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In Reply to: Can DC TT motors be run on battery power? posted by violinist3 on May 9, 2007 at 00:14:56:
.. so it would run too fast at 25 volts, and a little slow at 23 volts. Hence the PSU to feed it the exact voltage it needs to spin the platter at 33 1/3.My comments are based on generalities, and not one first-hand experience with the Gyro SE motor, so I hope sombody will correct me if I'm wrong.
Follow Ups:
Speed is inversely proportional to the voltage for a DC motor. So it would run faster at a lower voltage, slower at a higher voltage.The biggest problem would be if the voltage goes to zero. I used to be able to demonstrate that effect on my old Kenwood TT. The 33/45 switch had a disconnect if you held the button 1/2 way down. The platter speed would accelerate for a long time.
I remember an AC/DC machines lab in college. The professor warned us we would get an automatic F if we ever connected the armature voltage before the field voltage to a DC motor. Theoretically, the speed would go to infinity.
Jeff TOJ
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bring bac k dynamic range
That's right so if you used a battery you would also have to build a voltage regulator circuit to keep the voltage constant at 24V.
Why make it complicated?
or speed will vary... especially if any flunctuations with battery voltage.
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