Patent ID: 7725062

Claim:
A drive control unit for controlling speeds of a plurality of motors based on a target speed, comprising: a detecting part configured to detect speed fluctuations of each of the motors when the speeds of the motors are controlled based on a common target speed; a storage part configured to store speed fluctuation profiles of each of the motors created based on the detected speed fluctuations for each of the motors; an extracting part configured to extract a speed fluctuation profile of a motor having a speed fluctuation profile with a largest amplitude of the speed fluctuation profiles for each of the motors stored in the storage part; a calculating part configured to calculate a difference profile between the extracted speed fluctuation profile and a speed fluctuation profile of a motor which is a speed control target and is different from the motor having the extracted speed fluctuation profile; a setting part configured to set the calculated difference profile as a new target speed for the motor which is the speed control target; and a control part configured to control the speed of the motor which is the speed control target based on the new target speed.