Patent ID: 8278849
Filing Date: 2012-10-02
Classification: G01R,H02P

Abstract:
1. A controller of an industrial machine provided with an electric motor, a peripheral apparatus and an amplifier driving the electric motor, comprising: a motor power-consumption calculation section calculating motor power consumption of the electric motor by multiplying a motor current detection value, a motor rotation-speed detection value and a predetermined motor torque constant together; a power loss calculation section calculating sum power loss of the electric motor and the amplifier by adding motor power loss determined by multiplying a square of the motor current detection value by a predetermined motor winding-resistance value, amplifier power loss determined by multiplying the motor current detection value by a predetermined amplifier power-loss coefficient, and predetermined fixed amplifier power consumption together; a fixed power-consumption calculation section calculating fixed power consumption of the peripheral apparatus; and a total power-consumption calculation section determining total power consumption of the industrial machine in a predetermined time period by integrating, for said predetermined time period, said motor power consumption calculated by said motor power-consumption calculation section, said sum power loss calculated by said power loss calculation section, and said fixed power consumption calculated by said fixed power-consumption calculation section, wherein said motor power-consumption calculation section calculates said motor power consumption by decomposing the motor current detection value into a Q-phase current value in a direction of a q-axis orthogonal to a rotor magnetic flux and a D-phase current value in a direction of a d-axis coinciding with a direction of the rotor magnetic flux, and multiplying the Q-phase current value, the motor rotation-speed detection value and the predetermined motor torque constant together.