A two degree-of-freedom brushless DC motor includes a stator, a rotor, a plurality of distributed stator windings, and a stator voice coil winding. The stator includes an inner stator structure and a plurality of arc-shaped stator poles. The inner stator structure includes a main body and a plurality of spokes that are spaced apart from each other to define a plurality of stator slots. Each arc-shaped stator pole is connected to a different one of the spokes. The rotor is spaced apart from the stator, includes a plurality of magnets, and is configured to rotate about a plurality of perpendicular axes. The distributed stator windings are wound around the plurality of spokes and extend through the stator slots. The stator voice coil winding is wound around the outer surfaces of the arc-shaped stator poles. The arc-shape and spacing of the stator poles define the stator as being spherically shaped.

A fluid circulator including a pump body with an impeller; an electric motor having a rotor connected to the impeller for rotatably driving the impeller; an end portion associated with the motor body for housing at least one electronic board for controlling the circulator. The end portion is monolithically cup-shaped lid fitted onto the motor body in substantial continuity therewith enclosing a housing compartment for said electronic board; an electronic power device mounted onto the electronic board so as to face the end wall of the cup-shaped lid; at least one portion of said end wall being recessed towards the electronic board and being externally provided with at least one cooling fin extending in parallel to the axis of the motor to constitute a heat sink; and a layer of a heat-conductive paste material in contact with the electronic power devices and recessed surface.

A fluid circulator including a pump body with an impeller; an electric motor having a rotor connected to the impeller for rotatably driving the impeller; an end portion associated with the motor body for housing at least one electronic board for controlling the circulator. The end portion is monolithically cup-shaped lid fitted onto the motor body in substantial continuity therewith enclosing a housing compartment for said electronic board; an electronic power device mounted onto the electronic board so as to face the end wall of the cup-shaped lid; at least one portion of said end wall being recessed towards the electronic board and being externally provided with at least one cooling fin extending in parallel to the axis of the motor to constitute a heat sink; and a layer of a heat-conductive paste material in contact with the electronic power devices and recessed surface.

The invention relates to a rotor unit for a brushless electric motor with an annular rotor core surrounding a central axis, a plurality of magnet arrangements that are arranged around the rotor core in a circumferential direction of the rotor and that each have a convex outer peripheral face, an inner contact face, two axial end faces and two side faces pointing in the circumferential direction, a magnet holder having a number of holding portions which are each arranged between two adjacent magnet arrangements and are moulded onto a ring portion of the magnet holder, wherein the holding portions are configured T-shaped in a cross section along a plane running transversely to the central axis and each have a shank portion and a head portion, wherein the shank portion lies on the side faces of the magnet arrangements in a contact region and the head portion lies on the peripheral faces of the magnet arrangements, wherein the head portion lies on the peripheral faces in a contact area, which contact area is separated by a distance from a transition between the shank portion and the head portion.

A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core including an inner body mounted on the rotor shaft and radial projections projecting outwardly from the inner body, a permanent magnet mounted on an outer end of the radial projections, and a mold structure formed in contact with the radial projections and configured to secure the permanent magnet to the rotor core.

A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core including an inner body mounted on the rotor shaft and radial projections projecting outwardly from the inner body, a permanent magnet mounted on an outer end of the radial projections, and a mold structure formed in contact with the radial projections and configured to secure the permanent magnet to the rotor core.

A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core having a cylindrical body, a permanent magnet ring mounted on an outer surface of the cylindrical body with no intermediate adhesive therebetween, and metal sleeve securely fitted outside the permanent magnet ring. The metal sleeve includes a flange extending radially inwardly that covers an axial end of the permanent magnet ring and is bonded to the rotor core to secure the permanent magnet ring to the rotor core.

A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core having a cylindrical body, a permanent magnet ring mounted on an outer surface of the cylindrical body with no intermediate adhesive therebetween, and metal sleeve securely fitted outside the permanent magnet ring. The metal sleeve includes a flange extending radially inwardly that covers an axial end of the permanent magnet ring and is bonded to the rotor core to secure the permanent magnet ring to the rotor core.

A brushless motor is provided that includes a rotor, a stator, a bearing member, an attraction magnet, and a yoke. The rotor includes a shaft, a rotor yoke that holds the shaft and covers a peripheral surface of the shaft, and a magnet disposed around an outer periphery of the rotor yoke. The stator is disposed around an outer periphery of the rotor. An inner wall of a housing serving as a bearing member rotatably holds the shaft with a bearing. The attraction magnet is disposed at an end portion of the inner wall at which the rotor yoke holds the shaft, and produces an attraction force to attract the rotor yoke. The yoke supplements and enhances the attraction force produced by the attraction magnet.

A brushless motor is provided that includes a rotor, a stator, a bearing member, an attraction magnet, and a yoke. The rotor includes a shaft, a rotor yoke that holds the shaft and covers a peripheral surface of the shaft, and a magnet disposed around an outer periphery of the rotor yoke. The stator is disposed around an outer periphery of the rotor. An inner wall of a housing serving as a bearing member rotatably holds the shaft with a bearing. The attraction magnet is disposed at an end portion of the inner wall at which the rotor yoke holds the shaft, and produces an attraction force to attract the rotor yoke. The yoke supplements and enhances the attraction force produced by the attraction magnet.