A positive displacement pump includes a magnetostrictive actuator. A single actuator
drives multiple pumping chambers. The pump may include two pumping chambers driven
in phase by the linear expansion of the actuator at both its ends. The pump may
include a third pumping cavity, driven by the transverse expansion and contraction
of the actuator, out of phase with either cavity driven by the lengthwise extension
of the actuator. A pump assembly having multiple pumps each including a magnetostrictive
element is also disclosed.
