电工英语版chaper6

1、chapter 6 electric motor6.1 structure of the motorstator, rotor, cover, base, shaft bearing, fan,etc.stator is composed of base, stator core and winding1 stator1 statorbase基座基座 core 铁心铁心 stator winding 定子绕组定子绕组 end cover端盖端盖 stator is composed of base, stator core and winding1 stator1 stator rotor i

2、s sorted by structure cage rotor wire-wound rotor 2 rotor2 rotorcage rotor 笼型转子笼型转子wire-wound rotor 绕线型转子绕线型转子 3 connections of 3 connections of the windings the windingsu1v1w1u2v2w2u1v1w1w2u2v2u1v1w1w2u2v2star connectionu1v1w1w2u2v2delta connectionu1v1w1u2v2w2u1u2v1v2w2w1outinrotating magnetic fiel

3、d6.2 operating principlesi1 = imsinti2 = imsin(t 120o )i3 = imsin(t + 120o)t = 0o i1 = 0i2 0i3 0 u1u2v1v2w2w1nsi1i2i3mitu1v1w1magnetu1u2v1v2w2w1u1u2v1v2w2w1nst = 0o t =120o nsi1 0i2 = 0i3 0 i1i2i3mitu1u2v1v2w2w1u1u2v1v2w2w1 t =360o t =240o nsnsi1 0i2 0i3 = 0 i1 = 0i2 0i3 0 speed of rotating magnetic

4、 field n0 synchronous speedcurrent complete one cyclermf complete one cyclecurrent complete 50 cycles per sec rmf complete 50 cycles rmf complete 3000 cyclescurrent complete (5060) cycles per min1 n0 = 3000 = 60 f1 (r / min)2 how to change n2 how to change n0 0 ? ?u1u2v1v2w2w1u1u3u2u4v1v2v3v4w2w1w4w

5、3each phase is composed of one coilseach phase is composed of two series coils600pfn =min）r/( p12 3456n0/(r/min)3000150010007506005004 rmf ( f = 50 hz ) :3 if the pairs of poses is p上一页上一页下一页下一页返回返回上一节上一节下一节下一节 principlens judge the direction of induced current in rotor winding by right-hand rule. judge the direction of electromagne