Why Do I Need a Converter?

A 3 Phase Converter is needed when the “phase” required does not match the “phase” available.  In other words, the equipment needs 3 phase power and only single phase power is available.  Phase converters operate by converting single phase power into three phase power.  They can also provide split phase voltages from the three phase power source.  A 3 Phase Converter is used to allow operation of three phase equipment when single phase electrical services are the only power available or vice versa.  The majority of the time phase converters are utilized to produce three phase power from single phase power sources as utility companies will associate higher fees for three phase electrical services due to the extra transformers, cabling, and metering required.


There are two technologies available for Phase Conversion.  Static or solid-state phase converters produce the three or single phase power required through a double conversion process utilizing a rectifier and inverter.  For creating three phase power, a static phase converter will use the rectifier and inverter to create a single voltage, which is added to the (2) legs of the single phase power source; therefore, resulting in the three phase power required.  The output of the Static Phase Converter will meet the same standards as utility with a pure sine-wave output.  However, it is important to note that a static phase converter cannot alter the frequency.  Only frequency converters are capable of handling this more demanding power conversion process.

Rotary phase converters produce three or single phase power required through the use of a three phase motor and capacitors. To enhance phase balance and power factor, Power Systems & Controls uses a two motor solution. The first motor creates the three phase power.  As a result, the second motor runs the load.  Rotary phase converters are cost-effective and efficient way to run three phase motors on single phase power sources.  They are best for applications involving heavy loads, resistive loads, multiple motor loads, or CNC machines.  However, it is important to repeat the point that a rotary phase converter cannot change or effect the frequency.  Only a frequency converter will make the transition.  The difference with this Rotary vs Static is the capability to handle industrial loads.

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