Written-poleTM motor rides through momentary power interruptions

Momentary power interruptions (MPIs) account for about 99% of unplanned electric motor shutdowns. The written-pole^TM motor has the ability to ride through these MPIs for 10 or 20 seconds while continuing to deliver useful power to the load. This feature could allow system designers to eliminate some expensive devices such as battery powered UPSs to maintain power on motors driving critical loads. It can also improve industrial production by eliminating costly shutdowns of critical processes. The ride-through is accomplished by use of a very high inertia rotor in the written-pole motor, and by use of a unique control technology for the magnetic field in the rotor. The rotor inertia acts as a flywheel energy storage system. The written-pole machine can easily start and run inertia which is 50 or 100 times greater than conventional motors. The written-pole technology can also restart the motor instantaneously after an MPI. All this is done across-the-line, and the motor is synchronous, with unity power factor (or leading PF if desired), and very high efficiency