An electric motor includes: a rotor to rotate about an axis-of-rotation line; a stator placed outside the rotor in a radial direction of the rotor, and having multiple metal plates which are piled up in a direction of the axis-of-rotation line and which include a first metal plate and a second metal plate; and a conductive part pair including a first conductive part placed on an outer surface of the stator, having conductivity, and connecting the first and second metal plates, and a second conductive part placed at a position different from that of the first conductive part on the outer surface of the stator, having conductivity, and connecting the first and second metal plates.

An electric motor includes: a rotor to rotate about an axis-of-rotation line; a stator placed outside the rotor in a radial direction of the rotor, and having multiple metal plates which are piled up in a direction of the axis-of-rotation line and which include a first metal plate and a second metal plate; and a conductive part pair including a first conductive part placed on an outer surface of the stator, having conductivity, and connecting the first and second metal plates, and a second conductive part placed at a position different from that of the first conductive part on the outer surface of the stator, having conductivity, and connecting the first and second metal plates.

Device for manufacturing a lamination stack (E) for a rotating electrical machine, each lamination having a plurality of lamination sectors with notches. The laminations providing a central bore. The device including a mandrel for receiving the stacked lamination sectors, in which the mandrel includes a mandrel body provided with longitudinal slots, bars received in the longitudinal slots of the mandrel body, the bars being magnetizable, a magnetization system for the bars, and alignment pins intended to be received in the notches of the laminations to align the notches.

Device for manufacturing a lamination stack (E) for a rotating electrical machine, each lamination having a plurality of lamination sectors with notches. The laminations providing a central bore. The device including a mandrel for receiving the stacked lamination sectors, in which the mandrel includes a mandrel body provided with longitudinal slots, bars received in the longitudinal slots of the mandrel body, the bars being magnetizable, a magnetization system for the bars, and alignment pins intended to be received in the notches of the laminations to align the notches.

A method for the making of a stator for electric motors, comprising: providing two jigs, each having a circular opening inside the jig and a series of teeth inside the circular opening extending towards a central axis, the teeth defining a series of slots; arranging the two jigs coaxially spaced along a central axis; winding, between the teeth, a plurality of wires to form a plurality of windings, so the wires of each winding occupy a plurality of the slots of both jigs, the windings including linear wire portions extending between the two jigs; inserting, from the inside, a plurality of first stator portions between the linear wire portions; and inserting, from the outside, a plurality of second stator portions complementary to the first stator portions between the linear wire portions, to form a stator body.

A split-type laminated iron core is composed by laminating a plurality of metal plate materials having an annular shape. The metal plate material includes a first split piece and a second split piece arranged in a circumferential direction and divided by a predetermined cutting line. A shear surface formed on a first end surface of the first split piece and a shear surface formed on a second end surface of the second split piece abut on each other, and the first split piece and the second split piece are temporarily connected via the cutting line defined by a boundary between the first end surface and the second end surface so that the first end surface and the second end surface do not completely overlap.

A split-type laminated iron core is composed by laminating a plurality of metal plate materials having an annular shape. The metal plate material includes a first split piece and a second split piece arranged in a circumferential direction and divided by a predetermined cutting line. A shear surface formed on a first end surface of the first split piece and a shear surface formed on a second end surface of the second split piece abut on each other, and the first split piece and the second split piece are temporarily connected via the cutting line defined by a boundary between the first end surface and the second end surface so that the first end surface and the second end surface do not completely overlap.

A compound winding motor stator includes a stator core and a coil winding structure. The stator core has a yoke, and a plurality of winding portions formed toward the center of the yoke in an equally distanced manner. The winding portions are defined as a plurality of first winding portions and a plurality of second winding portions. The first winding portions and the second winding portions are arranged in a staggered manner. The coil winding structure has first windings configured as rectangular windings and disposed on the first winding portions, and second windings configured as trapezoid windings and disposed on the second winding portions. Accordingly, the rectangular windings and the trapezoid windings are arranged in a staggered manner, that improves the slot fill factor of the motor stator, thereby increasing the efficiency of the motor.

A compound winding motor stator includes a stator core and a coil winding structure. The stator core has a yoke, and a plurality of winding portions formed toward the center of the yoke in an equally distanced manner. The winding portions are defined as a plurality of first winding portions and a plurality of second winding portions. The first winding portions and the second winding portions are arranged in a staggered manner. The coil winding structure has first windings configured as rectangular windings and disposed on the first winding portions, and second windings configured as trapezoid windings and disposed on the second winding portions. Accordingly, the rectangular windings and the trapezoid windings are arranged in a staggered manner, that improves the slot fill factor of the motor stator, thereby increasing the efficiency of the motor.

A method of manufacturing a centrifugal wheel for a mixing or pumping device with a magnetically levitated centrifugal wheel, includes providing an impeller configured to be magnetically levitated, has and having a permanent magnetic core, permanent magnetic core completely enclosed by a sheathing, the sheathing including plastic, and a plurality of blades to mix or convey substances provided on the sheathing, removing all blades from the sheathing, separating the permanent magnetic core from the sheathing, the permanent magnetic core being demagnetized before the permanent magnetic core is separated from the sheathing, attaching an encapsulation including plastic, and which completely encloses the permanent magnetic core, and attaching a plurality of vanes to the encapsulation.