3 phase motor 0n/Off control

Other Hardware Motors, Mechanics, Power and CNC
1

Hi dear friends,
My coulege and me are working on some machine automation project with arduino (UNO or MEGA) and we need some help about 3 phase motor driving. The motor is 750W three phase squirrel cage type. Our task is only to start it, stop it and change the direction. Our thinking is to use economic opto isolated Light Dimmer Module - something like this:

Triac Board

and use three triac channels for one direction and three channels for other direction acording to simple attached diagram. Of course triacs should be of properly voltage and amperage taking into account motor starting current peak...

Is that solution good enough or there is some better/safer solution ??

We appreciate a lot any comment/advice/proposal...
Thank you very much!

3phaseMotorDri1ve.gif
3phaseMotorDri1ve.gif2000×1500 1.15 MB

2

A simpler method might be to use two relays.

One to enable a proper contactor for drive and another dual pole to swap two phases.
Of course programming is crucial to prevent direction change without stopping the motor first.
But that would be the same regardless of which way you choose to prevent motor damage.

I know this project has been done before for Arduinos as there are a lot of google results for it. (hint)

Bob.