By Jingde Gao
"AC computer structures" stresses either research tools and working performances of AC laptop structures, together with variable velocity force process of AC machines with strength electronics and keep watch over units, strength strength method composed of AC machines and tool traces, specific computing device procedure with distinctive machines and exact lots, electrical desktop approach inclusive of AC machines and excitation units. in line with a unmarried coil, the Multi-Loop concept is punctiliously defined, and examples of the way to exploit the recent technique are provided. This publication presents a brand new means for reading the AC computing device structures. This e-book is designed for the researchers and postgraduates within the box of electrical machines and keep an eye on. it is also a reference e-book for similar technicians. This booklet is written in reminiscence of Professor Jingde Gao, past-president of Tsinghua college, Member of chinese language Academy of Sciences. one other authors, Linzheng Zhang and Xiangheng Wang either are Professors in electric Engineering Dept. of Tsinghua college.
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Extra resources for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
10 Analysis of Parameters and Performance of SinglePhase Induction Motors In the above sections, the basic electromagnetic relations of the salient pole synchronous machine are analyzed mainly, that is, related physical concept, basic voltage equations and flux-linkage equations, calculation method of each loop parameter of electric machine, electro-magnetic torque and rotor motion equation, etc. are analyzed. After getting these relations, various operation performances of the ac machine can be analyzed and calculated.
25 ¸ ¨ ln 2 ʌ © re ¹ where t2 is length of each segment of the end ring; le is the interval between the end ring and rotor end surface; re is the equivalent radius of the cross-section of the end ring. 2 Inductances Produced by Stator Leakage Magnetic Field In analyzing the inductance of each stator loop produced by the air-gap magnetic field, the harmonic magnetic field is considered already, so the effect of stator differential leakage reactance is included in this inductance. The inductances produced by slot leakage and end part leakage are discussed below: (1) Inductance produced by slot leakage flux With regard to inductance produced by slot leakage flux, detailed discussion and well known calculation method already exist.
10) In the above formula, | k j | and | k j | are obtained in such a way: In formula (1-5-8), when j k r 2l , j k r2l , so there is 2l | k j | ; when j k 2l (since k and 2l are positive, j cannot equal k 2l ), then 2l | k j | . 10). e. the above formula is the expression of j - th harmonic flux density produced by d-axis k - th harmonic mmf when the axis of the damping loop11c and the rotor d-axis overlap each other. 28 1 Circuit Analysis of AC Machines — Multi-Loop Model and Parameters After getting the expression of the air-gap flux density, the flux-linkage of each loop is obtained, and the inductance of each loop will be gained.