Find DC Motor for Turntable with Built-In Brake Mechanism

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A user is seeking a 12v DC motor with a built-in brake mechanism for a turntable, emphasizing the need for it to resist manual movement until powered. Discussion highlights the challenges of controlling motor speed to prevent audio distortion, suggesting the use of a speed disc for better accuracy. Another participant recommends a geared motor with high torque to achieve the desired functionality. The context involves creating a motorized satellite dish, where the user has already implemented a worm drive motor for movement but struggles with the turntable's rotation. Overall, the focus is on finding a suitable motor that meets specific operational requirements.
maximus999
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Hi all,
I came across this forum and feel as though someone can point me in the right direction.

I am looking for a 12v DC motor to power a turntable, I have a speed controller to slow the motor down. I need to know if there is a DC motor available to buy which can't be turned by hand, a sort of a brake mechanism built in and can only move when a current is put through it.

Thanks for any replies.

Ian
 
Engineering news on Phys.org
If you short the two leads of a permanent magnet brush-type dc permanent magnet motor when it is off, it feels like the rotor is in a viscus fluid. Adequately controlling the motor speed with feedback to eliminate wow and flutter for listening to music is very difficult. You might need to have a speed disc permanently mounted on the underside of the platter.
 
Hi,
thanks for the reply, the turntable i am making is for a motorized satellite dish. I have managed to use a worm drive motor for the forward and backward motion of the dish and I am struggling with the turning of it i.e 360.

The motors which i am using move when a little force is applied and i would like to stop the movement
 
I suggest you use a geared motor with high torque.
 
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