Auto Tuning of Sensor less Vector Controlled Induction Motor Drive

Abstract

Sensorless vector control of an induction motor drive means vector control without any speed sensor. An incremental shaft mounted speed encoder is required for close loop speed or position control in both vector and scalar controlled drive. A speed signal is required in vector control. It is possible to estimate the speed signal from machine parameter like terminal voltage and current with the help of ARM microcontroller. The estimation is normally complex and heavily dependent on machine parameter. In recent days the sensorless vector control fed machine's parameter has a major impact on performance of all system like, the dynamic speed response performances for continuously changing load torque disturbances etc.

Proposed project aims to self commissioning of induction motor parameters like stator and rotor resistance, stator and rotor leakage inductance, magnetizing inductance etc. at the start of the motor when input instructions are given. Once the command signals are given it operates inverter with automatic tuning of machine parameters. This method is based on the frequency domain test performed at standstill avoiding then the locked rotor and no-load test. The proposed algorithm can be implemented on sensorless vector controlled induction motor drive in order to automatically perform self commissioning.