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Been thinking about motors for a disk today and as brushless is out my range and speed 900's are under issue was wondering about the minimag(E30-150) to drive a disk but want some other opinions?
Proposed disk for it to drive is 1.5kg twin tooth
http://www.robotmarketplace.com/products/0-E30-150.html
brushless is out your range but you will spend near enough £100 for a motor from the states (incl delivery and taxes)? Brushless can be done on the cheap with effective results.
Smaller scorpion motor with a cheap esc job done.
What would you recommend?
Motor and ESC I use in Drumroll:
http://www.ebay.co.uk/itm/Scorpion-HK-4 ... 4ab6a39910
http://www.ebay.co.uk/itm/RC-Car-Brushl ... 3a7c6bd9d1
The ESC is really good value for money, although it was only £69 when I bought it last year. Likewise, the Scorpion motor was £85 when I got it, seems to have shot up quite a bit now though.
You can get cheaper alternatives (try HobbyKing) but I couldn't say how the cheaper/lesser known brands compare to each other.
Well if we stick with scorpion motors because they are high quality and if it gets nackered you can send it back to scorpion and pay a cost price for a replacement (done it myself before)
http://www.hobbyking.com/hobbyking/stor ... Motor.html
Something like the above wouldn't be a bad shout. Only thing you will have to keep in mind is the KV rating. Basically take this number and multiply by the number of volts you will be passing through the motor to get the motor rpm.
Twice the power as well.
Esc wise well tbh I haven't had great luck with the more expensive esc so this year I'm going to run some dirt cheap ones and see how it pans out.
Going to use the base for the 85a botbitz controllers
http://www.hobbyking.com/hobbyking/stor ... _SBEC.html
The advantage is that I can order a bunch and hack some for my drive whilst using the others for brushless drum weapon
Sorted now, running not only a mag, but the A28-400 ehind a disk thats 1.5kg! Thanks to a very nice roboteer that shall remain unnamed but this is turning into a machine thats going to scare me! That disk will fly
Probably goes without saying, but make sure to build the chassis strong enough to cope with that, otherwise the only flying the disc will be doing is flying out your robot and across the arena :wink:
Surely for a weapon as comparatively light as 1.5kg, the BIGGEST ampflow is insane overkill?!
Looking forward to seeing this... :o
Just to confirm...
You are putting a $419, 4.5 horsepower, 3.1kg motor in...
Just for the weapon?
For comparison Revo's weapon is powered by a Speed900 clone (£12) and an £8 ESC.
You can get a decent Brushless system from HK for £50.
Oh trust me, there is overkill for a weapon, then therr is using the biggest mag but it was a great price and comes with controller, cost me less than a brushless motor on its own
If we purely go for Advertisment HorsepowersQuote:
Originally Posted by Eventorizon
Hobbyking sells a combination of a 9 HP motor and speedo for less than £350.
I know but I don't trust hobbyking at all... on anything, but I know that it its possible with a brushless motor.
But I know how powerful the Mag motors are, insanely for such a small size.
The disc will be up to speed in less than a second probably; like mine I guess, and have so much torque that it will not just cut but toss opponents as well.
I just hope the mounts are strong otherwise self destruction is a distinct possibility.
As the motor is quite so large, could I get away with going for an increase insted of a reduction?
Overdrive is a distinct possibility provided you have the torque available.
Oh, I'd have thought big overdrive is easily possible, with that much torque.
Think the fact heavies use them for disks, I could go with an increase but then how much?
put it on a 1:2 or 1:3 ratio. The big magmotor is pointless as you will waste so much weight in the motor. Oh and to handle the torque you will need to make sure that you have heavy duty belts or chains to handle it
Mind you back in the day I had hornet 2 on a 1.8kg disc with the mini mag. Worked fine on a 1.5:1 ratio.
For a brushed motor I'd just go with a big solid state relay. Don't bother with a controller as it will fry unless severly oversized.
Got the relay sorted
Will either go buy some large belts or use some of the same chain that I use in bulldogs drive, got plenty of it