A Novel Mesh-Based Reluctance Network Model of Hybrid Excitation Magnetic Lead Screw for Wave Energy

Magnetic lead screw (MLS)., as a magnetic coupling and non-contact device, can convert low-speed linear motion into high-speed rotating motion, with high energy conversion efficiency, low friction, high operational reliability and low maintenance costs, and is suitable for wave energy converters (WEC). In this paper, a mesh-based reluctance network (MBRN) model is proposed to analyze the performance of a novel proposed hybrid excitation magnetic lead screw (HEMLS) for the WEC system. The proposed HEMLS not only can have enough maximum thrust through the PM is arranged on both sides of the rotor and mover, but also can be controllable through two-phase windings that carry opposite DC and placed in slots on the mover. The MBRN model divides the internal magnetic field of the MLS into several uniform mesh elements. The proposed model can be used to predict the performance of the HEMLS, including the air-gap flux density and thrust force. The proposed MBRN model is verified by finite element analysis (FEA) under both load and no-load conditions.