An efficiency map is an effective method for expressings the performance of a motor in all operating regions. Conditions which maximize efficiency are required to obtain an efficiency map, and a JMAG-RT model has been traditionally used to write an efficiency map.
JMAG now offers a tool which uses finite element analysis (FEA) calculations to output an efficiency map. The advantage of using FEA to calculate an efficiency map is accuracy. In addition to the method using a plant model, an efficiency map can be created by incorporating dynamic effects, such as eddy currents in magnets and coil wires.