3 Phase inverter - Electronic Circuits Projects Diagrams Free

sp_vibes · 25th October 2008, 04:58 PM

Hi,

I am looking to build a 3 phase inverter to control an induction motor. What would be the best way to go about this? I am looking to control the inverter bridge through a microcontroller with a DC source variac to feed the inverter. I know there are a few ways of doing it, but which is the best route to go down?

Diver300 · 25th October 2008, 05:49 PM

If you get something like:-
EUROTHERM DRIVES|650-011-230|INVERTER, 1 PHASE, 1.1KW | Farnell UK

That does the whole lot for you.

If you want to control the motor differently, buy one and just use the power electronics from it.

They have a bridge rectifier, and 6 transistors to make the variable 3 phase. Some have a regulator to change the DC voltage.

sp_vibes · 25th October 2008, 06:39 PM

Quote:

Originally Posted by Diver300

If you get something like:-
EUROTHERM DRIVES|650-011-230|INVERTER, 1 PHASE, 1.1KW | Farnell UK

That does the whole lot for you.

If you want to control the motor differently, buy one and just use the power electronics from it.

They have a bridge rectifier, and 6 transistors to make the variable 3 phase. Some have a regulator to change the DC voltage.

This is a project and I must build at much as the drive as I can without buying things that do things for me. I am looking to either use PWM techniques or a six step voltage source to run the motor effectively. Any ideas?

sp_vibes · 26th October 2008, 11:26 PM

Any advice guys?

jrz126 · 27th October 2008, 04:04 PM

How big is the motor you need to drive?

If it is small, you might be able to use one of these: http://www.fairchildsemi.com/ds/FS%2FFSBB20CH60C.pdf I think this module is capable of 2kw at 220VAC
You may even be able to get some free samples. Fairchild Semiconductor - Site Search - Motion - SPM(TM)

sp_vibes · 27th October 2008, 07:39 PM

Very small motor, about 50watt at about 40VAC. This may work then, thanks.

fsmyth · 28th October 2008, 05:46 AM

3-Phase Stepper Motor Drivers

sp_vibes · 30th October 2008, 12:44 PM

Ok guys, I have a DC source variac to supply the inverter circuitry. However, this DC souce must be altered in accordance with the frequency to maintain the air flux gap, therefore I am going to build a DC-DC buck boost converter to control the DC voltage into the inverter. The inverter will then switch this DC voltage to generate a six step square wave across the 3 phase induction motor. Can anyone see any problems with doing this?

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25th October 2008, 04:58 PM	(permalink)
sp_vibes	3 Phase inverter Hi, I am looking to build a 3 phase inverter to control an induction motor. What would be the best way to go about this? I am looking to control the inverter bridge through a microcontroller with a DC source variac to feed the inverter. I know there are a few ways of doing it, but which is the best route to go down?

25th October 2008, 05:49 PM	(permalink)
Diver300	If you get something like:- EUROTHERM DRIVES\|650-011-230\|INVERTER, 1 PHASE, 1.1KW \| Farnell UK That does the whole lot for you. If you want to control the motor differently, buy one and just use the power electronics from it. They have a bridge rectifier, and 6 transistors to make the variable 3 phase. Some have a regulator to change the DC voltage.

26th October 2008, 11:26 PM	(permalink)
sp_vibes	Any advice guys?

27th October 2008, 04:04 PM	(permalink)
jrz126	How big is the motor you need to drive? If it is small, you might be able to use one of these: http://www.fairchildsemi.com/ds/FS%2FFSBB20CH60C.pdf I think this module is capable of 2kw at 220VAC You may even be able to get some free samples. Fairchild Semiconductor - Site Search - Motion - SPM(TM) __________________ Jeff To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.

27th October 2008, 07:39 PM	(permalink)
sp_vibes	Very small motor, about 50watt at about 40VAC. This may work then, thanks.

28th October 2008, 05:46 AM	(permalink)
fsmyth	3-Phase Stepper Motor Drivers

30th October 2008, 12:44 PM	(permalink)
sp_vibes	Ok guys, I have a DC source variac to supply the inverter circuitry. However, this DC souce must be altered in accordance with the frequency to maintain the air flux gap, therefore I am going to build a DC-DC buck boost converter to control the DC voltage into the inverter. The inverter will then switch this DC voltage to generate a six step square wave across the 3 phase induction motor. Can anyone see any problems with doing this?