Find DC Motor for Turntable with Built-In Brake Mechanism

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Discussion Overview

The discussion revolves around finding a suitable 12v DC motor for a turntable that includes a built-in brake mechanism, preventing manual rotation unless powered. Participants explore options for motor types and control mechanisms suitable for this application.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Ian seeks a DC motor that cannot be turned by hand and has a built-in brake mechanism, only allowing movement when current is applied.
  • One participant notes that shorting the leads of a permanent magnet brush-type DC motor creates resistance, likening it to a viscous fluid, which may complicate speed control for audio applications.
  • Ian clarifies that the turntable is intended for a motorized satellite dish, indicating a need for a motor that can stop movement effectively.
  • Another participant suggests using a geared motor with high torque to achieve the desired control over the turntable's movement.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specific type of motor to use, and multiple suggestions and concerns about motor behavior remain unresolved.

Contextual Notes

There are limitations regarding the specific requirements for torque and braking mechanisms, as well as the implications of motor types on speed control and manual resistance.

Who May Find This Useful

This discussion may be useful for individuals interested in motor selection for robotics, audio equipment, or similar mechanical applications requiring precise control and resistance to manual movement.

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
 
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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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