Posted by MarkB_MI on July 09, 2018 at 02:52:59 from (174.230.6.120):
In Reply to: Re: Electric DC Motors posted by vicinalvictor on July 08, 2018 at 13:24:48:
> If I install a larger secondary driven gear, the motor would run faster but cooler, right?
The heat put off by a motor is a function of how much current is going through it. And the current through a DC motor is proportional to the required torque.
Another thing to consider is "back EMF", which is the voltage induced in the motor as it turns. This voltage opposes the flow of current through the motor and increases as motor speed increases. At "no load" speed, back EMF equals the applied voltage. That's why DC motors turn faster the more voltage you apply to them, and why they draw less current as their speed increases.
As for burning up your momentary switch, that depends on the switch. As I mentioned earlier, what kills DC switches is not so much the peak current through them, but the arcing that results when you interrupt an inductive load. That's why most AC/DC switches are derated on DC: a switch that's rated for 10 amps AC is often only rated at 2 amps DC. (AC power turns itself off 120 times per second, so you get less arcing on AC.) But if your motor is getting hot at 24 volts, it will get even hotter at 36V if you don't change the gearing.
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