MAGNETIC POLE POSITION ESTIMATING METHOD AND ESTIMATOR, AND INVERTER CONTROL METHOD AND CONTROLLER

摘要

PROBLEM TO BE SOLVED: To reduce error of the magnetic pole position of a motor efficiently when it is estimated.

SOLUTION: As a first step, a first estimating means 1A obtains a first estimated value θ^ef1of magnetic pole position. In this regard, an original estimating section 2 obtains the original estimated value θ^e1of magnetic pole position and a filter 3 filters the original estimated value θ^e1. As a second step, a sample/hold element 4a at a sample/hold section 4 obtains a second estimated value θ^e2of magnetic pole position. As a third step, a sample/hold element 4b obtains a first estimated value θ^ef1for current 0, and an adder/subtractor 12 obtains an estimated value Δθ^eof error. As a fourth step, q-axis inductance estimated value L^qof the motor is updated. The first estimated value θ^ef1can be brought close to a true value by repeating the first through fourth steps using an updated q-axis inductance estimated value L^q.

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