By Jingde Gao
"AC desktop structures" stresses either research tools and working performances of AC laptop structures, together with variable velocity force procedure of AC machines with strength electronics and regulate units, energy strength procedure composed of AC machines and gear strains, unique computing device process with designated machines and particular a lot, electrical computing device approach which include AC machines and excitation units. according to a unmarried coil, the Multi-Loop conception is carefully defined, and examples of the way to take advantage of the hot technique are provided. This ebook presents a brand new method for reading the AC laptop platforms. This booklet 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 publication 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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Additional resources for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
When other connection is adopted for excitation winding or when internal fault occurs in it, its inductance can be obtained by a similar method, the details are not repeated here. 1) where L fdl is the inductance corresponding to end region leakage flux, leakage flux between rotor poles and leakage flux of pole surface; L f d G is the inductance corresponding to air-gap flux density. The mmf produced by the current of excitation winding is rectangular wave, the excitation mmf F ( x) and the corresponding air-gap flux density B ( x) are drawn in Fig.
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.
Actual currents in the damping bars are algebraic sum of the corresponding direct and quadrature axis loop currents. When only the space fundamental of the air-gap magnetic field is considered, obvious merits exist for such selected damping loops as follows: since the space angle difference S electric radians, and in between direct and quadrature axis current loops is 2 24 1 Circuit Analysis of AC Machines — Multi-Loop Model and Parameters structure the rotor is symmetric to direct axis and quadrature axis, mutual inductance and mutual resistance do not exist between the direct and quadrature axis current loops, then the actual damping winding can be considered as two imaginary damping winding groups shown in Fig.