Motor Control Device for Accurate Angle Detection

The patent extracts the problematic transformation mechanism (speed reducer with gears) from the detection system and replaces it with a direct detection approach. The absolute angle sensor is mounted directly on the rotation shaft to detect its absolute rotation angle without any intermediate transformation, thereby eliminating the source of detection errors caused by dimension and erection tolerances.

The patent introduces a computation circuit as an intermediary that processes data from both the relative angle sensor and absolute angle sensor. This computation circuit calculates the absolute rotation angle by combining information from both sensors, using the relative rotation angle to determine the current rotation cycle and the absolute rotation angle to establish the reference position, thereby achieving accurate detection without relying on mechanical transformation mechanisms.

The patent performs preliminary action by detecting and storing the absolute rotation angle at the reference position (neutral position) when the system is powered on. This initial detection establishes the baseline for subsequent relative angle measurements. The system then uses only the relative angle sensor during normal operation, avoiding the need for continuous absolute angle detection and thereby reducing power consumption while maintaining accuracy.

The patent implements periodic action by using the absolute angle sensor only at specific moments (when power is activated or when recalibration is needed) to update the reference position, rather than continuously. During normal operation, the system relies on the relative angle sensor which consumes less power, thus achieving a balance between maintaining detection accuracy and reducing energy consumption.