A resolver to digital converter is an electrical type device that acts as a converter of resolver sensors signal and outputs them as a digital value that corresponds to the rotating shaft angle and velocity.

How does a resolver to digital converter work?

This particular type of converter operates by using sine and cosine signals to decode the angular position and rotation speed of the motor shaft through the interface between a resolver and a microprocessor.

These converters perform calculations of velocity through the utilisation of a Type-II tracking loop that makes use of a second-order filter that is designed to ensure that steady-state errors are zero for constant velocity signals. The converter will then sample both inputs to output digital data to the tracking loop.

Some of these types of converters also feature A fault detection sensor which circuit can sense a loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking.

Where are resolver to digital converters used?

These converters are widely used in noisy environments that induce high-frequency noise into sine and cosine lines such as the automotive industry and industrial sectors.

Resolver to digital converters are used in applications such as;

Encoder emulation

Integrated starter generators/alternators

Automotive motion sensing and control

DC and ac servo motor control