Method for determining parameter values of an induction machine by means of polynominal calculations
First Claim
1. A method for determining parameter values of an induction machine by means of polynomial calculations, as performed by a dedicated computer system, comprising:
- sampling a voltage signal, a current signal and a rotational speed signal of the induction machine at a time the induction machine is started;
calculating a resistance and a reactance of the induction machine at each of a plurality of slip rates according to the voltage signal and the current signal;
calculating a plurality of coefficients of a polynomial fraction based on the resistances and the reactances;
calculating parameter values of an equivalent circuit according to the plurality of coefficients of the polynomial fraction, wherein the equivalent circuit comprises a stator resistance, a stator reactance and a magnetizing reactance that are connected in series to form an open loop, and wherein the equivalent circuit further comprises a rotor reactance and a rotor resistance that are connected to two ends of the magnetizing reactance to form a closed loop;
calculating a moment of inertia and a friction coefficient of the induction machine according to the calculated parameter values and the rotational speed signal of the equivalent circuit; and
outputting the moment of inertia and the friction coefficient of the induction machine,wherein the polynomial fraction is expressed as;
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Abstract
A method for determining parameter values of an induction machine. The method may be executed by a dedicated computer system. The method includes sampling a voltage signal, a current signal and a rotational speed signal of the induction machine at the time the induction machine is started, calculating a resistance and a reactance of the induction machine at each of a plurality of slip rates according to the voltage signal and the current signal, calculating a plurality of coefficients of a polynomial fraction based on the resistances and the reactances, calculating the parameter values of an equivalent circuit according to the plurality of coefficients of the polynomial fraction, calculating a moment of inertia and a friction coefficient of the induction machine according to the calculated parameter values and the rotational speed signal of the equivalent circuit, and outputting the moment of inertia and the friction coefficient of the induction machine.
65 Citations
9 Claims
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1. A method for determining parameter values of an induction machine by means of polynomial calculations, as performed by a dedicated computer system, comprising:
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sampling a voltage signal, a current signal and a rotational speed signal of the induction machine at a time the induction machine is started; calculating a resistance and a reactance of the induction machine at each of a plurality of slip rates according to the voltage signal and the current signal; calculating a plurality of coefficients of a polynomial fraction based on the resistances and the reactances; calculating parameter values of an equivalent circuit according to the plurality of coefficients of the polynomial fraction, wherein the equivalent circuit comprises a stator resistance, a stator reactance and a magnetizing reactance that are connected in series to form an open loop, and wherein the equivalent circuit further comprises a rotor reactance and a rotor resistance that are connected to two ends of the magnetizing reactance to form a closed loop; calculating a moment of inertia and a friction coefficient of the induction machine according to the calculated parameter values and the rotational speed signal of the equivalent circuit; and outputting the moment of inertia and the friction coefficient of the induction machine, wherein the polynomial fraction is expressed as; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining parameter values of an induction machine by means of polynomial calculations, as performed by a dedicated computer system, comprising:
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sampling a voltage signal, a current signal and a rotational speed signal of the induction machine at a time the induction machine is started; calculating a resistance and a reactance of the induction machine at each of a plurality of slip rates according to the voltage signal and the current signal; calculating a plurality of coefficients of a polynomial fraction based on the resistances and the reactances; calculating parameter values of an equivalent circuit according to the plurality of coefficients of the polynomial fraction; calculating a moment of inertia and a friction coefficient of the induction machine according to the calculated parameter values and the rotational speed signal of the equivalent circuit; and outputting the moment of inertia and the friction coefficient of the induction machine, wherein the moment of inertia and the friction coefficient are expressed as;
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Specification