advertisement

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 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 [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: