FPGA-realization of a sensorless speed control IC for IPMSM drive

Based on FPGA (Field Programmable Gate Array) technology, the realization of a sensorless control IC for IPMSM (Interior Permanent Magnet Synchronous Motor) drive is presented in this paper. Firstly, a mathematical model for IPMSM is derived and an extended EMF (Electro-Motive Force) or EEMF is defined. Secondly, a rotor position is estimated by using a sliding mode observer (SMO). These estimated values are feed-backed to the current loop for vector control and to the speed loop for speed control. Thirdly, an FSM (Finite State Machine) method is adopted to describe the overall SMO-based rotor position estimator. Further, using novel FPGA technology, the realization of a sensorless speed control IC is also described. At last, an experimental system is established to verify the effectiveness of the proposed sensorless speed control IC, and some experimental results are confirmed theoretically.