Just a quick one.
Planning on an 8:1 kart set-up,
24v 750w motors with 10 tooth on the front, 80 on the rear running each wheel.
Does that sound about right?
Thanks.
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Just a quick one.
Planning on an 8:1 kart set-up,
24v 750w motors with 10 tooth on the front, 80 on the rear running each wheel.
Does that sound about right?
Thanks.
With 750W motors, you'll probably want to gear it for somewhere around 12 mph; that way you have a fair bit of speed, but shouldn't burn your motors out. 8:1 sounds ok, though it depends on the size of the wheels.
You might find this useful - https://wahiduddin.net/calc/calc_speed_rpm.htm - It is imperial and it does want the radius rather than the diameter which is a pain but it works.
Personally I think 12mph might be a little slow in the new arena which will be much larger than the Live event arenas but its up to you and what you feel you can control when going flat out.
I feel it's more down to what the motors can handle; gear for too much speed and you won't get much pushing power and the motors are more likely to burn out. Acceleration is also a factor; gear too fast and you'll take a long time to change direction and you may not even reach top speed. You need to balance motor power between speed, torque, and reliability for a good drive setup.
You haven't said what rpm the motors will do.
Technobots has a few handy calculators for these kinds of questions http://www.technobotsonline.com/gear...alculator.html
Movimotors run around 3000rpm. Some a bit faster, others a bit slower.
Cart tyres are not small, but the difference between fronts and backs is substancial. What size did you have in mind?
Imagine a 10" wheel. 3000rpm/8= 375 rpm on the wheel. Gives around 17 kph.
Overvolt the motors to 36V, and the topspeed goes up to 25kph+
It's up to you, but I like higher voltages and bigger gearratios.
It'll just be the sprocket and chain I'll be using from the kart, everything else will be built by myself.
the wheels I'm planning on using are 150mm
150mm. Overvolting will be a good thing then.
But , 150mm diameter cart wheels, never seen those.
Personal experience, bigger wheels have advantages.
What does the movimotor weigh? The same as a Bosch 750W?
Btw, on Supernova, I used a 8:1 ratio, 250mm wheels, with a bosch 750W at 36V and a 4QD Pro 120. Worked fine but was a tad warm after fights :)
Tad heavier, around 4.2 kg as used in Brutus. Heavier body mainly
I didn't know that! that's almost half a kilo heavier per motor then the bosch 750!
On par with the Iskra's. Those motors use a solid 5mm wall steel tube as motorhousing with ali endcaps.
No taping off the vent holes and so on.
Hi Mario, What model Movimotor are you referring to and how much does it typically cost?
No Idea and no Idea. It's a 24V version with around the power of a Bosch 750.
Not too sure on the model, but the ones ive seen are priced at £180 a pair, so worth a punt i think.Quote:
Originally Posted by overkill
I do like the 24v 800w iskras. 2.5kg, solid with no holes to speak of and terminals to hook up to. Smaller than a bosch 750. Shame they are over £200 new.
dc electric motor series s114se
Movimotor - MMP10-4515Quote:
Originally Posted by jay
Ellis components are selling the 750w Movimotor as a Bosch replacement for about 95 quid. Looks like quite a strong unit with the exception of the Cast end caps. Shouldn't be to much of a problem though as long as the motor body is well secured to the chassis.
Have you attempted to run them at 50v Mario?
I didn't run them at all. I just handled them a bit.
And, no, it isn't a good idea to run them at 50V. That's double the rated voltage. It's been a rule of tumb since the start of RW that overvolting more than 1.5x will result in broken motors.
LOL, I know - ive done it with a GPA to see how much abuse it would take, quite a lot as it turned out - Makes lots of smoke though :-)