I've been looking for high torque, low cost motors. And I noticed that brushless drill motors may have a lot of torque for their cost. They cost like $150.
Brushless drill motors?? Where do you find them?
All the drills I have had over the years and all I see in shops are brushed motors.
Torque is inverse proportional to speed in any motor.
Low cost = brushed motors.
And I figure if I open it up, I could find a simple way to control the speed using a very low power, cheap servo.
Then you'll have a chain with... A servo controller controlling the servo - acting on the speed controller - that in turns controls the speed of the motor - why not throw in some duct tape to further this really slick design
Or... You could make a new speed controller, in case you hope for this to be marketable
I haven't been able to find plain brushless motors and drivers for them. It's as if nobody uses them directly that way.
Only most R/C model flyers an quite a lot R/C cars and boats, all hard disks and CD/DVD drives etc. etc. and quite a number of hobbyists build them from raw stock material.
Any R/C shop, on- and offline, have a range of brushless motors and controllers for them.
You'd need to gear it down and you'd need an outrunner, as they are slower and higher torque than inrunners (they can be found at speeds ranging from around 700 kV and up to several thousand kV (kV = RPM/volt).
Check out these (and for price comparing to brushed motors, remember that you need a controller a well)...http://www.hobbyking.com/hobbycity/store/__517__59__Brushless_Motors-Outrunners_by_size.html
Any thoughts on this? Is this a bad idea for an industrial robot design?
The "power drill and duct tape design"?... What do you
Ignore the fact that it could be ugly using a drill directly I'm trying to find ways to cut the cost because cost has historically been a prohibitive factor for my application.I
can ignore that, but I'm not a potential customer!
Well, actually I don't think I can. If someone presented such a thing to me, i don't know if I would be embarrassed on their behalf or if I'd get stomach cramps from laughing - Selling takes creating trust in your product and I clearly wouldn't trust a gizmo straight out of a cartoon.
Not trying to get you down here, just telling you that I think it won't sell unless you put some effort into the appearance of the product.
And make sure it works 110% before you demo it. We have all experienced a salesman trying to cover up something that doesn't work with a "it worked perfectly just yesterday" or similar - they don't sell a lot
A prototype you keep in your garage is one thing. A demo model should be lean, visually appealing and work flawlessly.
I don't think you have much chance of selling anything with a power drill attached - industry won't have much faith in such and it will be blazingly clear that you don't know what you're doing, if you try to market such a franken-bot.
My best advice, grounded in your various posts, is to partner up 50-50 with a local person savvy in both mechanics and electronics (I get the impression that you have the software and vision system competence yourself) - 50% of something is better than 100% of nothing and the synergy from having a partner to bounce ideas around with is gold.
I don't need accuracy or repeatability. All I need is torque and speed, and the ability to control speed a bit. I'll guide it with computer vision and a computer model.
A geared down brushless motor is the smallest and lightest when comparing equal output power, but it needs a controller that is way more expensive than a brushed motor does.
A regular brushed DC motor is much easier/cheaper to control, but will be a little heavier at the same speed and torque.
Brushless are longer lasting, as there are no brushes that wear down and they don't spark, so they don't ignite combustibles.