Abstract: In many documents and literature, frequency converters are described as energy-saving and power-efficient control automation products. Therefore, many people believe that simply installing a frequency converter on equipment will automatically save energy. This is not the case. The idea that frequency converters themselves generate energy savings is a misconception. Whether a frequency converter can achieve energy-saving effects depends on the specific circumstances of its 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 controlled by a frequency converter and the other by one, both at their rated speed and torque. 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. However, in fact, even with a driven load, not much electricity can be saved when the load is unloaded.
The reason why frequency converters can achieve energy saving in most cases is that they control the speed of the motor. However, in reality, most speed control devices can achieve this effect. Therefore, we cannot conclude that frequency converters are energy-saving products simply because of this.
