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A common actuator in robotics; it's usually made of a static magnet (stator) and a set of moving inductors, acting as electromagnets, connected to the circuit through brushes. Brushless motors use phased clocks with electronic circuitry to generate motion.

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Probably when turning on the motor it draws enough current that the battery's internal resistance will drop voltage. In turn you see the voltage drop at the battery's terminals. When a DC motor starts …
answered Oct 2 '18 by stowoda