1. Speed detection: The frequency converter detects the speed of the motor through an encoder or sensor installed on the motor shaft. The encoder generates a series of pulse signals, and the frequency converter can obtain the speed information of the motor by counting and analyzing these signals.
2. Speed control: Based on the user's set value and required speed, the control circuit calculates the output frequency and voltage of the inverter. The output frequency is proportional to the rotational speed, while the output voltage depends on the demand of the load. The control circuit will adjust the output frequency and voltage of the inverter based on the difference between the actual speed detected by the speed and the set value, so that the actual speed approaches the set value.
3. Motor control: The inverter supplies the output AC power to the motor and controls its speed. The frequency converter adjusts the voltage and frequency to change the rotational speed and direction of the magnetic field inside the motor, thereby controlling the speed. The change in frequency directly affects the speed of the motor, while the change in voltage affects the load capacity of the motor.
4. Stability adjustment: In order to improve the performance and stability of the frequency converter, the control circuit will also adjust and correct the output voltage and frequency. This can ensure the accuracy of the motor speed, while also protecting the motor from issues such as overcurrent and overload.