METHOD AND APPARATUS FOR CONTROLLING SYNCHRONOUS MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling a synchronous motor wherein transition from non-self-controlled operation to self-controlled operation is smoothly carried out without a position detecting circuit.

SOLUTION: The method for controlling a synchronous motor is such that virtual computation is carried out based on current information from the synchronous motor in non-self-controlled operation, and this computation is repeated until the phase angle error between a command value of self-controlled operation voltage and a command value of non-self-controlled operation voltage converges. The virtual computation is for adjusting an initial voltage command so that voltage is not interrupted in transition from non-self-controlled operation to self-controlled operation.

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