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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Re: Belt Creep. posted by JDK on February 2, 2006 at 22:37:51:
An increase in drag removes energy from the system as heat. That energy must be replaced for the system to maintain speed. The only source of energy is the motor, so the torque from the motor increases. That increased torque creates belt creep.The rotational kinetic energy stored in the platter can only be released by a change of speed, so its only effect is to reduce the rate of change of speed. Accordingly, a high moment of inertia will mean that the rate at which the platter slows down is reduced, so short term variations in torque requirement (eg modulation drag) will have less short term effect. Long term effects (like the difference in net stylus drag torque from the outside grooves to the inside) can only be minimally affected by rational values of moment of inertia.
A typical platter in a medium mass system has an Icm of about 0.2 kgm 2 , so a torque of 1mNm will cause a deceleration of .002 s 2 so we are talking of period of a few seconds for a speed change of less than 1%.
Mark Kelly
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- That's not correct. - Mark Kelly 02/3/0604:21:04 02/3/06 (0)
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