Patent ID: 7813904
Filing Date: 2010-10-12
Classification: G06F,H02P

Abstract:
1. A computer implemented method of modeling control of an electric motor using a model of a motor, the method using a motor model which is defined by an equation on a stationary coordinate system, the stationary coordinate system specifying a state of an alternate-current motor which comprises a rotor for generating a magnetic-field flux φr and a stator with multiple-phase armature coils wound therearound, said equation including at least a multiple-phase armature current i and a multiple-phase armature voltage U as variables thereof, and the method comprising the steps of: formulating, utilizing the computer, a motor model in which the inverse matrix of an inductance matrix L(θ), which is a predetermined function whose variable is a rotary angle θ, is converted into a matrix λ(θ), which is a function whose variable is the rotary angle θ; and computing, utilizing the computer, the matrix λ(θ) to compute the value of the inverse matrix of the inductance matrix L(θ), and feeding the value of the inverse matrix into the equation, which makes said motor model, thereby obtaining resultant values, wherein the inductance matrix L(θ) is a matrix of inductances of multiple-phase armature coils, the inductances specifying a relationship between a current magnetic flux φs, which is an armature-coil flux linkage resulting from the multiple-phase armature current i, and the multiple-phase armature current i, and wherein the inverse matrix of the inductance matrix L(θ) is computed by means of computing said matrix λ(θ) based on a d-axis inductance Ld of said alternate-current motor, a q-axis inductance Lq of the alternate-current motor and a leakage inductance Ll thereof.