The present invention relates to a method for laser welding conductor wires (5, 7), in particular conductor wires (5, 7) arranged in slots (2) of a core (3) of a dynamo electric machine, such as a stator core, to form a winding and a device (35) for laser GC welding conductor wires (5, 7). A first end (4) of a first conductor wire (5) and a second end (6) of a second conductor wire (7) are arranged adjacent to each other. A laser beam is applied to a first end surface (8) of the first conductor wire (5) and a second end surface (10) of the second conductor wire (7) to weld together the first end (4) of the first conductor wire (5) and the second end (6) of the en second conductor wire (7). The first end surface (8) and the second end surface (10) point upwards, preferable the first end surface (8) and the second end surface (10) are axial end surfaces. A laser beam (31) is applied in a first substantially closed path (21) within the first end surface (8) to form a first molten pool (25). The laser beam (31) is applied in a second substantially closed path (22) within the second end surface (10) to form a second molten pool (26). The laser beam (31) is applied in a third substantially closed path (23) to the first end surface (8) and to the second end surface (10) connecting the first and second molten pool.

A stator for a rotating electric machine includes a laminate stack having a plurality of slots open towards an air gap between the stator and a rotor of the electric machine. A winding includes coils which have turns that pass through the slots of the laminate stack. The turns of the coils are electrically insulated the within the slots from each other and from the laminate stack by a ceramic material.

A stator assembly includes a stator core, an insulated wire frame, a coil, and an annular insulation structure. The stator core includes a magnetic yoke portion and a radial tooth portion, and the radial tooth portion extends from the magnetic yoke portion. The insulated wire frame disposed outside the radial tooth portion of the stator core has a winding slot. The coil is wound in the winding slot of the insulated wire frame annularly. The annular insulation structure is formed by injection moulding and wraps an area where the coil is exposed out of the insulated wire frame, and the coil is packaged between the insulated wire frame and the annular insulation structure.

An electromagnetic armature comprising an electromagnetic yoke having a cylindrical surface of axis z, intended to be facing an air-gap. Said cylindrical surface is the interaction surface and comprises a plurality of teeth forming poles, associated with the interaction surface and projecting from same, and disposed at regularly spaced intervals around the whole yoke. Each tooth comprises a recess arranged on one of the faces of the tooth in a so-called polar plane. Each recess is intended to receive the winding. Said teeth are disposed on the yoke in such a way that the recesses are disposed alternately to either side of the polar plane. Alternatively, one or more teeth of the armature can be removed from the yoke.

A stator coil that includes a first coil portion including a pair of first slot-housed portions respectively arranged on an outer side of a first slot of the stator core in a radial direction and on an outer side of a second slot of the stator core in the radial direction; a second coil portion including a pair of second slot-housed portions respectively arranged on an inner side of the first slot in the radial direction and on an inner side of a third slot in the radial direction, the third slot being arranged across the first slot from the second slot in a circumferential direction; and a third coil portion including a pair of third slot-housed portions respectively arranged on an inner side and on an outer side in the radial direction.

A stator including a ring having teeth and slots between said teeth that open radially outwards and material bridges, each linking two adjacent teeth to the respective base on the side of the air-gap, a yoke attached to the ring, and windings placed in the slots of the ring, at least some of the material bridges having at least on deformable zone that can be deformed during assembly of the yoke on the ring.

The present invention provides a stator assembly for use in a motor and an assembly method therefor. The stator assembly comprises an iron core (1), comprising a cylindrical iron core body and a plurality of iron core teeth (11), conductor slots (1h) for accommodating conductors (3) being formed between every two iron core teeth (11) adjacent in the circumferential direction, side walls of each conductor slot (1h) formed by the iron core teeth (11) each comprising a flared portion (111), and the flared portions (111) being opposite each other in the circumferential direction and gradually getting further away from each other as the two extend towards radial openings of the conductor slots (1h), and sheet-like insulators (2), accommodated in the conductor slots (1h) in a manner of attaching to the peripheral walls of the conductor slots (1h), the ends of the sheet-like insulators (2) being disposed at the flared portions (111). As such, undesired interference between the conductors and the sheet-like insulators does not occur during the insertion of the conductors into the conductor slots. The present invention also provides a motor comprising the stator assembly for use in a motor, which can produce the same beneficial effect.

An axial flux induction machine including at least two stator and one rotor where the stators include an inner and outer ring of coils. The stator includes at least two mirrored structure constructed such as to secure wire coils, amplify magnetic characteristics, and provide a structure upon which to secure a rotary shaft or through which a rotary shaft may be run. The structures supporting either the outer or inner ring of coils can be in contact between the two stators and the outer ring can be spaced further from the rotary shaft than the inner ring of coils and also further from the rotary shaft than an outer edge of the rotor.

A torque motor for a servovalve is provided, the torque motor comprising an armature and a first pole piece. The first pole piece has a first portion and a second portion that is selectively moveable relative to the first portion such that a size of an air gap formed between the second portion and the armature is adjusted in response to the movement of the second portion relative to the first portion.

A method for manufacturing a wound rotor or stator having more than four poles, preferably a rotor, the rotor or stator having teeth provided with pole shoes. The method includes the following steps, for each pole: (a) producing a partial winding by winding at least one conductor over the portion of the tooth of this pole extending axially along this pole between the pole shoes of this pole and a plane (P.sub.min) at right angles to the axis of the pole and tangential to a pole shoe of an adjacent pole, (b) pushing back the duly produced partial winding towards the base of the tooth, and freeing said portion of the tooth having been used for the winding, and (c) repeating step (a) to produce another partial winding on the duly released portion of tooth.