Marine wave energy is characterized by high power density and worldwide distribution thus an important renewable source energy. A high power density tubular linear switch reluctance generator (TLSRG) is presented in this paper to be used as the direct drive wave energy generator. The mover of the machine includes series of ring segments which are insulated magnetically. The topology and detailed structure of the presented machine are demonstrated. The transient FEM model with the power converter circuit for generator mode is developed and the dynamic performance of the presented TLSRG are given, validating that the presented TLSRG has been an good candidate for wave energy generator.
This paper presents a novel linear switch reluctance machine (LSRM) with segmental stator. The principle of the presented machine is given and compared to the well-known teeth type linear switch reluctance machine. Because the presented machine incorporates a simple concentric winding and concrete ferrite-magnetic segmentations, it features unique magnetic circuit compared to teeth type linear reluctance machine. It is found that the presented linear reluctance machine gains favorable superiority over the teeth type linear reluctance machine in terms of high force density, high reliability and low cost. Different topologies of the presented machine are given and both their merits and demerits are discussed.
Linear switch reluctance machine (LSRM) has been an alternative to linear permanent magnet synchronous machine and linear induction machine. However, the nature of reluctance force production, together with the air gap which is always much larger than rotary SRM, result in low propulsion force density in LSRM. This is an inherent demerit of LSRM, limiting its applications where the machine size is strictly set. This paper presents a novel linear switch reluctance machine with segmental stator, which consists of series of ferrite-magnetic segments. The principle of the proposed LSRM featuring high force density has been introduced. A variety of topologies of the proposed machine have been presented including single stator, dual stator and non-stator yoke structure. This paper deals with the comparison of the proposed segmental stator linear switch reluctance machine and traditional teeth type linear reluctance machine in terms of the propulsion force, normal force and force ripple as well as the force density and active pay load ratio. Finite Element Method is implemented to obtain the correlated results. Some conclusions are drawn to verify the analysis above.
This paper presents a new modular design of a yokeless Linear Switch Reluctance Machine (LSRM), the stator of which is consisted of soft ferro-magnetic segments, and the mover includes separated cores wound by a simple annular winding. The mover cores have different width while the larger one are wound by the coils, leaving the smaller one unwound. A standard design procedure is developed. The results show that the presented linear reluctance machine gains a favorable superiority over the teeth type linear reluctance machine in terms of high force density, high reliability and low cost.
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