Pole counter for diametrically magnetized ring or disk magnets

Abstract

The ever-mounting applications of magnets in scientific instruments like PMMC, motors point to the importance of magnetic pole study. Apart from parameters like magnetic field intensity, flux density and hysteresis that are commonly used in magnetic study, a count of the number of poles of a magnet can be another useful parameter of study related to a magnet. One of its efficient uses can be of quality check of stators and rotors for correct alignment and number of poles in manufacturing industries. We proposed a low-cost embedded system based method to directly derive at the number of poles of a ring/disk magnet. A direct count of poles could be useful in industries that use multi-pole rotors in motors and also to check the correct alternate pole alignment in the motors. The design of such pole-counter is possible by the optimum application of Faraday's law of electromagnetic induction, signal acquisition and a peak-to-peak counter. Successful results have been demonstrated through the designed prototype.