: Adding resistance to the armature circuit.

Moberg masterfully explains the concept of "constant horsepower" region. By reducing the field current, you increase the motor speed beyond its rated RPM, though torque drops proportionally.

In conclusion, "AC and DC Motor Control" by Gerald Moberg is a comprehensive guide to motor control systems. The book covers a range of topics related to motor control, including DC and AC motor control, motor control devices, and control circuits. The book is a valuable resource for electrical engineers, technicians, and students who want to gain a deeper understanding of motor control systems.

The PWM technique allows for efficient control of the motor's speed, as the motor's inertia helps to filter out the high-frequency switching. By adjusting the duty cycle, the motor's speed can be controlled.

Moberg’s work was often published internally by Rockwell. Check the on Rockwell Automation’s official website. Search for "Moberg" or "DC Motor Control Manual." Sometimes old training manuals (Publication REB-1.x) are exact reprints of his work, available as free PDFs.

: Explanations of how official codes relate to field installation and design. Operational Techniques