Quote:
Originally Posted by lincpimp
So, as I understand it the esc has a certain rpm limit on 2 pole, why would it have half that limit on 4poles?
The phases much switch more often on a higher pole motor per rotation than on a lower pole count motor. How else does the esc do it?
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I've often thought about this.
I think you have to consider the winds you are dealing with and the physics of what is going on inside the motor.
If you use the same wind in two different motors, only one is a 2 pole motor and the other is a 4 pole motor. The 4 pole motor is going to be half the kv rating of the 2 pole.
As pole count increases, kv decreases for the same wind.
Take a look at some of the available winds and their kv's for various motors.
You can buy a 9000kv 2 pole motor, but you will never see even a 4000kv 12 pole outrunner.
It's a trade off though. Watts is Watts of power.
Lower kv means less rotational speed but more torque.
There is a limit on how many times a minute a ESC can phase shift for a 2 pole motor, but I believe the actual limit is the same with higher pole counts. There is just alot more phase shifts per revolution.
This goes along with what you said, "The phases much switch more often on a higher pole motor per rotation than on a lower pole count motor."