Basic Explanation of the Working Principle of Operation of
the PM/ PEM, M-G
Permanent Magnet / Pulsed DC Electromagnet
Motor - Generator
The permanent magnet / pulsed dc electromagnet motor - generator is based
upon simple physics. This is a simple, uncomplicated system. A 2-cycle, 5
horsepower, gas Briggs and Stratton motor is more complex with more moving
parts. There is nothing here that a high school student with a good working
knowledge of auto mechanics and basic physics could not build -- and understand
how it works.
The PM/PEM,M-G consist of two opposing disk, a rotor and a stator.
The rotor is connected to a shaft [ axel ] by means of a flange. The shaft is
mounted to a frame through two bearings that allow the shaft to rotate while
mounted on the frame, one on each side. Attached to the rotor are eight
permanent magnets arranged equidistant around the perimeter of the rotor facing
The stator is fixed in position next to the rotor but independent of the
shaft. The shaft runs through a larger diameter hole centered on the stator.
Mounted on the stator are eight electromagnets that are arranged directly
opposite the permanent magnets of the rotor.
As the rotor rotates, the permanent magnets come into alignment with the
electromagnets. During this phase the permanent magnets are attracted to the
iron, steel core of the electromagnets. Torque is provided to the shaft by the
magnetic attraction of the permanent magnet and the iron, steel core. No power
is consumed. This is the Attraction Phase of the Power Cycle. As the permanent
magnet rotates past the center of the electromagnet, a power pulse is fired
through the electromagnet. The like polarity of the electromagnet and the
permanent magnet cause the permanent magnet to be repelled. Torque is provided
to the shaft by means of the magnetic flux of the permanent magnet and the
magnetic field generated by the electromagnet. Power is consumed for only a
brief [milliseconds] period of time. The power pulse is delivered at the optimum
time for the optimum duration by an infrared laser and photo detector switching
system. This is the Repulsion Phase of the Power Cycle.
Most of the work, power delivered to the shaft in the form of torque, is done
by the permanent magnets. Because power is consumed for only a brief period of
time upon each alignment of the permanent magnet and electromagnet, very little
power is necessary to run the motor-generator, making it highly efficient.
Pick-up coils wound around the electromagnet utilize the collapsing magnetic
field [back EMF] of the power pulse to generate a current that can be employed
to recharge secondary batteries.
A small DC generator is connected to the shaft of the permanent magnet / pulsed
dc electromagnet motor to power a load.
This is a basic explanation of the working principle of operation of the PM/
Page posted by Sterling
D. Allan, May 26, 2004
Last updated May 27, 2004