The recent threads suggest that maybe the way to segment this better might be in the following camps:
1) Strong coupling to platter and strong control of plater speed
The direct drives would fall into this camp. As would most belt drives that have strong connection to the platter.
I would think that either low or high mass platters can fall into this category with high mass being better.
Either low or high torque with higher torque being better when trying to control a high mass platter with belt.
Either DC or AC with speed stability playing the more important parameter independent of motor type.
I would also think platters with purpisely hgiher friction bearings or eddy-brakes would have to fall into this category.
2) Loose-coupling to platter, use of platter inertia to maintain stability
This would need to be a string-based drive with enough slippage. Obviosuly, direct drives would not be present since there is direct motor coupling to platter.
I would think you would need to use an AC motor or the like since it is a constant speed device and would not change spindel speed if there is slippage.
I'm not sure if torque would matter for an AC motor.
I think one would defintely need the high platter mass in this case to maximize platter inertia.
I would think that a more freely spinning, "friction-less" platter would be better than something that is helb back by a large bearing friction or eddy-brake. But then maybe a certain amount would be okay?
Anyway, would seem that the number of turntables in camp two is smaller. Forsell? Acoustic Signature? Platine? Custom units?
Andrew
1) Strong coupling to platter and strong control of plater speed
The direct drives would fall into this camp. As would most belt drives that have strong connection to the platter.
I would think that either low or high mass platters can fall into this category with high mass being better.
Either low or high torque with higher torque being better when trying to control a high mass platter with belt.
Either DC or AC with speed stability playing the more important parameter independent of motor type.
I would also think platters with purpisely hgiher friction bearings or eddy-brakes would have to fall into this category.
2) Loose-coupling to platter, use of platter inertia to maintain stability
This would need to be a string-based drive with enough slippage. Obviosuly, direct drives would not be present since there is direct motor coupling to platter.
I would think you would need to use an AC motor or the like since it is a constant speed device and would not change spindel speed if there is slippage.
I'm not sure if torque would matter for an AC motor.
I think one would defintely need the high platter mass in this case to maximize platter inertia.
I would think that a more freely spinning, "friction-less" platter would be better than something that is helb back by a large bearing friction or eddy-brake. But then maybe a certain amount would be okay?
Anyway, would seem that the number of turntables in camp two is smaller. Forsell? Acoustic Signature? Platine? Custom units?
Andrew