Design and evaluation of a 1.2 kVA single phase rotary transformer

Zietsman, Nikita L.; Gule, Nkosinathi

doi:10.1109/icelmach.2016.7732717

Cited by 3 publications

(7 citation statements)

References 13 publications

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“…The 1‐kVA RT designed in Ref. had a core cross‐sectional area A c of 114 cm 2 where simple transformer design processes were followed together with the RT design steps provided in the literature. The new design methodology yields a cross‐sectional area of almost a third less for a slightly higher power rating.…”

Section: 2‐kva Rt Designmentioning

confidence: 99%

“…A factor of 15% is chosen, which is based on experience during the building of the previous prototype in Ref. . Note that necessary cooling casing is not included.…”

Section: 2‐kva Rt Designmentioning

confidence: 99%

“…The previous prototype built in Ref. proved complicated to assemble, and the achieved stacking factor of the laminations, especially on the inner secondary core section, was very low as shown in Fig. .…”

Section: Design Evaluationmentioning

confidence: 99%

“…From Ref. , it is evident that the large air gaps between the laminations caused problems during the RT experimental testing. In order to overcome this limitation, smaller ‘inter‐laminar’ laminations are placed between the existing laminations.…”

Section: Design Evaluationmentioning

confidence: 99%

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Evaluation of a single‐phase 50‐Hz axial rotary transformer for DFIG systems

Zietsman

Gule

2017

IEEJ Transactions Elec Engng

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In this paper, a comprehensive analytical design methodology for a single-phase axial rotary transformer (RT) is presented. The proposed procedure is designed to yield the minimum RT volume or size while at the same time offer adequate efficiency. Furthermore, the proposed methodology is used in the design and evaluation of a 1.2-kVA single-phase axial RT. The developed prototype proved that the methodology leads to a significant reduction in size as compared to a prototype designed using standard methods. The measured efficiency of this transformer is found to be 91.4%. The presented design methodology can be easily extended to a three-phase RT that can be applied in place of slip rings in brushless doubly fed induction generators (DFIGs). This could reduce maintenance downtime in the operation life of the DFIG.

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Section: 2‐kva Rt Designmentioning

confidence: 99%

“…A factor of 15% is chosen, which is based on experience during the building of the previous prototype in Ref. . Note that necessary cooling casing is not included.…”

Section: 2‐kva Rt Designmentioning

confidence: 99%

Section: Design Evaluationmentioning

confidence: 99%

Section: Design Evaluationmentioning

confidence: 99%

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Evaluation of a single‐phase 50‐Hz axial rotary transformer for DFIG systems

Zietsman

Gule

2017

IEEJ Transactions Elec Engng

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“…There are some examples of application of wireless power transfer based on inductive coupling in rotating electrical machines. Indeed, sliprings can be substituted by rotary transformers in wound rotor induction machines (see [5][6][7]) as well as in synchronous ones (see [8]). In particular, this paper focuses on the design of a rotary transformer suited for installations on large shafts, which are typical of automotive [9], railway [10], naval, aerospace [11,12], or some industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Design of a Rotary Transformer for Installations on Large Shafts

Toscani

Brunetti²,

Carmeli

et al. 2022

Applied Sciences

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Rotary transformers are adopted to transfer energy from primary to secondary in situations in which the two sides are in relative rotation. These devices are cylindrical transformers with two cores and the corresponding winding separated by an air gap. Their employment became quite convenient with the availability of power electronics, allowing the operation of electrical systems at relatively high frequencies. In particular, this paper proposes the design of a light and efficient transformer which can be used in applications involving large shafts. Moreover, a sliced arrangement for the magnetic core is proposed together with the experimental validation of this solution on a reduced-size prototype.

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Design and Evaluation of a Laminated Three-Phase Rotary Transformer for DFIG Applications

Botha

Gule

2022

Energies

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In doubly fed induction generators (DFIGs), the rotor is excited through slip-ring and brush assemblies. These slip-ring and brush assemblies often require frequent routine maintenance, which affects the reliability of the DFIG. Alternatively, a contact-less energy transfer system, such as a rotary transformer, can be utilized in place of the slip rings. In DFIGs, the rotor frequency is very low, under 5 Hz, and this can lead to a huge rotary transformer since the transformer size is inversely proportional to its operating frequency. However, in a rotor-tied DFIG, whereby the rotor is connected directly to the grid whilst the stator is connected to a back-to-back converter, the rotor frequency becomes the grid frequency and can lead to a reasonably sized rotary transformer. In this paper, the design methodology of a three-phase rotary transformer that can be used in rotor-tied DFIG applications is proposed. The rotary transformer is coupled to the power windings of the rotor-tied DFIG and can improve its reactive power capabilities. The proposed methodology is validated with finite element analysis in 3D and can be used for an efficient design process with the proposed error correction. The proposed methodology is then applied in the design of a 6 kVA rotary transformer. Remarkable practical results are presented to demonstrate the effectiveness of the methodology. The rotary transformer is subsequently coupled to a rotor-tied DFIG and an acceptable performance is demonstrated for the entire system.

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Design and evaluation of a 1.2 kVA single phase rotary transformer

Cited by 3 publications

References 13 publications

Evaluation of a single‐phase 50‐Hz axial rotary transformer for DFIG systems

Evaluation of a single‐phase 50‐Hz axial rotary transformer for DFIG systems

Design of a Rotary Transformer for Installations on Large Shafts

Design and Evaluation of a Laminated Three-Phase Rotary Transformer for DFIG Applications

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