DEVICE FOR MEASUREMENT OF TEMPERATURE OR OTHER PHYSICAL QUANTITIES ON A ROTATING ASSEMBLY WHERE THE TRANSMISSION OF SIGNAL AND ENERGY BETWEEN ROTATING AND STATIONARY PARTS IS ACHIEVED BY MEANS OF CONTACTLESS TRANSMISSION

摘要

The present invention describes a device for measurement of temperature or other physical quantities in one or more test points where the transmission of signal and energy between a rotating mechanical element (1) and a stationary part of a system (5) is realized by contactless transmission, wherein a contactless signal transmission is based on a differential capacitive coupling, and a contactless energy transmission is based on an inductive coupling. The device comprises an electronic measurement module (3) installed on the rotating element (1), where said measurement module (3) processes signals from one or more temperature sensors1-n (2) attached to the rotating element (1), where said temperature sensors1-n (2) are wired to the electronic measurement module (3), and a receiving stationary electronic module (4) installed on the stationary part of the system (5). The electronic measurement module (3) is positioned on a part of a surface of the rotating element (1) where the lowest working temperatures are expected, wherein the electronic module (3) has dimensions which do not interfere with the function of the rotating mechanical element (1). The present invention provides measurement of high operating temperatures on a rotating clutch component by using resistive sensors, providing a low installation space occupancy and a small mass of a measurement circuitry on the rotating element (1). The minimum space occupancy and small mass are achieved by a concept which allows ultra low power operation of the measurement module (3), the concept enabling utilization of small elements for contactless energy transfer, particularly receiving coils for collecting energy from the magnetic field. Ultra low power consumption is achieved by using resistive temperature sensors, low power sensor signal modulator, signal transmission based on the differential capacitive coupling, and power supply that allows operation from low input voltages induced in the receiving coil for collecting the energy from the magnetic field. The concept of said device also provides the possibility of implementation of a measurement system based on electronic components from the extended temperature range, while retaining a high measurement accuracy.