Inductance Measurement of the Switched Reluctance Motor with the Current Traversal Response for Exciting Voltage Pulse

Abstract The stator inductance of the Switched Reluctance Motor (SRM) is the essential factor for the motor motion control, torque control and energy-efficient driving. However, the inductance possesses strongly nonlinear characteristics against the rotor position and phase current, which poses challenges for accurate measurement of the inductance under varying current and ever-changing rotor position. A inductance measurement method, namely the current traversal response for exciting voltage pulse, is proposed on the basis of an SRM model. The novel approach exerts a pulse voltage on a given stator winding, measures the dynamic process of a current response, and calculates the inductance under the varying current. The proposed method has the advantage of simple measuring facilities, full-range data-acquiring under semi-real driving scenario, and it is free of modeling errors. These merits helps to obtain an accurate full-range inductance under different rotor position and phase current, which renders a parameterized 3-D mesh for the SRM stator inductance. Further a novel cross-validation experimentation according to the magnetizing and demagnetizing status measurement verifies the feasibilities and accuracy of the proposed inductance measuring method.