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Old 16th July 2002, 01:59 PM   #11
dice45 is offline dice45  Germany
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Eric,

the motor i ordered is th maxon REmax29 with 24Volt and a 3mm shaft.
Pulley diameter is 10mm. The belt surface will be curved and i intend to grind the pulley on the shaft to final diameter in order to cancel excentricity.

The belt runs over the platter's outer diameter, 310mm in my case.
The motor has full speed at about 6000 rpm but for 33 it will run @ 1033 rpm.
Speed ot 120 is intended platter speed limit.

The motor will sit on a ball-beared sled so that belt tension can be easily controlled via a spring or whatever.
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Bernhard
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Old 16th July 2002, 03:37 PM   #12
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Thanks Bernard.

Regards, Eric.
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Old 19th July 2002, 07:29 AM   #13
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Dice45, mrfeedback,

I am very keen on a DIY motor upgrade for my project.

I think I can source Maxons on Australia, but where do I start in designing a controller for the motor? I would only need 33 and 45 rpm.

I am a Mech engineer, not an Elec engineer, so any guidance would be appreciated.
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Old 19th July 2002, 05:23 PM   #14
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Hi rookster,
I think Bernard recomends an LM317 based variable regulator for the motor drive.
With a good quality DC motor this would be entirely adequate.
If using a vcr capstan motor a stable 12v supply plus a precise speed control voltage is required.

Regards, Eric.
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Old 20th July 2002, 09:20 AM   #15
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Default Motor contoler schematic

Dice45,

can you suggest a simple schematic based on the above info from mrfeedback. I am imagining a transformer, followed by a rectifier, followed by some filtering, followed by a fixed voltage reg, followed by an LM317 to give speed selection. This will then feed a Maxxon motor. Does this sound okay? Or is a battery supply better?

mrfeedback,

Thankyou for your input. Did you get my e-mail reply to your e-mail the other day?
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Old 22nd July 2002, 12:02 AM   #16
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Default Free Motors

Hi Rookster,
Yes I did get your email.
Phone calls are cheap - give me a call and I can talk you through it, and tell you how to do this very cheaply.

Regards, Eric.
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