brushed motor cooling

[myzter]

Any ideas how to add cooling to a small brushed motor ?
- main goal is too cool the motor shaft/brushes area or commutator..

When it gets too hot, I remove a brush (or 4) to let air escape the can... cooling fins are available... but I was tooling with drilling a small hole on either aluminum ends and pump air thru it/

[youtube]O5FlG4ADOuY[/youtube]

 

[parabellum]

Spraying water on it?

 

[John in CR]

Holes at both ends and a centrifugal fan blade on the drive shaft to suck air through the motor.

A better answer is to upgrade to a higher efficiency brushless motor. You can get more power and more range from less weight due to higher efficiency than you can with decades old tech that has very little "give" in the performance it can deliver. Brushless, unless it's already at it's physical rpm limit or the rpm limit of its iron can be pushed to higher performance simply by increasing the voltage and decreasing the gearing ratio by somewhat less than your increase in voltage and you bike will come alive. Plus, especially in the case of outrunners, increasing their heat dissipation is a relatively simple manner.

 

[myzter]

A better answer is to upgrade to a higher efficiency brushless motor. You can get more power and more range from less weight due to higher efficiency than you can with decades old tech that has very little "give" in the performance it can deliver

I do understand your comment although I also ride in rain/snow, I have looked at brushless motors for hours and hours..

here is my issues:
- how to enclose an C80100 for example: and add cooling for <$300 total, would still need to carry around high voltage (72Volts), then show me a low cost +2000watt brushless controller with low rpm/speed capability for under $50.

however my new 24Volt brushed system is probably lighter (single reduction stage), more robust in all-weather/season riding.. lower operating voltage... easier to modify for legal limits / and add a voltage boost if needed /straight battery to motor connection/ ... even a lower cost setup.. my 1500Watt controller was under $20... and the ability to run off really low voltage
ie. solar array/fairing output

I was also able to split my 36V pack (2x 5S1P) in half and wire in parallel for double the Ah capacity (super easy recharging) and I think a longer peak voltage performance/ + less voltage sag under load ??
/ I carry my 6lbs battery in a backpack and occasionally ride 8km to the skate park for some 2-3' air-time maneuvers .. then ride home..

Voltage - 24V
Peak Efficiency (PE) - 82%
RPM at PE - 5500
Horsepower at PE - 1HP
Current at PE - 37 Amps
HP Range for 75%+ Efficiency - 0.4 to 2.0
No Load Amps - 3.4
Weight (pounds) - 3.8

idk +10% efficiency is very interesting.. I just want to ride right now and slow down the endless R&D expenditures for a year would be nice

##
my interest is in removing hot air from inside of the motor..

 

[JackB]

Blowing air across the rotor winding is how you cool a motor.
You can add an external fan and an air filter for the incoming air if you ride in dirty air locations.
You can water/oil cool them too, but a lot more complicated.
Hope that helps.