A Distributed Winding Wound Field Pole-Changing Vernier Machine for Variable Speed Application

This paper proposes a distributed winding wound field pole-changing vernier machine for variable speed application. The proposed machine uses a wound field rotor with two sets of windings. The direction of current in one set of the field windings is reversed to change the number of poles of the mach...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2019-07, Vol.55 (7), p.1-6
Main Authors: Baloch, Noman, Kwon, Byung-il
Format: Article
Language:English
Subjects:
Coils (windings)
Electromagnetic properties
Finite element method
Harmonic analysis
Magnetism
Pole changing
Product design
Reactive power
Rotors
Synchronous machines
Topology
Torque
Torque measurement
Two dimensional analysis
variable speed
vernier
Winding
Windings
wound field
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Summary:This paper proposes a distributed winding wound field pole-changing vernier machine for variable speed application. The proposed machine uses a wound field rotor with two sets of windings. The direction of current in one set of the field windings is reversed to change the number of poles of the machine. Hence, the machine can run in two modes: a vernier mode and a wound field synchronous machine (WFSM) mode. The electromagnetic characteristics of the machine are thoroughly investigated at base speed initially. Then, the two modes of the machine are combined for variable speed operation. The 2-D finite-element analysis shows that the machine provides the advantages of high torque and high power of a vernier machine until the base speed is reached. After the base speed, the advantages of the WFSM mode are utilized, enabling wide speed range operation and restraining the efficiency of the machine from decreasing abruptly during variable speed operation.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2019.2900470