Drive controller of operating machine

A drive controller of an operating machine configured to drive a structure by a hydraulic motor and an electric motor configured to cooperate with the hydraulic motor, the hydraulic motor being supplied with hydraulic oil from a hydraulic pump through a hydraulic motor circuit, a flow rate of the hydraulic oil being controlled by a control valve,

• the drive controller comprising:
• a remote control valve configured to determine an operation amount of the structure;
• an electric motor torque calculation portion configured to calculate torque of the electric motor;
• a hydraulic motor torque calculation portion configured to calculate torque of the hydraulic motor;
• a controller configured to output an opening position control signal based on the operation amount determined by the remote control valve, the opening position control signal being output to operate the control valve such that torque necessary to drive the structure is obtained from the torque of the electric motor and the torque of the hydraulic motor;
• and
• a solenoid-operated reducing valve configured to reduce pilot pressure, to be applied to the control valve, based on the opening position control signal output from the controller.