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RE: I'll bet...

"The motor is a 12-watt brush-less DC motor operating from 24-VAC 3-phase sinusoidal power, which eliminates cogging completely. It has approximately twice the torque of a 10-watt Hurst AC synchronous motor and its RPM is governed by frequency. The Condor controller has a soft start function that ramps up frequency to full speed in about 2-seconds. As a result, there is absolutely no noise at startup and also no noise when running at full speed. After reaching full speed the Condor reduces voltage slightly for quieter operation, if that's even possible since it's totally silent to begin with. I get stable readings from the RoadRunner in about 12-seconds after startup, but I think the RoadRunner takes about that long to stabilize as a result of its averaging algorithm. This 3-phase system is designed to operate turntables with massive platters and it works exceptionally well with my Sota Millennia Vacuum turntable."
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I presume that it is the motor controller that locks onto the power frequency. DC motors tend to be voltage dependent. Other words, in a DC motor, more DC volts equals more rpm and fewer DC volts means fewer rpm. In the essence of all this a motor controller for a DC motor could be as simple as a voltage regulator.

I'm not at all certain how AC 3-phase power and DC ouput come together on this. (except through an AC to DC conversion within the power supply) but I'll be happy to leave those details to its designer who has already proven himself highly competent in power supplies and motor speed regulation. Ergo, I take it on faith in its designer.

In any case it sounds as though that setup would have worked very well on a Teres.
thanks for this info John. Very interesting stuff.
-Steve


Edits: 01/15/17 01/15/17
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