In the hot summer, fans are our right-hand helpers to cool down, and small capacitors play an indispensable role in this.
Most fan motors are single-phase AC motors. If they are directly connected to the mains, they can only generate a pulsating magnetic field and cannot start by themselves.
At this time, the starting capacitor comes on the scene, which is connected in series with the motor’s auxiliary winding. At the moment of power-on, the capacitor changes the current phase, causing a phase difference between the main and auxiliary winding currents, and then synthesizes a rotating magnetic field to drive the motor rotor to rotate, and the fan blades begin to rotate lightly, bringing a cool breeze, completing this “starting task”.
During operation, the fan speed must be stable and appropriate. The running capacitor takes over the control task. It continuously optimizes the current distribution of the motor winding, offsets the adverse effects of the inductive load, ensures that the motor runs stably at the rated speed, and avoids noise and wear caused by too fast speed, or insufficient wind force caused by too slow speed.
Not only that, high-quality capacitors can also improve the energy efficiency of fans. By accurately matching motor parameters and reducing reactive power loss, every kilowatt-hour of electricity can be converted into cooling power, which is both energy-saving and environmentally friendly.
From table fans to floor fans, from ceiling fans to industrial exhaust fans, capacitors are inconspicuous, but with their stable performance, they silently ensure the smooth operation of fans, allowing us to enjoy the comfortable cool breeze on hot days. They can be called the unsung heroes behind the fans.
Post time: Mar-21-2025