Radial Halbach Magnetic Bearings

摘要

Radial Halbach magnetic bearings have been investigated as part of an effort to develop increasingly reliable non-contact bearings for future highspeed rotary machines that may be used in such applications as aircraft, industri-temporal variation of the magnetic field intercepted by the stator coils induces electric currents, thereby generating a repulsive electromagnetic force. The circuits of the stator coils are typically closed by inductors, (he values of which are chosen to modify the phase shifts of voltage and currents so as to maximize the radial repulsion. Above a critical speed that depends on the specific design, the repulsive force is sufficient to levitate the rotor. During startup, shutdown, and other events in which the rate of rotation falls below the critical speed, the rotor comes to rest on an auxiliary mechanical bearing.