I'm interested in the technical reasons behind why an inexpensive ceiling fan in a home would hum, such that when in your bedroom above your bed on low speed is annoying.
Is there a better type of electrical motor to look for? My existing fan when new basically did not hum and was satisfactorily quiet at night when on low speed. Now ~5+ years later it is awful.
All I really know is it's a 120VAC brush less electric motor, can run on 3 speeds (low/med/hi).
What causes this kind of hum specifically? And is there a way to get a ceiling fan with a specific type of motor that would not be susceptible to a droning hum when on low speed?