Electromagnetic Analysis and Experimental Study to Optimize Force Characteristics of Permanent Magnet Synchronous Generator for Wave Energy Converter Using Subdomain Method

Abstract

This paper presents an electromagnetic analysis and experimental verification to optimize the noise, vibration, and harshness (NVH) characteristics of a permanent magnet synchronous generator (PMSG) for wave energy converters (WECs). WECs applicable to breakwater installed in island areas require a wider operating range and a robust design for maintenance compared with wind-turbine systems. Owing to the use of a permanent magnet with a high energy density, the PMSG has a higher power density than other types of generators; however, strong electromagnetic excitation forces that affect the NVH characteristics are generated. Therefore, in this study, the electromagnetic forces are analyzed through an electromagnetic-field analysis using a subdomain analytical method. Based on the analytical solution, electromagnetic forces were determined. Four electromagnetic excitation forces were classified, and the methods for reducing electromagnetic excitation forces are presented here. Finally, a method for evaluating the system resonance through electromechanical analysis is presented. The proposed analysis, optimization, and experimental study are validated through comparison with finite-element analysis and experimental results.

Comprehensive Analysis and Evaluation of the Operation and Maintenance of Offshore Wind Power Systems: A Survey

“…The effects of different types, sizes, temperatures, and faults on the performance and reliability of generators [54,55] have also been discussed. Additionally, the advantages and design suggestions of new generator technologies, such as silicon carbide MOSFETs [56], high-temperature superconductivity excited double-stator direct-drive wind turbine [57], permanent magnet synchronous generator [58][59][60][61] (Ref. [62] proposed E-type modularization), hydraulic transmission [63], etc.…”

“…[62] proposed E-type modularization), hydraulic transmission [63], etc. (for example, analysis of mechanical characteristics [59]), and their corresponding analysis and evaluation have been carried out.…”

An Improved Model for Five-Phase Induction Motor Based on Magnetic Noise Reduction Part II: Pole-Slot Scheme

“…The MMF of the stator is obtained when the sequential five-phase currents pass through the windings. Substituting (3), ( 4) and ( 5) into Maxwell's radial force expression (7), the radial electromagnetic forces generated by all radial magnetic flux harmonics can be determined.…”

“…Aerodynamic and mechanical problems, which mainly result from turbines and assembly errors, can be ignored in the design stage. However, electromagnetic vibration levels can directly affect the NVH characteristics and cause failures, such as bearing failure and insulation breakdown [7]. Magnetic pull force [8], torque ripple [9], cogging torque [9], and unbalanced magnetic force [8] are the main electromagnetic sources of NVH characteristics.…”

A Multi-Objective Finite-Element Method Optimization That Reduces Computation Resources Through Subdomain Model Assistance, for Surface-Mounted Permanent-Magnet Machines Used in Motion Systems

“…There have been attempts to include magnetic saturation directly in the subdomain models, but the computational burden is high [38]. Much work has also been published using linear subdomain models to model and optimize structures [39], [40]. Nevertheless, as those models are linear, they lead to incorrect structures.…”