sansui sr525 motor question

[mlaidman]

Hi folks,
I stumbled across this site just a few minutes ago and it seems to have a lot of valuale information.
As the topic says, I've got an old Sansui sr525 that's unusable, so it's been taken apart. I'd like to use the motor for another application - driving a camera dolly slowly down tracks for timelapse photography. I know there are better solutions, but I'd like to pursue it a bit more.
Anyway, when fully disassembled and with no load the spindle spins very inconsistently - taking 3/4 "jerky" movements to complete a rotation. Is the weightplate necessary to achieve smooth rotation? Acting like a flywheel? The motor is smooth otherwise.
Also, is there a way to power these things by battery? They'd both be DC, so maybe it's possible if I can up the voltage to 120ish...
Any thoughts?......thanks all!

[rhomanski]

Some of the direct drives have a metal plate over the motor that is an integral part of the motor. When removed the motor acts as you describe. On some it can permanently damage the motor to operate it with that plate removed.

Regards,

Ron.

[mlaidman]

Thanks for the reply.
I think the motor might be a stepper motor, and the turntable acted like a weightplate and kept it spinning smoothly.
Regardless, I don't think I can get it to spin smoothly without that kind of weight on top.
That and the fact that if it's oriented in any way either than how it would be when playing records (flat and level) it rubs on the inside...so I think it's pretty limited in its use for other applications.
Thanks for the info though!

[Mr.T]

This might be fate, but I just signed on here to find out what to do about a burned-out motor for a Sansui SR-525. Let me know if you want to unload it, I was about to order one from Germany but I'd rather ship from Canada! Shipping was going to kill me on it. I think I was going to pay 8 pounds for the motor, whatever that is. Let me know

Mr. T