Abstract
Compared with the traditional synchronous generator with iron core structure, air-core pulse alternator usually adopts self-excitation to establish a higher field current to meet its demand for high flux density. In this paper, the topology of the self-exciting rectifier is determined to be the full bridge rectifier by discussing the respective application scope of the full bridge and the half wave rectifier. Considering the armature reaction, the self-excitation process and the coupling relationship between the field winding and the armature winding are analyzed. According to the commutation overlap angle, the equivalent circuits of different states are carried out, and the instantaneous expressions of field current and armature current are deduced, which lays a foundation for the following phase control research.
Highlights
Compared with the current more mature capacitor energy storage pulse power supply, air-core pulse alternator energy storage is a form of inertial energy storage
Its air-core structure makes the magnetic permeability in the magnetic circuit almost vacuum, it must have a higher excitation power to meet its demand for high magnetic flux density
The intensity of the magnetic field excited by the permanent magnet excitation method is limited, which is not suitable for the excitation of air-core structures; the additional excitation power supply required for separate excitation leads to a large increase in the system volume; researchers are more tend to adopt selfexciting method to establish the required field current. the self-exciting topology is shown in figure 1
Summary
Compared with the current more mature capacitor energy storage pulse power supply, air-core pulse alternator energy storage is a form of inertial energy storage. It has high power density, and has exceeding high energy storage density [1], it is well suited to compact pulse power supply. The intensity of the magnetic field excited by the permanent magnet excitation method is limited, which is not suitable for the excitation of air-core structures; the additional excitation power supply (such as capacitor) required for separate excitation leads to a large increase in the system volume; researchers are more tend to adopt selfexciting method to establish the required field current. Based on the current research trend of air-core pulse alternator, this article focuses on the structure of rotating-field and two pairs of poles, and assumes that the armature windings are uniformly distributed, and the no-load air gap magnetic field is sinusoidally distributed along the circumference [2]
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