Research On Speed Sensorless Technology For Bearingless Induction Motor

The bearingless motor is a new type of motor which hybridizes the motors and the magnetic bearings. It has been the focus of research work on high speed motors. And the bearingless induction motor is one of the earliest motors on which are researched, because of its easy field weaken, simple structure, high reliability.When the bearingless induction motor works in high or super high speed, obtain of the rotor speed information becomes difficult. Then the speed sensorless technology can be applied to get the speed information. Until now, a lot of work has been done on the technology. And this dissertation focuses on the speed sensorless technology.This paper first expounds the principle of the bearingless induction motor, gives the mathematical model of bearingless induction motor and analyzes the rotor flux orientation vector control system of the bearingless induction motor. Based on the above points, this dissertation mainly studies on the dynamic speed estimation and model reference adaptive system. The mathematical models of them are gave to study on the principle of speed estimation. Then the principle is validated by the computer simulation in different speeds. This paper improves on these methods to solve the problems during the simulation. After the computer simulation, the application of the speed sensorless technology in the vector control of the bearingless induction motor is coming true.At last, this paper studies on the digital control hardware and software system on the TMS320F2812 DSP.