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Compensation of Signal Offset, Amplitude Imbalance and Imperfect Quadrature in Rotor Position Sensor Signals for Motor Drives
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
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. The actual sensor signals have non ideal characteristics such as amplitude imbalance, imperfect quadrature, inductive harmonics, reference phase shift, excitation signal distortion, and disturbance signals. Due to the non-ideal characteristics of these signals, the position information of the Motor is considerably distorted. To solve this problem, the compensation algorithm is proposed. This research includes analysis of the above problems with an approach to minimize these errors. It can be realized with the Min/Max algorithm. The proposed algorithm helps in getting exact position of Motor. Experimental results verify the effectiveness of the proposed solution.