Development of scientific fundamentals for an advanced primary standard for the realization and measurement of small torques

在科学和工业中，主要由小型化驱动的对小扭矩实现的需求快速增长，同时减少了不确定性。关键的例子是在许多工业应用中自动安装小型化关节，例如计算机硬件，牙髓设备，假肢，手表等。为了满足这一需求，有一个基本的研究需要建立一个新的一级标准作为一个可靠的可追溯性链的基础。具有挑战性的目标是在1 mNm-1 Nm的标称扭矩范围内达到1 × 10 - 5（k = 2）的扩展相对不确定度Ur，从而克服电流限制一个数量级。德国和芬兰的国家计量研究所PTB和MIKES在建立目前的扭矩测量标准方面发挥了主导作用，代表了最先进的技术水平，领先于世界上其他国家计量研究所。双方都表示有强烈的兴趣在这个项目上进行合作。巴西计量研究所INMETRO也是如此，该研究所开始研究扭矩实现和计量。整合所有合作伙伴在计量、精密工程、机电一体化和精密制造方面的能力，为建立小扭矩测量的新标准提供了独特的机会，从而为德国-巴西生产技术的可持续发展做出了重要贡献。第一阶段的目的是发展先进的测量和实现小扭矩的基本原理。第二个阶段是必要的"概念验证"的基础上，示范设计和建造。

There is a rapidly growing need for small torque realization with reduced uncertainty in science and industry, mainly driven by miniaturization. Key example is the automated mounting of miniaturized joints in many industrial applications, such as computer hardware, endodontic equipment, prosthetics, watches and others. To satisfy this demand there is a fundamental research need to establish a new primary standard as a base for a reliable chain of traceability. The challenging goal is to reach an expanded relative uncertainty Ur, of 1×10-5 (k = 2), for a nominal torque range of 1mNm – 1Nm, thus overcoming the current limitation by one order of magnitude. The National Metrology Institutes of Germany and Finland, PTB and MIKES, played a leading role establishing the present standards of torque measurement, representing the state of the art, ahead of other metrological institutes in the world. Both have declared a strong interest to cooperate in this project. The same is true for the Brazilian Metrological Institute INMETRO that started to investigate in torque realization and metrology. The integration of the competences of all partners in metrology, precision engineering, mechatronics and precision manufacturing offers a unique opportunity to set up new standards in measurement of small torques, thus making an important contribution for the sustainable development of the German-Brazilian production technology. The development of advanced fundamentals in measurement and realization of small torque are intended in the first period. A second period is necessary for a “proof of concept” based on demonstrators to be designed and built.