On the Means of Stabilizing the Output Voltage of Brushless Direct Current Generators with Excitation from Permanent Magnets

Abstract

Further development of the voltage booster principle is proposed in relation to solving the problem of stabilizing the output voltage of a brushless direct current permanent magnet generator. In addition to the well-known voltage boost mode, a voltage decrease mode is proposed. It is shown that the use of both modes in the corresponding areas of change in the permanent magnet generator shaft rotation frequency (which characterizes the use of a reversible voltage booster channel) has an advantage in terms of the installed power of electronic transformer devices for voltage stabilization. A new topological feature of the proposed brushless direct current permanent magnet generator structures is the bifurcation of the cathode group of the main three-phase rectifier bridge, which made it possible to exclude diodes in a single-phase booster high-frequency rectifier, and assign their function to the diodes of two cathode groups of three-phase rectifier. This made it possible to improve the weight and dimensions of the regulated channel in the voltage boost mode and to increase its energy efficiency. It was found that the influence of voltage boost and voltage decrease modes on the calculated power of the permanent magnet generator is equivalent. Attention is focused on the fact that the greater the multiplicity of changes in the permanent magnet generator shaft speed, the greater the installed power of both permanent magnet generator and electronic transformer devices voltage stabilization. Although the installed capacity of the electronic transformer devices in the reversible voltage booster cannel version is less than that of the voltage booster channel, the losses in them are greater. As a result, taking into account the cooling devices, the mass of the reversible voltage booster channel and voltage booster channel can be approximately the same.