Patent ID: 7573227
Filing Date: 2009-08-11
Classification: H02P

Abstract:
1. A controller of a permanent magnet type rotary motor, the controller comprising: a permanent magnet type rotary motor including a rotator which has a permanent magnet and a stator which has an armature generating a rotating magnetic field for rotating the rotator; a magnetic pole position detector detecting a magnetic pole position of the rotator; a current controller setting a phase of an armature voltage applied to the armature depending on the magnetic pole position and controlling an armature current flowing in the armature by a vector control using a rotatory magnetic flux coordinate in which a field direction of the rotator is defined as a field axis and a direction perpendicular to the field axis is defined as a torque axis; a current difference calculator decomposing a primary voltage difference which is a difference between a primary voltage of the permanent magnet type rotary motor and a maximum voltage corresponding to a source voltage, into a field-axis voltage difference component and a torque-axis voltage difference component in the rotatory magnetic flux coordinate by the use of a phase angle of the primary voltage, and calculating a field-axis current difference component and a torque-axis current difference component in the rotatory magnetic flux coordinate by the use of the voltage difference component, a field-axis inductance, and a torque-axis inductance; and a target current corrector correcting a field-axis target current and a torque-axis target current in the rotatory magnetic flux coordinate so that the current difference components are zero.