With the eddyNCDT 3060, Micro-Epsilon has developed a powerful displacement measuring system based on the eddy current principle, which combines precision, speed and temperature stability in a unique way. These characteristics are complemented with maximum ease of use and an excellent price/performance ratio. The system shows its strengths primarily with gap measurements in harsh ambient conditions.
The eddyNCDT 3060 system is designed for displacement and distance measurements. Due to its robust design and high measurement accuracy, the system is used to monitor the lubricating gap and thermal expansion, as well as to determine shaft movement and radial run out of machine parts and drive components. Factory-calibrated for either ferromagnetic or non-ferromagnetic materials, the inductive displacement measuring system consists of a compact controller, a sensor and a cable. With more than 400 compatible sensor models, high speed and smart signal processing, the eddyNCDT 3060 product series from Micro-Epsilon defines a new performance class in inductive displacement measurement.
The powerful eddyNCDT 3060 eddy current displacement measuring system is ideal for fast, non-contact displacement measurements onto metallic targets. As sensor and controller are actively temperature-compensated, very high measurement accuracies down to the micrometer range can be achieved even in fluctuating temperatures.
The sensors are designed for ambient temperatures up to a maximum of +200°C and an ambient pressure up to 20bar. The measurements are performed at a frequency response up to 20kHz. The compact controller design as well as the fieldbus connection enable easy integration into machines and systems.
The eddyNCDT 3060 system is designed for displacement and distance measurements. With more than 400 compatible sensor models, high speed and smart signal processing, the eddyNCDT 3060 product series from Micro-Epsilon defines a new performance class in inductive displacement measurement.
Another particularity feature of note is the distance-independent multi-point calibration which enables the customer to carry out field linearization in addition to the factory-calibration. The measurement accuracy can even be increased using the DT3061 controller model for a 5-point linearization. Furthermore, the DT3061 offers switching outputs and temperature outputs and allows the storage of multiple characteristic curves. Parameter set up is performed via a modern, user-friendly web interface that is accessed via an Ethernet interface.
The eddyNCDT 3060 eddy current measuring system also shows its strengths when analyzing the gaps in axial piston pumps, where sensors monitor the gasket gaps in very limited space while being exposed to high rotational speeds and harsh ambient conditions. Axial piston pumps convert mechanically generated kinetic energy into hydraulic energy. This means they are often used in slow-moving machines that simultaneously perform, in addition to their motion, hydraulic movements such as lifting, turning or gripping, for example via blades or crane booms. Inside the pump, a cylinder with a piston rotates between two fixed plates in order to build up hydraulic pressure. These plates can be used to control the desired pressure by regulating the flow opening.
To ensure that the connected mechanical parts can rotate optimally and for as long as possible, friction should be minimal. Therefore, narrow gaps between the components ensure the best sliding properties. Most of these gaps are under 20 microns wide, sometimes even less than 10 microns. In addition to reducing friction, these so-called sealing gaps also have the task of keeping the hydraulic oil in circulation and thus significantly influence the mode of operation of the machines. Changes in the gap can lead to pressure loss or a pump failure. The behavior of the gap is therefore measured on the test rig in order to optimize the design of the pump.
So far, gap measurements inside the pumps were not possible because of the extreme requirements. The sensors used deliver precise results even when exposed to high rotational speeds, high pressures and temperatures above 100°C. Furthermore, the pumps are extremely compact, which significantly limits the space available for integration of sensors. Thanks to the extremely small sensor designs and their high pressure and temperature stability, the eddyNCDT inductive miniature sensors are ideal for this application. The eddyNCDT 3060 eddy current measuring system is therefore used on the test rig for evaluating the pumps. As a result, micrometer gap measurements can be achieved from which ultimately analyses can be made in order to optimize the efficiency of axial piston pumps.
To date, bearing gaps were measured during standstill. Inductive sensors based on eddy currents from Micro-Epsilon acquire the measurement values during plant operation, thereby enabling reliable, cost-saving real-time analysis.
Monitoring the oil gap in hydrostatic bearings is also a task for the eddyNCDT 3060 measuring system. Hydrostatic bearings are used in large plant and machinery such as stone mills and telescopic installations. Monitoring the gap size in these bearings is a critical factor, as any disturbances in the hydraulics can cause pressure drops, which in extreme cases, can cause the gap to close, resulting in damage to the bearings and ultimately system failure. In order to be able to retrofit older plants, the measuring system used which is fixed on the bearing shoe must be easy to install. Due to the long service life and the worldwide use of these plants, the sensor should be easy to replace.
For this reason, non-contact eddy current displacement sensors of the eddyNCDT 3060 series are used. Decisive factors for the measurement task are good repeatability and high temperature stability. These sensors have a robust, compact design. The plant is operated outdoors where splash oil and water is present.
Wind turbines typically have two main bearings in which the rotor shaft runs. Due to safety and cost reasons, wind turbines require 24/7 monitoring.
Monitoring the bearing gap between the bearing surface and the drive shaft is one of the primary objectives. An oil film in the lubricating gap prevents direct contact between the bearing surface and the shaft. Improved sliding properties of the bearing increase the turbine’s effectiveness while prolonging its service life. The sliding properties mainly depend on the width of the bearing gap. Based on the size of the bearing gap, conclusions can be drawn about the wear. This is because when the gap width is reduced, less oil covers the bearing surface and the component wear increases. This would lead to high temperatures, rapid wear and to bearing damage. In the worst case, the plant comes to a standstill which results in high service costs.
To date, bearing gaps were measured during standstill based on a tactile principle. Inductive sensors based on eddy currents from Micro-Epsilon acquire the measurement values during plant operation, thereby enabling reliable, cost-saving real-time analysis. The sensors can be used in the test bench and in high volume applications. Serial use is ideal as the sensor technology can already be aligned and precisely adjusted during installation and initial operation.
Monitoring the oil gap in hydrostatic bearings is also a task for the eddyNCDT 3060 measuring system. Decisive factors for the measurement task are good repeatability and high temperature stability. These sensors have a robust, compact design.
In contrast to conventional inductive sensors, displacement sensors based on eddy currents from Micro-Epsilon stand out due to their high accuracy, frequency response and temperature stability. The sensors are suitable for use at ambient temperatures of up to 200°C. Furthermore, the sensor and the controller are actively temperature-compensated at the factory while providing reliable measurement results even with fluctuating temperatures. The sensors are insensitive to dirt, pressure and oil which is why they provide highly accurate results in ambient pressure up to 20 bar.
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