No abstract

No abstract

This paper presents results from an investigation into the optimal design of an open-slot, modular stator winding. The impact of the stator slot shape on the winding temperature rise is explored, taking account the distribution of loss that occurs in the open slot winding, including ac effects, and the heat transfer characteristics from the winding assembly into the stator core pack. The application focus is a single-layer, concentrated wound brushless PM machine, however the work is applicable to other machine formats. Alternative stator lamination profiles are compared; the commonly used parallel sided tooth with a trapezoidal slot, and a parallel sided slot with a trapezoidal tooth. The investigation includes the development of a reduced order thermal model representation of the stator. This model is employed to undertake coupled loss and thermal analyses to provide more accurate comparisons of the designs accounting for ac and temperature effects. The experimental and theoretical findings indicate the parallel sided slot design will result in a 37 o C lower winding temperature or an 11% increase in torque at the intended machine operation point.

No abstract

Prototyping is a key part of the design process, with artefacts increasingly fabricated using 3D printing methods. However, these printed parts often lack internal structure and the mass properties of the artefact – mass, balance and moments of inertia – differ from the design. It is hypothesised that a stakeholder's assessment of a design is affected by this misrepresentation. The work presented demonstrates that mass properties have a significant effect on stakeholder perception of prototypes. This is done through a study of University of Bristol students and consultation with industry.