Patent ID: 8866429

Claim:
A power-saving driving device for a device that is driven by a motor receiving electric power from an inverter and that has a same load pattern, wherein the power-saving driving device comprises: (a) a voltage measuring device that measures a voltage received by the inverter; (b) a current measuring device that measures a current received by the inverter; (c) an electric power amount calculator that calculates, based on the measured voltage and the measured current, a received electric power amount that is received by the inverter in the same load pattern; and (d) a parameter selection and command device that makes a parameter or parameters of the inverter change to a plurality of values in respective cycles having the same load pattern, wherein the parameter selection and command device compares with each other a plurality of the received electric power amounts respectively corresponding to the plurality of values of the parameter or parameters and respectively corresponding to the respective cycles, and the parameter selection and command device selects, from the plurality of values, a first parameter value corresponding to the lowest of the plurality of the received electric power amounts respectively calculated based on the measured voltages and the measured currents, and issues the selected first parameter value as a command to the inverter.