Treffer: IMPLEMENTATION OF THE SPACE-VECTOR PULSE-WIDTH MODULATION BLOCK AS A PART OF INDUCTION MOTOR CONTROLLER BASED ON FPGA

Urgency of the research. The improvement of electric vehicles and public electric transport is dealing with the merging to electric drives of a direct-torque frequency-controlled drive based on an induction motor with a squirrel-cage rotor and a vector control system. Target setting. The quality of control is mainly limited by the speed of the digital control system, which must perform a huge number of complex vector-based calculations. Actual scientific researches and issues analysis. In applied solutions based on DSP or DSC with built-in hardware modules, the maximum PWM carrier frequency is limited by the core sequential architecture. In FPGA-based solutions, the coordinate transformation functions are realized on the basis of logic and arithmetic configurable blocks, whose, as a result of synthesis, occupies an excessive amount of IC resources. Uninvestigated parts of general matters defining. A more faster and efficient solution is to determine trigonometric functions using a lookup table based method with base vector switching using a separate finite state machine. The research objective. The aim of research is to develop of algorithms for constructing a block of SVPWM as part of an induction motor controller based on FPGA and implementing its components using VHDL (hardware description language). The statement of basic materials. The structure and operation algorithm of the block that consists of the vector modulation sector observer unit, the finite-state machine of state-vector modulation unit, the reverse counter unit, the sine function lookup table unit, the two-channel PW-modulator unit, and the modulation signal distribution unit. All units are described using VHDL and are composed into a global entity. The timing diagrams of the output signals of the SVM are modulated by the PWM signal, which duty cycle is changes according to a sinusoidal law. Conclusions. A new algorithm for constructing a flexible block of space-vector pulse-width modulation as a pa