Abstract
With the improvement of vehicles electrical equipment, the existing silicon rectification generator and permanent magnet generator cannot meet the requirement of the electric power consumption of the modern vehicles electrical equipment. It is difficult to adjust the air gap magnetic field of the permanent magnet generator. Consequently, the output voltage is not stable. The silicon rectifying generator has the problems of low efficiency and high failure rate. In order to solve these problems, a new type of hybrid excitation generator is developed in this paper. The developed hybrid excitation generator has a double-radial permanent magnet, a salient-pole electromagnetic combined rotor, and a fractional slot winding stator, where each rotor pole corresponds to 4.5 stator teeth. The equivalent magnetic circuit diagram of permanent magnet rotor and magnetic rotor is established. Magnetic field finite element analysis (FEA) software is used to conduct the modeling and simulation analysis on double-radial permanent magnet magnetic field, salient-pole electro-magnetic magnetic field and hybrid magnetic field. The magnetic flux density mold value diagram and vector diagram are obtained. The diagrams are used to verify the feasibility of this design. The designed electromagnetic coupling regulator controller can ensure the stable voltage export by changing the magnitude and direction of the excitation current to adjust the size of the air gap magnetic field. Therefore, the problem of output voltage instability in the wide speed range and wide load range of the hybrid excitation generator is solved.
Highlights
Generator is a key component of vehicle power system
According to the relationship between the permanent magnetic potential and the electric field potential, the hybrid excitation generator can be divided into two types: series hybrid excitation generator and parallel hybrid excitation generator
In order to improve the structure of the brush generator, Leonardi et al [10] put forward a kind of permanent magnet and excitation winding are located on the stator of the series hybrid excitation generator
Summary
Generator is a key component of vehicle power system. At present, the main generator used in the vehicle is the silicon rectification generator and permanent magnet generator. In the series hybrid excitation generator, electric field winding is arranged below the permanent magnet of the rotor to form a series structure. According to the different combinations of permanent magnet and electric field winding, the electromagnetic performance and magnetic field regulation ability of the hybrid excitation flux-switching generator with different topologies were compared and analyzed [14, 15]. The generator has no permanent magnet or electric field winding on its rotor, and has many advantages of high power density and high efficiency. Because the electrical excitation part of the generator adopts the claw-pole structure, the additional air gap is large, the magnetic flux leakage is bigger, and the power density is low. The double-radial permanent magnet and salient-pole electromagnetic hybrid excitation generator is developed adopting a combined rotor structure. The rotor pole body height hm is 25 mm
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