8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and winding coils. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KS01-EG150A Coil winding and coil testing Evidence shall show an understanding of coil winding and coil testing to an extent indicated by the following aspects: T1 Coil data to be collected: Type of wire. Gauge. Number of turns. Type of coil. Type of insulation. Coil shape. T2 Coil former types and construction/set up Coil shapes Factors which govern coil shape: end room; coil flexibility; bore size of stator iron core; depth of iron below the slots, in the iron core; pressure points between the coils Types coil winding formers T3 Coil winding machines Identify machine types: foot pedal, variable speed, winding head fitted with a chuck; Remote foot switch on a flexible lead, variable speed fitted with a face plate; layer winding machine; computer operated Operational safety precautions T4 Coil insulations. Purpose Temperature ratings Common insulating materials Polyester film backed elephantide; Nomex; Mylar; Nomex/mylar/nomex; Dacron/mylar/dacron; cloth, tape, and adhesive tape (glass); polyester glass laminate; sheet, tape, and adhesive tape (polyester film); Bakelite paper laminates T5 Rewind small and medium size solenoid coils Strip and record data Prepare/insulate coil formers Wind each type of coil Finishing off process Test procedures T6 Types of testing devices Multimeter; Series light; Insulation resistance tester; Wheatstone bridge T7 Purpose of testing devices Multimeter; Series lamp; Insulation resistance tester; Wheatstone bridge T8 Types of tests Continuity Short circuited turns Insulation resistance T9 Testing techniques to identify faulty coils Physical inspection. Using a testing device. |