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Parallel Path Magnetic Technology (PPMT) is an advanced magnetic force control technology that is applicable to motors, rotary actuators, linear actuators, and generators. PPMT uses permanent magnets controlled with a field coil in parallel magnetic circuits. PPMT is a simple but revolutionary concept that has been demonstrated in a wide variety of prototype devices. PPMT devices allow the control of a given amount of magnetic flux for less energy input compared to a conventional device. PPMT devices are smaller, lighter, run cooler, and are more energy efficient than their conventional counterparts.
Charles J. Flynn (Sun,) studied this question.