Capacitor Type Fan Controls

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Capacitor type fan controls.

Capacitor controls are commonly identified by having 3 or 4 distinct speeds instead of infinitely variable speed selection. Starting winding is also known as auxiliary winding while running windings is known as main winding. Capacitors capacitors control the flow of power to a fan motor. You can change the resistance by rotating the knob.

Most capacitor type controls can only operate one fan per control so multiple fans require multiple controls. For instance if you set a wall switch to 33 percent power the capacitor supplies the motor an appropriate amount of electricity. This type of regulator helps you to save power at all speeds of the fan. A capacitor receives 100 percent of the power supplied from a power source to a fan motor and meters how much of that power the motor actually receives.

Ceiling fan motor circuit diagram. Generally the ceiling fan motors are split phase single phase ac motors. The regulating unit is visible as a much smaller knob compared to those of conventional resistors. Below is the circuit diagram of split phase induction motor in a ceiling fan clearly showing a capacitor connected in series with the starting winding auxiliary winding.

A start or run capacitor can be combined into one capacitor called a dual capacitor with three leads but can be split between two separate capacitors. You can overcome this problem by using capacitor regulators. The start capacitor gives a fan motor the torque it needs to start spinning then stops.