Patent ID: 9160267
Filing Date: 2015-10-13
Classification: H02P

Abstract:
1. An AC motor control apparatus for a system, which includes a three-phase AC motor having a first phase, a second phase and a third phase, and a current sensor for sensing a current flowing in the first phase, the AC motor control apparatus comprising: a controlling part configured to control power supply to the AC motor, wherein the controlling part includes a current estimating part configured to calculate a current phase angle of the first phase as a reference, based on an α-axis current and a β-axis current in a fixed coordinate system defined by an α-axis and a β-axis, which are in a same direction as the first phase and perpendicular to the first phase, respectively, and calculate an estimated current of at least the second phase other than the first phase based on a calculated current phase angle of the first phase and the sensed current of the first phase, and wherein the current estimating part is further configured to calculate the α-axis current and the β-axis current based on the sensed current of the first phase and a command current of at least the second phase.