By Jingde Gao
"AC computer platforms" stresses either research tools and working performances of AC laptop structures, together with variable pace force method of AC machines with strength electronics and keep an eye on units, energy strength approach composed of AC machines and gear traces, specified computer approach with certain machines and unique rather a lot, electrical computer procedure which includes AC machines and excitation units. in response to a unmarried coil, the Multi-Loop concept is punctiliously defined, and examples of ways to take advantage of the recent process are offered. This publication offers a brand new means for examining the AC computer 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 publication for similar technicians. This booklet is written in reminiscence of Professor Jingde Gao, past-president of Tsinghua collage, 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 info for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
It is not discussed further here. 7 Influence of Saturation on Parameters In discussing the inductances related to air-gap magnetic field in the above sections, the concept of air-gap permeance and harmonic analysis method are adopted, and it is supposed that mmfs are all spent in air-gap; as for iron reluctance, it is considered by enlarging air-gap length suitably. In the unsaturation state of electric machine, the iron section works in the linear part of the B-H curve, and the relation of excitation current and the no-load voltage of electric machine is also at linear part.
18) From Fig. 5), it is known that the calculation formulas of air-gap permeance coefficient O2l of salient pole synchronous machine and the permeance coefficient Odk corresponding to harmonics flux density produced by rectangular wave excitation mmf are similar in form. Their only difference is that 2l in formula of O2l is even, and k in formula of Odk is odd. 24) will be obtained. 24) reflect this feature. This is in accord with the rule, because stator iron is round. e. they are time-variant coefficients.
Concrete method is as follows. When calculating the end region magnetic field produced by single coil current, the coil end part is divided into several current elements, and the magnetic field produced by the current elements is calculated in terms of Biot-Savart law. The magnetic field on each point of end region is the superposition of the magnetic field produced by all current elements. After getting the magnetic field, the flux-linkage of the end part of each coil can be calculated, and then the inductance produced by end region leakage flux will be obtained.