Propagation delay (also called output latency) is a feature of the position sensing circuit in a spinning motor. It is the time interval between the moment when the angle is measured by a position sensor, and the moment when the measurement signal is transmitted to the host microcontroller.
The propagation delay is problematic because it causes dynamic angle error at high rotational speed. This dynamic angle error increases with speed at a linear rate. Therefore the higher the propagation delay and the speed, the greater the dynamic angle error.
Electronically controlled motors, and brushless DC (BLDC) motors in particular, require extremely accurate data on the rotor's angle of rotation while turning at high speed.
The integrated dynamic angle error compensation (DAEC™) technology from ams implements a compensation algorithm which almost completely eliminates the effect of the propagation delay inside the position sensor, yielding almost zero output latency. This technology enables the effective control of torque in BLDC motors and provides for highly efficient motor operation by eliminating vibration and other interfering mechanical effects.