Introduction: The Most Simple and Efficient ROTOVERTER Setup on the Internet

Picture of The Most Simple and Efficient ROTOVERTER Setup on the Internet

Items used for the experiment:

1 electric motor (4 kw 3 ph ). The rotor must rev very easy by hand.

2 capacitors (10 uF 400 V each).

Wiring diagram: The motor must be wired in Rotoverter mode, i.e. in STAR configuration (not DELTA).

Pole nr.1 and 2 must be connected to the capacitors. The 2 capacitors are in parallel.

Pole nr. 1 and 3 must be connected to the grid (220V in my country).

When connected to the grid the rev rise until 2840 - 2850 rot/min and the current drops from 4.5 to 0.7 Amps.

If I disconnect the capacitors the current drop to 0.2 Amps. When I connect a load the current rise to 1.2 Amps, but when I reconnect the capacitors the current drops to 0.0 Amps. If I increase the load beyond the sweet point, the curent start to rise until 4.5 Amps when the motor halts. You may see the demonstration on youtube:

Step 1: The Motor Used

Picture of The Motor Used

Step 2: The Capacitor Used

Picture of The Capacitor Used


SorinMS (author)2015-06-09

You may see that video at

SorinMS (author)2015-06-07

With no load, I have 1 Amps and 2850 rot/min (as labeled on motor plate). When I feed a small electric motor from one of the capacitor the amperage drops to 0.4, 0.5 Amps and the revs are 2990 rot/min. Strange, very strange. I'll post a video on youtube.

DIY Hacks and How Tos (author)2015-06-07

Interesting. Could you share some more details on how it works and how you use it.

SorinMS (author)2015-06-06


SorinMS (author)2015-06-06

No offence, but it was invented google for that.

jaime alexandred (author)2015-06-06

ROTORVERTER is a unknown word, what is the application of it?

discostu956 (author)2015-06-06

Hey. Do you mind giving a little background info for those of us unfamiliar with what a rotoverter is? I'm off to Google, but thought it might be really good to put in your write up for others

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