Oscilloscope square waves with interference?

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Jian17
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https://gyazo.com/cba46dfedd9bed7fa49e79a93a25911c

So in my lab experiment, it involved an electronic amplifier circuit connected to a motor for motor control. The motor rotated - stopped - and rotated in the opposite direction and repeat.

My question is, what's the cause of these "distorted" (don't know if this is the correct term) for these square waves?

Is it interference?

Thank you very much
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Joinedup
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on a DC motor the 'grass' could be commutator noise - you could think about attenuating it with a capacitor across the terminals placed close to the motor.
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