초록 ▼

A method and system for determining an inductance value of an inductive element are presented. The method includes energizing the inductive element using an N-pulse AC to DC converter in electrical communication with the inductive element and an AC source. The method further includes determining at

A method and system for determining an inductance value of an inductive element are presented. The method includes energizing the inductive element using an N-pulse AC to DC converter in electrical communication with the inductive element and an AC source. The method further includes determining at each of a plurality of periodic time intervals an inductive element voltage value, an inductive element current value, and an equivalent source phase angle. An Nth harmonic impedance squared value is then determined for the inductive element using the inductive element voltage and current values and the equivalent source phase angles. The inductive element inductance value is then calculated using the Nth harmonic impedance squared value and an AC source frequency value.

대표청구항 ▼

1. A method of determining an inductance value of an inductive element, the method comprising: energizing the inductive element using an N-pulse AC to DC inductive element converter in electrical communication with the inductive element and an AC source; determining at each of a plurality of per

1. A method of determining an inductance value of an inductive element, the method comprising: energizing the inductive element using an N-pulse AC to DC inductive element converter in electrical communication with the inductive element and an AC source; determining at each of a plurality of periodic time intervals an inductive element voltage value, an inductive element current value, and an equivalent source phase angle; determining an Nth harmonic impedance squared value for the inductive element using the inductive element voltage and current values and the equivalent source phase angles; and calculating the inductive element inductance value from the Nth harmonic impedance squared value and an AC source frequency value. 2. A method according to claim 1 further comprising de-energizing the inductive element after a time interval no greater than a predetermined number of cycles of the AC source. 3. A method according to claim 1 wherein the inductive element inductance value is determined using the relationship: where N=a number of converter pulses per source AC cycle; Lind=inductive element inductance value; Z(N)2=Nth harmonic impedance squared; and .function.=AC source frequency. 4. A method according to claim 1 wherein the step of determining an Nth harmonic impedance squared value includes: calculating an Nth harmonic inductive element voltage squared value from the inductive element voltage values and the equivalent source phase angles; calculating an Nth harmonic inductive element current squared value from the inductive element current values and the equivalent source phase angles; and calculating the Nth harmonic impedance squared value from the Nth harmonic voltage squared value and the Nth harmonic current squared value. 5. A method according to claim 4 wherein the Nth harmonic impedance squared value is determined using the relationship: where N=a number of converter pulses per source AC cycle; Z(N)2=Nth harmonic impedance squared; V(N)2=Nth harmonic inductive element voltage squared; and I(N)2=Nth harmonic inductive element current squared. 6. A method according to claim 4 wherein the Nth harmonic inductive element voltage squared is determined using the relationship: V(N)2=[Σi=0i=m[Vicos(min2π(Nαi))]]2+[Σi=0i=m[Visin(mod2π(Nαi))]]2;