Electric Motors: “DC Motors and Generators” pt3-3 1961 US Army Training Film

more at scitech.quickfound.net “DC MOTORS AND GENERATORS… DESIGN, APPLICATION, AND OPERATION OF BASIC, SERIES, SHUNT, AND COMPOUND WOUND TYPE DC GENERATORS AND MOTORS.” US Army training film TF9-3106 Public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied. The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and equalization (the resulting sound, though not perfect, is far less noisy than the original). Split with MKVmerge GUI (part of MKVToolNix), the same software can recombine the downloaded parts (in mp4 format): www.bunkus.org part 1: www.youtube.com part 2: www.youtube.com en.wikipedia.org A DC motor is an electric motor that runs on direct current (DC) electricity… Two important performance parameters of DC motors are the Motor constants, Kv and Km Brush The brushed DC electric motor generates torque directly from DC power supplied to the motor by using internal commutation, stationary magnets (permanent or electromagnets), and rotating electrical magnets. Like all electric motors or generators, torque is produced by the principle of Lorentz force, which states that any current-carrying conductor placed within an external magnetic field experiences a torque or force known as Lorentz force. Advantages of a brushed DC motor include low initial cost, high reliability, and simple control of motor speed. Disadvantages

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