My wife Karen asked me to look at your posting. I do not know the
horsepower of your motor in question but if it is a fractional
horsepower motor, you might replace it with a blower motor from a
discarded furnace or other source. I doubt you will find a
manufacturer that would help you in any way as your motor sounds like
it is used instead of new and therefore a problem for them to sell.
I suggest you contact and electrical recycling company in your area
and try to trade it in for possibly two motors that are single phase
as three phase motors are more saleable for commercial/industrial
applications and garner a higher price.
Remember to keep to the same RPM (Revolutions per minute) or you
will have to change pulley size to maintain the same performance with
your machine application.
Differences in 208, 220, 230, or 240 volts are not a problem and
will subsequently vary your full load current by the same percentage
as the voltage difference.
The frame size on your present motor should be the same as the motor
you end up with or you may have to modify the mounting and/or the
pulley shaft diameter.
Dan Bahr, Master Electrician for Machineworx