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turntable motor speed

I understand that an AC turntable motor uses the incoming line frequency of 60hz to set the motor speed, but how does a DC motor determine speed and how do you vary the speed to adjust for changes in platter or pulley size. Is the voltage changed and therefore the speed is controlled by the voltage or is there some other method at work. For instance, if I am running a 24vdc motor, would increasing the voltage to 25vdc cause the motor to run faster? Is it important to ensure that the voltage is exactly 24vdc, or is anything close acceptable?
manitunc

Showing 1 response by marakanetz

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marakanetz
5,473 posts
 
Increasing voltage will cause the DC motor run faster.
It's very important but nevertheless it's a large downside of DC motor that it depends on input voltage. The voltage stabilization circuits should be very precise.
There are motors that have quartz AC generators of a stable frequency.
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