Question 8-41E4

A resolver is an electromechanical device used to measure and transmit angular position. Its basic design facilitates the conversion of a mechanical angle into an electrical signal. The correct statement (C) accurately describes this fundamental structure: **The basic resolver contains a rotor winding and two stator windings that are 90 degrees apart.** * The **rotor winding** is typically energized with an AC reference voltage. * As the rotor turns, its magnetic field induces voltages in the two **stator windings**. * Because these stator windings are physically oriented 90 degrees apart, the voltage induced in one stator winding will be proportional to the sine of the rotor's angle, and the voltage in the other will be proportional to the cosine of that angle. These sine and cosine voltages represent the rotor's angular position. Let's look at why the other options are incorrect: * **A) Most resolvers contain a rotor winding and a delta stator winding.** Resolvers use two distinct stator windings for sine/cosine output, not a three-phase "delta" winding configuration in the fundamental sense. * **B) Resolvers consist of a two rotor windings and two stator windings that are 90 degrees apart.** A basic resolver typically has *one* primary rotor winding. Some specialized types or synchros might have more complex arrangements, but the fundamental resolver for angle measurement has one rotor winding. * **D) Resolvers consist of a "Y" connected rotor winding and a delta connected stator winding.** These "Y" or "delta" connections typically refer to three-phase winding configurations, which are not characteristic of the basic two-stator, one-rotor resolver.