Topic 4_IM_speed_control_slides123-168

# Topic 4_IM_speed_control_slides123-168 - 2011 Edition...

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Topic 4 Induction Motor Speed Control ELE847 Advanced Electromechanical Systems 2011 Edition Bin Wu Professor Dept of Electrical & Computer Engineering Office: ENG328 Tel: (416) 979 5000 ext: 6484 Email: [email protected] Advanced Electromechanical Systems ELE847 2011 2 Topic 4 Induction Motor Speed Control Slides 123 168

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Advanced Electromechanical Systems ELE847 2011 123 r ω abc i abc v Main control schemes V/F control (volts per hertz control) simple Field oriented control (FOC) – advanced Direct torque control (DTC) – advanced Induction Motor (IM) Speed Control IM Drive Controller : Microprocessors/DSP/FPGA Advanced Electromechanical Systems ELE847 2011 124 Induction Motor (IM) Speed Control Field Oriented Control (FOC) – Introduction FOC also known as Vector Control . Main feature of FOC Excellent dynamic performance. Methodology Emulate a dc motor control Decoupled control of magnetic flux and torque components. Applications Paper mills, rolling mills, electrical vehicles, and elevators, etc., where the dynamic performance of the IM is very important.
Advanced Electromechanical Systems ELE847 2011 125 FOC Introduction Recall torque production in a dc motor The torque T e is proportional to the product of flux λ f and armature current i a . The flux λ f is controlled by i f and is kept at its rated value in most applications. The torque is controlled directly by armature current i a if λ f = const. Induction Motor (IM) Speed Control e af f a a f a T L i i K i λ = = × × Current Torque Flux The flux and torque are controlled independently through i f and i a , respectively. f v f i = a e a v a i f r a r r ω ff L aa L f r af i L ω Armature circuit Field circuit Advanced Electromechanical Systems ELE847 2011 126 FOC Introduction Speed torque (motion) equation The equation is applicable to any type of motors . Q: How to accurately control the speed ω m of a dc motor? A: Control the motor electrical torque T e accurately by adjusting i a ( T e i a ) . Induction Motor (IM) Speed Control m e L d J T T dt ω = Load torque Inertia Electrical Torque Speed f v f i = a e a v a i f r a r r ω ff L aa L f r af i L ω Armature circuit Field circuit

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Advanced Electromechanical Systems ELE847 2011 127 FOC Induction motor A three phase voltage is applied to the induction motor. The stator currents are responsible for both flux and torque generation. Q: How to control flux and torque independently in induction motors? Induction Motor (IM) Speed Control a i b i c i Advanced Electromechanical Systems ELE847 2011 128 Induction Motor (IM) Speed Control FOC Induction motor A: Using the concept from dc motor, the stator currents can be resolved into two components i f and i T , where i f is the flux producing component; i T is the torque producing component.
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• Fall '14
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• Trigraph, induction motor, Advanced Electromechanical Systems

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