# 6 phase comparison to a 3 phase machine

#### Petros.Alexakis

Joined Mar 10, 2016
8
Hi I am new to the forum. If we have a permanent magnet motor that is 1kw in power if the motor is 3 phase will require P=3*Vφ*Ιφ and when it is a 6 phase motor will it need P=6*Vφ*Ιφ? I know it is silly but I am strugling

Thanks

#### tcmtech

Joined Nov 4, 2013
2,867

What are you trying to do?

#### Petros.Alexakis

Joined Mar 10, 2016
8
Design an inverter. And i want to decide the current rating of the devices I am going to use. If by increasing the phases I decrease the current it will be very helpfull

#### tcmtech

Joined Nov 4, 2013
2,867
All you will be doing is dividing up the total load by more devices and using more wire to connect everything to the motor so how does that factor into your concept?

#### Petros.Alexakis

Joined Mar 10, 2016
8
Device current is really important because I need a motor that rquires a lot of current. If I can reduce the ammount of current my devices see it is really important

Joined Jul 18, 2013
28,825
How is the motor commutated? Does it have any commutation devices?
Max.

#### tranzz4md

Joined Apr 10, 2015
310
An alternating current, polyphase, permanent magnet motor, eh? And you're firing it off a DC buss, and trying to make it a 6-phase motor and matching inverter, to minimize "device current".

And it's an automotive application, (and want that to be evident) because you're keeping this in our automotive forum.

At this point you're claiming or imagineing 380A rms @36v /phase and cant figure out how much 48V DC you'll be drawing off that buss.

Well, I'm anxious to see these answers too. This PM ACmotor thing sure sounds unusual, but I dont get away from the old class B 3-phase workhorses very often anymore.

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