Inverter driven exhaust/cooling fan
In the first place, I didnt want to change the motor this early because I have been so short of resource that I wanted to go on with what I had.
But the incident happed one day when I was checking the gap between the cooling and roasting switch lever flap my finger touched something hard. It was obviously the exhaust / cooling fan that rotating 1720 times per minute. In that instant, I thought my finger would be torn or lost never to recover. Can you imagine what have happend? Instead of tearing my finger THE FAN STOPPED!! It really did and I judged then realized that the assist of the 140W DC fan at the end of cyclone may not be enough and this faint moter has to be replaced.
ie.) Later, I changed some settings; PWM frequency upto 14.5 khz it became so quiet at 50/60hz operation. With its full power it loudly claims its exsistance but even at 90hz it is really smooth and muted. Amazing!!
