Electronically generate rotating magnetic fields

摘要

Many applications, such as medical therapies, magnetic stirrers, and induction heating, call for a rotating magnetic field, which you can generate by attaching multiple permanent magnets to a dc motor. This technique involves problems, including noise and the need to maintain the moving parts. This Design Idea describes how you can instead use a microcontroller and a full-bridge driver to generate variable magnetic fields without mechanical elements.