2-2
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Chapter 2
Using the Module
The primary winding, located at center, is excited with a sine-wave voltage. The resulting
magnetic field is coupled through the movable core into the secondary windings located on
either side of the primary. With the core at center, both secondaries have the same induced
voltage. With the series connection and polarity shown, the resulting output signal is zero. If the
core moves to the left, the left secondary is more strongly coupled to the primary than the right
secondary, resulting in a stronger induced voltage in the left secondary and an output signal that
is in phase with the primary excitation voltage. The more the core moves off center, the stronger
the imbalance and the greater the output signal. Moving the core to the right of center results in
the same behavior, but with the output signal out of phase with the excitation signal. Figure 2-2
shows these core locations and the resulting induced voltage and phase.
