How do you tell if a motor is brushed or brushless?

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Measure the resistance with a very low voltage (100 mV). Most DMMs will work. If the resistance is high (more than a few kilo-ohms) it is probably brushless. If it is low (less than 100 ohms) it probably has brushes. Count the wires 2 for a brushed motor and 3 for a brushless.

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Author: https://tch995319.tch.www.quora.com/How-do-I-tell-a-brushed-DC-motor-from-a-brushless-DC-motor-without-opening-the-motor