Written-Pole technology is a revolutionary, but fundamentally simple approach to improve the performance of engines and generators. The use of technology-Pole written frees engineers from one of the most fundamental limitations for designers of conventional induction and synchronous machines. Unlike traditional models, where magnetic poles are determined by the geometry of the cage rotor and the stator windings, coil written machines incorporate a unique concept which allows to optimize the geometry of the rotor magnet for Peak Performance at the speed of operation of the machine varies.
This new ?Written-Pole? machine technology consists of a rotor design that has a layer of magnetic material that can be changed magnetically to any desired pole pattern while the machine is operating. In conventional machines the rotor poles are mechanically located and the magnetic pattern (or poles) can not be altered after the machine is assembled. The ability to electrically place the magnetic poles is any position allows a synchronous motor to be built that has a very low per-unit direct line starting current, high operating efficiency, and very high inertial load starting capacity. It can also provide generators where the output frequency is independent of rotational speed. The author describes the construction of the Written Pole machine, its starting characteristics, high inertial load applications and large single phase Written Pole motors
Written-Pole? technology is a revolutionary, yet fundamentally simple approach to enhancing the performance of electric motors and generators. The application of Written-Pole? technology frees engineers from one of the most basic constraints faced by designers of conventional induction and synchronous machines. Unlike conventional designs, where the magnetic poles are fixed by the geometry of the rotor cage and stator windings, Written-Pole? machines incorporate a proprietary concept that optimizes the magnetic geometry of the rotor for peak performance as the operating speed of the machine varies.
Limitations of Conventional Technology
The speed of an electric motor is directly proportional to both frequency and number of poles. Conversely, the output frequency of a generator is directly proportional to its speed and number of poles.
The requirement for smooth balanced output dictates that conventional electric machines must have an even number of magnetic poles with an equal number of north and south orientations. As a result, conventional electric machines are typically classified as 2, 4, 6, or ?. pole machines, having either 1, 2, 3, or ?.. pairs of north and south poles respectively. Deviating from this principle will produce an electric machine that is magnetically unstable at its rated speed and unsuitable for steady-state operation.
Written-Pole? technology frees designers from this constraint without contradicting the fundamental rules that govern the operation of electric machines. The technology makes it possible to produce a pole pattern that correlates directly to the rotational speed of the machine enhancing performance through a considerable speed range.
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