Table of Content
  

Fundamental terms used in AC winding

  • Coil
  • Turn
  • Active side of a coil
  • Inactive side of a coil
  • Leads of a coil
  • Pole pitch
  • Coil pitch/span and coil throw
  • Pitch factors
  • Coil group
  • Coil connections
  • Pole connection
  • Whole-coil winding
  • Half coil winding
  • Single layer winding
  • Double layer winding
  • Balanced winding
  • Unbalanced winding
  • Concentrated winding
  • Distributed winding
  • Partially distributed winding
  • Fully distributed winding

DIFFERENT TYPES OF AC WINDINGS

  • Basket winding
  • Concentric winding
  • Skein winding
  • Flat loop Noon-overlapped winding
  • Flat loop overlapped or chain winding
  • Skew winding
  • Diamond coil winding
  • Involute coil winding
  • Electrical degrees
  • Phase displacement    

Table fan- terms- types of motors- winding details – data to be collected

  • Terminology pertaining to table fan as per I.S. 555-1979
  • Table type fan
  • Rated voltage
  • Rated speed
  • Blade sweep
  • Winding Shaded pole type table fan
  • Capacitor motor
  • Grouping of coils in table van
  • Procedure of preparing winding table for capacitor type table van
  • Determine the winding table for the arrangement of coils
  • Winding capacitor type table van
  • Data

Testing of windings

  • Continuity test/resistance test
  • Short circuit test/growler test
  • Internal growler method
  • Voltage drop method
  • Ohmmeter method
  • Polarity test
  • Magnetic compass method
  • Two screwdrivers method
  • Polarity test by search coil method
  • Unbalanced current test
  • No-load test

Insulating and varnishing process in electric machines

  • Air drying varnish
  • Baking varnishes
  • Thermosetting varnishes
  • Solvent less varnishes
  • Varnish thinners
  • Preheating
  • Impregnation process
  • Varnish stripping
  • End connections
  • Method of coil connections
  • Method of lead connections
  • Shaping and binding the overhangs

Rewind a ceiling van

  • Terminology used in ceiling fans
  • Capacitors
  • Suspensions system
  • Earthing
  • Insulation resistance
  • Method of stripping the winding of the ceiling van
  • Preparing the winding table for Ac single phase permanent capacitor type ceiling van
  • Whole coil connection
  • Winding calculations
  • Determine the coil group
  • Winding calculations
  • Determine the coil groups
  • Method of preparing former and winding coils
  • Method if winding van motor
  • Classification of insulation according to thermal class
  • Cuffing
  • Coil separator
  • Wedge separator/paking strip
  • Wedge
  • Overhang inter-phase insulation
  • Connections
  • Slot liner Cuffing
  • Coil separator
  • Wedge separator/paking strip
  • Wedge
  • Overhang inter-phase insulation
  • Connections

Single phase, split phase type motor winding (concentric coil winding)

  • Split phase type
  • Winding calculation and diagrams for concentric type winding

Winding a three phase induction motor – single layer distributed winding

  • Distributed type winding
  • Single layer winding
  • Calculation for single layer distributed winding
  • Method of overlapping
  • Overhang Insulation
  • End connections

Winding a three-phase induction motor – single layer concentric type – half coil connection

  • 3-phase concentric winding
  • Merits
  • Demerits
  • Grouping
  • Grouping of coils

Winding a 3 phase induction motor- double layer distributed type winding

  • Grouping
  • Coil throw
  • Winding sequence
  • End connections
  • Coil connections
  • Placing of the coils in double layer winding

Starter for 3-phase induction motor, its necessity – basic contactor circuit- its parts and their functions.

  • Necessity of starter
  • Selection of starter
  • Contactors
  • Power circuit
  • Control circuits
  • Push-button actuation from one operating location
  • Push-button actuation from two operating location
  • Purpose of overload relays
  • Magnetic overload relay
  • Bimetallic overload relay
  • Relay setting
  • Tripping of starters
  • No-volt coil
  • Coil voltages
  • Troubleshooting in contactor

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