Download AC Machine Systems: Mathematical Model and Parameters, by Jingde Gao PDF

By Jingde Gao

ISBN-10: 3642011527

ISBN-13: 9783642011528

"AC computer platforms" stresses either research equipment and working performances of AC laptop platforms, together with variable velocity force method of AC machines with energy electronics and keep an eye on units, strength strength method composed of AC machines and tool traces, targeted computing device procedure with particular machines and certain rather a lot, electrical laptop procedure which includes AC machines and excitation units. in line with a unmarried coil, the Multi-Loop idea is punctiliously defined, and examples of ways to exploit the recent strategy are awarded. This ebook presents a brand new manner for reading the AC computer platforms. This publication is designed for the researchers and postgraduates within the box of electrical machines and keep watch over. it is also a reference ebook for similar 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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Extra resources for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance

Sample text

As in Fig. 2 Phasor diagram of electric machine operation on load If the electric machine operates on load, the corresponding phasor diagram is shown in Fig. 2. Here, air-gap emf corresponding to air-gap flux density is EG . Based on the relation as in Fig. 2 and after getting EG , the saturation coefficient will be obtained in terms of EG and no-load characteristic (refer to Fig. 1) as follows: Kc d cf c d cec The effect of saturation is researched by using this method based on fundamental wave magnetic circuit under normal operation.

5), then D SQ 2 will be obtained. 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.

15) It can be seen that while constant surplus torque with per-unit value 1 ( Tm  Te 1 ) is exerted on original standstill electric machine rotor, the per-unit value of the time equals H when the rotation speed is raised from zero to synchronous speed. 10 Analysis of Parameters and Performance of SinglePhase Induction Motors In the above sections, the basic electromagnetic relations of the salient pole synchronous machine are analyzed mainly, that is, related physical concept, basic voltage equations and flux-linkage equations, calculation method of each loop parameter of electric machine, electro-magnetic torque and rotor motion equation, etc.

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