The idea that frequency converters in industrial automation products inherently save energy is a misconception. Whether a frequency converter can achieve energy-saving effects depends on the specific application.
Myth 1: Many people believe that even if the torque of two motors is not at the rated torque level (the frequency and speed are still the same at 50Hz), the frequency converter will still save energy. This is a misconception.
Myth 2: Two identical motors operate at a 50Hz power frequency, one using a frequency converter and the other not, both with their speed and torque at their rated values. Most people would assume the motor with the frequency converter would be more energy-efficient. This is also a misconception.
Myth 3: Under the same conditions, many people believe that a lot of electricity can be saved when the load is unloaded, but in fact, the unloaded state of a driven load does not save much electricity.
The reason why frequency converters can achieve energy saving in most cases is that they control the speed of the motor. However, most speed control devices can achieve this effect, so it is clear that we cannot conclude that frequency converters are energy-saving products.
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