A blood pump system includes a pump housing and an impeller for rotating in a pump chamber within the housing. The impeller has a first side and a second side opposite the first side. The system includes a stator having drive coils for applying a torque to the impeller and at least one bearing mechanism for suspending the impeller within the pump chamber. The system includes a position control mechanism for moving the impeller in an axial direction within the pump chamber to adjust a size of a first gap and a size of a second gap, thereby controlling a washout rate at each of the first gap and the second gap. The first gap is defined by a distance between the first side and the housing and the second gap is defined by a distance between the second side and the pump housing.

A vacuum pump includes a rotor having a shaft, a base housing the shaft, a thrust disc provided at a lower portion of the shaft, and a magnetic bearing supporting the shaft. The magnetic bearing has a first electromagnet arranged to face an upper surface of the thrust disc, and a second electromagnet arranged to face a lower surface of the thrust disc. The second electromagnet includes a core. The core includes a fastening portion provided with a through-hole into which a bolt that fastens the core to the base is to be inserted. The thickness of the fastening portion in a depth direction of the through-hole is greater than the nominal diameter of the bolt, or the center position of the fastening portion in the depth direction of the through-hole is higher than the center position of the second electromagnet in an up-down direction.

A vacuum pump includes a rotor having a shaft, a base housing the shaft, a thrust disc provided at a lower portion of the shaft, and a magnetic bearing supporting the shaft. The magnetic bearing has a first electromagnet arranged to face an upper surface of the thrust disc, and a second electromagnet arranged to face a lower surface of the thrust disc. The second electromagnet includes a core. The core includes a fastening portion provided with a through-hole into which a bolt that fastens the core to the base is to be inserted. The thickness of the fastening portion in a depth direction of the through-hole is greater than the nominal diameter of the bolt, or the center position of the fastening portion in the depth direction of the through-hole is higher than the center position of the second electromagnet in an up-down direction.

A rotor, a magnetic bearing, and a drive unit that rotationally drives the rotor. The magnetic bearing includes a bearing stator and a ring-shaped bearing rotor member. The drive unit has a drive stator and a ring-shaped drive rotor member. The bearing stator has a plurality of bearing stator cores consisting of a magnetic material, disposed on an outer peripheral side of the bearing rotor member. The bearing stator core has a first portion extending in a first direction orthogonal to a direction facing the bearing rotor member, and a pair of second portions extending to a bearing rotor member side from both end portions in the first direction of the first portion. The drive stator is formed so as to pass through a position between an outer peripheral surface of the rotor and the first portion core and between the pair of second portions.

A rotor, a magnetic bearing, and a drive unit that rotationally drives the rotor. The magnetic bearing includes a bearing stator and a ring-shaped bearing rotor member. The drive unit has a drive stator and a ring-shaped drive rotor member. The bearing stator has a plurality of bearing stator cores consisting of a magnetic material, disposed on an outer peripheral side of the bearing rotor member. The bearing stator core has a first portion extending in a first direction orthogonal to a direction facing the bearing rotor member, and a pair of second portions extending to a bearing rotor member side from both end portions in the first direction of the first portion. The drive stator is formed so as to pass through a position between an outer peripheral surface of the rotor and the first portion core and between the pair of second portions.

A fan includes an annular frame, a rail assembly, a driving member and blades. The blades are connected to the driving member. The driving member is electromagnetically movable along the magnetic levitation assembly that extends along an edge of the annular frame. The driving member does not contact the annular frame or the magnetic levitation assembly so that when the fan is used, the magnetic levitation assembly is energized to generate an electromagnetic force between the magnetic levitation assembly and the driving member to move the driving member along the edge of the annular frame to drive the blades to rotate. Therefore, the blades can be rotated without having to use any motor behind the annular frame, thereby reducing the volume of the fan.

A fan includes an annular frame, a rail assembly, a driving member and blades. The blades are connected to the driving member. The driving member is electromagnetically movable along the magnetic levitation assembly that extends along an edge of the annular frame. The driving member does not contact the annular frame or the magnetic levitation assembly so that when the fan is used, the magnetic levitation assembly is energized to generate an electromagnetic force between the magnetic levitation assembly and the driving member to move the driving member along the edge of the annular frame to drive the blades to rotate. Therefore, the blades can be rotated without having to use any motor behind the annular frame, thereby reducing the volume of the fan.

The present disclosure provides a micro water pump, including: a pump body having a cavity, an inlet communicating with the cavity, and an outlet communicating with the cavity; a drive mechanism installed on the pump body for driving liquid from the inlet into the cavity and discharging from the outlet. The pump body includes a base, an upper cover engaging with the base for forming the cavity, and a barrier member. The upper cover includes a fixed wall located in the cavity. The barrier member protrudes from the fixed wall for preventing the drive mechanism from colliding and rubbing with the fixed wall during rotation. By virtue of the configuration, improved heat-dissipation performance is performed.

The present disclosure provides a micro water pump, including: a pump body having a cavity, an inlet communicating with the cavity, and an outlet communicating with the cavity; a drive mechanism installed on the pump body for driving liquid from the inlet into the cavity and discharging from the outlet. The pump body includes a base, an upper cover engaging with the base for forming the cavity, and a barrier member. The upper cover includes a fixed wall located in the cavity. The barrier member protrudes from the fixed wall for preventing the drive mechanism from colliding and rubbing with the fixed wall during rotation. By virtue of the configuration, improved heat-dissipation performance is performed.

An electric submersible pump (ESP) assembly. The ESP assembly comprises a centrifugal pump, an electric motor mechanically coupled by a drive shaft to the centrifugal pump, wherein the electric motor comprises a stator and a rotor, a bearing, wherein the bearing is disposed inside the electric motor, and a magnetic shield disposed in the electric motor between bearing and the rotor and stator.