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1、Chapter 6 Electric Motor,6.1 Introduction 6.2 Operating Principle 6.3 Basic Structure 6.4 Nameplate 6.5 Mechanical Characteristics 6.6 Starting of asynchronous motors 6.7 Speed regulation 6.8 Single-phase asynchronous motor 6.9 AC servo motor 6.10 Three-phase synchronous motor 6.11 Step motor 6.12 D
2、C motor,6.1 Structure of the motor,stator, rotor, cover, base, shaft bearing, fan,etc.,Stator is composed of base, stator core and winding,1 stator,Base基座,core 铁心,Stator winding 定子绕组,End cover端盖,Stator is composed of base, stator core and winding,1 stator,Rotor is sorted by structure cage rotor wire
3、-wound rotor,2 rotor,Cage rotor 笼型转子,Wire-wound rotor 绕线型转子,3 Connections of the windings,Rotating Magnetic Field,6.2 Operating Principles,i1 = Imsint i2 = Imsin(t 120O ) i3 = Imsin(t + 120O),t = 0O,magnet,t =120O,t =360O,t =240O, Speed of rotating magnetic field n0 synchronous speed,Current complet
4、e one cycle,RMF complete one cycle,Current complete 50 cycles per sec, RMF complete 50 cycles, RMF complete 3000 cycles,Current complete (5060) cycles per min,1 n0 = 3000 = 60 f1 (r / min),revolution per minute,2 How to change n0 ?,Each phase is composed of one coils,Each phase is composed of two series coils,4 RMF ( f = 50 Hz ) :,3 If the pairs of poses is p,上一页,下一页,返回,上一节,下一节, Principle, Judge the direction of induced current in rotor winding by right-hand rule., Judge the direction of electromagnetism force by left-hand rule.,EMEM torque T The direction of T is the same with n0,