I just removed the motor from a floor fan; a few questions regarding single-phase asynchronous motors
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1. The motor that has been disassembled is a capacitor-start asynchronous motor. In this type of motor, the starting winding remains connected after startup; what are the effects of either keeping the starting winding connected or disconnecting it? 2. The rated input power of the motor is indicated as 60W. Is it true that the output power is highest in the high-speed gear, approaching the rated input power, and that the motor efficiency is at its highest at this time? 3. How can the rated input power of a motor be changed? What is the difference between what is commonly referred to as high-power motors and these low-power motors?
1. In previous motors, the starting winding was de-energized after startup, but in modern motors it remains energized, with virtually no impact. 2. At higher levels, the output power is the highest, but the efficiency is not necessarily so. 3. This type of motor changes the input power by altering the wiring configuration of its windings; high-power motors are all 380V, which is different from 220V.