Abstract: A magnetic pole position detection device of a permanent magnet-type synchronous motor detects, through a current draw-in operation, an amount of deviation between an origin of a magnetic pole position of a permanent magnet that makes up a rotor of a permanent magnet-type synchronous motor, and an origin of an output signal of a magnetic pole position sensor, and correcting the output signal of the magnetic pole position sensor on the basis of the amount of deviation, to thereby detect a true magnetic pole position. The detection device computes a phase current Ia and computes a d-axis current from the phase current Ia. The current draw-in operation is performed by causing the d-axis current to flow through armature windings of the motor, to thereby draw the rotor to the magnetic flux axial direction.

Abstract: A magnetic pole position detection device of a permanent magnet-type synchronous motor detects, through a current draw-in operation, an amount of deviation between an origin of a magnetic pole position of a permanent magnet that makes up a rotor of a permanent magnet-type synchronous motor, and an origin of an output signal of a magnetic pole position sensor, and correcting the output signal of the magnetic pole position sensor on the basis of the amount of deviation, to thereby detect a true magnetic pole position. The detection device computes a phase current Ia and computes a d-axis current from the phase current Ia. The current draw-in operation is performed by causing the d-axis current to flow through armature windings of the motor, to thereby draw the rotor to the magnetic flux axial direction.