초록 ▼

An electromagnetic bearing wherein a group of magnetic poles is formed on each end of a columnar yoke. The magnetic pole groups each include four magnetic poles which protrude from the center of the yoke at right angles to one another and to the longitudinal direction of the yoke. A cylindrical supp

An electromagnetic bearing wherein a group of magnetic poles is formed on each end of a columnar yoke. The magnetic pole groups each include four magnetic poles which protrude from the center of the yoke at right angles to one another and to the longitudinal direction of the yoke. A cylindrical supported body surrounds the yoke and the magnetic poles. A ring-shaped member formed of a ferromagnetic material is fixed to the inner peripheral surface of the supported body so that both end portions of the ring-shaped member are in alignment with the centers of their corresponding magnetic poles of the magnetic pole groups. Magnetic fluxes delivered from each aligned pair of magnetic poles enter the ring-shaped member substantially at right angles to the peripheral surface thereof, and return to those original magnetic poles via another pair of magnetic poles adjacent thereto. Thus, the supported body is supported in its radial direction. Magnetic fluxes pass through the yoke along its longitudinal direction, enter one end face of the ring-shaped member at right angles thereto via the magnetic poles of the first magnetic pole group, pass through the ring-shaped member along its longitudinal direction, and enter the magnetic poles of the second magnetic pole group via the other end face of the ring-shaped member. Thus, the supported body is supported in its longitudinal direction.

대표청구항 ▼

An electromagnetic bearing comprising: magnetic supporting means including an elongated yoke, first and second groups of magnetic poles on the yoke defining an axis spaced along the longitudinal direction of the yoke, each member of said group including a plurality of magnetic poles protruding from

An electromagnetic bearing comprising: magnetic supporting means including an elongated yoke, first and second groups of magnetic poles on the yoke defining an axis spaced along the longitudinal direction of the yoke, each member of said group including a plurality of magnetic poles protruding from the yoke perpendicular to the longitudinal direction of the yoke, first and second groups of coils including a plurality of first and second coils wound around the first and second groups of magnetic poles, each of said coils being adapted to produce magnetic flux along the protruding direction of each corresponding pole, and a third coil for producing magnetic flux along the longitudinal direction of the yoke; and a supported body including a magnetic coupling member formed of a ferromagnetic material, said magnetic coupling member extending along the longitudinal direction of the yoke and having end portions aligned individually with the first and second groups of magnetic poles, whereby magnetic fluxes are formed between the magnetic poles and the magnetic coupling member by the first and second coils and enter and leave the magnetic coupling member in the direction substantially perpendicular to the longitudinal direction of the magnetic coupling member, and magnetic fluxes are formed between the magnetic poles and the magnetic coupling member by the third coil and enter and leave the magnetic coupling member substantially at right angles to the end faces of the magnetic coupling member.