Cheap but high torque, arduino compatible motor - Page 1
Forum section: electronics / projects

author: Sv443
author_rank: Newbie
timestamp: April 13, 2018, 06:16:15 am
content: So I've been working on an automated chicken coop door but I've ran into a big problem. At first I wanted to use a cheap Nema stepping motor but the torque was just too low to lift a 1kg weight. Do you have any suggestions on what motor I could use? Below 20$ and compatiple with 5V, 12V or 230V would be best.Thanks!

author: CM800
author_rank: Frequent Contributor
timestamp: April 13, 2018, 07:07:26 am
content: You could always add a gearing to it, or use a leadscrew to assist in gearing up the torque at expense of speed (I can't imagine you need a fast chicken coop door?)

author: Ian.M
author_rank: Super Contributor
timestamp: April 13, 2018, 07:43:27 am
content: Or add a counterweight. Use a cycle chain for the drive, with the motor and drive sprocket above the door, high enough there's space for the counterweight. Put the door on one end of the chain and put a weight to balance the door on the other end of the chain.

author: james_s
author_rank: Super Contributor
timestamp: April 13, 2018, 09:59:14 pm
content: Are there any automotive recyclers near you? Cars tend to be full of useful motors like this, wiper motors, power window and power sunroof motors, that sort of thing along with various mechanical bits. You can also find all the relays and connectors you need in order to interface the motor to your microcontroller.

author: amyk
author_rank: Super Contributor
timestamp: April 14, 2018, 03:49:54 am
content: Quote from: james_s on April 13, 2018, 09:59:14 pm...and starter motors, if you wantreallyhigh torque...

author: viperidae
author_rank: Frequent Contributor
timestamp: April 14, 2018, 05:03:26 am
content: "continuous rotation" servo.You can then control speed and direction with the Arduino servo library

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: April 14, 2018, 05:50:36 am
content: Maybe add a microswitch? Think of the chickens!!!

author: hagster
author_rank: Frequent Contributor
timestamp: April 14, 2018, 07:42:49 am
content: Maybe or maybe not the right motor for this job, but has anyone had experience with these cheap brushless motors with integrated controllers?. You can drive them directly from a Arduino apparently. No H bridge needed.http://m.dx.com/p/DetailMore?sku=440035&tabIndex=1

author: iwtommo
author_rank: Contributor
timestamp: April 16, 2018, 06:36:42 am
content: Just want to echo my support for starter motor powered chicken coop door

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 16, 2018, 07:38:58 am
content: Quote from: Sv443 on April 13, 2018, 06:16:15 amyou need to specify the rate of lift as well. with proper gearing, you can make your existing NEMA motor to lift a car, but until tomorrow. the rate of change and torque will both determine the power requirement of the motor. slower rate of change will increase torque and vice versa. if you dont want to use gears, then you'll need a big motor connected to the chicken door.looking at the video...you may buy a car power window motor for your purpose or something like this, gear ready so you dont need to make one...https://www.ebay.com.my/itm/12V-Reduction-Motor-Worm-Reversible-High-Torque-Turbo-Geared-Motor-2017-2-100RPM/142604920978?hash=item2133ea6892:m:mmTn81Wsj3NQhSW4CUkl6Xwassuming the motor is 1000rpm, the 10rpm gear version will give you 1000kg.cm or 10kg.m torque, but thats sound unrealistic for $6 china motor versionor this...https://www.ebay.com.my/itm/DC-Gear-Motor-12V-24V-30V-Strong-Torque-Positive-Inversion-Velocity-Regulating/183175230396?hash=item2aa61833bc:g:k68AAOSwMPxazyXR32kg.cm is plenty of torque @ 12V @ 4rpm maybe when loaded (9rpm unloaded)... fwiw...

author: Mr. Scram
author_rank: Super Contributor
timestamp: April 16, 2018, 08:39:04 am
content: Quote from: blueskull on April 13, 2018, 07:20:52 amThose parts look interesting, but sure aren't cheap. Then again, pay peanuts...

author: CM800
author_rank: Frequent Contributor
timestamp: April 16, 2018, 09:42:44 am
content: I would suggest doing a safety hitch (the door is lifted up, but can freely be lifted up without being motorized) otherwise you will have a fine gillotine dependent on how the mechanics are assembled.We did something similar with a sensor case made of stainless steel. The previous design could easily take a finger off as it was fixed to the actuator.

author: paulca
author_rank: Super Contributor
timestamp: April 16, 2018, 09:49:31 am
content: Have you considered a high torque servo?https://hobbyking.com/en_us/bms-617dmgplushs-v-fast-digital-buggy-servo-mg-6-8kg-10sec-46-5g.html

author: james_s
author_rank: Super Contributor
timestamp: April 16, 2018, 04:11:20 pm
content: The motor in that video is a power antenna, you don't see those too often anymore, my car has one and I always thought it was cool.