Flux concentrated doubly salient linear permanent magnet machine
Flux concentrated doubly salient linear permanent magnet machine
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DOI：
10.1049/joe.2018.8133
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发表时间：
2019-01
影响因子：
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通讯作者：
A. Almoraya;N. Baker;K. J. Smith;M. Raihan
中科院分区：
文献类型：
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作者：
A. Almoraya;N. Baker;K. J. Smith;M. Raihan
游标永磁电机由于其高推力和功率密度，已被提出用于直接驱动低速应用的不同拓扑结构。然而，这种类型的机器可能会受到低功率因数(PF)的影响。提出了一种V形永磁阵列的磁链集中双凸极直线电机，并将其与后续极型电机进行了比较。使用V型永磁合金的结构允许磁通集中在位于两块永磁合金之间的铁隔离物中。结果表明，这一特性提高了气隙磁通密度，从而减少了电气负载，从而提高了功率因数。为了实现公平的比较，采用暂态有限元方法对两种不同永磁结构的双凸极直线永磁电机进行了分析和比较。被调查的机器具有相同的整体机器，而且至关重要的是，磁体体积。结果表明，该V型电机具有较大的推力、较高的空载反电势，在消耗相同的永磁材料的情况下，其功率因数可达42%。
Different topologies of Vernier permanent magnet (PM) machines have been proposed for direct drive low-speed applications due to their high thrust and power density. However, this type of machine can suffer from low power factor (PF). In this study, a flux concentrated doubly salient linear permanent magnet machine with V-shape PM arrays is proposed and compared to a consequent pole (CP) type machine. Using the configuration of V-shaped PMs allows the flux to be concentrated in iron spacers located between two pieces of PMs. This feature is shown to result in an improvement of the airgap flux density, which allows a reduction in electrical loading and hence an improvement in power factor. In order to achieve a fair comparison, two doubly salient linear permanent magnet machines with different PMs’ configurations have been analysed and compared using transient FEA. The investigated machines have the same overall machine and, crucially, magnet volume. The results confirm that the proposed V-shape machine is capable of higher thrust force, higher no-load back EMF and can achieve a higher PF of 42% compared to the consequent pole machine, while it consumes the same amount of the PM material.