RTLinux Based Online Real Time Simulator of SPMSM Using the Block Pulse Approximation

RTLinux based online real time simulator for speed control system of SPMSM (Surface Permanent Magnet Synchronous Motors) is proposed. For realization of the online real time simulator, a motor mathematical model based on the three phase stationary coordinate is solved using a Single Term Block Pulse Function (STBPF) and system analysis in real time. The STBPF analysis is one of the linearized model approximation so that it is more simple and it saves more calculation time compared with the other numerical analysis method, such as a Runge-Kutta algorithm. In addition, the proposed method can simulate the system more precisely by a variable width of the orthogonal input state, so it is suitable to solve an inverter model which generates the PWM pulse and the dead time effect, so on. The experimental system is based on the RTLinux and this accomplishes both the motor control and the real time simulation at the same time in 200 μs control period. Experimental results show that the online simulation results show considerable coincidence with the experimental results.