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Aim

To construct three phase inverter circuit and to analyze the different output frequency waveforms.

Apparatus required

three phase inverter Kit - 1Nos.

☞Patch chords - Required Nos.

☞CRO - 1Nos

☞10:1 CRO Probe - 1 No

Circuit Diagram

circuit-diagram-of-three-phase-inverter

Procedure

CRO Settings

☞Time (X) Axis : 5ms/div

☞Voltage (Y) Axis : 20V/div

☞Probe : 1:10 CRO Probe is suitable one.

Initial Settings

☞Ensure the 230V Power Supply is in proper with Tester.

☞Ensure the CRO is working properly with probe checking and proper ground line axis.

Mimic Diagram

mimic-diagram-of-three-phase-inverter

Experiment Steps

☞The connections are made as per the circuit diagram given above.

☞Switch on SW2 and observe the pulse waveforms.

☞Connect the motors R, Y, B terminal to the kit correspondingly.

☞Now switch on SW1.

☞Use increment and decrement key in the kit to vary the frequency and observe the speed variation.

☞Now to view the output waveforms follow the procedure below.

☞Disconnect the kit voltage and connect the external regulated power supply to the main circuit.

☞Set the voltage to 25V and check the output waveform at different frequency.

☞Note that motor load should be disconnected while using 25V input.

☞Observe the waveform using inc and dec key at different frequency.

Note: *If the connections are wrong the kit will get damage. * Please switch off the kit when not in use.

Model Waveform in DSO

igbt-pulse-from-controller


 


igbt-rb-phase


igbt-ry-phase


igbt-yb-phase

Observation

S.No

T

(ms)

Frequency

(Hz)

1

20

50

 

Model Calculation

F= 1/T

Where,

F is output frequency,

T is total time period (i.e) 360o

F= 1/ (20*10-3)

= 0.05*103

= 50Hz