Abstract: A position sensor includes a substrate having a first surface and a second surface opposite to the first surface; an initial shaft passing through the first and the second surfaces of the substrate in a direction perpendicular to the substrate; an initial gear mounted to the initial shaft and positioned above the first surface of the substrate; a first sub-shaft positioned above the first surface of the substrate, and disposed perpendicular to the substrate and parallel to the initial shaft; a first sub-gear mounted to the first sub-shaft and positioned above the first surface of the substrate and rotatably engaged with the initial gear; a first sub-rotor mounted to the first sub-shaft and positioned above the first surface of the substrate; a first sensing coil disposed on the first surface of the substrate; a second sub-shaft positioned above the first surface of the substrate, and disposed perpendicular to the substrate and parallel to the initial shaft and the first sub-shaft; a second sub-gear mounted to

Abstract: A position sensor includes a substrate; a first initial shaft positioned in a first side space defined by a first surface of the substrate; a first initial gear and a first initial rotor mounted to the first initial shaft in the first side space; a sub-shaft passing through the substrate; a first sub-gear mounted to the sub-shaft in the first side space, and engaged with the first initial gear; a second sub-gear mounted to the sub-shaft in a second side space defined by a second surface of the substrate; a second initial shaft positioned in the second side space; a second initial gear and a second initial rotor mounted to the second initial shaft in the second side space, the second initial gear engaged with the second sub-gear; and first and second sensing coils disposed on the first and second surfaces of the substrate, respectively.

Abstract: Disclosed is a heat exchange system between an external plan such as a data center and a water treatment device of a sewage treatment plant. The present system includes a hot-air supply unit that supplies heat generated from the external plant to a reactor using microorganisms in the water treatment device, and a coolant supply unit that supplies treated water discharged from the water treatment device to the external plant as a coolant for heat dissipation of the external plant. It is possible to simultaneously solve various problems in terms of environmental and economic aspects by enabling complementary heat exchange between the external plant and the sewage treatment plant.