Many industrial applications require a variable-voltage dc source, therefore, it is necessary to be able to convert a fixed voltage into a variable voltage. This variable dc voltage can be obtained either from an ac supply voltage or from a fixed dc supply voltage. From a fixed dc supply voltage (available either from batteries or from uncontrolled rectifiers) a variable dc output voltage can be obtained either by an ac link chopper or a dc chopper.
- Record the Input voltage , Load voltage , load current and RPM of the Motor by increasing the chopping frequency of the thyristor chopper .
- Observe the trigger circuit output waveforms on the oscilloscope at Test Points ( TP ) ; viz, TM and TA.
The setup consists of :
- 0.5 HP DC series Motor
- DC fed chopper control circuit
- Digital Voltmeter 2 no.
- Digital Ammeter
- RPM Meter
- Proximity Sensor
- Protection Circuit
- MCB, Indicator Lamp, Fuse, Terminals etc.