Author Topic: Micro 10-30rpm motor suggestions?  (Read 4098 times)

Offline raynerd

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Micro 10-30rpm motor suggestions?
« on: March 30, 2016, 05:46:52 AM »
Hi guys, I'm looking for a motor for my current project but know very little about them and would appreciate your thoughts and suggestions.

I can run from mains voltage, so supply isn't too much of a consideration in that I could use a Dc power supply to run a 12v motor (which I expect it will be) or anything else.

The main factors are:
Slow rpm - 10-30rpm ish.
Run continuously for up to 1-2 hours.
Quiet... This is for a home display so it must be quiet!
Small - but I understand what is small? Ultimately this is going to be fitted under a circular base, approx 250mm diameter. Whatever the motor height is will raise the base. So the smaller the better to fit under a 25cm dial base.

Any help appreciated.
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Offline joshagrady

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Re: Micro 10-30rpm motor suggestions?
« Reply #1 on: March 30, 2016, 06:05:45 AM »
The datum you've forgotten is the torque required.  This is for the Orrery project, right? I need to check the measurements this evening, but I think I have one in the junk stuff for future projects crate that I could send you.

I'll get back to you this evening. 

Online DMIOM

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Re: Micro 10-30rpm motor suggestions?
« Reply #2 on: March 30, 2016, 07:30:51 AM »
Maybe a pancake stepper + cheap driver + 555 to allow speed control?   (pancake steppers can be < 1/2" thick).

Dave

Offline mattinker

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Re: Micro 10-30rpm motor suggestions?
« Reply #3 on: March 30, 2016, 08:28:57 AM »
How about an oven rotisserie motor?

Regards, Matthew.

Offline raynerd

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Re: Micro 10-30rpm motor suggestions?
« Reply #4 on: March 30, 2016, 10:07:53 AM »
The datum you've forgotten is the torque required.  This is for the Orrery project, right? I need to check the measurements this evening, but I think I have one in the junk stuff for future projects crate that I could send you.

I'll get back to you this evening.

Yes, it's a great point and I can't give you a figure. Yes it is for the orrery and with everything running on bearings it should take a very very light finger push to move it around. I'd definitely be interested.

Maybe a pancake stepper + cheap driver + 555 to allow speed control?   (pancake steppers can be < 1/2" thick).

Dave
Never heard of a pancake stepper but also sounds a plan. Would it be noisy?
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Offline raynerd

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Re: Micro 10-30rpm motor suggestions?
« Reply #5 on: March 30, 2016, 10:09:45 AM »
How about an oven rotisserie motor?

Regards, Matthew.
Quite a few on eBay mention they could be used as such. I just wonder how noisy they are
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Offline awemawson

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Re: Micro 10-30rpm motor suggestions?
« Reply #6 on: March 30, 2016, 10:18:08 AM »

Never heard of a pancake stepper but also sounds a plan. Would it be noisy?
[/quote]

Only if you make a mess squeezing the lemons, or drop the sugar sprinkler   :lol:


http://uk.farnell.com/sanyo-denki-sanmotion/ss2421-5041/42mm-slim-pancake-stepper-motor/dp/1708572?CMP=KNC-GUK-GEN-SHOPPING-SANYO_DENKI_SANMOTION&CAGPSPN=pla&gross_price=true&gclid=CPmW_5fN6MsCFUa4Gwodl9kMEQ&mckv=fZWTkCpX_dc|pcrid|78108445869|&CAWELAID=120173390000291874
Andrew Mawson
East Sussex

Offline mattinker

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Re: Micro 10-30rpm motor suggestions?
« Reply #7 on: March 30, 2016, 10:27:36 AM »
How about an oven rotisserie motor?

Regards, Matthew.
Quite a few on eBay mention they could be used as such. I just wonder how noisy they are
The ones I've seen are very quiet, but I couldn't garunte that.

Regards, Matthew

Offline raynerd

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Re: Micro 10-30rpm motor suggestions?
« Reply #8 on: March 30, 2016, 10:31:05 AM »

Only if you make a mess squeezing the lemons, or drop the sugar sprinkler   :lol:


http://uk.farnell.com/sanyo-denki-sanmotion/ss2421-5041/42mm-slim-pancake-stepper-motor/dp/1708572?CMP=KNC-GUK-GEN-SHOPPING-SANYO_DENKI_SANMOTION&CAGPSPN=pla&gross_price=true&gclid=CPmW_5fN6MsCFUa4Gwodl9kMEQ&mckv=fZWTkCpX_dc|pcrid|78108445869|&CAWELAID=120173390000291874

Ho Ho Ho  :doh:

Thanks for the link Andrew, quite pricey but looks the job. I just looked on eBay and they are 80 there!
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Offline chipenter

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Re: Micro 10-30rpm motor suggestions?
« Reply #9 on: March 30, 2016, 02:35:43 PM »
Phase moters are realy quiet and small . the ones from central heating valves come with there own gears .
Jeff

Offline JonIndigoman

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Re: Micro 10-30rpm motor suggestions?
« Reply #10 on: March 30, 2016, 03:05:03 PM »
How about a microwave plate motor. I'm not sure but I think they are about 5 rpm which may be a bit slow but you may be able to gear it up. I find they are generally free as round this way they are  left by the the roadside for the scrap man.

