Saturday, September 06, 2014
Here's a puzzle for you. Can anyone tell me anything about this motor?
Bought for £1 out of curiosity, it runs very smoothly on 12V DC but would (according to the markings on the end) be happy on 24V. It's very well made with screws over the brushes to allow for adjustment and replacement. I think you can adjust the end float by turning the lump with two holes in at at the back of the shaft. This is painted with a clear glaze, presumably to fix it.
The biggest oddity is that there are pairs of wires to each polarity - red/blue and yellow/black. These are twisted together so I assume they do the same things but why would you want to feed the motor from two places?
Length over shaft - 75mm
Width over the flat sides - 40mm
Height - 46mm
Shaft diameter - 3mm (it appears hollow too)
A plate on the end says Type CM3. The motor is No. 051207
The seller suggested this might have RAF origins but knew no more.
Posted by Phil Parker at 5:30 AM