Download AC machine systems : mathematical model and parameters, by Jingde Gao PDF

By Jingde Gao

"AC desktop platforms" stresses either research equipment and working performances of AC laptop structures, together with variable pace force approach of AC machines with strength electronics and regulate units, strength power process composed of AC machines and tool strains, designated desktop method with specific machines and distinct a lot, electrical laptop approach along with AC machines and excitation units. in keeping with a unmarried coil, the Multi-Loop concept is punctiliously defined, and examples of ways to exploit the recent method are provided. This publication presents a brand new approach for examining the AC laptop structures. This publication 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 University.

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Additional resources for AC machine systems : mathematical model and parameters, analysis, and system performance

Sample text

The pitch of the stator coil of the electric machine is 7. When j ı 8 , the overlapping part no longer exists between the j -th coil and the first coil, hence using the permeance analysis method M 0G ( j ) is constant; then adopting the numerical analysis method, the larger the j is, the less the absolute value of M 0G ( j ) is. The latter result is more rational. 8 Inductances Produced by Leakage Magnetic Field Inductances produced by air-gap magnetic field (main magnetic field) are discussed in the above sections.

12) where | k  j | 0, 2, 4,";| k  j | 2, 4," . 13) where | k  j | 0, 2, 4,";| k  j | 2, 4," . 14) 1 2 3 , , ,";| k  j | 0, 2, 4,";| k  j | 2, 4,"; normally, it is sufficient P P P to take the definite order of k , j , 2l . The mutual inductance between damping loops 11c and 22c is calculated in the following (see Fig. 5). 15) where | k  j | 0, 2, 4,";| k  j | 2, 4," ; x2 is the abscissa on the rotor and its origin is on the axis of damping loop 22c ; E 2 is the short pitch ratio of damping loop 22c .

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.

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