By Jingde Gao
"AC laptop structures" stresses either research tools and working performances of AC laptop structures, together with variable pace force procedure of AC machines with strength electronics and keep watch over units, strength power procedure composed of AC machines and tool traces, detailed laptop procedure with designated machines and distinctive a lot, electrical computing device process such as AC machines and excitation units. in response to a unmarried coil, the Multi-Loop conception is punctiliously defined, and examples of ways to take advantage of the hot method are provided. This e-book presents a brand new means for reading the AC laptop 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 ebook for comparable technicians.
This booklet 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
2 Phasor diagram of electric machine operation on load If the electric machine operates on load, the corresponding phasor diagram is shown in Fig. 2. Here, air-gap emf corresponding to air-gap flux density is EG . Based on the relation as in Fig. 2 and after getting EG , the saturation coefficient will be obtained in terms of EG and no-load characteristic (refer to Fig. 1) as follows: Kc d cf c d cec The effect of saturation is researched by using this method based on fundamental wave magnetic circuit under normal operation.
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.
1(b). 17) of the rotor damper loop inductances of the salient pole synchronous machine can be cited. 12) 1 2 3 , , ,"; E r is the short pitch ratio of the rotor loop; wr is the turn P P P number of the rotor loop, generally wr 1 ; i, j are the serial number of rotor loops; M is the electric angle between the central lines of rotor adjacent coils. Actually, the self inductances of all rotor loops have the same value, the mutual inductances between all rotor loops have another same value, and they are all independent of rotor position.