DESIGN OF 20 kN·m TORQUE STANDARD MACHINE AT NIM

Zhang Zhimin, Zhang Yue, Meng Feng, Li Tao, Ji Honglei

Abstract

A 20 kN·m torque standard machine has been designed and developed at National Institute of Metrology (NIM) since 2012. The torque standard machine adopts the lever-deadweight type, the air bearing with low friction is adopted to support the arm lever at the fulcrum, the invar alloy with the low expansion coefficient is used as the material of the arm lever, the weight suspension part and weight loading system are specially designed to ensure the force generated by the weights is applied accurately and reliably. 20 kN·m torque standard machine is capable of realizing the torque from 100 N·m to 24 kN·m both in clockwise and anti-clockwise direction. This paper introduces the mechanical structures and the electrical control system of the machine.

Keywords

torque standard machine, air bearing, arm lever, weight loading system

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IMEKO-WC-2015-TC3-096.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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