Liberty engine..

[aussiebattler]

I would suggest an investigative survey of the relationship between the number of poles and speed and frequency of an AC alternator and see if you come up with anything fishy .

[citfta]

Two points.
1. the auto radiator fan motors have 2 ceramic magnets in them.
2. My electric bike motor has neos all around the outside stator.

My thinking is that the magnets provide part of the power and thus saving the loss of powering two coils. My guess might be 30-40% but not 50%.

Any thoughts on what those magnets really do?

Norman

Hi Norman,


The radiator fan motor is just a normal DC motor that has the field coils replace with permanent magnets.  Those kinds of motor are commonly used in industry.  And as you suggested they are more efficient because no current is needed to power the fields.


Your bike motor is a 3 phase motor that also uses permanent magnets to replace the fields.  You have a speed controller that controls the pulses to the drive coils and the speed of switching determines the speed of the motor.  Those type of motors are also commonly used.  You see a lot of them in RC airplanes and also in industry.  And again the magnets make for a more powerful and efficient motor.  Some of the motors used in RC airplanes can fit in the palm of your hand and any yet produce 1 HP of power.  Amazing little motors.


Take care,
Carroll