Development and Analysis of the Magnetic Circuit on Double-Radial Permanent Magnet and Salient-Pole Electromagnetic Hybrid Excitation Generator for Vehicles

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 electromagnetic 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.

Magnetic circuit design for the performance experiment of shear yield stress enhanced by compression of magnetorheological fluids

“…Considering the magnetic circuit with an air gap, the magnetic leakage coefficient ξ i can be introduced. The magnetic fluxes in different regions can be derived as where the value ξ i is different according to the shape/size of the magnetic circuit and it is often in the range of 2–2.5 23 , 24 . Therefore, according to Eqs.…”

Development of Brushless Claw Pole Electrical Excitation and Combined Permanent Magnet Hybrid Excitation Generator for Vehicles

“…To sum up, researchers have carried out in-depth research on parallel-structure HEGs and achieved certain research results that provide useful reference for the research and development of high-performance HEGs [18][19][20][21][22][23][24]. On this basis, this paper proposes a HEG with suspended brushless claw pole EER and combined magnetic pole PM rotor coaxially connected in parallel and sharing the same armature winding.…”

Simulation Calculation of the Magnetic Torque of Dual Mode Permanent Magnet Transmission Based on Magnetic Circuit Analysis

“…A novel topology of a planetary magnetic gear having only two rotating parts demonstrated a torque density of 187 kN • m/m 3 [11]. The air-gap magnetic fields and eddy-current densities of a non-rotary mechanical flux adjuster (MFA) were investigated under the different shifting distances of a MFA, which reveals the fairly good torque regulation effects [12]. 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.…”