Development of a Thermofluid Model for Axial Field Permanent-Magnet Machines

Abstract

In this paper, a thermofluid model combining a lumped parameter heat transfer model and an air-flow model of a typical axial-field permanent-magnet (AFPM) machine is developed. The accuracy and consistency of the derived model are assessed by comparing the calculated flow rate and temperature values of a prototype machine with the measured ones. The developed thermofluid model is shown to perform thermal calculations with reasonable accuracy.

Radially resolved measurement of stator heat transfer in a rotor–stator disc system

“…Wang et al [10] attempted to develop a one-dimensional thermofluid model for AFPM machines using a similar empirical approach to Scowby et al The authors first derive a relationship between pressure drop and air mass flow rate at different rotational speeds, then construct a one-dimensional lumped parameter thermal network representing the air flow path through the machine -again, this implicitly assumes no fluid ingress at the periphery. The authors also apply rotor convective heat transfer coefficients from the literature to the stator because suitable stator heat transfer information is not available.…”

Experimental and CFD investigation of a lumped parameter thermal model of a single-sided, slotted axial flux generator

“…Nevertheless, accurately determining convection heat transfer coefficients is difficult due to the complexity of the flow regimes and it involves extensive theoretical and experimental explorations. In this LPM model, the convective heat transfers are evaluated by a number of existing correlations [22] based on the flow characteristic in the axial flux machine.…”

Measurement of stator heat transfer in air-cooled axial flux permanent magnet machines

“…Wang et al [6] also developed a one-dimensional lumped parameter thermal network model using a similar empirical approach. The validity of the one-dimensional model is unclear from the experimental temperature measurements presented.…”