Abstract
In an open-winding machine, three-phase stator currents can be controlled such that the input armature currents may contain the third-harmonic current component in addition to the fundamental. Considering this attribute of open-winding patterns, a harmonic current field excitation technique for a wound rotor synchronous machine (WRSM) is proposed in this paper based on the control of time-harmonic magneto-motive force. Two inverters connected to both terminals of the stator winding are controlled so that the input armature current generates an additional third-harmonic current component. This third-harmonic component generates a vibrating magnetic field that induces a current in the specially designed rotor harmonic winding. The current is supplied as DC current to the rotor excitation winding to generate a rotor field by using a full-bridge diode rectifier in order to achieve brushless operation. The proposed dual-inverter-controlled brushless operation for a WRSM is executed in ANSYS Maxwell using 2-D finite element analysis to validate its operation and electromagnetic performance.
Highlights
In recent years, rare earth permanent magnets have become very expensive
Permanent magnet (PM) machines have several advantages such as high efficiency, high power and torque densities, and high-power factors compared with conventional induction and switched reluctance machines, they may not be favorable for several industrial applications
This paper proposes a brushless wound rotor synchronous machine (WRSM) based on an open-winding pattern
Summary
Rare earth permanent magnets have become very expensive. permanent magnet (PM) machines have several advantages such as high efficiency, high power and torque densities, and high-power factors compared with conventional induction and switched reluctance machines, they may not be favorable for several industrial applications. The time-pulsating third-harmonic MMF is used to induce back-EMFs in the harmonic winding of the rotor, which is rectified for rotor field excitation This arrangement is compelling and opened new avenues for investigating brushless techniques for WRSMs. the operation of two inverters at different frequencies may increase losses and affect the performance of the machine. The proposed topology generates current waveforms which inherently contain a third-harmonic current component by means of two conventional inverters operating at the same output magnitude of currents and frequencies This means that unlike the existing techniques, the proposed topology does not require the injection of two different magnitudes of current, any additional switches installed between the inverter and the armature winding, sophisticated inverter topology and drive systems, and modifications in machine structure.
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