Essentials of Mechatronics

Chapter 2 - The Bare Essentials

2.1   ACTUATORS

A mechatronic system must “do” something, even if it is just to move a pointer
or change a display. The industrial robot must have motors with which to
move an end effector, perhaps a gripper, while another system’s output might
concern heaters.

The mechatronic engineer should not be in too much of a hurry to run to
the catalog to choose an electric motor. To the electrical engineer, motors are
a fascinating playground around which to debate the merits and challenges
of axial flux, windage losses, rotor resistance, or commutation. The mechatronic
engineer is by no means certain that the solution does not instead lie
with something hydraulic or pneumatic.

This section attempts to put a selection of the vast range of actuators into
some sort of perspective.


2.1.1   Choosing a Technology

The first question to ask is: “What must the output do?”

At the bottom end of the list, in terms of power, is the task of displaying
a value on an indicator. Many automobile instrument panels have now been
taken over by liquid crystal displays, probably putting them outside the grasp
of mechatronics, but they are just the tip of the iceberg.

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