Method of compensation of systematic position errors in digital drive system with incremental indicators with rotation rate regulators

摘要

The method involves impressing a constant target rotation rate onto the rotation rate regulator. Rotation rate relevant rotation rate undulation values are determined in dependence on the position for at least 80 per cent of the position values in a sinusoidal period of the indicator system. The corresponding position error values are determined by integration of the undulation values in dependence on the position. Position error correction values are formed by inverting the determined error values. The corresponding correction values are added to the current position value in the cyclical rotation rate regulation loop during operation of the indicator system.