Design optimization of permanent magnet actuators.

This study describes the design optimization of permanent actuators, of both rotary and
linear topologies. Parameter scanning, constrained single and multi-criterion
optimization techniques are developed, with due emphasis on the efficient determination
of optimal designs.
The modelling of devices by non-linear lumped reluctance networks is considered, with
particular regard to the level of discretization required to produce accurate global
quantities. The accuracy of the lumped reluctance technique is assessed by comparison
with non-linear finite element analysis. Alternative methods of force/torque calculation
are investigated, e.g. Lorentz equation, Virtual Work, and Maxwell Stress Integration
techniques, in order to determine an appropriate technique for incorporation in
a non-linear iterative optimization strategy.
The application of constrained optimization in a design environment is demonstrated by
design studies and experimental validation on selected prototype devices of both
topologies.