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High quality AC turntable motor

I am looking for a high grade AC motor for my Townshend Elite Rock turntable.
The current motor is specified to run at 110v 250rpm. I reckon that it's got very little torque. I have considered the phillips and the premotec - but they appear to offer no real alternative so far as specs are concerned with what I have.

I have seen a couple of motors on the RS Online website by the likes of Berger, and Crouzet. The Crouzet motor intrigues due to it's high torque rating. my concern is whether or not it is noisy, and vibrates a lot.

Does anyone have experience with these motors? or does anyone have any suitable suggestions?

I intend to try out a few different power supplies on the deck at some point.
lohanimal
bpoletti
1,552 posts
 
It would also seem that the manufacturer has taken phase into consideration in the manufacturer of the motor. If it runs from a wall socket, then it should be a matter of adjusting the voltage and alternating speed.
audioquest4life
771 posts
 
Hi all,

I am reading this thread with interest. The technical knowledge of some here, amazes me.

Having upgraded my turntable system to a three motor controller:
http://www.axissaudio.com/turntables/KM3.htm

In this German webpage, they discuss another turntable controller with amazing results. Seems like a real bargain compared to other controllers. http://www.frank-landmesser.de/hoer_analog_netzteil.html

I am very happy with the speed accuracy of this type of motor controller.

Still settling into our new house after our move back to the US from a lengthy tour of Europe.

Ciao,
Audioquest4life
john_tracy
341 posts
 
Bpoletti, turntables that use AC are of the synchronous variety. Their speed is determined by the frequency of the AC, not it's voltage. The way AC line voltage bounces around a motor that depended on it for speed regulation would do a lousy job. See: http://en.wikipedia.org/wiki/Synchronous_motor
All this talk about phase has to do with reducing motor vibration, not speed regulation per say. Vibration can add a form of frequency modulated distortion, a form of analog "jitter" if you will.
lewm
13,038 posts
 
What John wrote of the Notts controller is also largely true of the other best known tt controllers, namely that they do not do true phase splitting. Yet there are obvious benefits nevertheless. I am on the wait list for mark Kelly's controller, which will also do phase splitting, a la the KK one.
bpoletti
1,552 posts
 
By lowering the voltage on an AC synchronous motor, the "pulsing" is not as strong allowing the inertia of the platter to better smooth the jitter. That's why the VPI SDS is so effective. It uses full voltage to help get the platter moving, then drops the voltage significantly after a few seconds.
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