Patent ID: 8120299
Filing Date: 2012-02-21
Classification: F24F,H02M

Abstract:
1. A motor controller of an air conditioner, comprising: an inverter, including a plurality of switching elements, adapted to convert a DC voltage, input through switching operations of the switching elements, into an AC voltage and supply the converted voltage to a motor; a power calculation unit adapted to calculate a value of electric power applied to the motor; an angle calculation unit adapted to calculate an optimal phase angle of a current command value based on the calculated value of electric power; and a microcomputer adapted to output an inverter switching control signal to control the switching elements of the inverter based on the optimal phase angle, and wherein the microcomputer comprises: an estimation unit adapted to estimate a velocity based on output current flowing through the motor; a current command generator adapted to generate d,q-axis current command values based on the estimated velocity, a velocity command value, and the optimal phase angle; a voltage command generator adapted to generate d,q-axis voltage command values based on the d,q-axis current command values and the output current; and a switching control signal output unit adapted to output the inverter switching control signal based on the d,q-axis voltage command values.