RPM of AC Motors

This interactive presentation, created by Terry Bartelt for the Electromechanical Digital Library, discusses the rotations per minute (RPM) of AC motors. Bartelt begins with a discussion of the magnetism that allows most of these motors to function. The author addresses such factors as the frequency of the applied voltage and also the number of stator poles located in the magnetic field. Two and four pole motors are then discussed and compared to each other. Bartelt explains each using helpful interactive flash animations. These are not only useful in explanation, but they allow the student to more fully engage with the topic. The author concludes the presentation with a brief series of questions.