Electromagnetic Design of Synchronous Machines

This chapter considers the design of salient pole synchronous machines. Synchronous machines are nearly always designed so that the magnetic circuit, particularly the rotor poles, is rather highly saturated. Hence, in order to obtain useful values for machine parameters, a simple superposition scheme based on computing the fluxes produced first by the field and then by the stator MMF independently and adding the result is usually inapplicable. A solution must be obtained with the machine at a representative operating condition, usually as close to rated load and power factor as can be estimated. The analysis of a synchronous machine begins by calculating the magnetizing inductance associated with the direct axis component of stator current. The direct axis magnetizing inductance is equal to the flux linkages produced by the stator currents divided by the
d
‐axis component of stator current.