The Breakroom > The Water Cooler

Phase Converters !

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RobWilson:
Here we go  :bang: 

A VFD is not what I am looking for ,thought that was clear . I am looking for a larger  Rotary Phase Converter to run my shop , As Jo points  out I would need 3 VFD's  on each milling machine and 2 per lathe .  so thats  17 VFD'S in total  .



Jo, Pete  any chance I could please  trouble you for a photo of the inside of your Transwave converters ,just interested to see whats inside the box .

Cheers Rob

awemawson:
A true rotary converter uses the dual wound motor to transform from 240v to 415v, but it is perfectly practical to use a separate transformer for this function, and a pilot motor together doing the same function.

Before I moved here and had 3 phase delivered to the door I made several static and rotary phase converters, and also had a couple of Transwave ones which were super reliable.

All you need is a transformer, a pilot motor, a voltage sensitive relay and two banks of capacitors (start & run). Capacitors are best to be paper / oil filled and rated at 500v

(the voltage sensitive relay 'looks' at the third (generated) phase and switches in / out the start bank of capacitors)

RobWilson:
Hi Andrew , Interesting .

Did your Transwave use a dual wound motor as a rotary transformer ?    from the few photos I have seen on the web of the larger converters, there dose not seam to be a separate transformer .

The other supplier I mentioned in post 1 looks to use a separate step up transformer ,similar to whats in my static converter I have now .   

any pros cons to either method ?

To lazy and I dont have the time to make one  :palm: 


Rob   

inthesticks:
Morning Rob I just dug these out and then read your not interested in building one. I will upload them anyway you may find the 7.5 HP schematic interesting and others may be interested in building their own.

Cheers
CB

awemawson:
Rob, yes both my Transwave Rotary Converters used a dual wound motor to get the higher voltage. I specified '5 wire' output ie 3 phases, neutral and earth, as having the neutral at the machine is often very useful for running 240 volt single phase lights etc between phase #1 and neutral.

(You can just add a pilot motor to your current static converter which will allow starting of much larger loads than without it)

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