Sensorless control of induction motor using an 8bit microcontroller with low cost current measurement

摘要

This paper presents a sensorless field-oriented control of an induction machine using an 8bit microcontroller. The current measurements take place in the low-side switches of the converter through a shunt. There is no potential separation between the power unit, the measurements and the controller. The real stator currents are determined in dependency of the space vector modulation pulse pattern and the measurements. The rotor flux determination is realised with a flux model containing a rotation speed dependent feedback. This is done to get the rotor flux angle and the rotor speed. The experimental results of the implementation show that you can reach a good and a dynamic performance for low cost application.