Parallel hybrid excitation alternators (PHEAs) are large in size but offers wide flux regulation capability. Series hybrid excitation alternator has limited flux regulation capability but compact compared to PHEAs. A new rotor excitation topology has been proposed for a series hybrid rotor excitation alternator (SHREA). The proposed machine is not only small in size but also have wide flux regulation capability. The proposed machine can be classified as a series hybrid machine as permanent magnets and field windings are arranged in a single rotor ensuring series addition of permanent magnet flux and field winding flux. In this study, one more rotor configuration for quick maintenance SHREA is also proposed. As the name suggests, for any fault in excitation winding, they can be easily replaced. Two 1.3 kW prototypes with such designs have been validated with finiteelement method simulation and hardware testing. (a) Voltage and current waveforms. (Ch1) Line-to-line voltage (100 V/div). (Ch2) Line current (10 A/div). Time = 5 ms/div, (b) Comparison of terminal characteristics
The power electronic equipment is very much required when the alternator, capable of providing certain voltage level with a certain frequency, has to supply power to the load that needs voltage level or frequency other than the rated voltage and rated frequency of the alternator. At the same time, the power electronic circuit will also become complex if the alternator is to be provided with multiple outputs of different voltages with different frequencies. Therefore, a hybrid flux permanent magnet alternator (PMA) with multiple outputs is proposed in this study by utilising both radial flux permanent magnet (PM) technology and axial flux PM technology. The utilisation of both radial and axial flux PM technologies in the proposed hybrid flux multiple output PMA increases the power density also compared with that of conventional multiple output PMA. A comparison study is carried out between the conventional PMA and proposed hybrid flux multiple output PMA for the same volume and the same is also validated with finite-element method software and prototype testing.
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