# Three Phase Inverter

## Three Phase Inverter

Tags: IGBT Based Three Phase Inverter, Three Phase PWM Inverter, Three phase Inverter, Circuit Diagram for Three phase inverter,,
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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

###### 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.

###### 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.

###### 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