Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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DC link current based commutation delay compensation method for sensored brushless DC motor drives

  • Arvind Goswami (Department of Electrical Engineering, Delhi Technological University) ;
  • Mini Sreejeth (Department of Electrical Engineering, Delhi Technological University) ;
  • Madhusudan Singh (Department of Electrical Engineering, Delhi Technological University)
  • Received : 2023.08.03
  • Accepted : 2024.02.02
  • Published : 2024.06.20
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Abstract

The commutation points of the Brushless DC motor in the sensored mode of operation are synchronized with discrete rotor position detection signals from three Hall effect sensors. Therefore, any delay in the hall sensor signals results in delayed commutation, which disturbs synchronization with the motor Back Electromotive Force (BEMF) profile. The classical methods to correct this commutation delay include phase advancing schemes that utilize BEMF profiling, zero crossing detection, virtual neutral point creation, and system architecture or control scheme modifications. This paper presents a method for estimating the commutation delay in electrical degrees using the proposed estimation relation with DC link current for fault effect minimization. The proposed method can be easily implemented in actual controllers without hardware change requirements. The proposed method is established and tested using MATLAB Simulink models for two motors with different delay angle values. The proposed method is tested on the experimental test bench of a controller with a 1 kW BLDC motor of an electric rickshaw under different load conditions. Simulation and hardware test results show the mean estimated commutation delay lying within ± 1° electrical of the actual value under various error and load conditions. The corrections implemented according to the estimated delay angles result in reduction of peak-to-peak DC link current, increase in the nominal torque generated per ampere, and reduction in the DC current ripple content. Simulation and experimental results confirm reduction in the effect of commutation delay and verify the effectiveness of the proposed method.

Keywords

References

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