By Jingde Gao
"AC desktop platforms" stresses either research equipment and working performances of AC computer structures, together with variable velocity force procedure of AC machines with energy electronics and regulate units, strength strength process composed of AC machines and gear traces, detailed desktop procedure with targeted machines and designated quite a bit, electrical desktop procedure such as AC machines and excitation units. in response to a unmarried coil, the Multi-Loop concept is carefully defined, and examples of ways to take advantage of the recent technique are provided. This booklet presents a brand new method for reading the AC desktop platforms. This e-book is designed for the researchers and postgraduates within the box of electrical machines and keep watch over. it is also a reference publication for similar technicians.
This booklet is written in reminiscence of Professor Jingde Gao, past-president of Tsinghua college, 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
9 Electromagnetic Torque and Rotor Motion Equation of AC Machines Electromagnetic torque and rotor motion equation are important foundation for analyzing the electric machine operation performance. The electromagnetic torque of salient pole synchronous machine is discussed here. 4) In the above formulas, the minus before the related items of stator is caused by the regulation that the positive current produces negative flux-linkage. 4). 6) i constant where f is broad sense force, g is broad sense displacement.
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 . 14) is obtained. That is, self inductance is a special example of mutual inductance.
If the reference axis is another axis, and the axis of coil AAc lags behind the new axis by D a electric angle, then J in the formulas should be replaced by ( J D a ). In the mutual inductance between two coils, the influence of fractional harmonics and low order harmonics of the air-gap magnetic field is very strong. 830 u 10 4 H only, the difference between the two values is very large, which is produced by very strong fractional harmonics and low order harmonics of the air-gap magnetic field.
AC machine systems : mathematical model and parameters, analysis, and system performance by Jingde Gao