FPGA implementation of an A/D conversion and a Pulse Width Modulation with interleaving for a multiphase drive system

The scientific context in which the thesis project takes place, is that of electric machines. The work carried out is part of the realization of new configurations of asynchronous electric motors wound so as to allow the online change of the number of phases and poles generated. Such a type of motor is commonly referred to as WICSC (Wound Indipendently-Controlled Stator Coils). The main application to which we can refer for this type of engine is certainly the automotive field. The engine under study was designed to have a number of phases greater than or equal to three (commonly referred to as a multiphase machine). The work presented in this thesis is based on the implementation on FPGA of two main structure preparatory to the realization of the complete control system of an induction machine with the capability of changing number of phases and poles. The first structure implemented is related to the acquisition of the samples provided by a dedicated measurement system able to measure the current flowing in each slot of the machine. The second structure implements the Carrier Based Pulse Width Modulation. In the implementation of the modulation section the technique of interleaving is used to improve the overall performace. The implementation of the structures for sampling and sample management and for PWM modulation was carried out on FPGA using the VHDL language. The realized structures are simulated first and subsequently verified with dedicated testbench. The work is completed by simulations in Matlab-Simulink in order to have This model offers the possibility of qualitatively evaluating the benefits introduced by the interleaving modulation technique. All the work has been carried at the division of Electric Power and Energy Systems in the department of Electrical Energy Engineering at KTH Royal Institute of Technology (Stockholm).