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Old 24th November 2006, 10:16 AM   #1
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Default motor types head to head for a TT

Hi all,

I've tried to decide which kind of motor will I use with my turntable. The old one is an ac-motor and it's noisy. Which type of motor you prefer? (and why)

-AC
-DC
-Stepper motor

If you have built a controller for a stepper motor please share your thoughts.

The motor (+ controller) should have these functions: 33, 45, stop + fine tune speed control for a belt driven TT.

My TT is an old B&O 3000 modified with a 300mm diam x 20mm thick acrylic platter.

Thank you!
-Pete
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Old 24th November 2006, 12:08 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

I'd discard your third option immediately.

AC control is more straightforward.

DC control is more complicated,

/sreten.
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Old 24th November 2006, 01:16 PM   #3
torzsok is offline torzsok  Hungary
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Stepper motor is a valid option. Check this.

He uses a stepper motor with a dedicated wave generator (aka cdplayer) for both poles (or whaddahell should we call it since it's a unipolar stepper) and a special supply unit to provide the motor with enough throttle (aka stereo amp).

I have not tried but it is a rather tempting diy project.
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Old 24th November 2006, 02:08 PM   #4
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by torzsok
Stepper motor is a valid option. Check this.

He uses a stepper motor with a dedicated wave generator (aka cdplayer) for both poles (or whaddahell should we call it since it's a unipolar stepper) and a special supply unit to provide the motor with enough throttle (aka stereo amp).

I have not tried but it is a rather tempting diy project.
Hi,

Ok, but he is using it as a synchronous motor, /sreten.
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Old 24th November 2006, 02:16 PM   #5
torzsok is offline torzsok  Hungary
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Oops sorry, you're right, p_ete2003 most probably meant using steppers as steppers. One note at a time.
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Old 25th November 2006, 08:11 AM   #6
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actually, the altman's idea is one I've planned to try. That's the reason I have included the stepper motors in my list. I have plans to try it first with a mp3 player + amplifier and if it works the plan is to make a generator with sini wave + 90deg phase another one.

Anyone tried this yet?
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Old 25th November 2006, 08:53 AM   #7
Ghianni is offline Ghianni  Greece
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Quote:
My TT is an old B&O 3000
Is this the model type 5228 ?
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Old 26th November 2006, 10:37 AM   #8
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Hi Ghianni,

I'm not sure. I got this for free from a friend. Here's a picture.

Br,
Pete
Attached Images
File Type: jpg bo3000.jpg (40.8 KB, 443 views)
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Old 26th November 2006, 01:47 PM   #9
Ghianni is offline Ghianni  Greece
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Well, thats the type as I mentioned before (model type of 70s) , but the arm is not the original B&O and I believe that the pentulum suspension (floating chassis) has been modified also as well as the mechanism of the arm motion. This TT had a humming AC motor and a mechanical speed change control via a rubber wheel - pulley combination and a round belt. If you want to change the original AC motor, you can leave the mechanical speed change control and use a DC motor instead (may be a Maxon motor) as I have done.
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Old 26th November 2006, 03:13 PM   #10
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I've changed the SME there. The original arm was damaged.

The motor is in the original place but it is too noisy. Do you have any pics of your motor mod?
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