dexterbot80 wrote: ↑Thu Apr 20, 2023 2:54 pm
Hello,
I found this project and I think it would help me to build a VFD for a three-phase motor.
https://github.com/jsphuebner/inverter- ... board6.pdf
I don't need sensors - I use it for a fan.
Can someone help me start the inverter without the current sensors?
I would just like to be able to change the motor speed from a potentiometer.
Thank you teachers
You can follow these steps. First, ensure you have the right power supply for your motor. Then, create an inverter stage using power electronic components like IGBTs or MOSFETs. This stage will convert the fixed AC input into variable-frequency AC output. Next, use a potentiometer as a speed control input and connect it to a control circuit, such as a microcontroller or control IC. This circuit will generate the appropriate frequency signals for the inverter based on the potentiometer input. Design a drive circuit to interface between the control circuit and the inverter, providing the necessary gate drive signals to the power electronic switches. Consider adding basic protection elements, like fuses or overcurrent relays, to ensure motor safety. Finally, test and calibrate the VFD to ensure it functions correctly and adjust as needed.
How to start the old inverter board without external sensors?
