Permanent magnet DC motors have permanent magnets to provide a fixed magnetic field. Therefore, they only have one input variable, which is to supply voltage.

If I increase the input voltage, the speed of the motor will also increase. And if I decrease the voltage, the motor will slow down.

To control the direction of the motors, we simply just reverse the polarity of the input terminal. Now you can see the motor is spinning in a different direction. Let me connect back. Now the motor is spinning in the opposite direction.

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