Introduction to electrical machine drives control

For more than a century, electrical machine drives have been powering production processes for numerous industries. Applications include pumping, ventilation, compression, milling, crushing, grinding, conveying, and transporting. Modern electrical drive technology is beginning to offer more cost‐effective solutions with excellent speed control, making it possible to significantly improve efficiencies and minimize power consumption. These developments will encourage the replacement of polyphase current (AC) motor systems in existing applications and the implementation of modern electrical drives for any new ones. Electrical machine drives can be categorized as either noncontrolled or controlled motor or generator drives. Instrumentation monitors the state of the motor by measuring critical parameters such as rotation speed, electric current, and operating temperature. Controlled electrical drives improve energy efficiencies by more accurately controlling process energy flow. In industrial processes, effective speed or torque control is necessary to achieve reasonable energy consumption and high quality.