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Serum · 12.07.2006, 02:59 AM

So you now know that a 4 pole has got more torque than a 2 pole. You see, you learn every day..

Twice the torque? not entirely. You have got about the same amount of magnetic material, which can produce a maximum amount of torque, so a 4 pole won't have got twice the torque of a 2 pole. (it would be nice though)

The EMF is used to locate the rotors position. This EMF is produced (and needs to be high enough) while the motor is spinning at a certain RPM, which makes the signal high enough to make the controller decide where the rotor is located.

Most controllers start with a fixed RPM and expect the motor to follow, from there the EMF is used as a steering signal.

You forgot an important thing in you notings which makes a huge difference for motors.; internal resistance of the stator.

	(#80)
Serum RC-Monster Admin Offline Posts: 10,480 Join Date: Feb 2005	12.07.2006, 02:59 AM So you now know that a 4 pole has got more torque than a 2 pole. You see, you learn every day.. Twice the torque? not entirely. You have got about the same amount of magnetic material, which can produce a maximum amount of torque, so a 4 pole won't have got twice the torque of a 2 pole. (it would be nice though) The EMF is used to locate the rotors position. This EMF is produced (and needs to be high enough) while the motor is spinning at a certain RPM, which makes the signal high enough to make the controller decide where the rotor is located. Most controllers start with a fixed RPM and expect the motor to follow, from there the EMF is used as a steering signal. You forgot an important thing in you notings which makes a huge difference for motors.; internal resistance of the stator.