Methods for determining inductance and resistance of an inductor

A method for determining the inductance L of an inductor comprising the steps of:

• a) connecting a resistor in series with the inductor, wherein the resistor has a resistance of Rs;
• b) applying an alternating voltage across the series-connected resistor and inductor, wherein the alternating voltage has a frequency ω, a unique maximum or minimum value Vm, an average value and a unique crossover of the average value;
• c) measuring the voltage Vr across the resistor when the alternating voltage is at its maximum or minimum value;
• d) measuring the voltage Vl across the resistor when the alternating voltage is at its average value;
• e) calculating the resistance RL of the inductor from an equation in which RL is a function of Vm, Vr, Rs, and Vl and
• f) calculating the inductance L of the inductor from an equation in which L is a function of Vl, Rl, Rs, Vr and ω.

A method for determining the resistance RL of an inductor comprising the steps of:

• a) connecting a resistor in series with the inductor, wherein the resistor has a resistance of Rs;
• b) applying a sinusoidal voltage across the series-connected resistor and inductor, wherein the sinusoidal voltage has a frequency ω, a maximum or minimum value Vm and an average value;
• c) measuring the voltage Vr across the resistor when the sinusoidal voltage is at its maximum or minimum value;
• d) measuring the voltage Vl across the resistor when the sinusoidal voltage is at its average value;
• and
• e) calculating the resistance RL of the inductor from the following equation:
• RL=VmVrRs/(Vr2+Vl2)−Rs.

A method for determining the resistance RL of an inductor comprising the steps of:

• a) connecting a resistor in series with the inductor, wherein the resistor has a resistance of Rs;
• b) applying an alternating voltage across the series-connected resistor and inductor, wherein the alternating voltage has a frequency ω, a unique maximum or minimum value Vm, an average value and a unique crossover of the average value;
• c) measuring the voltage Vr across the resistor when the alternating voltage is at its maximum or minimum value;
• d) measuring the voltage Vl across the resistor when the alternating voltage is at its average value;
• and
• e) calculating the resistance RL of the inductor from an equation in which RL is a function of Vm, Vr, Rs and Vl.