My application requires a DC geared motor with torque of 10 NM - 20 NM and low speed (25 RPM at most) and a small dimensions (120 mm length at most). I failed to find my specs at eBay, and Alibaba targets only mass production. Can you recommend me certain models of Gear, Stepper or even Servo motors that met the above specs from any online store?
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3$\begingroup$ I'm voting to close this question as off-topic because it's a shopping recommendation. see robotics.stackexchange.com/help/on-topic $\endgroup$– N. StaubNov 24, 2017 at 11:34
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$\begingroup$ Welcome to Robotics Anas Albakri, but I'm afraid that shopping questions really aren't a good fit for a stack exchange site. We prefer practical, answerable questions based on actual problems that you face. Take a look at How to Ask and tour for more information on how stack exchange works, and the Robotics question checklist for details of how to write a good question. $\endgroup$– Mark BoothNov 29, 2017 at 11:19
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2 Answers
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You can find DC gearmotors on Amazon with roughly those specs.
This one, set with 30rpm and 24v, is fairly close: https://www.amazon.com/uxcell-Torque-Electric-Reduce-Turbine/dp/B072DTMPBC/ref=sr_1_5?s=hi&ie=UTF8&qid=1511799633&sr=1-5&keywords=dc%2Bgear%2Bmotor%2B25rpm&th=1
This one has higher RPM, but more power, and you can add an extra 2:1 gear reduction: https://www.amazon.com/dp/B01N8YDOC9/ref=sspa_dk_detail_2?psc=1
That's the smallest you'll find in fairly cheap motors. Otherwise, you'd need to custom order one, or talk with a manufacturer/supplier, which will probably be more expensive.
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If you want the motor to be short but don't care about the diameter, consider a pancake gear motor.
Ex: The AST 9AFG is less than 50mm long and has a version can deliver over 10NM at 21RPM. They have larger ones too
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$\begingroup$ Thanks for the very useful suggestion! Never heard about this type before. $\endgroup$ Nov 24, 2017 at 19:49