Everything you need to know about inverters

As we all know, the inverter is a refined machine composed of multiple electrical components. Because the multi-style and rich accessories bring many different characteristics to the inverter, what basic knowledge points do you need to know about the inverter?

1. What is the difference between PWM and PAM

PWM is the abbreviation of Pulse Width Modulation (Pulse Width Modulation) in English. It is a modulation method that changes the pulse width of the pulse train according to a certain rule to adjust the output and waveform. PAM is the abbreviation of Pulse Amplitude Modulation (Pulse Amplitude Modulation) in English. It is a modulation method that changes the pulse amplitude of the pulse train according to a certain rule to adjust the output value and waveform.

2. How does the torque of the motor change when V and f are changed proportionally?

When the frequency drops, the voltage is completely proportionally reduced, then the AC impedance becomes smaller and the DC resistance remains unchanged, which will cause the torque generated at low speeds to have a tendency to decrease. Therefore, given V/f at low frequency, it is necessary to increase the output voltage to obtain a certain starting torque. This compensation is called enhanced starting. It can be achieved by various methods, such as automatic method, selection of V/f mode, or adjustment of potentiometer.

3. What does the stall prevention function mean?

If the given acceleration time is too short, the change of the output frequency of the inverter far exceeds the change of the rotation speed (electric angle frequency), the inverter will trip due to the overcurrent flowing, and the operation will stop, which is called stall. In order to prevent the motor from stalling and continue to run, it is necessary to detect the magnitude of the current for frequency control. When the acceleration current is too large, the acceleration rate is appropriately slowed down. The same is true when slowing down. The combination of the two is the stall function.

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