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 designing and developing modifications to electrical machines All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KSEGA Electrical machine design Evidence shall show an understanding of the design and development of modifications to electrical machines to an extent indicated by the following aspects T Motor windings principles and construction encompassing directcurrent machine types construction of direct current machine types of armature windings parallel circuits in armature windings magnitude of generated emf T Direct current armature windings encompassing terms used in armature winding effects of chording lap and wave windings progressive and retrogressive windings T Simplex lap windings encompassing simplex lap armature winding commutator pitch number and position of brushes characteristics of simplex lap windings equalising connections for armature windings applications for lap windings T Simplex wave windings encompassing simplex wave armature winding commutator pitch number and position of brushes dummy coils characteristics of simplex wave windings applications of wave windings comparison of lap and wave windings armature winding calculations T Commutation and interpoles encompassing principles of commutation conditions for sparkless commutation methods used to reduce sparking resistance commutation emf commutation interpoles or commutating poles advantages of interpoles T Alternator windings encompassing elementary single-phase stator winding elementary three-phase stator winding halfcoil and wholecoil windings concentrated and distributed windings chain lap and wave windings polepitch and coilspan halfcoil winding for a threephase alternator wholecoil stator winding for a threephase alternator T Breadth factor and sinusoidal output encompassing breadth factor emf equation for an alternator methods of obtaining sinusoidal wave form star and delta connection of alternator windings T Rating cooling and regulation encompassing rating of alternators cooling of alternators the voltage regulator T Testing techniques encompassing continuity insulation testing use of growler magnetic field testing |