A magnetic bearing is not a standalone component; it is a system. The magnetic bearing systems market includes the bearings themselves, the control electronics, and the backup systems.
The Components of a System
The [LSI keyword: magnetic bearing systems market] includes: the magnetic bearing actuator (electromagnets and laminations), position sensors (eddy current or inductive), the controller (digital signal processor, analog-to-digital converters), and the power amplifier (converts low-power control signal to high-power current for the magnets). The magnetic bearing systems market for "digital" controllers (with fieldbus communication) is standard; for "analog" controllers (older) is declining. The magnetic bearing systems market also includes a backup power supply (batteries or a capacitor bank) to keep the rotor levitated during a power loss (so it can coast to stop without touching the auxiliary bearings). The magnetic bearing systems market for "fail-safe" design (auxiliary mechanical bearings that support the rotor when the magnetic bearing is de-energized) is essential.
The magnetic bearing systems market is segmented by system size (power rating, from kW to MW), by number of axes (radial bearings and axial/thrust bearings), and by application. A typical system has two radial bearings (supporting the rotor laterally) and one axial bearing (supporting axial thrust). The magnetic bearing systems market for "integrated" systems (where the controller is built into the bearing housing) is growing, reducing cabling and footprint.
Controller Algorithms
The magnetic bearing systems market relies on sophisticated control algorithms. PID (proportional-integral-derivative) control is the standard. The magnetic bearing systems market for "adaptive" control (tuning itself to changing rotor dynamics) is used for high-speed machines that cross critical speeds. The magnetic bearing systems market for "H∞" (robust control) is used for applications with varying load. The magnetic bearing systems market for "decentralized" control (each bearing controlled independently) is simpler; for "centralized" control (one controller managing all bearings) it is more complex but can achieve better performance. The magnetic bearing systems market for "redundant" controllers (two independent controllers for each bearing, for safety) is used in critical applications (e.g., nuclear power, oil and gas).
As the magnetic bearing systems market continues to evolve, the focus will be on reducing the size and cost of the control electronics, on improving reliability (using fault-tolerant designs), and on integrating with the machine's main control system (e.g., via Profibus, Modbus). The magnetic bearing system is a mechatronic marvel, combining magnetics, sensors, and software.
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