Feedback unit suppliers remind you: Variable-frequency Drive (VFD) controls the speed and operation of the motor by adjusting the frequency and amplitude of the output voltage. Specifically, VFD controls the speed of the motor mainly through the following steps:
Input signal acquisition: The VFD first collects input signals from the control system or the operating panel, including parameters such as required speed settings, operating modes, etc.
Speed calculation: Based on the input signal and the internal control algorithm of the VFD, the VFD calculates the speed at which the motor should currently run.
Generate PWM signals: Based on the calculated speed, the VFD generates the corresponding PWM (pulse width modulation) signal.
Pulse Width Modulation: The PWM signal passes through the pulse width modulation module and converts it into a series of pulse signals. The width and interval of the pulse can be controlled according to the desired rotational speed.
Output voltage adjustment: The pulse signal through the output circuit adjusts the amplitude and frequency of the output voltage of the VFD. The frequency of the output voltage is the desired speed.
Power motor: The output voltage is supplied to the motor through the output port of the VFD. The motor runs at the corresponding speed according to the voltage and frequency provided by the VFD.
By constantly adjusting the frequency and amplitude of the output voltage, the VFD can achieve precise speed control to meet the needs of different working conditions and improve the operating efficiency and control accuracy of the motor.