By Jingde Gao
"AC computing device structures" stresses either research tools and working performances of AC desktop structures, together with variable pace force approach of AC machines with energy electronics and keep watch over units, strength strength method composed of AC machines and tool traces, distinctive computing device approach with exact machines and detailed a lot, electrical computing device approach along with AC machines and excitation units. in line with a unmarried coil, the Multi-Loop thought is punctiliously defined, and examples of ways to exploit the hot procedure are provided. This e-book offers a brand new approach for interpreting the AC computing device platforms. 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 ebook for comparable technicians. This e-book 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
10). It can be seen that the inductances of stator phase winding of the single phase induction machine are independent of rotor position owing to uniform air-gap. 10) can be calculated directly too, based on main phase and auxiliary phase windings; that is, according to the air-gap mmf produced by the main phase and auxiliary phase windings, the corresponding air-gap flux density is calculated. If several different connection types of the main phase and auxiliary phase windings exist, then respective 49 AC Machine Systems calculations are needed based on actual connection.
In such an instance, it is more suitable to select damping loops based on Fig. 4. The inductances of such damping loops are discussed in the following. As for the parameter calculation relative to d-axis and q-axis damping windings or equivalent damping loops, the details are available in various books and hence do not need to be discussed here. 4 Selection of damping loops of salient-pole synchronous machine Referring to Fig. 5 Model for calculating inductances of salient pole synchronous machine 26 1 Circuit Analysis of AC Machines — Multi-Loop Model and Parameters nE S 2 wr i sin 1 , wr is the turn number of the damping loop (normally 2P nS wr 1 ), E1 is short pitch ratio of the damping loop; x1 is the abscissa on the rotor, its origin is located on the axis of damping loop 11c .
7), Te is consistent with rotor rotation direction, that is Te is driving torque. e. 8) When the rotor motion equation of the electric machine is set up, the generator is considered as a standard, such as in Fig. 1. 9) dZ is angular dt acceleration. 10) where the unit of J is mechanical radian; the unit of t is s ; the unit of Tm and Te is N m; the unit of J is kg m 2 . 11) where P is the pole pair number of the electric machine. In practice, per-unit value is adopted mostly in the above formula.