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I see that some have used synchronous ac motors and used variable frequency supplies to drive these with success. Also DC or Dc servo like yours Malcolm seem to be my preferred choice. I have heaps of stepper motors around the place and even have a microstep stepper controller I should put into use, but need to find a suitable reduction gearbox for this. One of the hassles of the steppers I have is they are quite substantial motors that need a bit of current to drive, so a small battery pack isn't suitable. Another thought of mine, but nothing much else to back it up with no experience, I like the idea of using 2 motors, one on each side to drive the platform. Saw this idea on Cloudy Nights under the subject of an EQ platform for $30.
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