tailieunhanh - Handbook of Small Electric Motors MAZ Part 13

Tham khảo tài liệu 'handbook of small electric motors maz part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | __CHAPTER 6__ ALTERNATING-CURRENT INDUCTION MOTORS Chapter Contributors Brad Frustaglio Andrew E. Miller Earl F. Richards Chris A. Swenski William H. Yeadon INTRODUCTION This chapter covers the most common types of ac induction motors including polyphase and single-phase motors. Section develops the theory of operation first for polyphase and single-phase operation including combined winding operations for split-phase capacitor-start and capacitor-run motors. Next the section develops the two-phase motor and develops single-phase motor theory using the revolving-field and symmetrical-components approach. Finally Sec. develops the three-phase polyphase motor theory. Then Sec. develops geometry flux path and performance calculations for the most common configurations of single-phase motors. Next the section discusses the shaded-pole motor using the cross-field theory as developed by P. H. Trickey and S. S. L. Chang. Modified calculation procedures are included. Finally the section finishes the calculations by developing geometry flux path and performance calculations for the polyphase motor. Stator and Coil Assemblies A typical stator and coil assembly is shown in Figs. and . The stator cores discussed in Chap. 3 are wound with magnet wire in order to produce the magnetomotive force mmf that produces the torque. Section contributed by William H. Yeadon Yeadon Engineering Services PC. CHAPTER SIX FIGURE Stator and coil assembly diagram. Windings Stator and coil assemblies for induction motors usually have distributed wound cores. The objective here is to produce a sinusoidal air gap mmf. A coil of wire as shown in Fig. produces a square-wave mmf. A distributed winding improves this condition. Next is an example of how sinusoidal distribution is determined. This is followed by tables showing near-sinusoidal winding distributions for some common poletooth combinations. FIGURE Stator and coil assembly lead

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