Apparatus for controlling permanent-magnet rotary machine

Electricity: motive power systems – Synchronous motor systems

Reexamination Certificate

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Details

C318S701000, C318S702000, C318S805000, C318S254100

Reexamination Certificate

active

06984957

ABSTRACT:
While a rotor4of a permanent-magnet rotary machine1is rotating and an armature current thereof is substantially zero, a motor controller2performs a dq vector control process to control the permanent-magnet rotary machine1in a dq coordinate system which has a d-axis representing the direction of a magnetic field of the rotor4and a q-axis representing a direction perpendicular to the d-axis, and determines a magnetic pole position correcting quantity θofs to correct a magnetic pole position θact detected by a magnetic pole position detector8so that a d-axis voltage command value Vdc determined by the dq vector control process will be substantially zero. The motor controller2controls the phases of armature voltages Vuc, Vvc, Vwc with magnetic pole positions corrected by the magnetic pole position correcting quantity θofs. Irrespective of whether the rotary machine1is a cylindrical machine or a salient-pole machine, the detected values of magnetic pole positions are appropriately corrected according to a simple process without the need for a voltage detector for thereby efficiently controlling operation of the permanent-magnet rotary machine1.

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