Comments by "SeanBZA" (@SeanBZA) on "Fans; High is next to Off on purpose" video.
-
@AaronSmart.online Ceiling fans are a definite must in the tropics and sub tropics ( so most of the EU, aside from those places around the Med, are out), and all of them I have met start off as high, medium and low. mostly because they tend to have bearing issues with time, and the bearings ( or bushings, depending on how old the fan is and who made it) will tend to become sticky with time, but so long as the fan is able to start turning they will run. Thus you start on high, to get the best chance of the bearing getting it's hydrodynamic film built up and thus reducing wear, as a slow moving bearing or bushing is going to have very high loss,, simply because of metal on metal contact.
In general the fans only start to give issues when older, and often I cure it with a new capacitor, as most ceiling fans I meet are not shaded pole types, but split phase. Bearings getting stiff it is possible to lubricate them, but often the housings are pressed together, making it hard to get to them for a good repair, and the modern trend is to use that horrid CCA wire as well.
The ones on my ceilings are around 20 years old, and still work well. The smaller fans almost all are split capacitor, though the old GE fan is rather odd, in that it achieved phase rotation by having variable reluctance in the pole pieces, using thinner sections of the poles to provide a saturating magnetic field. As the field saturates it appears to shift, allowing the fan to start as the field is moving, and not just varying with time, just like the shaded pole does, but without the need for the copper shorting coils to bring about the field saturation in the motor. higher starting torque simply because there is no circulating current in the pole pieces, so more energy available to induce a rotor current, plus the rotor is skewed, so there is a bias as to start direction built in.
Yes 230VAC country, currently ( amazingly) 233.2 VAC , though it can go up to 247VAC at times, but after they replaced the 90 year old transformer across the park (it started leaking from the base valve, so went for repair instead of just a new valve) the newer one ( still around 30 years old, they are refurbished because of the cost of new ones) is set more closely to 230VAC instead of the old one being 240VAC. I lived in a place with the original 130 year old 250VAC supplies, and there cooking was great, but appliance and lamp life was not, though your lamps were extra bright. That will never change, as they would have to replace over 50 transformers at once, so keep the taps on the low side instead to meet spec for high voltage.
15
-
1