What is another name given to a resolver due to its design?

The correct answer is "Rotary electrical transformer" because a resolver functions similarly to a transformer in the sense that it converts electrical energy into a rotational position signal and vice versa. It operates based on the principle of electromagnetic induction. In a resolver, there are typically two windings: a stator and a rotor, which helps in providing both the sine and cosine components of the angle, effectively translating the mechanical movement into an electrical signal that indicates position.

This design characteristic establishes the resolver as a rotary electrical transformer, providing significant advantages in terms of accuracy and reliability in applications requiring precise position sensing, such as in robotics and aerospace systems. The term "rotary" is particularly fitting since resolvers are specifically used for applications that involve rotational movements.