Hysteresis losses influence on the cogging torque of high-efficiency Surface Mounted PM Machines
Author
Mosincat, Ioan
Term
4. term
Education
Publication year
2011
Submitted on
2011-05-31
Pages
57
Abstract
Effektiv energianvendelse er et centralt mål i elektroteknik, fordi tab i motorers magnetiske kerner forringer ydeevnen. Kernetab har to hovedkilder: hvirvelstrømstab (forårsaget af cirkulerende strømme, der induceres i metallet) og hysteresetab (energi, der går tabt, når materialets magnetisering halter ved omvending). Denne afhandling udvikler en FEM-analyse (Finite Element Method) til at undersøge hysteresens effekter i ferromagnetiske materialer og validerer den med eksperimenter. Afhandlingen udleder også en optimeret model for hakmoment (cogging torque), en uønsket momentkrusning skabt af samspillet mellem permanente magneter og statortænder, for en overflademonteret permanentmagnetmaskine (SMPM). Med modellen og analysen undersøges, hvordan hysteresetab påvirker hakmomentet, og resultaterne viser en betydelig indflydelse.
Efficient energy use is a key goal in electrical engineering because losses in the magnetic cores of motors reduce performance. These core losses come from two main sources: eddy-current losses (caused by circulating currents induced in the metal) and hysteresis losses (energy lost when the material’s magnetization lags as it reverses). This thesis develops a Finite Element Method (FEM) analysis to study hysteresis effects in ferromagnetic materials and validates it with experiments. It also derives an optimized model of cogging torque (an unwanted torque ripple created by the alignment of permanent magnets with stator teeth) for a surface-mounted permanent magnet (SMPM) machine. Using the model and analysis, the thesis examines how hysteresis losses influence cogging torque and finds a significant effect.
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