Operational Force Shape (OFS) analysis provides a direct visualization of system-level dynamic magnetic forces at a given frequency or for a given Load Case. Frequencies can be selected in terms of mechanical orders (multiple of H1, rotor mechanical frequency) or electrical orders (multiple of fundamental electrical frequency). It is the analogue for exciting forces of the excited structure Operational Deflection Shape (ODS).
OFS can be visualized in 3D, or in 2D in the plane of a slice (especially useful for skewed electrical machine).
This features allows electrical engineers to visualize the shape of magnetic excitations, and mechanical engineers to analyze the root cause of a resonance during the virtual prototyping of electrical machines. Tangential and radial forces may act in phase or in anti-phase, resulting in constructive or destructive interference at vibration level.