Research of high performance and low cost inverter

An off-line parameter identification of induction motor based on RLS algorithm was presented in the dissertation. Figuring out the Bart wirth digital filter state equation through improved euler numerical solution, the filtering value of signal was got, and the first-order derivative and the second-order derivative also were got directly. It avoids the error influence of derivative discretization and improves the computation accuracy. Estimate rotor flux angle and speed with the back electromotive force adjustment method, and design speed sensorless vector control system. The experiment indicates that this system has the advantages of wide speed range, large torque at low speed, good dynamic and static properties, quick frequency response and small velocity fluctuation. For the home appliances Inverter, the paper designs a low-cost hardware control panel with compact structure and strong performance. It samples current by resistor, which effectively reduces hardware costs. It shows good operate performance in the inverter experiment of washing machine.