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

By Jingde Gao

"AC computing device structures" stresses either research equipment and working performances of AC desktop platforms, together with variable velocity force procedure of AC machines with strength electronics and keep an eye on units, energy strength procedure composed of AC machines and gear traces, specific computer method with distinct machines and precise lots, electrical laptop approach along with AC machines and excitation units. according to a unmarried coil, the Multi-Loop thought is punctiliously defined, and examples of ways to take advantage of the recent procedure are provided. This booklet offers a brand new method for reading the AC laptop platforms. This ebook 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 college.

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Sample text

3) It may be seen that the mutual inductance depends upon the rotor position. Then, the mutual inductance between stator single coil AAc and damping loop 11c is analyzed. Referring to Fig. 5), the mutual inductance is calculated by the current flowing into the rotor. If it is calculated by the current flowing into the stator, the result is the same. e. e. the mutual inductances between damper loop and stator coil is relative to rotor position. After obtaining the mutual inductances between stator single coil and excitation winding or damping loop, the mutual inductance between stator loop and rotor loop consisting of them will be obtained easily.

26) Mutual Inductance Between Coils Calculating the mutual inductance between coils of stator winding is similar to the calculation of self inductance, and the only difference is that the angle D of the two coils should be considered. 33) where k and j are the certain values, the multiplier (k  j ) or ( k  j ) before the D· § angle ¨ J  ¸ is even only, and there is also 2¹ © Odkk  Oqkk 1 1 (O0  O2 k )  (O0  O2 k ) 2 2 O2 k Only when k is a positive integer, O2k has its value, otherwise O2 k 0 .

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. In the calculation, the effect of stator iron is replaced by image current, the effect of air-gap is replaced by air-gap current; now the end region magnetic field problem produced by a single coil current becomes the problem of the magnetic field produced by coil end part current, air-gap current and their image currents altogether in uniform medium.

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