Sing is an understatement! The motor is essentially a stepper motor that is being run with a 2 phase excitation. It is driven with 1000Hz, and whines pretty good... Fortunately it is in a thick aluminum case that is both air and water tight.
It is considerably quieter if you make sure the ball bearings are in good shape. -Chuck Harris J. Forster wrote:
HP made one with a sync motor running a Veeder Root counter. Something like a 115A. Runs off 100 KHz from their crystal oscillator. Neat unit. It does "sing" a bit. -John
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