Abstract
The analysis and performance evaluation of a harmonic reduction strategy of a non-overlap winding wound rotor synchronous machine is conducted in this paper. The harmonic reduction strategy utilizes phase-shifts between coil currents to reduce sub- and higher-order harmonics. The design is performed on a 3 MW wound rotor synchronous machine with a 16/18 pole/slot combination. The application results in a lowered torque ripple and an increased efficiency of the designed machine. The manufacturing and testing of a 3 kW prototype to ascertain the effectiveness of the design is also presented. The practical measurements correlate successfully with the theoretical results.
Highlights
The drive to reduce costs and improve efficiency of electric machines in power generation applications, amongst others, is an ongoing study
Wind generation registered a growth of 10% from 2018 to 2019, according to the Renewables Global Status Report for 2019 [1]
Permanent magnet synchronous machines (PMSMs) have been the preferred solution for wind generation systems, partly because of the reduced size of the generator, but methods to improve other synchronous machines are in demand to avoid the use of rare-earth materials and reduce the cost of generation
Summary
The drive to reduce costs and improve efficiency of electric machines in power generation applications, amongst others, is an ongoing study. A non-overlap winding structure is used for the WRSM to improve torque density of the machine and to lower manufacturing costs associated with winding complexity [2] It is well-known, that non-overlap windings contain sub- and higher-order harmonics in the magneto-motive force (MMF) distribution [2]. The method does not reduce higher-order harmonics and is limited to certain pole/slot combinations Stator shifting is another technique that has been investigated to reduce sub- and higher-order harmonics and was applied to a 14/12 pole/slot machine where the number of stator slots is doubled [8]. This study applies the wye-delta coil-current phase-displacement technique to a large 3 MW 16/18 (or else 8/9) pole/slot combination WRSM presented for a mediumspeed geared solution with a setup as proposed in [12]. A 3 kW prototype with the proposed phase-shifted winding is manufactured and experimentally analysed for the first time to assist with the validation process
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