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AC Machine Systems: Mathematical Model and Parameters, - download pdf or read online

By Jingde Gao

ISBN-10: 3642011527

ISBN-13: 9783642011528

"AC laptop platforms" stresses either research tools and working performances of AC laptop structures, together with variable velocity force method of AC machines with strength electronics and keep watch over units, energy strength approach composed of AC machines and tool strains, detailed desktop procedure with specific machines and specified quite a bit, electrical computing device process which include AC machines and excitation units. in accordance with a unmarried coil, the Multi-Loop concept is carefully defined, and examples of ways to take advantage of the hot process are offered. This publication presents a brand new manner for interpreting the AC desktop structures. This e-book is designed for the researchers and postgraduates within the box of electrical machines and regulate. it is also a reference e-book 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 collage.

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Additional resources for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance

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44 ¨ m ¸ © l ¹ © cP ¹ © cm ¹ in which dt cP cm bP2 4 D1 2Sdt W  bP  2P ʌ (hm  2hP  2G ) W  bm  2P hP  G  The size of each part of the magnetic pole of the salient pole synchronous machine is shown in Fig. 1, here D1 is the inter diameter of the stator iron; G is air-gap length; hP and bP are the height and width of the pole shoes respectively; hm and bm are the height and width of the pole body, respectively. 64 1  bs / d c hs  1  bs / d c bs (for circular bar) 2 Ot § 2G · 1 ¨ ¸ 1 2G 2G G © bs ¹ ln arctan   ʌ 2 ʌbs bs bs The size of each part is referred to in Fig.

Under the state of 3-phase symmetry, the 3-phase currents are treated as equivalent current sheet. But, this method is not suitable for the inductance of stator single coil, discrete mode may be used to deal with it. Concrete method is as follows. When calculating the end region magnetic field produced by single coil current, the coil end part is divided into several current elements, and the magnetic field produced by the current elements is calculated in terms of Biot-Savart law. The magnetic field on each point of end region is the superposition of the magnetic field produced by all current elements.

14) is obtained. That is, self inductance is a special example of mutual inductance. 3 Mutual Inductance Between Excitation Winding and Damping Loop As mentioned above, suppose that current i fd flows into excitation winding, its mmf is rectangular wave, the air-gap flux density B ( x ) produced by it (refer to Fig. 18) From Fig. 5), it is known that the calculation formulas of air-gap permeance coefficient O2l of salient pole synchronous machine and the permeance coefficient Odk corresponding to harmonics flux density produced by rectangular wave excitation mmf are similar in form.

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

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