When you’re learning about electric motors, one of the main difficulties involves keeping track of all the terminology. The goal of this glossary is to provide simple definitions for many of the terms used throughout this book.
absolute encoder—An encoder that provides the controller with the motor’s speed and position.
AC motor—A motor that runs on AC (alternating current) power. May be synchronous or asynchronous, single-phase or polyphase.
air gap—Space separating the rotor and stator in an electric motor.
aircore motor—Motor whose electromagnets lack iron cores.
Arduino—Family of microcontroller-based circuit boards that are wildly popular among makers because of their simplicity, low cost, and free design.