Motor driving apparatus, and initial driving method for three-phase motor

Abstract

The present invention relates to a method of driving a three-phase electric motor, comprising measuring a three-phase excitation current by selectively exciting two phases; calculating a current difference between excitation phase currents having the same phase; classifying the current difference according to variation; and calculating a rotator position in the three-phase motor on the basis of a classification result and the magnitude of the excitation phase current. Thus the present invention provides an electric motor driving apparatus and a driving method which can be applied to various kinds of motors and which precisely measures an initial position of the rotator.

Dependencies are inferred from the claim text.