Quote:
Originally Posted by asheck
I guess my bottom line is this. He said the 2200 would have smaller amp spikes, then the 2650, when they were the same speed. From my experience this is not true, I found the smaller higher KV motor to draw less amps, when geared for the same speed. .
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It's true only if the motors have the same size. Here, between the 2200Kv and the 2650Kv, the difference does not come from the windings but from the length of the rotor (both motor have same windings 1Y and same windings thickness).
Therefore gearing for the same speed, both motors will draw the same amp, but as the 2200Kv will spin lower, there will be less magnetic losses in it, so it will be more efficient and draw a little less amp for the same power.
The longer the motor is, the cooler and more efficient it generally runs, that's true if the motors have the same design and windings.
Given that, a 1520/1Y geared for the same speed will run even cooler than the 1515/1Y.
But its true that for the same size, the lower Kv will need higher voltage. For (simplified) example you can run the 1512/1Y at 120A but not the 1512/1.5Y which is rated at only 80A (more wires turns, less thickness, but lower Kv...).
More Kv means less inductance, meaning more amp spikes (lower response time). "Torque" is sometimes judged at the feeling of the driver, it should be better to talk with torque per amp. Less Kv means more torque per amp.
Hope it's clear
