Phase Converters also cut some of the horse power of the equipment being used. The cheaper types cut the most power...here is a cut and paste from somewhere on the internet.
Below, you will find a list and a brief description of each one. The static and the rotary converters are the most popular ones in the market today.
Static-Phase Converters: These are the first phase converters and have been around the longest. The uses are limited, and if you have a smaller motor or one motor, these may do the job. Remember that static-phase converters do not convert one-phase power to three-phase power, nor do they generate three-phase power. The static-phase converter will not power any type of machinery with three-phase circuitry. Static-phase converters operate by producing a third-phase of power for only a few seconds doing the startup of electrical motors.
Read more about static-phase converters.
Rotary-Phase Converters: A rotary-phase converter is designed to power larger equipment and higher HP motors, and a single unit can provide a continuous reliable source of three-phase power to more than one machine. These converters are a popular choice when you need a continuous source of three-phase power. A rotary-phase converter uses it's own motor to generate the third, high leg of power as well as passing on the other two legs of power provided by your single-phase power source. Not all rotary converters are the same; many companies just convert single-phase power into unbalanced third-phase power. Quality three-phase rated converters use a balanced three-phase generator with power factor correction. Properly installed, a rotary-phase converter should operate 35 years or longer.
