Written-Pole^® Converter Supplies Quality Three-Phase Power to Remote Load;  Meets Stringent Flicker Specification

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Written-Pole® Motor Description

Written-Pole® Ride-Through designs utilize a high inertia external rotor design (Figs. 1, 2).  The magnet layer is rotating with the rotor laminations, rotor sleeve and squirrel cage, outside of the fixed stator and main windings.  The stationary frame is outside of the rotor.  The high inertia acts like a flywheel and rides through power interruptions.

In all Written-Pole® motors, the rotor surface features a continuous magnetic layer and a high resistance rotor cage. The stator features a concentrated winding, called an “exciter,” which when energized, creates a powerful magnetic field used to “write” magnetic poles while the motor is in operation.  These features allow the motor’s manufacturer, Precise Power Corporation of Palmetto, Florida, to design motors with much lower starting current and higher operating efficiencies than conventional designs. The Written-Pole® motor is designed for starting currents of less than 3.0 per unit or three the motor’s rated operating current.  The design allows manufacture of single-phase motors in ratings of 75 HP or less. These are acceptable for operation on most utility distribution/transmission systems, because the starting voltage sag or “flicker” is within tolerable limits.

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