This study presents an algorithm for estimating two-phase rotor reference frame currents using a single-current sensor. For proper vector control operation, at least two of three-phase current information is required. The single-current sensor algorithm is presented for vector-controlled interior permanent magnet synchronous motor drive to reduce the cost and increase reliability. dq-axes current formation method evaluates the two-phase currents in the stationary reference frame by sensing only one-phase current and speed/position information. The two-phase stationary reference frame currents, iβs current, are estimated using iqs * and iαs, i.e., constructed from single sensor information. D- and q-axes currents are obtained from iαs and ibs * . These are used to close the current loop in the vector-controlled drive. Threephase currents can be reconstructed from the estimated two-phase currents. This method is entirely independent of machine parameters and applicable to all kinds of permanent magnet synchronous motor machines. The presented algorithm is validated on MATLAB/SIMULINK platform. Some sample results are shown from an experiment performed on a prototype developed in the laboratory (using dSPACE 1104).
Cite this article as: S. Shiva Badini and V. Verma, “Vector-controlled permanent magnet synchronous motor drive with reduced current sensor,” Electrica, 23(1), 87-94, 2023.