Compensation of Signal Offset, Amplitude Imbalance and Imperfect Quadrature in Rotor Position Sensor Signals for Motor Drives
In recent years, the use of the electric motors in automotive applications such as electric power steering (EPS), hybrid and electric vehicles has increased. In these fields, rotor position information plays and important role in the field- oriented control concept. It performs a transformation from the stator reference frame to the rotor reference frame and vice versa. This is nothing but the Park and inverse Park transformation. They are typically used to provide accurate absolute rotor position in high-performance motor drive systems because their robustness and reliability make them particularly suited to Automotive Environment. Hence, greater accuracy of these sensor signals is required. However, in reality, the output signals include the position error in the sensor itself as well as error in the sensor signal conditioning circuits.