INPUT POWER ESTIMATION METHOD OF THREE 3-PHASE INVERTER FOR HIGH EFFICIENCY OPERATION OF AC MOTOR

摘要

In a method of estimating the input power from the alternating current motor drive system including a three-phase inverter according to an embodiment of the present invention, a cycle voltage-modulated based on a switching pattern of the switching element the three-phase inverter (T _S) the average input current (i _dc-avg) phase and the calculated average input current to calculate _{the-multiplied} by the input voltage (V _dc) to (i _dcavg) comprises the step of estimating the average input power (P _in). According to the present invention, it is possible to estimate the input power without an input current sensor using the phase current information of the motor and the switching pattern of the inverter, and more accurate by reflecting the error due to the dead time of the inverter in the estimated input power value can be obtained, and reliability can be improved.