motor types head to head for a TT

p_ete2003 · 24th November 2006, 10:16 AM

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

sreten · 24th November 2006, 12:08 PM

Hi,

I'd discard your third option immediately.

AC control is more straightforward.

DC control is more complicated,

/sreten.

torzsok · 24th November 2006, 01:16 PM

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.

sreten · 24th November 2006, 02:08 PM

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.

torzsok · 24th November 2006, 02:16 PM

Oops sorry, you're right, p_ete2003 most probably meant using steppers as steppers. One note at a time.

p_ete2003 · 25th November 2006, 08:11 AM

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?

Ghianni · 25th November 2006, 08:53 AM

Quote:

My TT is an old B&O 3000

Is this the model type 5228 ?

p_ete2003 · 26th November 2006, 10:37 AM

Hi Ghianni,

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

Br,
Pete

Ghianni · 26th November 2006, 01:47 PM

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.

p_ete2003 · 26th November 2006, 03:13 PM

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?

24th November 2006, 10:16 AM	#1
p_ete2003 diyAudio Member Join Date: Nov 2003 Location: Helsinki	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 __________________ LIM

25th November 2006, 08:11 AM	#6
p_ete2003 diyAudio Member Join Date: Nov 2003 Location: Helsinki	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? __________________ LIM

26th November 2006, 03:13 PM	#10
p_ete2003 diyAudio Member Join Date: Nov 2003 Location: Helsinki	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? __________________ LIM

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24th November 2006, 12:08 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, I'd discard your third option immediately. AC control is more straightforward. DC control is more complicated, /sreten.

24th November 2006, 01:16 PM	#3
torzsok diyAudio Member Join Date: Apr 2005 Location: Budapest	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.

24th November 2006, 02:16 PM	#5
torzsok diyAudio Member Join Date: Apr 2005 Location: Budapest	Oops sorry, you're right, p_ete2003 most probably meant using steppers as steppers. One note at a time.

26th November 2006, 01:47 PM	#9
Ghianni diyAudio Member Join Date: Sep 2005	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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