1Kg weighing system with an electro-magnetic force restoration

In this paper, a weighing system with an electromagnetic force restoration is introduced. The systems are widely used in industry and especially in research laboratories. These sensors have a shorter response time compared to the strain gauge load cells. This feature of the sensors has made it suitable for dynamic weighing. In addition, EMFR systems operate independently of the elastic component in measurement. This feature eliminates effects such as fatigue of the elastic structure in the measurement. The proposed weighing system is designed based on the structure of two levers and has 3 mechanical, electrical, and electromagnetic parts. The measuring capacity of the proposed weighing system is 1 kg and its accuracy is 1 gr. In this system, a leaf flexure hinge has been used, which has increased the sensitivity of the system by 5 and 2 times compared to the hyperbolic type and circular type flexure hinges, respectively. The mechanical part of the system is integrally made of steel alloy, and the electromagnetic compensator consists of a coil with a ferrite core and the displacement can be detected through an optical switch.