The 1-to-3 Power Source™ with Velvet Start™

Available in 50 75 and 100 hp configurations.

Demand for three-phase power is growing much faster than the availability of three-phase service. Many agricultural, telecommunications, industrial and municipal applications are best powered by three-phase equipment. However, in most remote land areas, only single-phase service is available. The 1-to-3™ Power Source from BELLE™ Motors solves this problem. Using revolutionary Written-Pole® technology, the 1-to-3™ avoids high fuel and maintenance costs, and pollution of fossil-fuel- powered engines. It delivers superior power quality to that of conventional phase converters and is far more cost effective than extension of 3-phase to single phase utility customers, providing benefits across a broad spectrum of applications.

• Written-Pole® motors are well suited for conversion of single-phase to three-phase power. A Written-Pole® single-phase motor can drive a three-phase conventional generator to produce clean, balanced voltage.

• The single phase to 3 phase converter circuit can start multiple smaller 3-phase motors. The 1-to-3 Power Source™ can start a single motor up to about 50% of its rating and other smaller motors up to its output rating.

• Because of the high load synchronizing capability of the Written-Pole® drive motor, a large flywheel can be added to greatly improve the motor starting capability of the three-phase generator.


The 1-to-3™ avoids the need for extending three-phase distribution. Where single-phase service already exists, upgrading the lines to three-phase typically costs $30K – $100K per mile. By using the 1-to-3™ to provide power for three-phase applications from existing single-phase service, utilities and their customers can save significant costs for investment in fixed assets.


Many utilities charge monthly fees for three-phase availability (to amortize investments) whether or not the customer actually uses the power. Use of a 1-to-3™ can avoid over $12K to $60K per year for these charges. In addition, the Written-Pole® motor driving the 1-to- 3™ is highly efficient, resulting in full load efficiency exceeding 88%. This alone can reduce energy costs by thousands of dollars, year after year. And since the 1-to-3™ input runs at unity power factor, there is no power factor penalty charge. In some areas, this translates into significant additional savings.


The 1-to-3™ can be used effectively in place of the diesel or gas engines that are often used as the prime movers for pumps or generator sets. The Written-Pole® motor requires very little maintenance compared to engines. Air and noise pollution are also reduced. Most importantly, reliability is greatly improved.


The 1-to-3™ allows weak single-phase lines to deliver strong three-phase power with excellent voltage regulation and precise 60 Hz frequency. The generator output voltage provides well-balanced three-phase power capable of starting and running large three-phase motors or power quality-sensitive electronic controls. This equipment isolates the application (and the utility) from harmonics that are harmful to sensitive loads.


Written-Pole® motors start using only 1.7x their rated running current. This eliminates excess voltage sag or “flicker” that can cause problems on distribution lines. The efficiency rating of the motor is 95.5% and the generator efficiency is 93.5%, resulting in an overall efficiency of 89%, with 100% electrical isolation. With the 1-to- 3™ Power Source, customers served by single-phase lines can get high-quality power for three-phase applications. Unlike conventional phase converters, the 1-to-3™ provides true, balanced three-phase power, eliminates disruptive harmonic feedback, is a unity power factor load to the utility and, with an added flywheel, can ride through momentary power interruptions with ease.


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