two square blue LED lights

The piezo drive scenario is the complement of the electromagnetic drive, where current drive is needed and voltage is a consequence; here, voltage is what is needed, and current is the consequence. The piezo driver must supply the needed voltage (not current) into a capacitive (not inductive) load, and it must control and modulate this voltage to force the desired crystal elongation. In other words, current is the independent parameter and voltage is reliant on parameter for conventional motors, but for piezo motors, the situation is the opposite.

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