Abstract
Aiming at the problem of uncontrollable magnetic field of permanent magnet generators, a new hybrid excitation generator (HEG) with parallel magnetic circuit is proposed. The HEG consists of combined permanent magnet rotor (PMR) and brushless electric excitation rotor (EER). The PMR has surface-mounted and embedded magnets. The PMR provides the main air gap field, and the brushless EER is used to adjust the air gap field. The operating principle and electromagnetic design scheme of the proposed generator are given in detail. Besides, the matching with two different types of rotors and the flux regulation characteristics is analyzed by using the finite element method. Finally, the output performance of the proposed generator including no-load and load characteristics and output voltage are tested. The results show that the two different types of rotors can be matched efficiently and operated reliably. The internal magnetic flux is easy to adjust in both directions, and the proposed HEG can output stable voltage in the range of wide speed and load.
Highlights
Extended-range electric vehicles (EREV) have become one of the main directions of the development of new energy vehicles due to the following: energy saving, low pollution, and increase in the longer endurance mileage [1, 2]
In the hybrid excitation generator (HEG), the field winding is placed in the Permanent magnet generators (PMGs). e field winding is used to assist in the adjustment of the permanent magnet (PM) magnetic field
Based on the advantages of the above two kinds of generators, this paper proposes a new type of parallel magnetic circuit hybrid excitation generator (PMCHEG). e permanent magnet rotor (PMR) and the electric excitation rotor (EER) are installed side by side on the same shaft. e PMCHEG can retain the inherent characteristics of PMG to the greatest extent and inherit the performance of field regulation of electric excitation generators (EEGs), which has high research and practical value
Summary
Extended-range electric vehicles (EREV) have become one of the main directions of the development of new energy vehicles due to the following: energy saving, low pollution, and increase in the longer endurance mileage [1, 2]. Traditional electric excitation generators (EEGs) have the characteristics of easy magnetic field adjustment and good power factor controllability. Permanent magnet generators (PMGs) have the advantages of simple structure, high efficiency, low loss, and high power density, and they are widely used in fields of aerospace, national defense, and industrial and agricultural production. E auxiliary ring excitation winding is located in the stator core and the air gap magnetic field is adjustable. The RPM is arranged between the outer ends of two adjacent TPMs. e RPM can make up for the dent of the original air gap magnetic density waveform. The change of excitation current can realize effective adjustment of the induced electromotive force (EMF) of the PMCHEG
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