Electrical Machine Trainer

INTRODUCTION 
Three phase AC induction motors are very popular in industrial drives. The application may change in direction of rotation. The AC motor theory explains that change in phase sequence of applied AC voltage as connected to motor windings, reverses the direction of rotation. This is achieved in this panel using F /R Three pole - two ways with centre off sweeten. As shoving in FWD' position the phase sequence is - R - Y – B In 'REV' position the same is - Y - R – B 3 Phase motors take very high starting currents at the time of starting. One of the solutions to control this current is to apply reduced voltage at the time of starting. The six Shrouded Sockets of three stator windings can be brought out. Externally the Shrouded Sockets may be connected in STAY'. At the time 2 starting to ensure reduced applied voltage. As the motor ricks up the speed, the windings may he connected in DELTA. This ensures full voltage to he applied. The STAR / DELTA switch mounted on this panel provides this arrangement. STAR - connects U1, V1.W1 to form star point, and input supply is given to U2, V2, .W2. DELTA connects U2-V1, V2 - WI, W2 – U1. to form a delta and input supply is given to delta junction points. This is achieved using 3 poles 2 ways with centre off switch.

SALIENT FEATURES
1.    Facilitates easy and safe wiring by students due to use of 4mm sturdy Shrouded banana patch cords and shrouded socket arrangements for high voltage circuits
2.    Each panel is made of non-breakable  tough plate and screw-less overlays showing circuits diagrams & its connection tag numbers for easy understanding and connection
3.    Numerous possibilities of testing of electrical circuits.
4.    Separate motor re-winding of motor rotors: assembly & re-assembly of a motor
Name of the Experiments
Experiment – 01    To study the working of dol starter and measure the line & phase  voltageon multifunction meter
Experiment – 02    To study speed torque curve of dc shunt motor
Experiment – 03    To study speed torque curve of dc series motor
Experiment – 04    To study speed torque curve of dc separately excited motor
Experiment – 05    To study speed torque curve of dc compound motor
Experiment – 06    To study v-i, efficiency curves for dc shunt generator
Experiment – 07    To study v-i, efficiency curves for dc series generator
Experiment – 08    To study v-i, efficiency curves for dc separately excited generator
Experiment – 09    To study v-i, efficiency curves for dc compound generator
Experiment – 10    To study the working of 3 phase slip ring induction motor with star/ delta starter with rotor shorted and with different rotor resistance
Experiment – 11    To study speed torque curve of 3 phase slip ring induction motor with rotor shorted and with different rotor resistance
Experiment – 12    To study v-i curves & efficiency of synchronous generator
Experiment – 13    To study speed torque curve of 3 phase synchronous ac motor
Experiment – 14    To study starting of universal motor with ac supply 
Experiment – 15    To study speed torque curve of universal motor with 150v dc supply
Experiment – 16    To study speed torque curve of capacitor start induction motor with direction control 
Experiment – 17    To study speed torque curve of 3 phase ac squirrel cage induction motor    
Experiment – 18    To study synchronization of 3 phase synchronous motor with main supply using three dark lamp method
Experiment – 19    To study synchronization of 3 phase synchronous motor with main supply using two bright and 1 dark lamp method
Experiment – 20    To study the working of single phase transformer and calculate its turn's ratio
Experiment – 21    To study the polarity test of single phase transformer
Experiment – 22     To study the open circuit test of single phase transformer 
Experiment – 23    To study the short circuit test of single phase transformer
Experiment – 24    To study the parallel operation of single phase transformer
Experiment – 25    To study single phase transformer regulation
Experiment – 26    To study speed voltage curve of dc tacho generator