Patent ID: 9219441
Filing Date: 2015-12-22
Classification: H02P

Abstract:
1. A magnet flux amount estimation device comprising: a magnetic pole position detector configured to detect a magnetic pole position of a permanent magnet synchronous motor including a permanent magnet within a rotor; an inductance-equivalent value determination module configured to determine an inductance-equivalent value of a d-axis corresponding to a determined magnetic pole direction; and a magnet flux amount estimator configured to calculate an estimation value of a magnet flux amount of the permanent magnet, based on the inductance-equivalent value, wherein the inductance-equivalent value determination module includes a module configured to calculate an inductance-equivalent value of the d-axis, by using a signal produced by pulse width modulation (PWM)-modulating a voltage instruction value for controlling a response current which is applied to the permanent magnet synchronous motor, a d-axis component of a response current which is supplied from an inverter for driving the permanent magnet synchronous motor to the permanent magnet synchronous motor, a carrier phase which is used for PWM modulation of the voltage instruction, and the magnetic pole position.