Abstract
This paper presents a new high-efficient three-phase brushless wound rotor synchronous machine (BL-WRSM) based on a sub-harmonic field excitation technique. In the proposed machine topology, the stator is equipped with two different three-phase windings: (1) main armature winding, and (2) additional armature winding. The main armature winding is based on a 4-pole winding configuration, whereas the additional armature winding is based on a 2-pole winding configuration. Both windings are supplied current from two different inverters, i.e., inverter-1, inverter-2, and simultaneously. Inverter-1 provides the regular input current to the main armature winding, whereas inverter-2 provides a three-phase current of low magnitude to the 2-pole additional armature winding. This generates an additional sub-harmonic component of MMF in the airgap beside the fundamental MMF. On the other side, the rotor is equipped with (1) harmonic, and (2) field windings. These windings are electrically coupled via a rectifier. The fundamental component of MMF produces the main rotating magnetic field, whereas the sub-harmonic MMF gets induced in the harmonic winding to produce harmonic current. This current is rectified to give DC to the rotor field winding to attain brushless operation. To authenticate the operation and analyze its performance, the proposed BL-WRSM topology is supported using 2-D finite element analysis (FEA) in JMAG-Designer. Later on, the performance of the proposed brushless topology is compared with the customary BL-WRSM topology to verify its high efficiency, high output torque, low torque ripple, and low unbalanced radial force on the rotor.
Highlights
Regardless of offering several advantages such as high torque density, power density, efficiency, and power factor, permanent magnet (PM) machines are getting less consideration these days [1,2,3,4,5,6,7] due to the increasing cost of rare-earth metals required to build PM machines
This paper proposes a new high-efficient brushless wound rotor synchronous machine (BL-WRSM) topology based on a sub-harmonic field excitation technique that involves two distinct windings: (1) main armature winding, and (2) additional armature winding installed in the stator slots
A high-efficient BL-WRSM topology based on a sub-harmonic field-excitation technique was proposed in this paper
Summary
Regardless of offering several advantages such as high torque density, power density, efficiency, and power factor, permanent magnet (PM) machines are getting less consideration these days [1,2,3,4,5,6,7] due to the increasing cost of rare-earth metals required to build PM machines. The inverter provides the regular three-phase current to the stator winding in this topology, whereas a rectifier is employed whose output is connected to the neutral of the Y-connected armature winding This generated an additional 3rd-harmonic MMF component in the airgap, which is used to produce harmonic current in the harmonic winding to energize the rotor field winding for the brushless operation. The induced harmonic current was rectified to energize the rotor field winding for the brushless operation of WRSMs. As the proposed topology employs two halves of the armature winding installed at the opposite sections of the stator, the rotor of the machine experiences an unbalanced radial force. This paper proposes a new high-efficient BL-WRSM topology based on a sub-harmonic field excitation technique that involves two distinct windings: (1) main armature winding, and (2) additional armature winding installed in the stator slots. The structure and operation of the customary and proposed BL-WRSM topologies based on sub-harmonic field excitation techniques are discussed in subsequent sections
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