# Thread: designing high torque motor

1. robot maker Guest

## designing high torque motor

looking at the HSR-5990TG that alot of us use for robotics and find out how to make one much better with half the current and about 5 times more torque
what HSR-5990TG has is 541 oz stall at 7.2 volts idle current 280 ma
my design is stall 2336 oz at 7.2 volts 150 ma
will post the design as i am finished it will be near the same size .771 x 1.5 x 2.5 high
cost will near the same HSR-5990TG is \$125, mine about \$100 or less
Last edited by DresnerRobotics; 09-28-2008 at 11:58 PM.

2. ## Re: designing high torque motor

Very intriguing, how far along are you?

3. ## Re: designing high torque motor

I would love to see it Robot maker, What is your time frame with this servo?

4. ## Re: designing high torque motor

So this servo will have 1/10th of the speed (~5s for 180degrees)? Or are you just lowering the idle current (in which case the stall current would be ~25A)?

Physics kicks in at some point.... A quick calculation shows the HSR-5990TG uses [email protected] at stall, or about 37W. 541oz-in = 33.8ft-in = 3.8nm, 0.17s/60degrees = ~1RPM = 3.14rad/s, 3.8nm*3.14rad/s = 24W = about 65% efficiency. So um, its not like the HSR5990 is really inefficient... something else has to give...

-Fergs

5. ## Re: designing high torque motor

My only regret is that I can't give you more than 1x+Rep for that post, Fergs.

6. ## Re: designing high torque motor

+Rep from another mod

7. ## Re: designing high torque motor

Personally I'd wait until I had the proof of concept built with pictures/video and verifiable proof of how much torque and current draw the unit can produce/draw before I posted

8. ## Re: designing high torque motor

You're such a big meanie, Tyberius!

As long as you have all the numbers and science to back it up, a theoretical post can be intriguing, imho. "Thinking Man's Design" and all.

Thanks, Alex! I really felt compelled to up-rate that post twice - thanks for making that a reality!

9. ## Re: designing high torque motor

You're such a big meanie, Tyberius!
Yeah, I know right? I think I'm going to have to put some tacks on his chair or something... maybe nails?

10. ## Re: designing high torque motor

As long as you have all the numbers and science to back it up
Exactly.

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