# Inductance and ressitance values for Ceiling/pedestal fan single phase ac

Joined May 25, 2019
50
Hi everybody
I need to know how to roughly get idea about inductance value of ceiling /pedestal single phase, rated 230 V AC fan? I want to roughly model this.

#### Ramussons

Joined May 3, 2013
798
You said Roughly
Get a incandescent bulb across the mains.
Measure the Current and the Voltage.
You get the Resistance of the Bulb.

Put the bulb in series with the Fan
Measure the Voltages across the bulb and fan.
The fan has 2 windings, 1 connected thru a capacitor, likely 2.5 uF.
Measure voltages across each winding and capacitor.

Measure the Mains current.
Assume Line Frequency as 50 Hz

With the measured values, the inductance offered by the fan can be worked out.

Joined May 25, 2019
50
Sir
You said Roughly
Get a incandescent bulb across the mains.
Measure the Current and the Voltage.
You get the Resistance of the Bulb.

Put the bulb in series with the Fan
Measure the Voltages across the bulb and fan.
The fan has 2 windings, 1 connected thru a capacitor, likely 2.5 uF.
Measure voltages across each winding and capacitor.

Measure the Mains current.
Assume Line Frequency as 50 Hz

With the measured values, the inductance offered by the fan can be worked out.
Sir thankyou for your valuable response...
1) I had a 60watt incandascnt bulb so i can calculate resistance of bulb.
2) secndly I have pedestal sngl phase ac phase..We have only plug accessble to us for fan...we need to open box of fan for getting access to point where capacitor connects?
3) If after point 2,still we have only 3 terminals availble.one is common and other 2 a cap is cnctd betwen them.where to measure voltages?
4) after above how to calculate inductan e of fan?
5 ) How to calculate R component of fan?
6) pedestal fan is general 230vac rated sngle phase
Regards

#### crutschow

Joined Mar 14, 2008
24,041
The easiest way may to buy a wattmeter, such as this, and measure the power and power-factor of the fan.
From that you can calculate the equivalent resistance and inductance of the motor.

Joined May 25, 2019
50
The easiest way may to buy a wattmeter, such as this, and measure the power and power-factor of the fan.
From that you can calculate the equivalent resistance and inductance of the motor.
Sir how to find R and L from above values?
Regards

#### crutschow

Joined Mar 14, 2008
24,041

#### Ramussons

Joined May 3, 2013
798
I'm giving you a starting point for a graphical solution.

Joined May 25, 2019
50
I'm giving you a starting point for a graphical solution.

View attachment 182718
Sir after finding all these parameters how to proceed fr X and R from above parameters?
Regards

#### Ramussons

Joined May 3, 2013
798
You'll need to study something on Reactive and Real electrical parameters.

crutschow has given a very good lead on this. (post #6)