Zenor Electric, Inc. || Written-Pole Single-Phase Irrigation Motors

Written-Pole^® Single Phase Motors

Written-Pole^® Single Phase Motors offer a revolutionary method for powering large horsepower applications in locations where only single-phase power is available.

The Written-Pole^® motor is a hybrid concept, which utilizes basic concepts from induction, hysterisis and permanent magnet motors, with several important distinctions. You can download the technical specifications here.

The primary feature which differentiates Written-Pole^® single-phase motors from more conventional designs is a continuous layer of ferrite magnets on the surface of the rotor, along with a high-density exciter winding contained within the stator winding. This unique design matches the pole structure of the rotor to the rotational speed of the motor. The result is a motor that combines the desirable starting characteristics of a high-slip, high-power factor cage motor with the energy-efficient operation of an AC permanent magnet motor-- without relying on power electronics, reduced voltage starters or phase converters. The result is a powerful motor with:

Low starting current
The Written-Pole^® motor starts on as little as two times or less rated current. This eliminates voltage sag interfering with other customers.

High horsepower
Conventional single-phase motors are normally rated at 15 hp or less. The Written-Pole^® motor is available in sizes from15 to 100 hp. The motor is powerful enough to replace internal combustion engines or even costly extension of three-phase service.

High efficiency
Unlike most conventional single-phase motors, the Written-Pole^® motor has high efficiency – 92-95% and high power factor-.99 to unity compared to 85% efficiency for conventional motors.

Enhanced reliability
The Written-Pole^® motor is simply designed and robustly constructed. It can be expected to provide years of dependable service, even under demanding environmental conditions.

Developed By Precise Power Corporation

Precise Power Corporation, a Bradenton, Florida based motor and generator manufacturer, with support from the Electric Power Research Institute and numerous electric utilities including Manitoba Hydro, this innovative concept is protected by numerous US and International patents.

Written-Pole^® is a registered trademark of Precise Power Corporation