Torque and back-emf in hybrid excited claw pole generator
ISSN: 0332-1649
Article publication date: 17 August 2018
Issue publication date: 16 October 2018
Abstract
Purpose
The paper aims to present the hybrid excited claw pole generator design, simulation and experimental results. The prototype has claw poles on two rotor sections, between which an excitation coil is located. The innovation of this machine is permanent magnets location on claws of one part of the rotor. The paper presents construction of the machine and analysis of the current in the excitation control coil influence on the electromagnetic torque, cogging torque and back-emf values. Presented studies enabled the determination of the torque and the back-emf for both: the strengthening and the weakening of magnetic field.
Design/methodology/approach
In the study, finite element analysis was used to perform simulation research. Then, based on the simulation studies, an experimental model was built. The paper also presents selected experimental results.
Findings
Achieved results show that the proposed machine topology allows to eliminate the disadvantages mentioned in paper, i.e. necessary to introduce special areas inside the machine to limit magnetic flux leakage or its complicated construction.
Research limitations/implications
The obtained cogging torque values and back-emf pulsation are still relatively high. In the near future, some of known techniques for reducing these pulsations can be applied, including the use of magnetic wedges, changing shapes of rotor’s poles and/or skewing of permanent magnets.
Practical implications
The proposed solution can be used in wind turbines as a generator.
Originality/value
The paper presents an original design of a new construction of a hybrid-excited claw pole machine and also an excitation current influence on cogging torque and back-emf values.
Keywords
Acknowledgements
This work has been supported with the grant of the National Science Centre, Poland, 2015/17/B/ST8/03251.
Citation
Wardach, M. (2018), "Torque and back-emf in hybrid excited claw pole generator", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 37 No. 4, pp. 1342-1353. https://doi.org/10.1108/COMPEL-08-2017-0365
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited