An example stator assembly includes a stator for establishing a core side of a channel. A plurality of stator windings are secured relative to portions of the stator core. The plurality of stator windings establish a winding side of the channel. At least a portion of the channel is configured to communicate a cooling fluid from a first axial end of the stator core to an opposing axial end of the stator core.

The invention concerns a windmill including a rotatable transverse flux electrical machine (TFEM) comprising a stator portion; and a rotor portion rotatably located in respect with the stator portion, the rotor portion including an alternate sequence of magnets and concentrators radially disposed about a rotation axis thereof; the stator portion including at least one phase, the at least one phase including a plurality of cores cooperating with a coil disposed about the rotation axis, each core including a skewed pair of poles to progressively electromagnetically engage an electromagnetic field of respective cooperating concentrators. The invention is also concerned with a plurality of elements located in desired positions in the TFEM.

A tooth of a stator has a tapered shape in which a tooth width decreases toward a distal end portion thereof. A winding is formed of an edgewise winding wound around the tooth in a row. The winding is supplied with power so that a terminal on a base portion side of the tooth may have a higher voltage than that of a terminal on the distal end portion side thereof. A tooth width T.sub.h of the base portion is set within the range of T.sub.min<T.sub.h<1.25T.sub.ha defined by a tooth width T.sub.ha that maximizes an index using an outer radius and a core back width of a stator core, a clearance of the windings in the slot, a winding width, an air gap between the teeth and the winding, a pitch of the slot, and an inclination angle of the winding, and a permissible lower limit T.sub.min.

To provide a motor-driven compressor which suppresses heat generation, enables power saving, exerts excellent durability, lowers a manufacturing cost, and hardly produces a defective product. The motor-driven compressor according to the present invention comprises a cover. The cover includes a first connector portion, first and second wires, and first and second resin portions. The first and second wires include first and second terminal portions having a cylindrical shape, lead portions, and first and second lid portions that are supported at opening end portions of the first and second terminal portions. The first and second lid portions close the opening end portions of the first and second terminal portions, and thereby prevent an insulating resin from entering the first and second terminal portions.

A power transmission system for increasing the rotational speed from a rotor of a wind turbine comprises a main shaft configured to be driven by the rotor, a support structure, and a gearbox. The support structure includes at least one bearing supporting the main shaft for rotation about the main axis, with no other degrees of freedom between the main shaft and support structure. The gearbox includes a gearbox housing rigidly coupled to the support structure and a gearbox input member coupled to the main shaft. The gearbox housing supports the gearbox input member for rotation about the main axis without any other degrees of freedom, and the gearbox input member is coupled to the main shaft with translational degrees of freedom in all directions and rotational degrees of freedom about axes perpendicular to the main axis.

Cooling assemblies and methods, including, for example, at least one bar (e.g., electrically insulated and/or thermally conductive bar(s)), members (e.g., i-beams, rectangular members, and the like), stator laminations, rotor laminations, and/or combinations thereof, such as those configured to cool electric machines (e.g., electric motors and generators).

Provided is a resin sealing method of a motor core having a rotor core and a stator core formed in such a way that a plurality of iron core pieces is laminated. The resin sealing method includes pressing the rotor core and the stator core from a direction of lamination by using a set of an upper die and a lower die, then extruding a resin stored in a resin reservoir pot provided in one or both of the upper die and the lower die by using a plunger and allowing a magnet-insert hole formed in the direction of lamination of the rotor core and a connection hole formed in the direction of lamination of the stator core to be filled with the resin and harden the resin.

A motor stator locating method for locating a motor stator structure on a circuit board is disclosed. The motor stator structure includes a base and a contact pad set. The base is provided at a central portion thereof with a raised portion, which is wound around by a coil having a plurality of turns. The contact pad set is correspondingly attached to one side of the base opposite to the raised portion, and has a first and a second contact pad. The coil has two ends respectively connected to the first and the second contact pad. With these arrangements, the motor stator structure can be manufactured at largely improved production efficiency and reduced error rate.

In an armature coil according to the present invention and, more particularly, in an armature coil including a plurality of coil conductors wound around a plurality of slots which are formed in a stator core and opened on the radially inner side, the circumferential width of the plurality of the coil conductors is formed in a substantially trapezoidal shape which gets narrower toward the radially inner side and the cross-sectional areas of the plurality of the coil conductors in the slot are each substantially the same and the circumferential width thereof is formed narrower as the coil conductor is arranged toward the radially inner side; and one coil conductor is formed in a convex shape and another coil conductor is formed in a concave shape along the convex shape.

A method and apparatus for reducing or eliminating the effects of torque ripple and cogging torque and otherwise improving performance in an electromechanical machine such as a motor or generator. The rotor and/or stator is conceptually sectionalized and the sections spaced apart by amount sufficient to alleviate deleterious aspects of cogging torque and torque ripple. Positioning of the stator teeth or rotor magnets is determined based on the calculated spacing. Conceptual sections may be formed as physically individual segments. Unwound teeth may be disposed in end spaces between sections occupying less than the entire area of the end space.