> The mechanical action of the piezo is of an oscillator. A motor
> *could* be made to vibrate like a piezo by driving it CW and CCW on
> alternate cycles, but it wouldn't be doing much motory work

It is quite easy to do this with a coreless motor, also known as a bell sha=
ped armature, (e.g. Falhauber, Maxxon, and a few others) if run with a PWM =
of around 100Hz. At this sort of low frequency the armature can be shaken t=
o pieces, it needs to be around 20-30kHz PWM.

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