I find this thread very interesting. I thought I would throw a monkey in the wrench so to speak. We know for a fact that for a certain amount of mass, a belt that has a specific amount of elasticity and proper torque to spin such mass, we can produce a specified speed according to the accuracy of the drive source, albeit; digital control speed controllers or DD quartz reference. The monkey is how much more accurate does a belt drive system become when you multiply the amount of motors with a specific torque factor to spin the platter? We must also account for the amount of belt elasticity and compute that into any formulas for an accurate answer.
I would like to use this example, my Transrotor has three motors with three belts to spin a fairly heavy 80MM platter. With one motor, it could be done, however, I did notice a lot slower start up and some belt slippage at start up. With 3 motors and 3 belts, the belt slippage at start up is minimized and the platter is spun up to speed fairly quick. The speed maintained fairly accurate readinds, but the belt wore out faster, Note, I do use a quartz controlled speed controller motor assembly that I check with the Clearaudio 300MHZ stroboscope for accuracy. From my experience, the belts over a period of time will wear out and the diminished amount of belt elasticity will cause the turntable to flucuate out of speed tolerance and will eventually need to be adjusted via the speed controller. The formula for torque is: T = r x F. The other formulas needed to find the rest of the story can be easily looked up. Basically, if we have three seperate effects of torque acting on a stationalry mass that becomes rotational, it is easier to transfer said torque or power if you want to convert to power and cause the movement of the mass than with one moment of torque. The caveat is if the initial amount of torque with one motor is the same as the same with 3 motors, most likely not for a turntable. If manufacturers published their torque specs for the seperate motor assemblies in either newton meter or torque specs we could calculate the amount of torque that is applied to the mass and see how that would effect our perfect 33.3 rotational speed.
The talk about the belt stretch vs. DD is going down the tubes so to speak, much good information about both types of drive systems, though, many hard core audiophiles. I would state that whatever you like, just like it, and not worry about anything else. Just listen to the music.
We can get down into the weeds of this, I have not seen anyone speak about the effect of rotational torque with additional motors vs one on a platter and how that would help speed consistency with a turntable. Their are so many ways and methods manufacturers are using to get to the means to the end, it is making my head spin.
V/r
Audioquest4life
I would like to use this example, my Transrotor has three motors with three belts to spin a fairly heavy 80MM platter. With one motor, it could be done, however, I did notice a lot slower start up and some belt slippage at start up. With 3 motors and 3 belts, the belt slippage at start up is minimized and the platter is spun up to speed fairly quick. The speed maintained fairly accurate readinds, but the belt wore out faster, Note, I do use a quartz controlled speed controller motor assembly that I check with the Clearaudio 300MHZ stroboscope for accuracy. From my experience, the belts over a period of time will wear out and the diminished amount of belt elasticity will cause the turntable to flucuate out of speed tolerance and will eventually need to be adjusted via the speed controller. The formula for torque is: T = r x F. The other formulas needed to find the rest of the story can be easily looked up. Basically, if we have three seperate effects of torque acting on a stationalry mass that becomes rotational, it is easier to transfer said torque or power if you want to convert to power and cause the movement of the mass than with one moment of torque. The caveat is if the initial amount of torque with one motor is the same as the same with 3 motors, most likely not for a turntable. If manufacturers published their torque specs for the seperate motor assemblies in either newton meter or torque specs we could calculate the amount of torque that is applied to the mass and see how that would effect our perfect 33.3 rotational speed.
The talk about the belt stretch vs. DD is going down the tubes so to speak, much good information about both types of drive systems, though, many hard core audiophiles. I would state that whatever you like, just like it, and not worry about anything else. Just listen to the music.
We can get down into the weeds of this, I have not seen anyone speak about the effect of rotational torque with additional motors vs one on a platter and how that would help speed consistency with a turntable. Their are so many ways and methods manufacturers are using to get to the means to the end, it is making my head spin.
V/r
Audioquest4life