IMPORTANT: HOW TO PULSE A MOTOR?

[ARMCORTEX]

https://www.youtube.com/watch?v=cev0Z9rKvag

For the sake of repertory of ideas, I would like to know all and every method seen or heard of by you on how mod a motor so that it gives off vibrations.

All methods, I want to rock unturned.

I believe some of you know my strong belief of the importance of this.

[deslomeslager]

Try removing a commutator, or a wire from a commutator.
Or try pulsing it irregular. Perhaps an AC motor will vibrate if you add a diode to the input line?
Or use a loose wire (will give of sparks, but as the motor will start jerking, it will vibrate like hell).
For mechanical vibrations: creating an unbalance can not be a problem.

[ARMCORTEX]

Thx you for your suggestion.

thgere was a researcher by the name of echols, or ekins, I read this a long tim ago, I believe he said that a ''cut winding'' would cause a pulse or break.

I remember this vaguely, does somebody know who I speak of?