The magnetic damper, also known as a tension controller, tensioner or brake, is a device that achieves vibration damping by utilizing the force exerted by a magnetic field on a moving conductor. This device generates an induced current in the conductor as it moves within the magnetic field, absorbing vibration energy. It is mainly applied in equipment such as baling machines, drawing machines, and winding machines in the wire and cable, and optical fiber cable industries, for stable tension control [1] [3-4]. Its structure includes a magnetic cylinder, a rotating shaft, an alloy plate, and a magnetic plate. It adopts a non-contact design to avoid sliding friction and has the characteristics of long service life, convenient torque adjustment, and compact multi-directional installation [3-4].
The output torque of the magnetic damper is adjusted through a scale. It is recommended to set the scale value above 4 to avoid force pulsation. It needs to be combined with calibration steps to eliminate abnormal vibrations [3] [5]. This device has a significant vibration reduction effect near the system’s natural frequency, but it has limitations in controlling vertical vibration and defects in the damping coefficient due to uneven magnetic field, and the vibration transmission rate increases when the external vibration frequency exceeds the multiple of the natural frequency [1-2] [5]. During use, it is necessary to avoid disassembling the magnetic stone components to prevent damage to brittle materials.