Patent Document ID: 20090157370
Application ID: 11719605
Patent Flag: 0

Claim One:
1. A computing method of motor model, the computing 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 computing method comprising the steps of: formulating 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 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 desirable variable values.