8. Linear Motors

Until this chapter, every electric motor discussed in this book has produced rotary motion. Voltage and current go in, torque and rotational speed come out. This chapter leaves those motors behind and takes a look at linear motors. These motors move in a straight line with linear force and speed.

Linear motion is needed in many types of systems, but linear motors aren’t commonly used by makers or professional engineers. That’s because these motors aren’t well-understood, there aren’t many manufacturers, and they’re expensive. For these reasons, designers frequently obtain linear motion by connecting rotary motors to mechanical elements. As an example, the popular 3D printer RepRap obtains linear motion by connecting stepper motors ...

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