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Written-Pole ® Advantages

app_fanTrue 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

Conventional Single-Phase SPPS Written-Pole® Single-Phase

Rating

FLA

LRA

Rating

FLA

LRA

5

22

150

20

68

130

7.5

28

220

30

100

185

10

39

288

40

130

245

15

70

377

60

200

360

FLA – Full Load Amps,  LRA – Locked Rotor Amps

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

Premium Efficiency Three-Phase Written-Pole®
Single-Phase
Comparison
Rating (hp) 30 Hp 30 Hp Equal
Full Load Amps (line) 75 100 33% higher
Locked Rotor Amps (line) 473 185 61% less
Efficiency (%) 94.1 94.1 Equal
Power Factor 0.84 Unity 19% higher
Input Power (kW) 23.8 kW 23.8 kW Equal
Input Demand (kVA) 27.0 kVA 23.8 kVA 11.9% less

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.

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