Abstract
Transverse flux permanent magnet linear generator (TF-PMLG) is widely used in direct drive wave energy converter (DD-WEC) because of its high power density. Traditional transverse flux machine (TFM) is designed and built in form of translator-PM. But translator-PM configuration needs a large amount of PM and the cost is high in long stroke application, like DD-WEC. Recently, the stator-PM linear machines have gained more attention for reducing the PM volume and improving the generator performances under low-speed conditions. In this paper, a novel stator-PM TF-PMLG for DD-WEC has been proposed. The fundamental configuration and operation principle of the generator are illustrated. Then, the expressions of the back EMF and the electromagnetic thrust are derived by magnetic circuit analysis. Main dimension parameters, such as PM thickness, central angle of the outer stator shoe and pole pitch are determined and optimized based on finite element analysis (FEA). This topology has advantages of low PM consumption and high power density, and is a suitable candidate for long stroke applications, like DD-WEC, in which a high power per PM volume is usually needed to reduce the amount of permanent magnet and ensure high power density.
Highlights
Wave energy is converted into electricity by using various power take-off (PTO) technologies, of which direct drive wave energy converter (DD-WEC) has simpler configuration, higher efficiency and better development prospect [1]–[6]
From the perspective of the magnetic circuit, a stator-permanent magnets (PMs) transverse flux permanent magnet linear generator (TF-PMLG) topology is proposed, the armature winding and PMs are located in outer stator and inner stator respectively and the translator is made of steel blocks and non-magnetic blocks
The topology of TF-PMLG is symmetric in radial direction, the arrangement of the steel blocks and nonmagnetic blocks of the moving translator is different in moving direction (z-axis), which leads to the asymmetry of flux linkage and back electromotive force (EMF)
Summary
Wave energy is converted into electricity by using various power take-off (PTO) technologies, of which direct drive wave energy converter (DD-WEC) has simpler configuration, higher efficiency and better development prospect [1]–[6]. In order to reduce the PM volume and improve the generator performances under low-speed conditions, a tubular partitioned stator flux-reversal stator-PM linear machine for DD-WEC is proposed, the translator is a moving aluminum tube [16]. From the perspective of the magnetic circuit, a stator-PM TF-PMLG topology is proposed, the armature winding and PMs are located in outer stator and inner stator respectively and the translator is made of steel blocks and non-magnetic blocks. (2) The armature windings and PMs are located in outer stator and inner stator respectively and the translator is made of steel blocks and non-magnetic blocks. When the moving speed of translator v = 1m/s and the load current I = 7A, the thrust reaches the maximum value when central angle of the outer stator shoe is 26◦. Τ is chosen to be 24mm and the number of stator lamination piece is 3
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