Oooh - poles apartThe biggest single difference between different electric motors is how well they are made.
Once you get to a quality motor with good bearings, lots of wire in the windings, balance, magnets etc. a three pole motor will usually run faster than a multi pole motor - because there are less electrical changes in the armature. It may however start and run less smoothly.
A multi pole motor has to have smaller windings on each pole - otherwise the motor would need to grow in size considerably - this tends to limit the torque to about the same whatever the number of poles.
Power is torque x speed. Torque remains fairly consistant and a three pole motor can run faster - more power.
On to all this you add gears and drive wheels - all of which can make a huge difference to the overall performance. As a three pole motor may be running faster, it needs lower gearing for our use - which increases power - again.
But, at the end of the day, quality will out perform poles.
Yeah, well, that's what started me off - I usually go for a 5-pole motor - although I do have one loco with a Buhler 7-pole motor, but with its 50:1 gearing, it's difficult to really pick up how smooth it isMulti pole motors tend to start and run better. We often run our motors quite slowly - a multi pole motor is probably smoother.
Sensible conversion Paul, double buffers unless they are oversize will not work that well through many of your points as you have found out. I would think R3 minimum and then not on a crossover but to a Siding that has a good straight length before any curve. On my 0 Gauge Standard Gauge Light Railway I had to incorporate a bit of straight on the 2’6” Crossovers and with the Bogie Coach have Elongated oblong buffers to stop locking.Due to operational difficulties (buffer lock when shunting) I decided to change the outside buffers and coupling hooks. I wasn’t overly keen on the single combined coupler and hook. I opted for the multiple height coupler which I think suits the locomotives rather well. The side safety chins also serve to disguise the original side buffer holes.
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