US 4,512,376 AGranted

Apparatus for forming stator coils of dynamo electric machines

OwnerGiorgio Barrerainventor

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Abstract

Apparatus for forming stator coils, of undulatory type, constituted by multi-lobed turns, for dynamo electric machines comprises a first circumferential series of forming elements located at equal distances from a central axis and equiangularly spaced from each other, and a second circumferential series of forming elements equiangularly located about the central axis and intercalated between the forming elements of the first series. The forming elements of the second series are movable radially relative to the central axis between an outer position, which is spaced from the central axis by a distance greater than the distance of the forming elements of the first series from the central axis, and an inner position which is spaced from the central axis by a distance less than the distance between the forming elements of the first series and the central axis. The apparatus further includes a device for winding a copper wire about the first circumferential series of forming elements so as to form a polygonal shaped coil and cables for moving the forming elements of the second series radially from their outer positions to their inner positions, thrusting them against the sides of the said polygonal coil so as to curve these sides inwards towards the center of the coil, imparting to the latter the desired multi-lobed configuration. The forming elements of the first series are also free to move radially towards the central axis from the position in which they are located during the forming of the polygonal coil, as a result of the thrust exerted against the sides of the polygonal coil by the elements of the second series. Damping mechanisms are provided for opposing the said radial movement of the forming elements of the first series.

Apparatus for forming stator coils of the undulatory type, comprised of multi-lobed turns, for dynamo-electric machines, wherein the apparatus comprises:

a support frame having a rotatable member mounted therein,
a first circumferential series of forming elements carried by said rotatable members and located at equal distances from a central axis and equiangularly spaced from each other,
a second circumferential series of forming elements carried by said rotatable member and equiangularly located about the said central axis and intercalated between the forming elements of the first series, the forming elements of the second series being movable radially relative to the said central axis between an outer position which is spaced from the central axis by a distance greater than the distance between the central axis and the forming elements of the first series, and an inner position which is spaced from the central axis by a distance less than the distance between the central axis and the forming elements of the first series,
means for winding a copper wire about the first circumferential series of forming elements by rotation of said rotatable member so as to form a polygonal coil,
means movably carried by said support frame for moving the forming elements of the second series radially from their outer positions towards their inner positions, thrusting them against the sides of the polygonal coil so as to curve these sides towards the centre of the coil, imparting the desired undulatory multi-lobed configuration to the coil,
support means carried by said rotatable member for supporting the forming elements of the first series for free radial movement towards the central axis from the position in which they are located during the forming of the polygonal coil, under the action of the thrust exerted against the sides of the polygonal coil by the forming elements of the second series, and
means carried by said support means for opposing the said radial movement of the forming elements of the first series towards the central axis.

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Abstract

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