Rated Speed 20 to 3000rpm Low Speed Gear Motor with Customized Voltage Options Product Overview The permanent magnet generator operates on the principle of a rotor equipped with permanent magnet materials that produce a steady magnetic field. When the rotor rotates via a prime mover such as a wind turbine, water turbine, or engine, this magnetic field intersects with conductors in the stator windings. According to electromagnetic induction principles, this movement induces an