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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: not a "robust motor" posted by Bruce from DC on April 29, 2007 at 13:28:53:
The synchronous motor will not change speed at all due to stylus drag, it is locked to synchrony with the supply frequency. At 60.00 Hz it's doing 300.0 rpm, at 60.04 Hz it's doing 300.2 rpm.The measured speed change is due to belt creep. For the belt to transmit torque it must stretch and the stretch must recover as it goes around the pulley. The stretch recovery means the belt moves slower than the pulley - this is called belt creep. The amount of stretch varies with the load on the belt so belt creep increases with stylus drag.
Your figure of 0.067% (not 0.0167%) or 667 ppm corresponds neatly to my theoretical calculation of 750 ppm, within the limited precision of the SDS (one step = 167 ppm)
Mark Kelly
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Follow Ups
- Not the motor at all - Mark Kelly 04/29/0716:03:03 04/29/07 (2)
- Just so you know ... - MaxwellP 16:09:11 04/29/07 (1)
- If you use I x R compensation - Mark Kelly 17:12:17 04/29/07 (0)
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