Lecture Notes # 11 - ELE847 WEEK 11 4.7 Field Orientated...

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ELE847 – WEEK 11 4.7 Field Orientated Control (FOC) (aka vector control) 1. Introduction Main feature of FOC - Excellent dynamic performance Applications - Paper mills, electric vehicles, rolling mills, elevators etc. Where the dynamic performance of the IM is very important. Comparison between DC motor and IM (1) DC motor f V a i a V a E n a R f i = a a e i K T φ φ - air gap flux, kept at its rates value in most applications. a e i T Speed – torque equation (for any type of motors) L e m T T dt d J = ω Q: How to accurately control the motor speed m ω ? A: Control the motor torque e T accurately. For dc motors, m a e i T ω can be controlled by a i .
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(2) Induction Motor For induction motors, both flux and torque are produced by the stator currents a i b i c i a i b i c i Q: How to control the flux and torque independently A: In theory the stator currents can be resolved into two components f i and T i where: f i - flux producing component T i - torque producing component If f i can be kept constant and T i can be independently controlled, high dynamic performance can be achieved. Q: How to find m ω and m ω A: Use FOC vector control theory 2. Principle of FOC Vector Diagram. T θ m ω syn ω ds i syn ω r λ sl θ f θ r θ s θ s ds f i i = qs i s qs T i i = s i r λ - rotor flux rotating in space at the synchronous speed T i ( the synch. frame) f θ - rotor flux angle s i - stator current (in the synch. frame)
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s θ - stator current angle r θ - rotor angle (rotor position) sl θ - slip angle sl r f θ θ θ + =
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