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Motors and Windings

3HP three phase to single phase

Nicognruy

175

hace 5 años

Good afternoon, I was given a bank emery I would say industrial with a 3-hp three-phase motor and the problem is that at home I have single-phase. I measured resistance between coils and they are with very similar values and no derivative to ground or between them, is 6 terminals delta connection I wanted to consult you since I was looking a bit and you can go to single phase with a capacitor and changing the connection, I thank you if you can teach me what capacitor it takes if starting or running and how many mF and the connection. Thank you in advance and greetings from Uruguay.

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elektomaq

62.202

hace 5 años

Hello It is not possible to use it in that way because the machine requires 3 HP of power and when passing to single-phase, an important part of the motor force will be lost, even being burned due to overload also in the manuals section of this forum I have left an article that talks about the subject https://www2.yoreparo.com/motores-electricos/manuales/5773814/convertir-motor-trifasico-a-monofasico regards

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Nicognruy

175

hace 5 años

Hi elektomaq, Thank you very much for your response and contribution to the manuals,
I tell you that I am fully aware that the engine will have between 50 or 60% less than the original power but I do not want to put it aside and a fact that I forget to mention is that the machine is not with integrated motor but with pulleys and belt, neither I will give industrial use to this machine just weekend hobby ..
I also have motors up to 1/2 hp single phase but I think they will be completely useless for this.

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Nicognruy

175

hace 5 años

I read all the pdf you gave me but I still don't understand the calculation to know what capacitor I need,
Thanks a lot for your help, regards!

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mauro740923

209

hace 5 años

If it can be done just as you already mentioned, it loses some power but the transformation is perfectly feasible. Read this http://foro.metalaficion.com/index.php?topic=2994.0

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Nicognruy

175

hace 5 años

Hi mauro740923,
Tomorrow I will start calculating and buying the capacitors.
Thank you in advance for the reply, greetings!

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Nicognruy

175

hace 5 años

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hace 5 años

Hello, I want to give you the solution that worked for me, and it was the most concrete formula I found on the internet: Knowing that: 1Hp = 0.746 Kw 1 Kw = 70mF Then: Kw of the motor x 70 mF = the mF of the capacitor required for the motor already converted to single phase (divided) 1 Kw * this always in DELTA connection!

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