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US5191258: Electric current generator including torque reducing countermagnetic field

An alternating electric current generator comprises an armature rotatably carried by a drive shaft and positioned between stabilized, non-moving magnetic elements. The armature has first and second magnetic field transmitting sections with a magnetized section sandwiched therebetween. As electric load is applied to the generator, a countermagnetic field is generated through the armature to increase speed of the drive shaft and thereby lessen torque required to rotate the drive shaft.
Patent 5191258:

generator, energy