DC motor type

[IZHAKKATZ]

Hi All,

Please advice and explain best type of DC motor to use in a TT:

Precious metal brushes
Graphic brushes
Coreless, and if so how many poles

thnks
IK

 

[dangus]

This is speculation, but it just occurred to me that a DC servo motor like those used in old-fashioned computer tape drives might work. Some of them come with a tachometer attached, so you could close the loop with feedback. The ones I'm thinking of are bigger than fist-sized. However, a much smaller servomotor like out of a daisy-wheel printer would be a saner (and cheaper) choice if you don't need enough torque to slip-cue or cut acetates.

 

[IZHAKKATZ]

Thanks Dangus,

The reason I’m asking is because graphite brushes and
coreless motors cost much less.
For graphic brushes I would thing the same power supply as precious metal would work but what kind of supply do you need for coreless?
And which would give best results?

 

[binspaul]

Hi,

Is it possible to use a bipolar stepper motor as a turntable motor ? (Please see the attached specification sheet). If possible, then which one of the 3 is the best option ?


Regards,
Bins.

 

[Werner]

The best?

probably BLDC with 3-fase sine drive.

A bit expensive and complex.

Second best, as used by Michell, Origin Live, Teres, ...

Coreless DC with precious metal brushes and sleeve bearings.
Maxon and Premotec have such things.

Easy to drive: a low-current variable voltage source.

Tacho feedback or armature current feedback are optional.

 

[binspaul]

Hi Werner,

What about the bipolar stepper motor idea suggested on the site: http://www.altmann.haan.de/turntable ?

Regards,
Bins.