DC motor type

IZHAKKATZ · 18th March 2009, 01:50 PM

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 · 22nd March 2009, 07:27 AM

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 · 22nd March 2009, 01:35 PM

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 · 6th April 2009, 11:09 AM

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 · 6th April 2009, 01:36 PM

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 · 7th April 2009, 09:29 AM

Hi Werner,

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

Regards,
Bins.

18th March 2009, 01:50 PM	#1
IZHAKKATZ diyAudio Member Join Date: Jul 2004 Location: Israel	DC motor type 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

6th April 2009, 01:36 PM	#5
Werner diyAudio Member Join Date: Jan 2002 Location: Belgium	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. __________________ bring back dynamic range

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22nd March 2009, 07:27 AM	#2
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	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.

22nd March 2009, 01:35 PM	#3
IZHAKKATZ diyAudio Member Join Date: Jul 2004 Location: Israel	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?

7th April 2009, 09:29 AM	#6
binspaul diyAudio Member Join Date: Feb 2009 Location: Cochin, Kerala, India	Hi Werner, What about the bipolar stepper motor idea suggested on the site: http://www.altmann.haan.de/turntable ? Regards, Bins.

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