What consequences may arise from operating an inverter-driven motor on the mains frequency?

When operating at line frequency, the inverter is running at full load. It is similar to controlling the output using relays and contactors; the motor speed reaches the rated value, with the only difference being that the inverter introduces additional losses compared to the relay-based control method. It loses the meaning of using an inverter.

Variable-frequency motors perform better than conventional motors; they have lower iron loss and higher excitation efficiency, and they will not be damaged when powered by a mains frequency power supply. It can be used as a regular motor. This is my personal understanding for reference only.

There are no serious consequences; the reasons for using frequency converters are mainly two: one is the need for speed control, and the other is energy savings. If fixed-frequency power is used, the goal of speed control may not be achieved, and the device can only operate at a constant speed； Another issue is the poor energy-saving performance, especially for fan-type loads; when the air volume changes, it leads to excessive energy consumption.

First, let’s explain what power frequency electricity is. The power frequency is the usual frequency of mains electricity; in our area, it is 50 hertz. Power frequency is a very low frequency. The definition of high frequency varies across different application fields. For example, music orchestras use certain terms to describe sounds, dividing the frequency range of 20Hz to 20KHz into seven categories: very low frequency, low frequency, low-to-mid frequency, mid frequency, mid-to-high frequency, high frequency, and very high frequency. At this time, the high frequency range is approximately from 2560 Hz to 5120 Hz. 　　For example, the frequency of the variable-frequency air conditioners we use ranges from 50Hz to 30–130Hz, while the power supply voltage ranges from 142V to 270V. In industry, for example in transformers, what is a high-frequency electronic transformer? There is an exact definition for it: it is an electronic transformer that operates at a high frequency; generally, a frequency of over 20 kHz is considered high frequency. The frequency converter is mainly used for frequency conversion; by using the power frequency, it essentially replaces the frequency converter. 2#3# The explanation is correct. If done this way, is it a bit costly for the owner?

First, let’s explain what power frequency electricity is. The power frequency is the usual frequency of mains electricity; in our area, it is 50 hertz. Power frequency is a very low frequency. The definition of high frequency varies across different application fields. For example, music orchestras use certain terms to describe sounds, dividing the frequency range of 20Hz to 20KHz into seven categories: very low frequency, low frequency, low-to-mid frequency, mid frequency, mid-to-high frequency, high frequency, and very high frequency. At this time, the high frequency range is approximately from 2560 Hz to 5120 Hz. 　　For example, the frequency of the variable-frequency air conditioners we use ranges from 50Hz to 30–130Hz, while the power supply voltage ranges from 142V to 270V. In industry, for example in transformers, what is a high-frequency electronic transformer? There is an exact definition for it: it is an electronic transformer that operates at a high frequency; generally, a frequency of over 20 kHz is considered high frequency. The frequency converter is mainly used for frequency conversion; by using the power frequency, it essentially replaces the frequency converter. 2#3# The explanation is correct. If done this way, is it a bit costly for the owner?