High quality AC turntable motor

Palasr, You are correct; the Walker MC is likely to be pretty much like the SDS. This is what I was referring to in my previous post "most" current commercial controllers do not actually split the phase of the AC.

I am awaiting delivery, as I mentioned, of Mark's second generation controller. It's a finished product, not a kit.

Lewm, can you let me know how I can potentially obtain one of these second generation controllers? Are they currently available? Feel free to message me if that seems more appropriate than posting publicly.

Googling has yielded little for me in my search for one of these.

Hi Lewm, I also would like to know how to acquire Mark Kelly's second generation AC motor controller.

If the controller does not split phase (relies on a capacitor in the motor to split phase), then I would expect that one is better off moving the belt on a pulley rather than electrically switching speed.

The motor controller for the Basis turntable does properly split phase in the controller, sending two separate power lines to the motor. The motor has to be modified in order to use the controller (one cannot just plug the motor into the speed controller).

Dear Larry, I think those are two different things (splitting phase, which is an advantage for an AC synchronous motor controller, vs electrically switching speed, which can be done by either controlling voltage or AC frequency or both, depending upon the type of motor). The only issue would be for an induction motor where there is kind of a plateau for voltage, below which the torque falls to zilch. Please anyone correct me if I'm wrong in this; motors are a complex subject that I hardly can claim to study on a daily basis. I am going on my fading memory of Mark Kelly's teachings.

Also, it's not "two separate power lines" strictly speaking. It's taking the sinusoidal AC wave form and generating a second one that is 90 degrees away from the first, so the motor is driven in quadrature. As I understand it, the more perfectly that is achieved, the smoother the motor will run. That's what a capacitor tries to do but does not do nearly as well.

Roscoeii and Redglobe, perhaps you can contact me by email. I cannot seem to find your respective email addresses. Let me know if you cannot find mine. I may be able to help, in any case.