AC Motor Control and Electrical Vehicle Applications by Kwang Hee Nam

By Kwang Hee Nam

Motor keep watch over expertise keeps to play a necessary function within the initiative to put off or at the very least lessen petroleum dependency and greenhouse fuel emissions worldwide. elevated motor potency is a vital point of this technological know-how within the international transition to wash strength use in parts comparable to commercial purposes and residential appliances―but really within the layout of vehicles.

Summarizes the evolution of motor riding devices towards excessive potency, cost-effective, excessive energy density, and versatile interface with different components

AC Motor keep an eye on and electrical motor vehicle Applications addresses the subjects pointed out in its identify but additionally elaborates on motor layout viewpoint, resembling again EMF harmonics, loss, flux saturation, and reluctance torque, and so forth. keeping theoretical integrity in AC motor modeling and keep watch over all through, the writer specializes in the advantages and ease of the rotor field-oriented regulate, describing the fundamentals of PWM, inverter, and sensors. He additionally clarifies the basics of electrical autos and their linked dynamics, motor concerns, and battery limits. a robust compendium of useful details, this e-book serves as an total useful gizmo for the layout and regulate of high-efficiency motors.

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Preliminaries for Motor Control ( gain is approximated as 1 Js ( Kp Kp + Ti s Kp 1+τσ s )( ) 15 1 Js . 1 1 + τσ s Summarizing the above, we have ) ≈     Kp Ti J s2 Kp ( J s)   1  Kp 1+τσ s Js (−40dB), [0, ω1 ) (−20dB), [ω1 , ω2 ) (−40dB), [ω2 , ∞) Let [0, ωsc ) be the speed bandwidth. Then, it is necessary to make ω < ωsc . Hence, the proportional gain should be selected as Kp Jω Kp = Jωsc . 13) It is necessary to make the corner frequency ω1 of the PI controller much less than ωsc : A common rule to choose the integral time constant is 1 ωsc = .

32) =R(θ) where R(θ) is a matrix which represents rotation of the coordinate frame by θ. That is, map T(θ) consists of two parts: One is a map from the (a, b, c)-frame into the stationary dq-frame. The other is a map from the stationary frame into the rotating dq-frame. The inverse map is calculated as   √1 cos θ − sin θ 2     cos(θ − 2π ) − sin(θ − 2π ) √1  −1 T (θ) =  . 33) 3 3 2     2π 2π 1 √ cos(θ + 3 ) − sin(θ + 3 ) 2 Hence,  1    1 −1 T (0) =  − 2   − 12 0 √ 3 2 − √ 3 2 √1 2     √1  .

Preliminaries for Motor Control 17 Fig. 17 (b). The location of the integral part is the same as that of the PI controller. 16) K K K K ∗ t p ω (s) s+ t p s2 + IP Controller ⇒ ωrIP (s) = ω ∗ (s) s2 + J JTi Kp Kt JTi Kt Kp Kt Kp J s + JTi . 17) Note that both functions have the same denominator, but the numerators are different: An IP controller does not have differential operator ‘s’, whereas a PI controller does. Let ωrP I (t) = L−1 {ωrP I (s)} and ωrIP (t) = L−1 {ωrIP (s)}, where L−1 is the inverse Laplace operator.

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