FPGA implementation of high gain observer for induction machine using Simulink HDL coder

This paper focus on the implementation in Field Programmable Gate Arrays (FPGA) of high gain observer (HGO) applied to induction machine. We use the evaluated board Spartant3E with Xc3s500 FPGA for this purpose. The three phases supply and its corresponding pulse width modulation (PWM) are softly generated. Then, with only the both stator currents measurements, an estimation of rotor flux, mechanical speed achieved. Due to the limitation resources of Xc3s500, we have choice a reduced size format of the internals variables as well as the software algorithm can give an acceptable signals with moderate ripples. We have highlight different ways to obtain the implementation of complex functions inherent of the HGO. With the flexibility of our method, other algorithm related to observation or advanced control law can easily embedded into the FPGA.