Patent ID: 8884565
Filing Date: 2014-11-11
Classification: H02M,H02P

Abstract:
1. A motor driving device comprising: a single DC conversion unit that converts input AC into DC; a plurality of AC conversion units that convert DC output from said DC conversion unit into AC supplied to a plurality of motor units as driving electric power; an electric power consumption calculation unit of the DC conversion unit that calculates electric power consumption of the DC conversion unit from input voltage and input current to said DC conversion unit under desired operating conditions or circumstances every predetermined time period; and a maximum output calculation unit of the DC conversion unit that extracts an eventual maximum value from said electric power consumption of the DC conversion unit calculated every said predetermined time period and outputs the extracted eventual maximum value as a maximum output of the DC conversion unit, wherein the single DC conversion unit is selected from among a plurality of DC conversion units by choosing one of the plurality of DC conversion units as the single conversion unit which outputs said maximum output of the DC conversion unit under said desired operating conditions or circumstances, wherein said maximum output calculation unit of the DC conversion unit corrects said calculated maximum output of the DC conversion unit by using correction parameters and outputs the corrected maximum output of the DC conversion unit such that the corrected maximum output of the DC conversion unit is larger than an actual maximum output by at least one of multiplication and addition.