By Jingde Gao
"AC desktop structures" stresses either research equipment and working performances of AC laptop structures, together with variable velocity force approach of AC machines with energy electronics and regulate units, energy strength process composed of AC machines and gear strains, distinct computing device process with distinctive machines and unique quite a bit, electrical laptop procedure which includes AC machines and excitation units. in keeping with a unmarried coil, the Multi-Loop idea is punctiliously defined, and examples of the way to take advantage of the hot process are offered. This e-book 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 regulate. it is also a reference booklet for comparable technicians. This publication 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 collage.
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Additional info for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
When k is odd in which k 2P ¦ (1) n nc cos k[(n nc)S (i j )T qT ] nc 1 2 P cos[k (i j )T kqT ] When k is fraction or even, the above formula is zero. 10) in which k 1,3," ; wm and wa are the series turn number per phase of the main phase winding and auxiliary phase winding, respectively; kqT is the electric angle between k -th harmonic central lines of the main phase and auxiliary phase windings. 10) are deduced according to the phase winding with single branch. 10) are changed into wm / am and wa / aa , respectively, where a1 , am and aa are the parallel branch numbers of the corresponding phase windings respectively.
3, namely direct axis damping winding and quadrature axis damping winding. 3 Direct axis and quadrature axis damping winding of salient pole synchronous machine In practical salient pole synchronous machine, there are many damping bars, accordingly, there are many direct axis damping windings 1d , 2d ," , nd and many quadrature axis damping windings 1q, 2q," , nq. Therefore, normally two methods 25 AC Machine Systems are adopted for the analysis and calculation of damping winding; one is to calculate the parameters of each damping winding in terms of practical distribution of damping windings, the other is to replace all damping winding loops by a direct axis and a quadrature axis equivalent damping windings.
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.
AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance by Jingde Gao
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