Introduction to the Design of Electric Machinery

This chapter focuses on the analysis of electric machinery and drive systems, and use of these concepts for design. In particular, the design of a permanent‐magnet ac machine is considered. The chapter aims to predict machine performance based on a geometrical machine description. It discusses the geometry and winding configuration and outlines the material properties, and delineates the current control philosophy of the machine. The chapter focuses on finding an expression for the radial flux density of the machine. This is followed by an explanation of a derivation of expressions for the electrical parameters of the machine. The chapter addresses the implications of the air‐gap field on the field within the steel and permanent magnet. Further, it considers the formulation of the design problem. Finally, the chapter provides a case study on multiobjective optimization‐based machine design.