Guilty on the electronics engineer charge. At least I was until I retired a few years ago. I still dabble a bit and consult with former colleagues on occasional hobby questions. When I was working and had access to a lab with all the necessary equipment, this wouldn't have been as complex a task as it appears now.
I spent some time looking at the site where you found the motor you referenced. I also found a site where a lot of Sansui turntables were listed with some (usually not much) information about a lot of them. Here is a link: http://www.akdatabase.com/Sansui/Report1.pdf
The PE 350 from which the motor to which you linked came is listed as a linear tracking (like the LT-5V) automatic turntable from 1970. This makes me wonder a couple of things.
1. Since this is a linear tracker, is this the motor for the platter or for the arm tracking mechanism?
2. At that time, direct drive turntables were very popular. If this is the platter motor from a direct drive turntable, the motor would be geared down to the 33 1/3 and 45 rpm speeds which would make using it for a belt drive system difficult at best.
I tried to register on the Sansui-Parts site so I could question them about any information of this and other motors but I can't seem to log on (even after having them send my login information back to me in case I misspelled something). I sent them a request to get some Help on this but it probably won't be answered until Monday.
I also found the following site which has factory brochures for a lot (not all) of Sansui turntables which provides some information about them. http://www.classicsansui.net/images/Lit ... 2mk5_1.jpg
From this I found that the SR 222 MKV turntable was a belt drive servo system (like the LT-5V) so this is one for which I would definitely like to obtain spec's and wiring diagrams. If I can ever log onto the Sansui-Parts site, I will ask for them. This motor is also available on the Sansui-Parts site for 10 EU.http://www.sansui-parts-shop.com/index. ... 0&group=68
I also went through quite a few of the motors listed on the Sansui-Parts site. Some were synchronous AC motors (not applicable to your purpose), many were for direct drive turntables (again not applicable) and some clearly had only 2 wires (not servo motors and would require external control electronics). I'm still looking at these motors as I'm not done yet.
I looked at the diyhifisupply site. It appears that they sell parts that can be used to build a turntable. Presumably these are all compatible but I'm not sure on this. I tried to find information regarding the motor (Prima Tech) I found a site in the UK (conveniently) where a motor with the same part number seems to be available. I'm not sure if it is the same motor or not but even if it isn't, it might be applicable as it is a DC servo motor of the same size and with a speed range that might be appropriate. Here is a link to their site (McClennan).http://www.mclennan.co.uk/datasheets/eu ... motors.pdf
The physical size of the Prima Tech motor is almost the same as the LT-5V motor. I'm not sure about the electronics and how they are connected (I'm assuming that the electronic controller is for this motor). The downside of this is that by the time the motor and electronics are purchased the price tag is getting pretty steep (~100 EU). The upside is that it appears that it would be pretty much plug and play (with the possibility of needing to fabricate a bracket, perhaps making a custom pulley if their turntable drive flywheel is much different than the LT-5V flywheel in diameter which would take it out of the adjustment range, and purchasing their power supply as the current available from the LT-5V may not be 2 amps like their power supply provides).