Advanced Modeling of Electro Motor load By Kabenla Armah Supervisor: Jerome Jouffroy Co-supervisor: Søren Top

Content  Introduction  Modeling method  Results  Conclusion

Introduction  Main objective  Current Approach To develop advanced models of electro motor capable of emulating an arbitrary electro motor and under load conditions. To develop advanced models of electro motor capable of emulating an arbitrary electro motor and under load conditions. Using actual motors attached to a load for testing

Introduction Electric load Electric motor models Emulator

Introduction  Three-phase induction motor:  Operation Most popular AC motor for applications in industrial environment Its operation is based on Faraday’s law of Induction, lenz law and lorentz force

Introduction Three- phase induction motor [ 8] Wikipedia, rotor

Introduction  A recap of existing literature tells us [1]-[9]  8 equations needed  Reduced number of equations using(DQO transformation matrix)  Balanced system  Problem  Unbalanced systems

Modeling Method

 Approach  Development of these equations using variation in energy  Assumptions made: neglect hysterisis and core-loss, uniform airgap length Input power Output power losses loadload Electromagnetic power

Modeling Method Stator side equation:

Modeling Method

0

 Torque equation Number of poles

Modeling Method  Speed Equation Load torque Coefficient of friction Mechanical speed Load torque

Results

Results  Simulation scenario  Direct-online start(directly connected to supply)  Squirrel-cage induction motor( Vr=0)  A load attached to the motor

Results  Case 1  Balanced system

Results  Three-phase Stator currents

Results  Torque Graph

Results  Speed Graph

Results  Case 2  Voltage imbalance (single phase)

Results  Torque

Results  Three-phase Current graph

Results  Case 2  Inter-turn short-circuit (Stator Phase A )

Results  Torque Graph

Results  Three-phase current graph

Conclusion  This model  Demonstrate the behaviour of the induction motor under balanced conditions  More flexibility in varying parameters to demonstrate system imbalance

Thank you

References  [1] Dal Y. Ohm, ”Dynamic Model of Induction Motors For Vector Control”, Drivetech, Inc., Blacksburg, Virginia.  [2] P.C.Sen,”Principles of Electric Machines and Power Electronics, 2nd Edition”: Wiley,  [3] Erickson, Robert W., Maksimovic, Dragan,”Fundamentals of Power Electronics,2nd Edition”: Springer  [4] A. M. Trzynadlowski, The Field Orientation Principle in Control of Induction Motors :Kluwer Academic Publishers,  [5] Benot Robyns, Bruno Francois, Philippe Degobert and Jean Paul Hautier,”Vector Control of Induction Machines, Desensitisation and  Optimisation Through Fuzzy Logic”:Springer,  [6] R. J. Lee, P. Pillay and R. G. Harley,” D,Q Reference Frames for the Simulation of Induction Motors”, Electric Power Systems Research,  8 pp , 1984/85.  [7] Chee-Mun Ong,”Dynamic Simulation of Electric Machinery, Using Matlab/Simulink”:Prentice Hall,  [8] Wikipedia,” rotor”  [9] Nidec Corporation,”  [10] TMEIC, ” Energy%20Savings%20Wound%20Rotor%20Induction%20Motor%20Savings-  374”  [11] Hsin-Jang Shieh and Kuo-Kai Shyu, ”Nonlinear Sliding-Mode Torque Control with Adaptive Backstepping Approach for Induction  Motor Drive”,IEEE Transactions on Industrial electronics: VOL.46, NO.2, APRIL 1999.

Electric_energy= winding_losses + electromagnetic_energy Modeling Method Subscript: s-stator, r-rotor

Modeling Method  Rotor three-phase Equation: