Application of magnetic sensor in actuator motor of vehicle active front steering system

In order to apply magnetic sensor in brushless DC motors actuator of vehicle active front wheel steering (AFS) system with variable gear ratio (VGR) mechanism, signal processing algorithm for brushless DC motor (BLDCM) control system was proposed based on the analysis of system requirements for position sensor and working principle of HMC1512 sensor. Three-closed-loop control model of BLDCM and signal processing model were established in Matlab/Simulink. Based on the rotation angle from the simulation of control model, rotor position, rotation angle and rotation speed were calculated according to the signal processing model, and compared with the corresponding signals according to three-closed-loop control model. The results show that the calculation signals are basically consistent with the corresponding signals.It is proved that the algorithm can be used to identify the rotor position and calculate the rotation angle and rotation speed, which provides basis for the application of HMC1512 in the actuator motor of AFS.