Abstract
This paper proposes a wound field pole changing vernier machine with fractional slot concentrated winding for electric vehicles application. The main aim of the paper is to utilize the advantages of a vernier machine and a wound field synchronous machine in a single topology using a fractional slot concentrated armature winding. The proposed machine operates in a vernier mode at low speeds and a wound-field synchronous mode at high speeds to utilize the merits of both a vernier machine and a wound-field synchronous machine. The topology, operating principle and pole-changing method of the proposed machine are explained initially. Then, finite element analysis (FEA) is utilized to study the electromagnetic characteristics such as back EMF, torque, wide speed range operation and efficiency of the proposed topology in two modes. Further, a prototype of the machine is manufactured and the FEA results are validated through experiments. The FEA and experiment results show that the proposed machine is a promising candidate for electric vehicles application.
Highlights
The fluctuating prices of the fuel, the limited amount of the natural resources, and the global warming issues has led to massive energy efficiency and sustainability research
It demonstrates that the merits of two machines that is vernier machine and wound-field synchronous machine can be obtained in a single topology using the proposed pole-changing method
The finite element results of the machine were validated by comparing them with experimental results, which proved that the proposed machine can run in the two modes
Summary
The fluctuating prices of the fuel, the limited amount of the natural resources, and the global warming issues has led to massive energy efficiency and sustainability research. The electrification of vehicles is a serious issue in this regard because a large volume of oil is consumed by vehicles. The electric machines for EV application are required to operate on wide speed range and have high power density. They must have high efficiency during wide speed range operation, high torque at low speeds for driving in urban areas and high power at high speeds for cruising [3], [5]
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