Axial Magnetic Flux in Synchronous Machines: The Effect of Operating Conditions

The axial component of leakage magnetic field in synchronous machines has detrimental effects, which are outlined and is shown to be related to operating conditions. The load dependence is characterised in terms of the system parameters and constants obtaited from steady-state tests. Experimental results are presented for a number of measurement positions within the stator core under steady-state, pole-slipping and sudden short circuit conditions.