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Bbdd
TheRealBadger
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I've just given that a go and it doesn't spin at all.
Is this out of a non-USA blender? If yout plug it into 110 it should run at half speed. You could also get an AC to AC adapter (most are AC to DC). I know some of the old HP JetDirects used a 9v AC adapter. If not you could probably control it with some kind a dimmer switch/knob, but I wouldn't leave it unattended 9which is probably the point). This thing probably has way more power than what you need.
There's several kinds out there, many you can build yourself. You're going to have to read up on it. I'm guessing that motor needs a specific voltage and current, so there's not much you can do there. Some motors can be controlled by varying the applied voltage and current. Others other varied by the driving frequency. So your mains are at 50 Hz, which cause it to go a billion RPM, but if you dropped down to say.... 10 Hz? it'd go 1/5 billion RPM :P.
You'd need to figure out what works for your motor. Based on what you wrote, I think it's an AC induction motor, so the frequency varying method is probably best. Here's a good starting point, courtesty Wikipedia:
http://en.wikipedia.org/wiki/Motor_controller#Speed_controls_for_AC_induction_motors
Try Google for 'single phase AC induction motor control circuit'
Found this: http://www.aaroncake.net/circuits/acmotcon.asp