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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 synchronous, nor high torque. posted by empirelvr on February 11, 2010 at 16:37:25:
Please measure the speed of your Empire motor.You can do this by measuring the platter speed and muliplying by (platter diameter + belt thickness) / (pulley diameter + belt thickness).
I've looked again at the data upon which I based these measurements and it seems that a small difference in accuracy would support a different interpretation: that the motor is indeed synchronous up to a torque of about 7 mNm and then begins to slip.
I don't think I made a 2-3% error in my measurements but it's possible. These measurements were made with the Papst driving a DC motor acting as a generator and measuring the output voltage.
I can think of two methods which would be more accurate: One, using an AC synch motor as a generator and measuring the output frequency and Two, linking a strobe to one of my frequency generators and finding the frequency at which the strobe locks the rotation of the motor. I might get a chance to do one or both of those next week.
Mark Kelly
Edits: 02/11/10 02/11/10
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- I might be wrong - measurements required - Mark Kelly 21:47:54 02/11/10 (0)
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