Phase Converters

Whether static, rotary, or electronic, a phase converter produces 3 phase electrical power from a single-phase source. In this way a site with only single-phase electrical service can operate 3 phase equipment.

Using a phase converter can be more cost-effective than paying an electric utility directly for 3 phase service, which is often not available in the first place due to the requirement of 3 transformers and different metering equipment.

Electronic phase converters represent the most modern method of conversion, rectifying incoming power and synthesizing the 3 phase power with the highest efficiency and power quality. Since the 1960’s, rotary phase converters have provided modest volatege balance by using capacitors and a 3 phase motor to generate the third phase. Static converters are the oldest (100 years) and simplest type, using a start capacitor and a run capacitor, plus a relay to switch between the two capacitors. Once the motor has reached operational speed, the start capacitor is switched out of the circuit. Static converters provide very poor voltage balance and should be used only on lightly loaded intermittently used motors.

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