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Tool Talk Discussion Forum

Re: 3 phase converter

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Stephen Newell

02-01-2014 03:23:47

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While on the topic of phase converters, I have always wondered why it it recommended to use a higher HP motor on the idler motor on a rotary converter than the machine you are operating?

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02-02-2014 22:18:16

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 Re: 3 phase converter in reply to Stephen Newell, 02-01-2014 03:23:47  
Re-reading these posts about HM converters- it may be a matter of semantics- when I refer to the idler motor, I mean the one that spins the bigger 3 phase motor to get it running. Sounds like you and others may refer to the big one as the idler. A commercial rotary phase converter is just like a motor, without a shaft sticking out, and it"s controlled and started by built in capacitors.

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Stephen Newell

02-03-2014 03:56:29

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 Re: 3 phase converter in reply to JMS/.MN, 02-02-2014 22:18:16  
Yes that is the one I meant. It just seems to me that motor has more to do with dividing the phase to 120 degrees and I would like to understand why the HP matters.

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02-03-2014 07:20:11

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 Re: 3 phase converter in reply to Stephen Newell, 02-03-2014 03:56:29  
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Wouldn't the idler windings still need to handle the amps to power the 3 ph equipment.

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Dusty MI

02-03-2014 16:22:49

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 Re: 3 phase converter in reply to sflem849, 02-03-2014 07:20:11  
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I don't remember for sure but I think the idler motor needs to be 125% larger than the machine motor. Or if you are going run more than 1 three phase motor at a time, it needs to be 125% larger than the largest 3ph motor.
The more 3ph motors run at the same time the better the 3ph gets.

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02-01-2014 19:32:48

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 Re: 3 phase converter in reply to Stephen Newell, 02-01-2014 03:23:47  
With a homemade converter, the idler motor is small- anything big enough to spin the 3 phase motor used to make the converter. The converter motor needs to be bigger than the 3ph on the machine tool in order to develop enough power, as mentioned in another post.

I made mine with a 5 hp 3 phase, spun by a half horse single phase motor. It runs a 3 hp 3 phase turning lathe and a 3 phase Milwaukee mill. I had the motors and I think both switch boxes, just had to buy some cords and plug-ins. google HM phase converters for wiring diagrams and examples.

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