Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Resolver (electrical)
open-in-new
<p>A resolver is a type of rotary electrical <a href="/facts/Transformer/EYYfXWrF">transformer</a> used for measuring degrees of rotation. It is considered an <a href="/facts/Analog_device/KPAmXS1r">analog device</a>, and has digital counterparts such as the digital resolver, <a href="/facts/Rotary_encoder/HonPQvzJ">rotary (or pulse) encoder</a>. A rotating coil induces voltage in two stationary coils, and by comparing the phase of the signal in the two secondaries, the angle can be accurately determined. These systems were commonly used in mechanical control systems, for instance, counting the number of revolutions of a <a href="/facts/Screw_jack/B9kjdeBt">screw jack</a> to move an aircraft's <a href="/facts/Flap_(aeronautics)/NJEgNK66">flaps</a> to a specific extension. </p>