Worth experimenting if the cost is zero.

Jon

Offline sparky961

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Re: Micro 10-30rpm motor suggestions?
« Reply #11 on: March 30, 2016, 04:16:14 PM »
Maybe a bit Rube Goldberg, but likely quieter than any stepper...

Take virtually any small DC motor and gear it way down using pulleys that fit O-rings, or timing belts if that works better.  Have one or more indexing pulses on your disc or whatever that are connected to a simple microcontroller (these have now become ubiquitously referred to as "Arduino" noweadays, regardless of what silicon is behind the system).  Use very simple PID to control the motor RPM.  There may be some discrete circuit that would work, but with high powered silicon being virtually throw-away there's not much point to look elsewhere.

he RPM pickup could be as simple as a light-interrupting laser-printed encoder wheel or something you've drilled equally on a rotary table setup.  Sounds complicated, I know, but the cost would likely be less than the stuff you've been looking at.  I guess it depends how tightly controlled you need the RPMs as well.  Maybe it would be sufficient to just run it at a fixed voltage you've determined makes the output the speed you want.

Offline nrml

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Re: Micro 10-30rpm motor suggestions?
« Reply #12 on: March 30, 2016, 04:37:57 PM »

Only if you make a mess squeezing the lemons, or drop the sugar sprinkler   :lol:


http://uk.farnell.com/sanyo-denki-sanmotion/ss2421-5041/42mm-slim-pancake-stepper-motor/dp/1708572?CMP=KNC-GUK-GEN-SHOPPING-SANYO_DENKI_SANMOTION&CAGPSPN=pla&gross_price=true&gclid=CPmW_5fN6MsCFUa4Gwodl9kMEQ&mckv=fZWTkCpX_dc|pcrid|78108445869|&CAWELAID=120173390000291874

Ho Ho Ho  :doh:

Thanks for the link Andrew, quite pricey but looks the job. I just looked on eBay and they are 80 there!

How about one of these? They cost less than what you pay for a pint in a lot of pubs these days. It should run well on a dirt cheap allegro driver. Only downside is that there is no mention of the torque it produces. http://www.ebay.co.uk/itm/1pcs-Shinano-35MM-stepper-motor-1-8-Two-phase-four-wire-Stepper-motor-/111841354383?hash=item1a0a43a28f:g:T1YAAOSwWTRW2F2A

Offline kayzed1

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Offline millwright

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Re: Micro 10-30rpm motor suggestions?
« Reply #14 on: March 31, 2016, 04:57:06 PM »
Chris  i have sitting on my desk here a 240v synchronous motor 5rpm but could easily be geared to suit. if you think it may be of use PM with an address and ill post it to you, no charge.

John




Offline Beone

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Re: Micro 10-30rpm motor suggestions?
« Reply #15 on: March 31, 2016, 05:36:09 PM »
Try Micro Mark
Dave

Offline kayzed1

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Re: Micro 10-30rpm motor suggestions?
« Reply #16 on: March 31, 2016, 07:49:10 PM »
You should be able to get one from any plumbers merchants, they are used in heating diverter  valves.. 2 or 3
Lyn.

Offline drmico60

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Re: Micro 10-30rpm motor suggestions?
« Reply #17 on: April 01, 2016, 05:41:00 AM »
Hi guys, I'm looking for a motor for my current project but know very little about them and would appreciate your thoughts and suggestions.

I can run from mains voltage, so supply isn't too much of a consideration in that I could use a Dc power supply to run a 12v motor (which I expect it will be) or anything else.

The main factors are:
Slow rpm - 10-30rpm ish.
Run continuously for up to 1-2 hours.
Quiet... This is for a home display so it must be quiet!
Small - but I understand what is small? Ultimately this is going to be fitted under a circular base, approx 250mm diameter. Whatever the motor height is will raise the base. So the smaller the better to fit under a 25cm dial base.

Any help appreciated.

Have a look at microwave oven turntable motors. These are thin (circa 12-15 mm) and run at the right sort of speed range.

Mike

Offline Baron

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Re: Micro 10-30rpm motor suggestions?
« Reply #18 on: April 01, 2016, 12:44:34 PM »
Hi raynerd,

Have a look at an old 5.25 inch floppy drive spindle motor, or even a 3.5 inch one.  The motors have the controller built in, I'm sure that they can be controlled digitally.  They are pancake type motors and are around 1/2" thick.

HTH.
Best Regards:
                     Baron