Does an RPC always use capacitors, or are there other options?

rimcanyon · Jan 1, 2018

I've built several RPC's using capacitor banks and an idler motor. However, there is a 10HP RPC for sale on OWWM that has no capacitors. How does it work? Does it generate the third leg as effectively as an RPC without capacitors? The white box in the upper right is a wireless receiver. The seller says not to ask him any questions about how it works, he does not know...

Here are some photos:

johnoder · Jan 1, 2018

My rope start 7 1/2 HP ran the shop for years before I tried some "run" caps for balancing
The simple machines seemed to not care one way or the other

Bob-J-H · Jan 1, 2018

It may use the high resistance rotor method. Bob

Mark Rand · Jan 1, 2018

A good way would be to use a synchronous machine with over-rated squirrel cage winding. Then the field (rotor) winding can provide all of the reactive Volt-Amps for the load. No-one makes little ones because it is more complicated to control and more expensive. If my whole-shop inverter lets out its magic smoke, that's what I'll build though.

SAF · Jan 1, 2018

It clearly does have caps just missing in the photo. Last one shows start timer, start relay and wiring to caps. Cap loop wiring shown in the bottom of the photo.

SAF

rimcanyon · Jan 1, 2018

SAF said:
It clearly does have caps just missing in the photo. Last one shows start timer, start relay and wiring to caps. Cap loop wiring shown in the bottom of the photo.

SAF

Thanks SAF, you nailed it.

-Dave

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Does an RPC always use capacitors, or are there other options?

rimcanyon

Diamond

johnoder

Diamond

Bob-J-H

Hot Rolled

Mark Rand

Diamond

SAF

Stainless

rimcanyon

Diamond

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