Affiliation:
1. Department of Electrical Engineering Government Engineering College Jhalawar, Rajasthan, India
2. Department of electrical engineering Indian Institute of Technology, BHU, Varanasi, India
Abstract
Background:
Axial-flux permanent magnet synchronous generators (AFDS PMSG) have
been found suitable in wind energy conversion system and electric vehicle owing to its compactness,
high torque capability at low speed, high torque to inertia ratio, modular geometry, and high
magnet usability index. Such applications require the generator to operate in Extended Speed Range
(ESR). In ESR, voltage regulation is achieved by generator field-weakening. Usually, negative daxis
current is injected in the armature winding of the generator to achieve field-weakening. However,
in the axial-flux machine field-weakening by current injection is not substantial due to the low
inductance of the machine and use of permanent magnets with high coercivity. We have revised all
patents related to field-weakening methods applied to axial-flux permanent magnet generators.
Methods:
Therefore, this paper emphasizes field-weakening using mechanical methods. This paper
compares the performance of AFDS PMSG topologies based on its mechanical-field-weakeningbased
voltage regulation capability. In this paper, generator field-weakening is achieved by angularly
displacing, one of the stators with respect to the other via a mechanical actuator.
Results:
The experimental results show that during voltage regulation of the DS PMSG with perfectsinusoidal
back-emf characteristic, least amount of harmonics is injected in the generated output
power.
Conclusion:
Thus, the same is best suited to design an automotive generator based on MFW method
for wind energy conversion system and electric vehicle running in ESR.
Publisher
Bentham Science Publishers Ltd.
Cited by
3 articles.
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