By Jingde Gao
"AC computing device structures" stresses either research tools and working performances of AC computing device structures, together with variable pace force method of AC machines with strength electronics and keep watch over units, strength strength procedure composed of AC machines and gear strains, specific computing device process with designated machines and exact a lot, electrical computer procedure along with AC machines and excitation units. in response to a unmarried coil, the Multi-Loop conception is punctiliously defined, and examples of the way to exploit the hot strategy are offered. This publication offers a brand new approach for studying the AC desktop structures. This publication is designed for the researchers and postgraduates within the box of electrical machines and keep watch over. it is also a reference publication for comparable technicians. This publication 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 collage.
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Extra resources for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
At the same time, it is needed to calculate the inductances of stator single coil, then by combining them the inductances of stator phase winding are obtained. In the following, firstly the inductances related to air-gap main magnetic field are researched, sum of the inductances caused by the main magnetic field and leakage one are the inductances of stator phase winding. 1 Inductances of Single Phase Induction Machine Induction machine is with uniform air-gap, its air-gap permeance is constant.
The above formula is the expression of j - th harmonic flux density produced by d-axis k - th harmonic mmf when the axis of the damping loop11c and the rotor d-axis overlap each other. 28 1 Circuit Analysis of AC Machines — Multi-Loop Model and Parameters After getting the expression of the air-gap flux density, the flux-linkage of each loop is obtained, and the inductance of each loop will be gained. Firstly, the self inductance of damping loop 11c is calculated. 12) where | k j | 0, 2, 4,";| k j | 2, 4," .
1 Excitation mmf and its air-gap flux density 23 AC Machine Systems rectangular wave with a width of S radians approximately. 3) Inductance of Damper Winding Normally, the damper winding of the salient pole synchronous machine is cage type with damping bars and damping rings; the damping bars are short-circuited by damping rings fully or partially, and it is usually symmetric to the direct axis or quadrature axis. In such cage circuit, the selection of current loop may be arbitrary. 2 represents damper winding with 4 damping bars per pole; in the figure the selected damping loops are symmetric to the direct axis or quadrature axis, and loops 1d , 2d are symmetric to direct axis, loops 1q, 2q are symmetric to quadrature axis.
AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance by Jingde Gao