Brushed Permanent Magnet DC Motors
Abstract
This chapter introduces electromechanical modeling of brushed permanent magnet DC motors. Topics covered include the Lorentz force law, brushed commutation, motor equations, the speed-torque curve, and fundamental motor characteristics such as the torque constant, the motor constant, the electrical constant, the speed constant, the maximum continuous torque and current, the no-load speed and current, the stall torque and current, the electrical time constant, the mechanical time constant, and motor efficiency. The reader will learn how to read a motor’s data sheet and how to take an unknown brushed DC motor and perform experiments to determine most of the entries of its data sheet.
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