By Jingde Gao
"AC computing device structures" stresses either research equipment and working performances of AC desktop platforms, together with variable velocity force process of AC machines with energy electronics and regulate units, strength power process composed of AC machines and tool traces, distinct computing device approach with precise machines and particular quite a bit, electrical desktop method including AC machines and excitation units. in keeping with a unmarried coil, the Multi-Loop thought is carefully defined, and examples of ways to take advantage of the hot method are awarded. This ebook presents a brand new means for interpreting the AC computing device platforms. This ebook 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 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 collage.
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Additional info for AC Machine Systems: Mathematical Model and Parameters, Analysis, and System Performance
3) 1 2 3 , , ," ; M minj represents the inductance between i -th coil under P P P m -th pole and j -th coil under n -th pole. B. 3). 3) is zero. 8) where k 1,3,5"; w1 2 PqwK is the series turn number per phase of stator winding; qkT 2 k yk kT q sin 2 sin kwk k yk k pk is stator winding factor. Based on the inductance of single coil, the mutual inductance between main 47 AC Machine Systems phase m winding and auxiliary phase a winding can be obtained similarly. If the turn number per coil of stator main phase winding is wKm , and the turn number per coil of auxiliary phase winding is wKa , the pitches of the main phase and auxiliary phase windings are the same, and the serial number of stator coil begins from the first coil under the first pole of the main phase winding, then the serial number of i -th coil under n -th pole of the main phase winding is (n 1)2q i , the serial number of j -th coil under nc -th pole of the auxiliary phase winding is (nc 1)2q q j.
Suppose that La1 , La2 are self inductances of coils a1 and a2 , M a1a2 is mutual 19 AC Machine Systems inductance between the two coils, then, in terms of the basic definition of the inductance, it is known that the self inductance of the whole loop-a (branch) is La \a \ a \ a i i 1 2 The flux-linkages of coils a1 and a2 are, respectively \a \ a a \ a a \a \ a a \ a a 1 2 1 1 1 2 2 1 2 2 where \ a1a1 ,\ a2 a2 are self flux-linkages, \ a1a2 or \ a2 a1 is the mutual flux-linkage of the two coils.
The reason why the above method is adopted is to illustrate its concrete usage. The rotor circuit of the single phase induction machine is shown 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.