Abstract
This paper presents an optimal design of a recently introduced brushless wound-rotor synchronous machine (BL-WRSM). The BL-WRSM, with a special stator winding arrangement, utilizes a single three-phase inverter for generating an additional spatial subharmonic component in the stator magnetomotive force (MMF). This subharmonic component of the stator MMF is used for the brushless excitation of the rotor. The pole span and pole shoe height were the optimized parameters, with the goals of improving the quality of output power and reducing torque ripple. Moreover, the average torque of the machine was improved by optimizing the harmonic winding placed on the rotor. The optimized BL-WRSM was further analyzed for the flux weakening operation. Finite element analysis (FEA) was carried out to analyze the performance of the BL-WRSM. Finally, the performance of the optimal BL-WRSM model was verified through an experimental test, which demonstrated good agreement with the simulation results.
Highlights
Due to the increasing cost of rare-earth magnetic materials, as well as the need of high flux-weakening performance of motors in electrical and hybrid vehicles, brushless electrical excitation topologies for wound-rotor synchronous machines (WRSMs) have received increasing research attention to replace the brushes and slip rings assembly in conventional wound‐rotor synchronous machine (WRSM)
The brushless operation of the WRSM was achieved by generating an additional subharmonic The brushless operation of the WRSMcomponent) was achieved by generating an additional subharmonic component (along with the fundamental in the stator: magneto motive force (MMF)
This paper presents the optimal design of the BL‐WRSM
Summary
Due to the increasing cost of rare-earth magnetic materials, as well as the need of high flux-weakening performance of motors in electrical and hybrid vehicles, brushless electrical excitation topologies for wound-rotor synchronous machines (WRSMs) have received increasing research attention to replace the brushes and slip rings assembly in conventional WRSMs. A flux-weakening operation is performed to operate PM machines for high speed applications [10,11,12,13] Considering these issues with existing WRSMs and PM machines, purely electrically self-excited and brushless three phase synchronous machines have been studied [14,15,16,17]. In [17], a dual inverter brushless topology was presented for the subharmonic component of the stator used to excite the field the winding of the machine. The brushless operation of the WRSM was achieved by generating an additional subharmonic The brushless operation of the WRSMcomponent) was achieved by generating an additional subharmonic component (along with the fundamental in the stator: magneto motive force (MMF) This was achieved by supplying the three-phase sinusoidal currents through a single three-phase inverter to the specially designed stator winding.
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