Research on a hybrid excitation PM synchronous generator with stator third harmonic winding excitation

Abstract

This study presents a hybrid excitation permanent magnet synchronous generator (HEPMSG) with a stator third harmonic winding to solve the problems of adjusting the air-gap magnetic field of the permanent magnet synchronous machine (PMSM) and simplify the excitation system structure. The electromotive force (EMF) of the stator third harmonic winding, induced by the inherent third harmonic magnetic field in the air gap, provides the adjustable field current for the rotor field winding via the controllable rectification. The proposed machine structure is described, and the generation mechanism and the excitation principle of the stator third harmonic EMF are analysed. The conditions for maximum excitation current output are discussed, and the integrated design methods of the stator third harmonic winding and the rotor excitation winding are described. Based on the finite element method, the performances of the third harmonic excitation system are numerically compared for different stator third harmonic windings, and the open-circuit voltage regulation characteristics under different control angles are analysed. A 2.5 kW HEPMSG prototype with a stator third harmonic winding is manufactured and tested. The predicted and experimental results are in good agreement, which verifies the correctness of the excitation principle of the proposed HEPMSG.

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

“…The installation diagram of EER and the corresponding stator is shown in Figure 2, and the dimensions of the designed claw pole structure are shown in Figure 3. ( ) The thickness of flange plate b m , the yoke diameter D c , and the thickness of claw root a c determine the magnetic flux of the claw pole and the material consumption, which are important parameters of the claw pole structure, and can be calculated as follows [25][26][27]:…”

Electromagnetic Design and Flux Regulation Analysis of New Hybrid Excitation Generator for Electric Vehicle Range Extender

“…Since the installation space of the generator for ER is limited, it is more important to improve the output power and efficiency under the premise that the generator volume remains unchanged. In addition, due to the wide range of engine speed for ER, the generator output voltage is low when the speed is low, and the generator output voltage is high when the speed is high, which affects the normal work of electrical equipment [4,5]. So, it has become the focus of our research to design a generator with high power density and stable output voltage under wide speed and wide load.…”

Control of a Cascaded Permanent Magnet Switched Reluctance Generator for Automobile Generation Application

“…However, due to the inherent characteristics of the PM, the air gap magnetic field is hard to regulated, and the speed and load of the generator are changing at any time, which makes the output voltages of the generator difficult to be stable [4]- [6]. Considering the shortcomings of electro-excitation generators and PM generators, hybrid excitation (HE) generators are proposed, which combine the advantages of electro-excitation generators and PM generators, and then attracts the interest of many researchers [7].…”