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Where can I buy mini, really slow, 3.3v to 12v motors? Answered

I'm looking for little motors that are about 15 - 20 rpm and that will run on 3.3v to 12v (5v would be great since I want to use usb for power). I've no idea where to start looking. Any help would be greatly appriciated. Thanks.

Tags:motor

Discussions

0
aliasjanedoe
aliasjanedoe

5 weeks ago

Thanks so much, you guys! I've ordered some from China, will find out in a month or so if they're any good. *fingers crossed*

0
Downunder35m
Downunder35m

5 weeks ago

Ok, since my mates here got overboard already I try the simple solution:
Have a look online for geared toy motors.
Some use tiny gearboxes, others a worm drive for even lower speeds.
If "littly" does not mean tiny you will have no problem finding a suitable motor.
Plus: The added gear reduction means you have only tiny power requirements for the motor.

0
Cheesey125
Cheesey125

5 weeks ago

I would recommend a normal dc motor with a resistor in series with it

1
Jack A Lopez
Jack A Lopez

5 weeks ago

Are there other constraints, besides size (little), input voltage (5 volt), and angular speed (15 - 20 rev/min)?

Guessing you want more than one, since you used the plural, "motors."

If you do not need unusual amounts of torque or power, then I think the cheapest, and best, solution will be a brushed, permanent magnet, DC motor, together with a gearbox, with plastic (nylon?) gears, for to reduce the motor's natural speed (tens of thousands of rev/min) to the speed you want.

One trick that seems to have several 'ibles written about it, is the old, "convert servo motor to continuous rotation" trick.

https://www.instructables.com/howto/convert+servo+...

The kind of servo motor being modified in those 'ibles, is the kind meant for steering a RC (radio controlled) toy car, or plane, or boat. Basically it is a shaft meant to be rotated to a particular angle, less than a full rotation (0 to 360 deg, or 0 to 2*pi radians). The trick to it, is removing the stops on the last gear, so that it can turn around, and around, and around... as long as the motor is energized.

Those 'ibles are worth looking at, just to see pictures of tiny DC motors, and tiny speed reducing gears that go with them.

It might also be possible to find a tiny motor, with gearbox, intended for continuous rotation, at the speeds you want, with the voltage input you want, without having to take anything apart and hack at it.

For example, I tried asking eBay's search bar, to show me "rpm dc gearmotor" with an additional constraint to show me those with "price + shippping: lowest first"

Here are just a few of what might be close to your spec.

https://www.ebay.com/itm/Micro-300-Slow-Decelerati...

https://www.ebay.com/itm/DC-5V-6V-30RPM-Slow-Speed...

https://www.ebay.com/itm/1PCS-DC3V-8V-19-51RPM-130...

These direct-from-China sellers usually have good prices, but the downside is unless you happen to live in China, it might take a month and a half, to ship it to you. Another downside, is the quality might be worse than you expected, although it is hard to tell, just from looking at the pictures, and reading the text descriptions.

I suppose there exists the possibility for pleasant surprizes, as well as unpleasant ones, when dealing with any eBay seller.