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I am trying to find a motor to use to spin a cardboard wheel to drop balls through a hole. I want this to happen pretty slowly, around 10rpm. It also needs almost no torque, as it is spinning cardboard. However, when trying to find a motor, all I can find is extremely fast motors with low torque or slow motors with high torque. Both options are expensive. Does a very low cost, DC, low speed, low torque motor even exist? Thanks

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    \$\begingroup\$ Google gear motors.. They come in all shapes sizes speeds and costs. \$\endgroup\$ – Trevor_G Aug 31 '17 at 17:58
  • \$\begingroup\$ synchronous AC humidity drum motors or stepper motors and hobby servo motors can do this, otherwise you need servo feedback with rotary encoder. \$\endgroup\$ – Sunnyskyguy EE75 Aug 31 '17 at 17:59
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simple amazon search 10 seconds $4

https://www.amazon.ca/CNBTR-TYC-50-AC110V-Synchronous-Electric/dp/B01G8USUH0/ref=sr_1_2?ie=UTF8&qid=1504202443&sr=8-2&keywords=10+rpm+motor

enter image description here

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  • \$\begingroup\$ +1 Ya that's what came to my mind first too Tony. Don't know if he wants to run it at 100V AC though. \$\endgroup\$ – Trevor_G Aug 31 '17 at 18:08
  • \$\begingroup\$ Sounds like a Bingo machine with ping pong balls. Torque may increase on jams and Synch. AC motor can start in either direction if that matters. \$\endgroup\$ – Sunnyskyguy EE75 Aug 31 '17 at 18:14
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If you drive the wheel with a belt driven by a 2mm toy motor shaft turning at 5000 RPM you would need the pulley to be 100mm in diameter.

That sounds feasible. If you need the pulley to be bigger, put a small pulley on the motor. Easy to make if you have a small lathe, should be easy to make by sandwiching bits etc. if you don't.


If you're not in too much of a hurry you can get DC gear motors for << $10 from China like the below 12VDC 10RPM model with a convenient 6mm shaft.

enter image description here

This, like most gear motors, will have relatively high stall torque- it is 5.6 kg-cm rated.. if you need it to stall without damage you may need to limit the current.

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