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Table of Content

https://www.vskills.in/certification/Vskills-Certified-AC-DC-Motors-Rewinding-Mechanic-Table-of-Content

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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

Certified AC-DC Motors Rewinding Mechanic

How It Works

Test Details

Benefits of Certification