True Single-Phase Operation

SPPS Written-Pole® single-phase motors are true single-phase motors that do not require phase converters to operate on a single-phase service. The motor's capacitor start/run design is similar in concept to conventional single-phase motors; however the innovative use of SPPS Written-Pole® technology allow for dramatically reduced starting currents and increased operating efficiencies compared to conventional single-phase motors.

Low Starting Current

SPPS Written-Pole® single-phase motors exhibit starting current requirements comparable to conventional single-phase motors one-fourth their size. This feature reduces annoying voltage sags when starting without requiring users to install complex reduced voltage starters.

Their low starting current dramatically enhances the capability of a single-phase service to support much larger motors than previously thought possible, eliminating the need for costly three-phase service extensions.

Starting and Running Current Comparison
230 Volt Single-Phase

Three-Phase Performance using Single-Phase Power

While their low starting current and high operating efficiency eliminate the need for three-phase power in many applications, SPPS Written-Pole ® single-phase motors also compare favorably to premium efficiency three-phase motors in many areas. In fact, Written- Pole®single-phase motors often go beyond three-phase performance, enhancing the system's performance by reducing starting current requirements to levels below that of three-phase motors and eliminating the need for reactive power through their unity power factor operation.

Three-Phase Performance Comparison
208 Volt Three-Phase, 230 Volt Single-Phase

Note: Equivalent line current for a 208 volt three-phase Written-Pole motor would be approximately 66 amps. A Written-Pole ® single-phase motor's lower starting current and unity power factor operation provide real-world benefits even when compared to premium efficiency three-phase motors.