Magnetic Actuators and Sensors
Chapter One
Introduction
Magnetic actuators and sensors use magnetic fields to produce and sense motion.
Magnetic actuators allow an electrical signal to move small or large objects. To obtain
an electrical signal that senses the motion, magnetic sensors are often used.
Since computers have inputs and outputs that are electrical signals, magnetic actuators
and sensors are ideal for computer control of motion. Hence magnetic actuators
and sensors are increasing in popularity. Motion control that was in the past
accomplished by manual command is now increasingly carried out by computers
with magnetic sensors as their input interface and magnetic actuators as their output
interface.
Both magnetic actuators and magnetic sensors are energy conversion devices.
Both involve the energy stored in static, transient, or low-frequency magnetic
fields. Devices that use electric fields or high-frequency electromagnetic fields are
not considered to be magnetic devices and thus are not discussed in this book.
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