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Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines by Matthew Scarpino

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1. Introduction to Electric Motors

Of the many elements that can be placed in a circuit, none are as versatile or as exciting as the electric motor. Electric motors make it possible for robotic hands to grasp, electric cars to roll, and drones to fly. Quadcopters and 3D printers receive a great deal of attention, but to a system designer, they’re just specialized motor control circuits.

In addition to being exciting, motors can also be hard to understand. When selecting a resistor, a designer only needs to be concerned with simple properties such as tolerance, temperature, and power rating. But when selecting a motor, there’s a long list of questions that need to be addressed:

Should the motor be direct current (DC) or alternating current (AC)? ...

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