A device for preventing bearing damage from currents through a three-phase motor is provided, including a shield for winding and copper wire within each stator slot of a motor. The shield includes an electrically conductive layer which is insulated from the winding and from the laminated stator core of the three-phase motor. The conductive layer is grounded or conductively connected to the laminated stator core of the three-phase motor on only that side on which the three-phase current is fed to the winding of the motor.

An electric machine includes a stator with a plurality of circumferentially-spaced stator segment assemblies. A rotor rotates relative to the stator and defines an airgap between an outer diameter of the rotor and the inner diameter of the stator. Each stator segment assembly includes a stator segment core, an endcap that is attached to the stator segment core, and winding wire that is wound around the endcap and the stator segment core. The endcap provides first and second axial mating surfaces. The endcaps provide first and second circumferential surfaces on opposite axial ends thereof. First and second annular seals engage the first and second circumferential surfaces to provide circumferential seals at opposite axial ends of the stator. The annular seals, the axial seals and the circumferential seals prevent the entry of debris into the airgap.

An alternator includes a rotor for forming north-seeking (N) and south-seeking (S) poles about a rotational circumference, a stator including a stator core disposed facing the rotor, and a stator winding installed in the stator core, a bracket supporting the rotor and the stator, and a cooling means for cooling the stator winding by moving together with the rotor and generating a flow of cooling air inside the bracket, wherein the stator core includes a laminated core formed with a number of slots extending axially at a predetermined pitch in a circumferential direction, the stator winding includes a number of winding sub-portions in each of which a long strand of wire is wound so as to alternately occupy an inner layer and an outer layer in a slot depth direction within the slots at intervals of a predetermined number of slots, the strand of wire folding back outside the slots at first and second axial end surfaces of the stator core to form turn portions, the turn portions align in a circumferential direction to constitute coil ends, an electrically-insulative resin portion is disposed so as to completely cover the coil ends, and at least one surface of the electrically-insulative resin portion selected from a rotor-facing surface and a bracket-facing surface is formed into a smooth surface.

An iron core of a rotating-electric machine and a manufacturing method for the same permit a uniform curvature to be easily obtained over an entire circumference of the iron core. The iron core has laminated magnetic plate strips, a cylindrical core proximal portion, a plurality of teeth projecting in a substantially radial direction from the core proximal portion, and slots for accommodating a winding that are located between the teeth adjacent to each other. The iron core is fabricated by curving both end portions of a substantially hexahedral laminate so that the core proximal portion obtains a predetermined curvature, forming the entire laminate into a cylindrical shape by wrapping it around a cylindrical core member so that distal ends of the teeth project from the core proximal portion, and joining both end portions of the laminate.

An electromechanical machine includes a stator fixed with respect to a housing structure and a rotor fixed with respect to a driven shaft. The stator includes a magnetically permeable core having a plurality of parallel winding slots containing conductive windings. Coilheads are located at opposite axial ends of the magnetically permeable core where the windings turn to extend down a parallel winding slot. The motor is equipped with an electrostatic shield arrangement to reduce capacitive coupling between the stator and rotor during operation. The shield arrangement comprises a grounded conductive layer separated from the conductive windings of the stator by an insulative layer of cured resin material. Preferably, the conductive layer may be formed of a conductive paint.