Quote:
Originally Posted by suicideneil
Motors dont draw watts, they make them:
Power (watts) = voltage x current (amps).
I would say compare the listed specs of a neu and hacker that have the same kv rating and length to answer that question (on paper at least).
Since a neu has 4 poles vs 2 on the hackers, I would say you could get away with using a smaller neu to do the same amount as work as a larger hacker- due to nearly double the torque being produced. A 1509 should work okay in a buggy, but I'd say look at other peoples setups to see what they like the most...
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Actually Auto2 is more correct. Motors don't "make" power. Batteries make the power, motors draw power and convert it into mechincal power. So if you switch from 30c packs to 20c packs of the same capacity, you will probably get a little more runtime as the 20c packs will not be able to supply as much current to the motor. Yeah I know, the terminology of "power" is confusing. The true definition of a "Powerful" motor is one that is efficient (enough not to overheat) and doesnt break down at high power inputs (voltage x amps). But suicideneil, I have to admit that it can be very hard to get the point across without saying that "motors" make power.
Auto2, I think this is a question that is best answered yourself. Only you know how much your setup suits you. Does your neu motor feel overpowered or not? If it does, then a smaller motor of equal kv may be better than gearing lower alone, because the smaller motor will draw less current. But since torque is a function of current (this applies for any motor; 2 pole, 4 pole, winding style, etc) the smaller motor will also have less torque, and therefore less power. Think of ratios. 2/3 the current will give you 2/3 the torque, 2/3 the power, and 3/2 times the runitme.
If your 1512 1.5Y has exactly the amount of power you need (personal preference) you can't get more runtime and keep the same amount of power output, just by changing the motor alone, (unless you find a motor that is even more efficient).
Now, 4 pole vs. 2
If you have a 2 pole motor and a 4 pole motor of equal kv and they are both drawing equal amounts of current, they will output the same torque. It doesn't matter if one's 50% efficient and the other is 90% efficient, their oz-in/amp (the amount of force 1 inch away from the shaft, per amp) = 1352/kv - a fixed number that only depends on kv, nothing else. The only differnce is that the 50% efficient motor will be spining at half it's kv and the 90% efficient motor will be spinning at 90% of its kv. It just so happens to be that 4 pole motors may be more efficient than 2 pole motors, so 4 pole motors can get away with pullimg more current to make torque. However, there are good 4 pole motors and there are bad 4 pole motors and a good 2 pole motor can at least be almost as good as a good 4 pole motor.