A New Brushless Generator with Nonsalient Poles

Electric generators are used not only for electric power industrial production, connected to large electrical networks, but also in isolated grids such as the ones in ships, aircrafts, etc. For operating generators, not only their efficiency and dimensions are important, but also reliability. The concept of generator reliability also includes the time-to-maintenance period, and in some hard-to-reach equipment this parameter is of utmost importance - for example, for wind turbine generators, for which maintenance tasks are difficult due to the height of the mast. The need for periodic maintenance to replace brushes and slip rings is a disadvantage of all classical synchronous generators, as it is associated with taking them out of service, and additional personnel costs. Generators with permanent magnets do not have brushes, but they do not allow adjusting the output voltage over a wide range when the rotation speed or load power changes - thereby eliminating their operation on the electrical network without a converter. This article describes the design of a new monopolar generator without brushes, which has nonsalient excitation poles on the stator. Simple and reliable, the generator can be used everywhere as a source of AC voltage.