This document is an application note from Analog Devices regarding the AD2S83, a silicon tachogenerator. It explains how the device provides continuous and precise speed control with long-term stability, serving as a brushless alternative to mechanical DC tachogenerators which require maintenance due to their commutators and brushes.
The text details the configuration of a typical type II tracking resolver-to-digital (R/D) converter using the AD2S83. It highlights that the AD2S83 can provide a high-quality velocity signal with a linearity error as low as +0.15% of its nominal value. The document also presents a performance test comparing the AD2S83 combined with a brushless resolver against a mechanical DC tachogenerator, demonstrating the superior performance of the resolver-based solution in terms of linearity, reversion error, and AC ripple content.
| Linearity error | +0.15% of its nominal value |
|---|---|
| Position accuracy | 8 arc min |
| Resolution | 10-, 12-, 14- and 16-bit user selectable |
| Maximum velocity tracking rate (12-bit mode) | 15,600 rpm |
| Excitation frequency | 5000 Hz |
The AD2S83 offers a brushless structure that permits reliable maintenance-free operation, unlike mechanical tachogenerators which require regular maintenance due to their commutators and brushes.
The AD2S83 provides a velocity signal with a linearity error as low as +0.15% of its nominal value.
The resolution of the position data is user selectable at 10-, 12-, 14-, and 16-bit.