Permanent magnet motor magnetizing and calibrating

The types of magnetizing equipment that are available include capacitive discharge, half-cycle and electromagnet units. The applications for, and limitations of, each type of unit are briefly reviewed. The range of permanent magnet materials commercially available. In designing an effective magnetizing and calibrating system, consideration must be given not only to the magnetizer to be used, but also to the following: design of the actual fixture to be used; the desired cycle time (usually cycle time is dictated by the approximate percentage of knockdown from saturation and the window of tolerance from minimum to maximum); the physical size and shape of the magnet including steel pole pieces or structure that will be present during magnetization; and the characteristics of the magnetic material itself. Without a complete description of these requirements, the wrong magnetizer may be chosen for the job. Examples of designed systems are described involving the magnetization and calibration of various assemblies