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An electrical transformer with only one winding is known as an autotransformer (or auto transformer). Both the primary winding and the secondary winding are made of the same winding. However, the primary and secondary purposes of a two winding transformer are served by two separate windings.
The ability of an autotransformer to conserve copper is its most notable attribute. An autotransformer uses less copper than a two winding transformer with the same ratings. As a result, it lowers the amount of capital needed for construction. The autotransformer’s size and weight are greatly decreased by the use of a single winding.
The autotransformer’s tiny size and light weight enable it to have a higher VA rating than a conventional two winding transformer for the same amount of material. Because the losses in the second winding are gone, voltage regulation is significantly better than with a two-winding transformer.
The Global aircraft auto transformer unit market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
From a three-phase, 115 V, 400 Hz generator, the Wartsila Model 2030 Transformer Rectifier Unit (TRU) transforms aircraft primary AC power to 28 Vdc power. Low ripple DC output is provided through a 12-pulse rectification.
No forced air cooling is required because cooling is accomplished by thermal conduction through the ground plate. Since there are no blowers, operation is highly reliable and completely maintenance-free.Low unit life-cycle costs are guaranteed by these variables.
A power conversion device called the Auto Transformer Unit (ATU) converts 230VAC power into the more common 115VAC power that most aircraft equipment can use. Offering a variety of ATUs with high efficiency and minimal weight impact is Safran Electrical & Power.
In keeping with tradition, ELDEC auto-transformer rectifier units offer inexpensive, effective, lightweight, and dependable converters that also satisfy today’s more stringent power quality requirements. When the source frequency is 400 Hz, Crane Aerospace & Electronics’ ATRUs are preferred to active PFC.
Under sponsorship from THALES Avionics Electrical Systems, CPES actively contributed to the development of multi-pulse ac-dc power conversion by creating 18-pulse autotransformer rectifier units (ATRU). Two distinct ATRU varieties—symmetric and asymmetric—were created.
Symmetric ATRU topologies have already been adopted by the industry for various ac-dc applications as a result of CPES proposals, but the adoption of the 40% lighter asymmetric ATRU types developed by CPES is still dependent on the industry’s final manufacturing capacity because this topology is a great deal more vulnerable to parasitics in the autotransformer, particularly leakage inductance.
RECENT PARTNERSHIP
In order to provide dependable power conversion for the Horizontal Stabilizer Control Unit (HSCU) provided to aircraft manufacturer Embraer, Crane Aerospace & Electronics Power Solutions unit has partnered with Rockwell Collins. With a power factor correction, Crane Aerospace’s AC-DC multi-pulse ATRU can convert 115 VAC, 400 Hz, 3-phase input power to 135 Vdc with a conversion efficiency of over 95% at a continuous load of 1.5 kW.
Together, Thales and Safran Landing Systems are working to optimise power conversion for the electric taxiing system, a ground-breaking idea that will help to further boost the efficiency of aircraft fleets in terms of cost and the environment. The high-power ATRU (Auto Transformer Rectifier Unit) from Thales was chosen by Safran Landing Systems because of its exceptional performance and optimised power to weight ratio.
In order to adjust the design and optimise the interfaces for use in the electric taxiing system, the partners will collaborate on the integration of the Thales ATRU. Airlines will be able to choose the system from Safran Landing Systems, especially for single-aisle aircraft. The project perfectly complements both the US NexGen programme and the European CleanSky initiative.
