In article ,
Ian White wrote:
Please can anyone help me find one of these? It looks similar to
http://tinyurl.com/3xykj3 but maybe with a deeper stack of stator
laminations.

* It must be 2500rpm nominal (it's to replace a 1250rpm motor)
* The shaft needs to be 0.25in diameter (not 6mm) and about 2in
long.

2-pole shaded pole motors are readily available,
but only with a 6mm shaft these days.

To get a 0.25" shaft might mean looking in old electrical
equipment.

AIUI there is no way to modify the existing 1250rpm motor,
because the speed is determined by the number of 'poles' in the
rotor construction.

Many (many) years ago there was a way of getting a 2:1
speed switch with 4-pole motors which had a coil on
every pole.

For 1500 rpm (off load) the coils were energised in a
N-S-N-S 4-pole configuration and for 3000 rpm (off load)
the coils were switched to a N+N-S+S configuration, to
get an effective 2-pole motor.

Any chance with your present motor?

Notice the 'off load' distinction. These shaded pole
motors do run with a large slip on load, and your
'1250 rpm' 4-pole motor is really a theoretical 1500 rpm
sync speed motor running at 17% slip.

--
Tony Williams.