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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 kirkus

kirkus
502 posts
 
All DC motors used for such a purpose have a tachometer and feedback regulation circuit that controls the motor voltage. It's most commonly built right into the motor itself (just like a cassette-deck capstan motor) but occasionally you'll find it as a circuit external to the motor.

Simply regulating the value of the input voltage will not keep a DC motor at an exact speed.
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