Patent ID: 8040097

Claim:
A servo motor drive control device controlling servo motors of a mechanical system, said mechanical system including a plurality of amplifier groups each having a common power source unit connected to a higher-level power source and a plurality of power supply units for supplying power to the servo motors from the common power source unit, said servo motor drive control device further comprising: an individual electric power detection unit determining, at every predetermined period, an individual periodic electric energy representing an electric energy of the servo motor operating in that period; and an amplifier group electric power detection unit determining an electric energy of each of the amplifier groups, wherein the individual periodic electric energy takes a positive value when the servo motor consumes electric power and takes a negative value when the servo motor regenerates electric power; and wherein each amplifier group electric power detection unit totals the individual periodical electric energy of the servo motors connected to the power supply units associated with the amplifier group corresponding to each amplifier group electric power detection unit thereby to determine an amplifier group periodic electric energy representing a consumed electric energy or a regenerated electric energy in the corresponding amplifier group and integrates the determined amplifier group periodic electric energy over a predetermined time length thereby to determine an amplifier group consumed electric energy representing a total consumed electric energy in the amplifier group during the predetermined time length, and wherein each amplifier group electric power detection unit integrates the amplifier group periodic electric energy, only when the amplifier group electric energy is negative, over the predetermined time length thereby to determine an amplifier group regenerated electric energy representing a total sum of the regenerated electric energy in the amplifier group corresponding to the amplifier group electric power detection unit for the predetermined time length.