Koster powered trucks

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Koster powered trucks

Post by skid-roe » Sun Jun 17, 2018 4:44 pm

I found a pair of Koster's powered switcher trucks.
There are 4 wires per motor & no name plates, does anyone what the voltage they are and motor wiring hook up?
Ken Roeh

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Re: Koster powered trucks

Post by ALCOSTEAM » Sun Jun 17, 2018 7:00 pm

Those look similar to the old cannonball motors. Very inefficient motors, high current drain for the work you get out of them. If you use the trucks I would find replacement permanent magnet motors to replace the old 4 wire field wound motors.

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Re: Koster powered trucks

Post by jamesjgould » Mon Jun 18, 2018 12:39 pm

Call Bill Koster. 863-314-2841
5 batt elec
44 cars rolling stock
2400' 7 1/2" track

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Re: Koster powered trucks

Post by kc6uvm » Tue Jul 17, 2018 9:58 pm

I had a couple of those motors. They were re-purposed surplus Westinghouse aircraft starter motors. 24 Vdc series wound. The motors were rewired to split off the armature from the field. Idea was to introduce a back EMF voltage (think reverse the polarity of the field) using a motor controller circuit for braking. When I was studying electrical engineering at Cal Poly Pomona, (back in the dark ages during the early 1980's), I had a couple of those motors for a motor speed controller circuit design in an independent study course. Electric motor controllers have come a long way since then...
George J. Becker
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Model railroading is fun but the work expands proportionately to the track gauge.

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Re: Koster powered trucks

Post by cp4449 » Wed Jul 25, 2018 3:04 pm

Are those the same motor that he put in the 4 wheel switcher?
C.P. Mahony
Former 1" Foreman
Los Angeles Live Steamers

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