Multiphysics Modeling of a Permanent Magnet Synchronous Machine by Using Lumped Models

A multi-physics design methodology applied to a high-force-density short-duty linear actuator

“…1, is estimated using a relation applicable to concentric cylinders, (4), where the subscripts s and e refer to the stator inner bore and the effector respectively. The emissivity of the inner stator bore and effector surface are assumed to be equal resulting in an average radiation heat transfer coefficient of h rag = 3.1 W/m 2 .K, Table I.…”

“…The desire for electrical machines and devices to meet evermore demanding specifications in terms of power-density, energy-efficiency and short-duty operation, requires electromagnetic, thermal and other relevant physical phenomena to be accounted for simultaneously at the design stage, [1], through the use of coupled multi-physics design methodologies employing combinations of analytical, [2], [3], lumped parameter, [4], [5] and numerical, [3], [5]- [7], modelling techniques along with appropriate optimisation routines, [3], [8]. A major limiting factor on the energy conversion capability of such electrical machines and devices is the ability to dissipate internally generated heat and, in turn, the temperature rating of the electrical insulation system and permanent magnets (PMs), if present.…”

“…However, without proper selection of the modelling methods, model coupling, methodology structure and optimisation routine, the computation time of such an approach can often be prohibitive. This limitation is typically addressed by one or more of the following methods, [2]- [4], [6]- [9]:…”

“…The selection of modelling methods and design methodology structure are application specific and therefore difficult to generalise, as evidenced by the various approaches taken in the literature, [3], [4], [6]- [9]. However, a common approach links a relatively detailed electromagnetic Finite Element (FE) model with a coarse low computational cost Thermal Equivalent Circuit (TEC) model, [3], [4], [6], [8], [9].…”

“…However, a common approach links a relatively detailed electromagnetic Finite Element (FE) model with a coarse low computational cost Thermal Equivalent Circuit (TEC) model, [3], [4], [6], [8], [9].…”