View the Single Phase Motor video below:
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.
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 three times or less rated current. This eliminates voltage sag interfering with other customers.
Conventional single-phase motors are normally rated at 15 hp or less. The Written-Pole® motor is available in sizes from 30 to 75 hp. The motor is powerful enough to replace internal combustion engines or even costly extension of three-phase service.
Unlike most conventional single-phase motors, the Written-Pole® motor has high efficiency – 92-95% and high power factor compared to 85% for conventional motors.
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.
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