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Best motor type for a lightweight winch
liquidwad
Member
03-07-2016 11:08 AM
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Hi,
I am building a winch for a drone and my first attempt at making one did not work out very well.
I used a microgear DC motor (https://www.sparkfun.com/products/12408) driven by an H-bridge that will output up to 12V.
The DC motor has a 5:1 gear ratio, a torque of 0.5 oz/in, and a max RPM of 4900.
The motor shaft is attached to a hub (https://www.sparkfun.com/products/12104) which is then expoxied to a sewing bobbin.
The bobbin is loaded with 10lb braid (very thin but strong).
The payload attached to the line is 47g.
The issue that I am facing is that, without applying any voltage to the motor, the payload will freefall with some resistance.
If I apply a certain amount of torque, the payload can hold its position when the drone is still, but the DC motor makes a very loud and sharp buzzing noise.
Any upward movement of the drone will make the payload lower itself, and any downward movement of the drone will make the payload lift up closer to the spool.
This does not seem to be a good design at all.
What type of motor, gear, and control mechanism should I be using if I want:
- light weight motor (<30g)
- the payload kept steady in its position regardless of how the drone is moving
- the ability to quickly drop a quickly lift the payload (at a rate of at least 0.25 m/s with a spool of ~1.5cm diameter)
Thank you,
Wadii
G-IV
NI Employee (retired)
03-08-2016 01:09 PM
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Hi liquidwad,
I don't think this is the best place to get a good answer to your question. This forum is mainly to support National Instruments hardware - I think that you might have better luck looking here:
HobbyKing Forums: Electric Motors - https://www.hobbyking.com/hobbyking/forum/forum_topics.asp?FID=31
Based on the application you just described and the behavior you are seeing, I would first suggest maybe staying away from using DC motors. I say this because DC motors don't really have any idle torque, unlike a stepper motor, which isn't going to turn unless you tell it to turn.
Outside of that, I think you are better off looking at the HobbyKing forum for this answer.
G-IV
