OT: difference between scooter and cordless drill motors?

Electric powered scooters have motors like this.

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What's the difference between that and modern cordless drill motor?

Size and weight? Obviously cordless drill motors are smaller/lighter. Is that due to higher quality and miniaturization? Or do scooter motors have to be big/heavy?

Power and efficiency?

I'm wondering why a scooter motor has a DC motor controller with a big aluminum heatsink. What sort of motor controller does a modern cordless drill include? Why doesn't it require the same?

Apparently cordless drill motors are powerful, at least the way they are geared. Scooter motors use a belt/chain.

As far as I can tell, given the revolutions per minute, the speed using either motor would be about the same (the scooter motor as assembled and the cordless drill motor driving a wheel directly from the chuck).

What about back pressure on the drill motor that includes "electric braking"? Usually that doesn't happen like with a scooter motor.

I don't necessarily need all that answered, any comments or insights are welcome.

Thank you.

Reply to
John Doe
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Power is Torque x radians per sec. A 250 or 350 watt scooter has 24 or

36V batteries and the controller can PWM 10 amps for at least several minutes. Cordless drills have at most 18V, probably less amps (because the batteries are smaller!) and only put out for seconds, not minutes. Big power needs big batteries and big motor. Good explanation?
Reply to
BobG

Most I've seen are 24 V, some more and some less.

I see some 24 and 36 V cordless drills.

The DeWalt DC900KL is 36 V for example.

Most cordless drills are in the 400-450 in-lbs torque range, whatever that means.

So if the cordless drill is stressed for more than a few seconds, it will overheat/disintegrate?

I'm not concerned about the size of the batteries, I can rig up a larger battery. I do like the idea of being able to port the motor, for other uses.

Thanks.

Reply to
John Doe

I always have to wiki my memory on the relationships between power, force, work, energy... Work = Distance * Force.

I've seen phonograph needles where their pressure on the record was given in tons per square inch (or something like that). When the affected area gets smaller the numbers peak.

Is 'torque' standardized for a particular radius of axle? In this case it should be equivalent work of 400-450 pounds of force at one inch distance (radius) from the center of some axle? Is that enough to move a 400-450 pound person one inch linearly on a frictionless sled?

That's probably a peak power rating that's not sustainable.

Reply to
Graboid

A small motor with a high gear ratio gear head will have lots of torqe, not much rpm. A scooter motor that will push a person at 30 mph needs torqe and rpm. There aint no free lunch. Torque specs are ft-lbs or inch-lbs

Reply to
BobG

It does if connected directly to the axle/wheel at no-load speeds (but of course it would be less than that).

Or 10 or 15 mph.

Cordless drills have some neat attributes though, like torque settings, two gear settings, reversibility, and electric breaking (hopefully switchable).

Torque settings could be useful for acceleration control.

Not sure what to do with reversibility, but it sounds fun.

So what is the typical torque for a 10 or 15 mile-per-hour scooter motor?

I appreciate the input already given, thanks a lot.

Reply to
John Doe

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