Ripple of rectified EMF in alternators

The article discusses ways to reduce the ripple of rectified voltage in alternators based on synchronous electrical machines. To that end, the paper compares alternators that differ in the number of phases as well as in the circuitry of the semiconductor rectifier. The authors consider odd- and even-phased alternators with armature windings made of three-phase groups. Half-wave and full-wave rectifying circuits are considered. The ripple coefficient was used as the comparison criterion. Analysis reveals the performance with a relatively small number of phases can be maximized using an aggregated generator, the armature winding of which is divided into two parts offset by 30 electrical degrees against each other and connected to separate bridge rectifiers connected in series or parallel to the load.