The application of eddy current sensors in the high-speed detection of suspended rotating shafts

In industrial production, the application of high-speed rotating machinery is becoming increasingly widespread, such as in aerospace, automotive manufacturing, and energy generation, etc. The suspended rotating shaft, as the core component of high-speed rotating machinery, its performance and condition directly affect the operational efficiency and reliability of the entire equipment. Therefore, conducting high-speed detection on the suspended rotating shaft is of extremely significant importance. The eddy current sensor, as a non-contact displacement, speed and vibration measurement sensor, has unique performance advantages and has been widely applied in the high-speed detection of suspended rotating shafts.-Sensor for High Speed Detection of Suspension Shaft

The working principle of eddy current sensors

Eddy current sensors operate based on the principle of electromagnetic induction. When the coil of the sensor is excited by an alternating current, an alternating magnetic field is generated around it. If a conductive object is placed in this magnetic field, an eddy current will be generated inside the conductive object. These eddy currents will in turn affect the impedance of the sensor coil, and the change in impedance is closely related to the distance between the conductive object and the sensor coil. By measuring the change in coil impedance, the position of the conductive object can be accurately determined. In a suspended shaft system, the shaft is usually made of metal, so it can act as a conductive object. Eddy current sensors can be conveniently installed near the shaft to monitor the displacement, vibration, and other parameters of the shaft in real time.

Advantages of eddy current sensors in high-speed detection of suspended shafts

1. Non-contact measurement: Eddy current sensors do not need direct contact with the measured shaft, avoiding wear and interference caused by contact, thereby improving the stability and reliability of the measurement, especially suitable for the detection of high-speed rotating shafts.

2. High precision: Modern eddy current sensors have high resolution and accuracy, capable of precisely measuring small displacement changes, which is very important for detecting the tiny vibrations and position deviations of suspended shafts, helping to promptly detect potential fault hazards.

3. Strong anti-interference ability: Eddy current sensors have good resistance to electromagnetic interference, can work stably in complex industrial environments, and are not affected by surrounding magnetic fields and electromagnetic noise, ensuring the accuracy of measurement data.

4. Fast dynamic response speed: Can quickly respond to the high-speed movement and transient changes of the shaft, providing accurate detection data in real time, which is crucial for real-time monitoring and control of the operating state of the suspended shaft, effectively avoiding equipment damage caused by delay.

5. Easy installation: The sensor has a small size and is flexible to install. It can be installed at the appropriate position according to different suspended shaft structures and detection requirements, without occupying too much space, and the installation process is simple and quick, reducing the difficulty and cost of system integration.

Application of Eddy Current Sensors in High-Speed Detection of Suspended Rotating Axes

1. Magnetic Levitation Bearing System

Magnetic levitation bearings are a new type of bearing that suspends the rotor using magnetic force. They have advantages such as no contact, no wear, and low energy consumption. In the magnetic levitation bearing system, eddy current sensors are widely used for rotor position detection and vibration monitoring. By installing multiple eddy current sensors radially and axially, the displacement and vibration of the rotor in all directions can be monitored in real time. These data are fed back to the control system, and the control system adjusts the current of the magnetic levitation bearings based on the signals from the sensors to maintain the stable suspension of the rotor.

2. High-Speed Motor Rotor

The high-speed rotation of a motor rotor generates large centrifugal force and vibration, which places high demands on the strength and stability of the rotor. Eddy current sensors can be used to monitor the vibration amplitude and frequency of the high-speed motor rotor, and promptly detect problems such as rotor imbalance and misalignment. Through real-time monitoring of the rotor vibration, measures can be taken in advance for adjustment and maintenance to avoid motor damage due to rotor failure.

3. Aerospace Engine Rotating Axes

The rotating axes of aerospace engines operate under extreme conditions of high temperature, high pressure, and high speed, and their performance and reliability directly affect flight safety. Eddy current sensors play an important role in the detection of aerospace engine rotating axes, used to monitor parameters such as vibration, displacement, and rotational speed of the rotating axes. These data are crucial for engine health management and fault diagnosis.

The eddy current sensor, with its advantages such as non-contact measurement, high precision, strong anti-interference ability, fast dynamic response speed and convenient installation, can provide strong support for the stable operation, fault prevention and health management of equipment in scenarios such as magnetic levitation bearing systems, high-speed motor rotors and aerospace engine shafts. Thus, it promotes industrial production to develop in a more efficient and reliable direction.