Final Report Summary - NEELEFFECTINTHESKY (Magnetic Sensors with No Remanence for Aircraft Application) Executive Summary:The current and voltage sensors for aerospace applications are conventionally shunt or resistive dividers, Hall sensors (open loop or closed loop) and transformers (VT and CT). Increasing onboard electrical power in aircrafts requires additional numerus and novel power équipements which implies a large increase in the number of sensors. These sensors are used for power control, for protection (overcurrent and overvoltage detection or leakage current), and for the management of energy storage means. The evolution of loads, sources and storage means requires the use of mixed networks DC and AC. Thus, sensor must allow measurement for DC and AC.Existing solutions have certain drawbacks, in general size and weight when the sensors are accurate. The required accuracy is of the order of 1% over a temperature range from -60 °C to + 125 °C.Project Context and Objectives:The objective of this project is to leverage on a breakthrough nanotechnology called Neel Effect® invented by a French SME, Neelogy, for high performance isolated magnetic sensors with no remanence, and adapt it for harsh environmental avionics constraints (high amplitude variation of operating temperature -60° to +125°C, depression, humidity, vibration and EMI/EMC constraints). The same technology will be used for both current and voltage sensors. Neelogy is the only participant to this project, but they are supported by subcontractors, who are experts in avionics standards and recommendations, especially for the electronics parts. The project duration is 42 months. The goal is to have 5 prototypes of current sensors and 5 prototypes of voltage sensors at the end of the project, as requested in the Call for Proposal. With regard to commercial products, the objective is to have them available 1 to 2 years after the end of the projectProject Results:Description of workThe project is organized in 16 Work Packages, in summary: - simulation tools,- test benches,- design of measurement heads for Current and for Voltage,- design of discrete analog and digital electronics,- design of mechanical parts,- test of mock-ups and prototypes,- design of PCB,- specification of ASIC.A scientific project manager, as well as a project coordinator have been assigned.Project expenses finally amount to 631k€ (592k€ for Research & Technology Development, 27k€ for Demonstration, and 12k€ for Management), spread as follows: 88% to Neelogy and 12% to Neelogy’s subcontractors. It represents an effort of 72 Person-Months for Neelogy. Resultsa) Timeline & main milestonesThe timeline has been modified during the project and finally all the workpackage have been done. The final duration of the project was 42 months.Specification for the mock-up, prototype and product has been defined @ t0+6 months.A specific development tool (simulation) has been developed over the all project. First version was available @ t0+ 12 months.A mock-up for current measurement has been designed, realized and tested @ t0+ 18 monthsA special setup for voltage characterization has been developed @ t0+18 months.A mock-up for voltage measurement has been designed, realized and tested @ t0+ 24 monthsA new electronic has been designed, realized and tested @ t0+ 36 monthsAn integration study into a power converter has been done @ t0+ 40 monthsPotential Impact:Environmental benefits:The demonstrators are very interesting in term of mass of the sensor. The transducer mass is few tens of grams for a closed loop magnetic sensor of 1kA. This sensor is a key enabler towards the more-electrical aircraft of the future, more safe and more respectful of environment.Maturity of works performed:The prototype allows to validate the advantages of the Neel Effect® technology. The work has permitted to prove some important specification of the sensors, such as:- The frequency bandwidth finally reaches 20kHz- the total power consumption finally reaches less than 1W for a closed loop 1,000 A sensor,- the immunity to a specific perturbation, even without magnetic shield,- the possibility to integrate electronics in an ASIC- the good accuracy over a wide temperature range- the small size and mass of the transducer- the possibility to use the same electronic for a voltage and a current sensor.However, the following points have not been treated during this project:- the design of the transducer for voltage insulation up to 10kV- the design of the transducer to reduce current injection due to high dV/dt of the primary conductor.- the realization of a very compact electronics (ASIC)It has been decided by the contractor to continue to develop the Neel Effect® technology to improve this three last points and finally propose a product for aircraft customers.List of Websites:www.neelogy.comRelevant contact:Lionel CimaChairman & CEO Neelogy+33(0)6 76 83 83 40lionel.cima@neelogy.com Powiązane dokumenty final1-neeleffectinthesky_publishable-summary_v4.pdf
