Advanced Modeling of
Electro Motor load
By
Kabenla Armah
Supervisor: Jerome Jouffroy
Co-supervisor: Søren Top
Content
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Introduction
Modeling method
Results
Conclusion
Introduction
 Main objective
To develop advanced models of electro motor capable of
emulating an arbitrary electro motor and under
load conditions.
 Current Approach
Using actual motors attached to a load for testing
Introduction
Emulator
Electric load
Electric motor
models
Introduction
 Three-phase induction motor:
Most popular AC motor for applications in industrial environment
 Operation
Its operation is based on Faraday’s law of Induction, lenz law and lorentz
force
Introduction
Three- phase induction motor
[8] Wikipedia ,http://en.wikipedia.org/wiki/Squirrel-cage 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
Modeling Method
 Approach
 Development of these equations using variation in energy
 Assumptions made: neglect hysterisis and core-loss, uniform airgap
length
losses
Input
power
Output
power
Electromagnetic
power
load
Modeling Method
Stator side equation:
Modeling Method
Modeling Method
0
Modeling Method
 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
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[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, 1996.
[3] Erickson, Robert W., Maksimovic, Dragan,”Fundamentals of Power Electronics,2nd Edition”: Springer 2001.
[4] A. M. Trzynadlowski, The Field Orientation Principle in Control of Induction Motors :Kluwer Academic Publishers, 1994.
[5] Benot Robyns, Bruno Francois, Philippe Degobert and Jean Paul Hautier,”Vector Control of Induction Machines, Desensitisation and
Optimisation Through Fuzzy Logic”:Springer, 2012.
[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. 15 -26, 1984/85.
[7] Chee-Mun Ong,”Dynamic Simulation of Electric Machinery, Using Matlab/Simulink”:Prentice Hall, 1997.
[8] Wikipedia ,”http://en.wikipedia.org/wiki/Squirrel-cage rotor”
[9] Nidec Corporation,”http://www.nidec.com/en-NA/technology/motor/basic/00026/”
[10] TMEIC, ”https://www.tmeic.com/Southeast%20Asia/732Energy%20Savings%20Wound%20Rotor%20Induction%20Motor%20Savings374”
[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.
Modeling Method
Electric_energy= winding_losses + electromagnetic_energy
Subscript: s-stator, r-rotor
Modeling Method
 Rotor three-phase Equation: