GE-发电机课件.ppt

Generator Fundamentals Generator Fundamentals - Objectives Generator Rotor Rev 0_11/16/2004 Property of GE ENERGY Learning Center - Proprietary Information for Training Purposes Only! GE Energy Learning Center g CLICK THE PICTURE Magnetic Lines of Flux will always form __________________ ? TB1-01 Complete Loops Flux has Direction, North to South MAGNET IRON Flux takes the path of Least Reluctance Permanent Magnets MMF = _________ x _____________ TB1-02 Power Source Wire Iron CURRENT Ampere Turns Current Flow North Pole Electromagnet How many brushes on your machine? How often should the brushes be checked? Every shift! Flux proportional to DC current Collector Ring Connections Current into the page Current out of the page Centerline of Poles A A View A - A ROTOR w/Field Windings + - Rotor Flux Rotor is a one piece forging with longitudinal slots cut into the field body to hold the field coils Rotor Windings What are the holes in the rotor windings for? ____________________ Cooling Rotor Winding, cool gas in, warm gas out The wedges that hold the rotor windings in place have holes to allow let gas in and out Conducting Components Collector End Cross Section Fields Example of Collector / Brush Field Rotor Fields Example of Brushless Field Rotor What could go wrong? What is it? Tried starting at turning gear speed, no field, closed the generator breaker For Sale…….Cheap A A View A-A STATOR ROTOR AIR GAP Flux Pattern inside the generator when the unit is: 1) Off Line Generator Off Line Flux 2) At rated Speed 3) At rated terminal volts Where are the rotor poles? Horizontal Where is the centerline of the flux? Horizontal Stator Iron Stator Winding Air Gap Rotor Forging Rotor Coil Stator Laminations STATOR CORE FRAME Note Key bars STATOR CORE LAMINATION ASSEMBLING STATOR CORE ALINGMENT OF STATOR WINDING SLOTS Stator Windings The stator bars are composed of