ARMATURE MOTOR REWINDING
1. BASIC ELECTRICITY • Study of voltage, current , resistance and their units • Ohm's Law • Series and Parallel circuit and their properties with respect to winding • Types of Loads Inductive, Resistive, Capacitive • Power, Power factor, Disadvantages due to low power factor. • Methods of improve P. F. by using capacitor Bank. • To study types of supply.
2. TOOLS, AND WIRES WINDING MATERIAL, VARNISHING • Study of tools required for winding and study of their application. Types of plier, Types of Saw, Types of hammers, Special Tools required for winding work like Blow lamp, seasor, center punch, Bearing puller, wire pusher, Coil spreader, soldering iron etc. • Study of various types of insulating materials with respect to insulation class an temperature. • Insulating paper, sleeves, Tapes, wedges, varnish, Thread's etc. • Study about winding wires Enameled copper wire. • Varnishing Dipping and Brushing. • Study reason of varnishing, method's of varnishing. • Pretest before taking up winding for varnishing.
3. SPECIAL INSTRUMENTS REQUIRED IN WINDING AND METERS • Special instrument required for winding work • To measure gauge of conductor S.W.G. • To measure diameter of conductor micro meter. • For testing of motor's series parallel testing board • For armature testing Growler. • Meters used in winding work Voltmeter, Ammeter, Wattmeter, Multi meter, Oho Meter, Clamp tester, Digital etc.
4. MAGNET AND MAGNETISM • Study about magnet, Properties and types of magnet. • Study of electro magnet. • Definitions related to magnet Like magnetic pole magnetic field, magnetic lines, polar Axis, magnetic induction. • To study various laws related to electro magnet, Right hand rule, cork screw Rule, Fleming's right and left hand rule, faradays law of electro magnetic induction. • Self induction and mutual induction.
5. D. C. MOTORS • Definition of motor, it's application, Types of motors A.C. and D.C. • Main parts of D. C. Motors yoke, pole core, pole snoe, field coil, Armature, brush, bearing, front & End plate. • Working of D. C. Motor • Types of D. C. motor series, shunt and compound motor • Types of slot's make of starter, Armature and rotor Open type slot, Semi close slot, close type slot. • How to start D. C. shunt motor. • Losses and faults produces in D. C. motor. • Armature reaction • Inter pole.
6. TRANSFORMER, ALTERNATOR • Definition, working principle of Transformer • Main parts of Transformer • Step up and HT Transformer. • Transformer Ratio • Cooling method's of Transformer. • Current Transformer (CT) and Potential Transformer (PT) • Study of alternator, definition and working principal of Alternator. • Various terms used with reference to AC supply for ex Alternating current, cycle, frequency, Time period, peak value, R.M.S. value. • Study of star Delta connection • Know about poly phase.
7. A. C. MOTORS 91 PH, 3 PH) AND STARTERS • Definition of motor • Working principal of 3 ph and 1 ph motor's • To study various parts of A. C. motor • Study about various single phase motors • Split phase motor's • Capacitors motor's • Shaded pole motor • Universal motor. • Study about various Three phase motors. • 3 ph squirrel cage induction motor • Slip ring Induction motor • Faults and their reasons produce in A. C. Motors • Testing of Motor • Motor's and their applications • Starters required for 3 phase motors D.O.L. starter, Semi and Automatic star Delta starter R/F switch, Auto transformer starter.
8. CAPACITOR • Study the construction of capacitor • Some definition relating to capacitor Like Capacitance, capacitive Reactance. • Series parallel connections of capacitor • Testing of capacitor • Use of capacitor in electrical field.
9. WINDING TERMS • Study of various forms used in winding like Coil pitch, Coil span, Pole pitch, front pitch back pitch. • Know about Armature winding. • Lap and wave winding • Progressive and retrogressive winding • Single, Double and Triple layer winding • Study about how prepare Data and diagram of Armature winding • Balancing of armature. • Study of 1 ph stator winding Data / Drawing and which points to be noted when the done winding work. • Study of 3 ph stator winding Data / Drawing and which points to be noted when the done winding work. • Various definition related to winding like Coil, coil side, coil led, Tapping, Coil Group per phase coil, Layer and Double Layer winding in 3 ph motor.