Passive Position Sensing 1 Introduction

Active Angular Position Sensing

2.1 Introduction

Because of the limitations of potentiometers in angular position measurements, we now consider a different type of angular position sensor, the resolver. The resolver has no limitations on angular position and the sensing method is based on magnetic coupling which requires no mechanical contact such as in the case of a pot. The resolver consists of two pairs of stator coils (usually identical) positioned at 90o degrees from each other. A third winding is on the freely rotating rotor connected to the outside world via a pair of slip rings. See figure 2 below.