Question

Will A Dc Motor Actually Produce Voltage If It Is Spun In Reverse?​

Answer 1

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Of course, the direction of current is controlled by the polarity of the voltage. So in order to change the direction of rotation, we can simply reverse the voltage, causing the current to flow in the opposite direction, changing the force by 180 degrees and the motor to be driven 'backwards.

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Answer 2

Answer:

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Explanation:

I just watched a video on Facebook by somebody who built a project to run an LED using a 9 volt DC motor scrounged from a battery operated toy. They simply wired the LED to the motor and then used a pulley system to spin the motor.

Here's a link to the video: Creating a generator from a DC motor.

Doesn't a typical DC motor like those used in toys act like an AC generator if you spin it? When you move a magnet past a coil of wire you get an AC pulse out of the coil. I would be surprised if a cheap DC toy motor contained a rectifier diode since it's designed to be a DC motor, not a DC generator.

So my expectation is that a typical DC motor would act like an AC generator.

Further, a 9 volt DC motor spun at a fairly high speed would probably emit around 9 volts AC with a fair amount of current behind it, so I would think you'd risk exceeding the reverse breakdown voltage on a small LED and burning it out.

I think the project in the video in question would need a rectifier diode (ideally a full-wave rectifier) and a current limiting resistor or it would risk blowing out the LED.

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