Described is a bearingless motor based upon a homopolar flux-biased magnetic bearing for force generation and a hysteresis motor for torque generation. The bearingless slice motor levitates and rotates a ring-shaped rotor made of a semi-hard magnetic material. The rotor is biased with a homopolar permanent-magnetic flux, on which 2-pole flux can be superimposed to generate suspension forces. Torque is generated by a hysteretic coupling between the rotor and a rotating multi-pole stator field.

An axial bearing device includes an annular electrical sheet arrangement having individual sheets which protrude radially outward. In addition, an electrical coil is provided in the axial bearing device and is inserted into the electrical sheet arrangement to generate a magnetic field in the electrical sheet arrangement. The electric sheet arrangement includes at least two concentric electrical sheet rings. All adjacent electrical sheets of each electrical sheet ring substantially abut at the inner circumference of the respective electrical sheet ring.

The present disclosure relates to a stator of a magnetic levitation bearing, a magnetic levitation bearing, and a compressor. The stator of the magnetic levitation bearing includes a stator core (4), a stator coil (5) wound around the stator core (4), a housing (2) sleeved outside the stator core (4) and having a clearance fit or a transition fit with the stator core (4), and a potting component (3) filled between the housing (2) and the stator core (4).

A magnetic bearing apparatus capable of correcting inclination of a rotating element with a small magnetic attractive force and capable of stably supporting the rotating element is disclosed. The magnetic bearing apparatus includes: a non-magnetic ring made of non-magnetic material; and at least three axial magnetic poles arranged along a circumferential direction of the non-magnetic ring. Each axial magnetic pole has an arc-shaped coil and a coil housing that accommodates the coil therein. The at least three axial magnetic poles are fixed to the non-magnetic ring.

A thrust magnetic bearing includes a coil formed by winding a conductive wire, and a core that houses the coil. The core is provided with a refrigerant inlet and a refrigerant outlet. A refrigerant flow path connecting the refrigerant inlet and the refrigerant outlet is provided between the coil and the core. The refrigerant flow path is formed so that a refrigerant flowing from the refrigerant inlet to the refrigerant outlet mainly flows along the coil in a winding direction of the coil.

A magnetic levitation device includes a magnetically effective core and a stator including coil cores. Each coil core includes a longitudinal leg and a transverse leg at an end of the longitudinal leg. A concentrated winding surrounds each longitudinal leg. The stator has a cup-shaped recess to receive the rotor. The transverse legs are arranged around the cup-shaped recess. First and second holding device and a second holding device are connected to each other, The first holding device includes a bottom plate on which holding elements are provided, which extend in the axial direction and receive exactly one of the longitudinal legs. The second holding device receives the transverse legs.

A bearingless motor system includes a rotary shaft, a bearingless motor, first and second inverters, and a control unit. The motor includes a rotor, and a stator including a shaft support winding and a motor winding. The first inverter supplies electric power to the shaft support winding to generate a shaft support force to support the rotary shaft in a non-contact manner. The second inverter supplies electric power to the motor winding to generate a rotational torque in the rotary shaft. The control unit controls the first and second inverters. The control unit commands at least one of the first and second inverters to output a voltage or a current on which a harmonic is superimposed in order to reduce a fluctuation in the shaft support force. The harmonic is obtained by multiplication of a rotational frequency of the motor by a natural number of two or more.

A magnetic levitation device includes a magnetically effective core, a stator including coil cores with longitudinal legs and transverse legs, each coil core includes a longitudinal leg extending from a first end in an axial direction to a second end, and a transverse leg arranged at the second end of the longitudinal leg and extending in a radial direction perpendicular to the axial direction. A winding is provided at each longitudinal leg. The stator includes a cup-shaped recess into which the rotor is inserted, the cup-shaped recess arranged at an axial end of the stator, and the transverse leg of each of the plurality of transverse legs arranged around the cup-shaped recess. A containment can includes the cup-shaped recess contacting end faces of the plurality of transverse legs radially from an inside and includes a radially outer edge partially surrounding the plurality of transverse legs radially from an outside.

A stator assembly for a magnetic bearing includes a core member formed of a ferromagnetic material and including an outer annular portion and a plurality of projections extending radially inwardly from the outer annular portion and spaced circumferentially about a centerline. A plurality of bobbins are formed of an electrically insulative material and include a first shell half disposed against a first axial end of a separate one of the projections and a second shell half disposed against a second axial end of the projection. The second shell half is coupled with the first shell half such that the one projection is enclosed within a cavity defined between the two shell halves. A plurality of windings each include at least one wire wound about a bobbin and electrically coupleable with a source of electric power such that each winding and the projection encircled by the winding provide a magnetic pole.