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.
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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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