A method of calculating the ampere-turns for driving a magnetic flux through wedged-shaped teeth

THERE are several methods of calculating the ampere-turns necessary to drive a certain magnetic flux through wedge-shaped teeth. Some of these methods give a very incorrect result, as, for instance, the method by the mean value of the sectional area of the tooth. A few other methods give a perfectly correct result, but require much time or special curves for every fixed form of tooth and a definite kind of material.