Inline Exciter for 10ee?

WaltDizzy · Dec 28, 2022

This is being offered for sale on eBay:

Monarch 10EE Variable Speed Drive Generator Motor Reliance 3-VS Drive 220/440v | eBay

Find many great new & used options and get the best deals for Monarch 10EE Variable Speed Drive Generator Motor Reliance 3-VS Drive 220/440v at the best online prices at eBay! Free shipping for many products!

www.ebay.com

I spent a couple of hours digging through old posts on this forum, but I wasn't able to find a picture that would allow me to confidently identify the object on the end of the motor as an exciter suitable to replace the missing one for my 1941 round dial. I don't know if the eBay seller is offering enough information for a sure identification either.

It's being offered "working condition unknown". If it (the exciter) turns out to be broken, any guesses as to the probability of it being repairable?

Anyone have a known working exciter for sale?

Cal Haines · Dec 28, 2022

The unit pictured is an inline-exciter motor/generator (MG). It does have the exciter in place. Your machine did come with this type of MG. However, it's fairly rare to find a working inline exciter; I would be hesitant to take a chance on this one. Inline exciters are typically 230 VDC. A 115 VDC piggyback-type exciter won't work with your machine.

rakort · Dec 29, 2022

Yeah, I was lucky enough to come across one on the cheap. I probably paid $150 for my similar inline MG/exciter, main drive motor and control panel for maybe $150. $500 for this one sounds quite steep. If you get into negotiating a price I'd also be asking for (hard to take) pictures of the two commentators on this unit to help assess condition.

So what is wrong with yours? You say it is missing? I'm not sure how it could be missing. The exciter is on a common shaft with the motor and main generator in the unit and really can't be missing. Yeah, the stator could be removed, but the rotor would still have to be there.

Are there pictures someplace I missed?

Cal Haines · Dec 29, 2022

rakort said:
...

So what is wrong with yours? You say it is missing? I'm not sure how it could be missing. The exciter is on a common shaft with the motor and main generator in the unit and really can't be missing. Yeah, the stator could be removed, but the rotor would still have to be there.

Are there pictures someplace I missed?

photo:

Wiring repairs for 1941 Monarch 10EE

I purchased this motor-generator 10EE several months ago. Money was tight until recently. Now I have a 220 v 40A line feeding a 7.5 hp rotary phase converter in my shop. The lathe came with this box in the back. I think it was a DC converter box for running the DC motor. I damaged it in...

www.practicalmachinist.com

It looks like an inline exciter's rotor plugs onto the end of the generator's shaft. It appear to be held on by a long bolt, sort of like a draw bar:

It would be nice to see a better photo of the end of the generator's shaft. Maybe Walt can post one?

rakort · Dec 29, 2022

Good point, I remembered the nut at the end of the exciter after you mentioned it......I wasn't brave enough to touch it without a reason when I serviced mine. It seems probable although sketch that they extended the shaft with a tapered fit and a draw bar to essentially cantilever the exciter rotor out there.

My other question about Dizz's situation is the fact that piggy back exciters seem to share a raw casting with the round dials. It would appear that the piggy back exciter castings, depending on machining operations, could be interchanged with an inline exciter.

Cal Haines · Dec 29, 2022

I've never looked at that. My impression is that the main body of the motor and generator is just a tube, not a casting. You have one of each type, right?

rakort · Dec 30, 2022

Cal Haines said:
I've never looked at that. My impression is that the main body of the motor and generator is just a tube, not a casting. You have one of each type, right?

Yes I have both types. The tube for the main generator and motor I believe is like you said a straight tube (probably rolled and welded). I was referring more to the "end bell". I never compared them too closely before, but now I notice they aren't as similar as I thought, but the piggy back MG end casting has some inline artifacts or some features that were planned for something else possibly? It seemingly has a "flange" and bolt holes to mount something, but definitely different than the inline casting? See attached pix.

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Inline Exciter for 10ee?

WaltDizzy

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Monarch 10EE Variable Speed Drive Generator Motor Reliance 3-VS Drive 220/440v | eBay

Cal Haines

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rakort

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Cal Haines

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Wiring repairs for 1941 Monarch 10EE

rakort

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Cal Haines

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rakort

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