Designing A Sensorless Torque Estimator For Direct Torque Control Of An Induction Motor
I. INTRODUCTION
A. BACKGROUND
B. OBJECTIVE
C. INDUCTION MOTOR OVERVIEW
D. APPROACH
II. OBSERVER OF THE ELECTROMAGNETIC TORQUE
A. DERIVATION OF TORQUE EQUATION
1. Flux Linkage and Voltage Equations in the Arbitrary (qd0) Reference Frame
2. Electromagnetic Torque Equation
B. TORQUE ESTIMATOR IN SIMULINK/MATLAB ENVIROMENT
1. Designing the Torque Estimator
2. Computer Simulation — Analysis of the Results
a. Applying a High Pass Filter after the Integration
b. Placing a Low Pass Filter in the Output of the Torque Estimator
c. Comparing the Two Proposed Solutions
III. COMPUTING THE TORQUE OF A REAL MOTOR