One for JR

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It’s whats called a Schrage motor. The windings are in the rotor, not the stator, fed by slip rings. Then there is a second set of windings fed by the extra brushes that are used (as I understand it) to control torque by controlling the relative phase angles between them. The brushes move mechanically via a control wheel next to the motor. It’s kind of like a wound rotor motor than doesn’t need external resistors.

I’ve heard/read of them and a friend in Sweden has talked about them but I’ve never actually seen one. I don’t think anyone uses them here in North America, at least not anywhere in any of the plants I have worked in or on. So thanks for the “motor porn” Tony!
 
I’ve only ever seen one Schrage drive in action. It had me fascinated and I’ll admit I haven’t a clue how it works. I know how the speed advance and retard control works via a PLC, it’s the same as a VSD.

They were used on battle ships for gun turret orientation. I did have a USN white paper on the operating system, that got lost in the mists of time.
 
In looking for how they are used in battleship gun turrets, I got a real education on all that goes on in one. Wow! I had no idea just how complex it all is, how many people are involved in each individual gun and then the entire turret, and just how tight and miserable the work spaces are inside.
 
Jraef said:
In looking for how they are used in battleship gun turrets, I got a real education on all that goes on in one. Wow! I had no idea just how complex it all is, how many people are involved in each individual gun and then the entire turret, and just how tight and miserable the work spaces are inside.
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there is fascinating navy training videos of the mechanical "fire control computers" they used in the 40's and 50's. at least i find it fascinating :D

https://www.youtube.com/watch?v=s1i-dnAH9Y4
 
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