By Jingde Gao
"AC computer platforms" stresses either research tools and working performances of AC computing device structures, together with variable velocity force method of AC machines with energy electronics and regulate units, energy strength process composed of AC machines and gear strains, precise desktop method with distinct machines and certain lots, electrical computing device process inclusive of AC machines and excitation units. in accordance with a unmarried coil, the Multi-Loop thought is carefully defined, and examples of ways to take advantage of the recent procedure are offered. This ebook presents a brand new method for reading the AC computing device platforms. This e-book is designed for the researchers and postgraduates within the box of electrical machines and keep watch over. 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 collage.
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Additional info for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
The effect of the harmonics of air-gap magnetic field on the inductances of stator branches is also very strong, especially for fractional harmonics and low order harmonics. 293 u 102 H . It is obvious that the effect of harmonics on the inductances of stator branches is very strong. e. they are time-variant parameters. e. the above inductances are constants independent of rotor position. Finally, it should be stated that in most instances the phase winding can be considered as a researched unit.
If the single coil inductance is calculated firstly, in spite of coil connection mode it is very convenient to calculate the inductances of windings, branches, or certain several coils connected, if needed, in terms of the obtained single coil inductances. The reason why the above method is adopted is to illustrate its concrete usage. The rotor circuit of the single phase induction machine is shown in Fig. 1(b). 17) of the rotor damper loop inductances of the salient pole synchronous machine can be cited.
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. 1. Suppose that the turn number of excitation winding on each pole is w fd , the parallel branch number of excitation winding is a fd , total excitation current is i fd , then the branch current of excitation winding will be i fd a fd . 1 Excitation mmf and its air-gap flux density 23 AC Machine Systems rectangular wave with a width of S radians approximately.