for variable volt age and variable frequency (VVVF) control is done at the primary side of th e coupling, and then the frequency command is transmitted to the secondary side by an overlapped transmission of the data on the power transmission th rough the WTPI coupling. At the secondary side, direct power conversion fro m the induced high-frequency voltage to the motor terminal voltage is condu cted using the bidirectionally controllable power switch. The amplitude of the terminal voltage is adjusted by changing the inverter voltage at the pr imary side, In this way the VVVF drive is made through the WTPI coupling, t hus providing the integral subspindle with the autonomy for sophisticated m achining.