powering equipment for numerous applications. There are currently several hundred thousand stationary internal combustion engines fueled by diesel fuel or natural gas in use across the U. When compared side by side, if variable speed is not required, our Written-Pole single-phase motors are more dependable, rugged and cheaper to operate.įor many, many years, the use of combustion engines has been the alternative most rural customers have resorted to using. Phase converters and Variable Frequency Drives are sometimes used to create three-phase power, but these technologies have numerous drawbacks that our products do not. This constraint has been a major headache for electric utilities with customers in very rural and often times remote single-phase service areas that have expanding requirements for applications requiring larger motors. The operating characteristics of conventional single-phase electric motors have forced utilities to limit use of electric motors to approximately 10 horsepower, insufficient for the needs of many agricultural producers. Single-phase electric distribution is the prevailing choice for electric utilities serving rural areas due to its lower construction and maintenance costs when compared to three-phase distribution, which is principally used in metropolitan areas. Currently, over 27,000 HP in these motors are in use. The interest of these motors is growing rapidly in rural areas of North and South America where large motors are needed for irrigation and pumping operations, crop processing, grain drying and other similar needs, and where only single-phase electricity is available.

These features along with a high starting torque per amp allow WP motors as large as 100 horsepower (75 kilowatt) to be operated on single-phase power lines that would normally be limited to 10 horsepower (9 kilowatt) or less. In addition, high efficiency and high running unity power factor allow WP motors to operate with a lower total input current, at equivalent voltage, per horsepower than any conventional induction motor available single-phase or three-phase.

SPPS Written-Pole (WP) synchronous motors are highly efficient (93+%) and require a starting current that is less than two times full load running current. Let me give you an overview - in layman's terms - of our unique, large horsepower, single-phase SPPS Written-Pole® electric motors.

10 hp electric motor single phase