What To Consider About Frequency Converter Size

frequency converter sitting on table for size

Are you trying to determine what frequency converter size to invest in? Continue reading to learn what to consider about frequency converter size. Assuming load characteristics have been established, there are four kinds of motor data that decide the power size of a frequency converter. Use these four kinds of motor data to determine what size you need. 

Rated Current

With method one, you can determine a frequency converter’s power size based off how much of the motor the rated current takes up. A rated current is how much an electrical device can carry without overheating or stress. A motor current can’t be measured accurately if the motor isn’t loaded fully. With a loaded motor, determine frequency converter size based off the motor’s rated current. Make sure the calculated power and technical data for the frequency converter are compared at the same voltage.

Apparent Power

A frequency converter can be chosen based off the apparent power that the motor uses and is delivered by the converter. Apparent power is the product of voltage and current in a circuit. In short, it’s the combination of reactive power and true power. It is typically measured in volt-amps (VA).

Shaft Output Power

Select a frequency converter based off the shaft output power generated by the motor. Shaft power is essentially the mechanical power that is forced on the device. Shaft power can be your converter’s input power and the motor’s output power. A frequency converter should be selected based on technical data of the maximum continuous output. Keep in mind that this method can be imprecise.

Standard Series Motors

Determine frequency converter size based upon the standard series motors, otherwise known as induction motor or asynchronous motors. These motors have AC electric motors that have an electric current in the rotor. The electric current is acquired through electromagnetic induction. Therefore, an induction motor can run without electrical connections to a rotor. These are usually self-starting, reliable, and economical. Unfortunately, following the standard series motor sizes can still cause imprecise sizing, especially if the motor is not enduring a full load.

Read more information on how rotary frequency converters work. An established picture of frequency converters will help you make important decisions for how your device will work.  Remember what to consider about frequency converter size before you make an important sizing decision. Consider current, power, and standard series motors when you must determine a frequency converter size. These four kinds of motor data will help you to determine what size you need.


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