Inverter acoustic noise
Inverter acoustic noise
(OP)
The 3 phase inverter is operating at 7KHz. When it starts, it begins to produce acoustic noise even no load is connected. It's coming from rectifier or inverter section i think; i couldn't exactly detect the source of the noise. Is this usual? What may cause this and how can i eliminate it?
Note: It's a home made inverter.
Note: It's a home made inverter.





RE: Inverter acoustic noise
RE: Inverter acoustic noise
RE: Inverter acoustic noise
RE: Inverter acoustic noise
But let me try to provide answers on the further questions.
Dead time is the time provided by the control unit to avoid short circuit within a phase leg. This time usually is choosen by the engineer designing the drive so that short circuits are avoided under worst case conditions.
The delay time of the drivers and the IGBTs have to be considered, distinguising between turn on and turn off. Usually ample safety margin is provided.
But if, for a given switching frequency, the dead time is set to high this will result in loosing headroom for modulation and, more severe, instable operation of induction motors under V/f control or nonlinearities in more sophisticated control schemes.