Integrated Field and Armature Current Control Strategy for Variable Flux Reluctance Machine Using Open Winding


This paper proposes an integrated field and armature current management strategy for a variable flux reluctance machine (VFRM) with an open-winding topology. By using an open-winding inverter, the sector and armature currents will be injected into one coil as a sinusoidal current biased by the dc offset rather than the separated field and armature windings. The integrated current control can cut back the copper loss to [*fr1] and extend the operating speed vary due to the reduction within the winding resistance. So as to utilize the zero-sequence current as a field current, a zero-vector modification technique is proposed, in which the switching-on time of the zero vectors is changed to get the constant zero-sequence voltage between 2 inverters. The proposed scheme is implemented during a synchronous dq0-axis frame with space vector modulation. For the validation of the proposed methodology, a machine model of the VFRM is developed and implemented in MATLAB/Simulink. The simulation and experimental results verify that the proposed strategy can effectively cut back the copper loss and extend the operating speed range.

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