Why does a fan make sound when operated on inverter?
This question always haunted me. Nowadays, loadshedding has been put in our area. We have inverter in the house. When the power goes, Inverter will get switched on.
We can put lights and fans with inverter running. But I observed when power is there, and when I switch on fan it runs smoothly. But when it is operated on inverter , it gives the sound. When the power is back, sound disappears. According to my knowledge, the reason is like this:
Inverter when it is charging i.e. when supply is there converts AC to DC and stores power. When the supply goes, it recharges the power. Now the interesting thing happens.
Inverter converts its stored power which is in DC to AC means now it acts like sine wave generator. Supply is always having pure sine wave at 50 Hz.
But a modified sine wave looks more squared than round. In real life, the modified sine wave are less powerful and the signal does not look as "perfect"as we get in our labs.Because of this, sharp edge arises in modified so called sine wave which are responsible for noise component.
modified sine wave has much more frequency content compared to a pure sine wave. Thus, we have a noise coming from a fan operated on inverter.
This question always haunted me. Nowadays, loadshedding has been put in our area. We have inverter in the house. When the power goes, Inverter will get switched on.
We can put lights and fans with inverter running. But I observed when power is there, and when I switch on fan it runs smoothly. But when it is operated on inverter , it gives the sound. When the power is back, sound disappears. According to my knowledge, the reason is like this:
Inverter when it is charging i.e. when supply is there converts AC to DC and stores power. When the supply goes, it recharges the power. Now the interesting thing happens.
Inverter converts its stored power which is in DC to AC means now it acts like sine wave generator. Supply is always having pure sine wave at 50 Hz.
But a modified sine wave looks more squared than round. In real life, the modified sine wave are less powerful and the signal does not look as "perfect"as we get in our labs.Because of this, sharp edge arises in modified so called sine wave which are responsible for noise component.
modified sine wave has much more frequency content compared to a pure sine wave. Thus, we have a noise coming from a fan operated on inverter.
No comments:
Post a Comment