Celling Fan Wiring Diagram with Capacitor Connection

How Wiring a Celling Fan with Capacitor Connection?

Celling Fan Wiring Schematic Diagram
Fig: Celling Fan Wiring Diagram with Capacitor Connection
In the above schematic wiring diagram of a celling fan shows the very simple and easy external connection that connection of celling fan, fan speed regulator, ON/OFF switch with single phase power supply at home.

Also, shown the internal connection of running coil/winding, starting coil/winding and capacitor.


Why Capacitor is Required in a Celling Fan Connection?

A motor need two windings, main winding to run the motor and astarting winding to start the motor. 

Ceiling fan is a single phase induction motor, which doesn't have the property of self starting. For a single phase AC motor 2 separate phases are required to produce a rotating MMF(Magnetomotive Force) which in turn rotates the rotor. 

But, common household electricity supply consists of only one phase. So, we must introduce a circuit which produces the second phase. 

Ceiling fan contains two winding, a starting winding and a running winding. capacitor is connected in series with starting winding. 

When energized, the starting winding creates a phase difference which leads approx.90 degree with respect to running winding and thereby creates a starting torque.

When capacitors or inductors are involved in an AC circuit, the current and voltage do not peak at the same time i.e. they produce a phase difference in the waveform.

As inductors have a high AC resistance, capacitors are used to produce second phase in the starting winding. Such motors are called the capacitor start motors.

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Why Ceiling Fan Rotate in Reverse Direction?

The answer of this question should know everyone to solve the problem; the answer of the  question is simple-
 “If capacitor is connected with running winding or main coil instead of starting winding orauxiliary coil then the direction of rotation will changed", Fan will rotate in reverse. 

That’s mean if you want to change the direction of rotation of the fan, just connect the capacitor with other winding.

How Choose The Capacitor for Celling Fan?

The capacitor choosing depends on celling fan capacity and the fan operating voltage.

Generally 3 types voltage level is considered
  1. Low level: 110/125 Volt;
  2. Medium Level: 200/250 Volt;
  3. High Level: 280/350 Volt.


On the other hand fan capacity normally 0.93 KW to  0.746 KW or 1 HP.

No need any expert, follow the selection table and choose your fan capacitor.

Table for fan motor capacitor selection:
Fan Motor Size (KW)
Typical Capacitor Value (µF)
110/125 Vac (Vrms.max 150)
200/250 Vac (Vrms.max 275)
280/350 Vac (Vrms.max 350)
0.093
100/130
20/30
26/37
0.124
120/150
30/40
37/51
0.186
160/200
40/70
51/68
0.249
240/230
60/80
68/90
0.373
320/400
80/110
90/115
0.560
400/500
108/140
105/130
0.746
500/580
138/182
130/165

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