Equipment For Producing Coils of a Stator of an Electrical Machine and Method For Making Coils

Abstract

The invention relates to equipment for producing coils of a stator of an electrical machine and a method for producing coils. The coil is formed by connecting arms ( 6 ) of conducting pins ( 4 ) inserted into the slots ( 3 ) of a magnetic circuit ( 2 ) of the stator ( 1 ). The equipment comprises a shaper ( 10 ) axisymmetric about an axis ( 5 ), and the shaper ( 10 ) is designed to be placed inside the free ends of the arms ( 6 ) and in contact with the magnetic circuit ( 2 ). A series of guide-pins ( 12 ) equal in number to the slots ( 3 ) is designed so that each penetrates into a hole of the shaper ( 10 ). Each hole is drilled along an axis. The axes of the holes ( 13 ) meet at a first point ( 14 ) on the axis of revolution ( 5 ) of the shaper ( 10 ). Each guide-pin ( 12 ) is designed to separate two arms ( 6 ) of pins ( 4 ) inserted into two adjacent slots ( 3 ) to guide the arms ( 6 ) in a fixed direction, distinct from the direction of the arms ( 6 ) in their slot ( 3 ). The method using the previously described equipment includes successively carrying out the following operations. The pins ( 4 ) are inserted according to a wiring scheme for the coil; The first shaper ( 10 ) is put into place along the axis of revolution ( 5 ) of the magnetic circuit ( 2 ) on the free side of the arms ( 6 ) in contact with the magnetic circuit ( 2 ); The first series of guide-pins ( 12 ) are put into place. Each of the arms ( 6 ) is folded by pressing it onto a guide-pin ( 12 ) of the first series.

1 . Equipment for producing coils of a stator of an electrical machine, the coil having several windings, each winding being formed by connecting arms of conducting pins inserted into the slots of a magnetic circuit of the stator, comprising:
 a shaper axisymmetric about an axis, the shaper being designed to be placed inside free ends of the arms and in contact with the magnetic circuit, a first series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the shaper, each hole being drilled along an axis, the axes of the holes meeting at a first point on an axis of revolution of the shaper, each guide-pin being designed to separate two arms of pins inserted into two adjacent slots to guide the arms in a fixed direction, distinct from the direction of the arms in their slot.   
   
   
       2 . The equipment as claimed in  claim 1 , wherein the first point is situated a fixed distance from a bearing surface of the shaper on the magnetic circuit and wherein the fixed distance is nonzero. 
   
   
       3 . The equipment as claimed in  claim 1 , wherein it comprises a second series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the shaper, each hole being drilled along an axis, the axes of the holes meeting at a second point on the axis of revolution of the shaper, the second point being at a distance from the first point, each guide-pin of the second series being designed to guide the arms in a direction parallel to the direction of the arms in their slot. 
   
   
       4 . The equipment as claimed  claim 1 , the shaper comprising a conical part designed to move the arms of the pins away from an axis of the magnetic circuit. 
   
   
       5 . The equipment as claimed in  claim 1 , comprising a second shaper axisymmetric about an axis, the second shaper being designed to be placed inside the bends in the pins and in contact with the magnetic circuit, a third series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the second shaper, each hole being drilled along an axis, the axes of the holes meeting at a point on the axis of revolution of the second shaper, each guide-pin of the third series being designed to separate two arms of pins threaded into two adjacent slots so as to position the bends in the pin at a fixed distance from the magnetic circuit. 
   
   
       6 . A method for producing coils of a stator of an electrical machine, the coil comprising several windings, each winding being formed by connecting arms of conducting pins inserted into the slots of a magnetic circuit of the stator, the method using the equipment as claimed in  claim 1 , comprising successively carrying out the following operations:
 inserting the pins into the slots according to a wiring scheme for the coil;   putting the first shaper into place along the axis of revolution of the magnetic circuit on the free side of the arms in contact with the magnetic circuit   putting the first series of guide-pins into place;   folding each of the arms by pressing it onto a guide-pin of the first series.   
   
   
       7 . The method as claimed in  claim 6 , using equipment for producing coils of a stator of an electrical machine, the coil having several windings, each winding being formed by connecting arms of conducting pins inserted into slots of a magnetic circuit of the stator, the equipment comprising:
 a shaper axisymmetric about an axis, the shaper being designed to be placed inside free ends of the arms and in contact with the magnetic circuit, a first series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the shaper, each hole being drilled along an axis, the axes of the holes meeting at first point on an axis of revolution of the shaper, each guide-pin being designed to separate two arms of pins inserted into two adjacent slots to guide the arms in a fixed direction, distinct from the direction of the arms in their slots, wherein the equipment comprises a second series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the shaper, each hole being drilled along an axis, the axes of the holes meeting at a second point on the axis of revolution of the shaper, the second point being at a distance from the first point, each guide-pin of the second series being designed to guide the arms in a direction parallel to the direction of the arms in their slot, wherein, after having folded each of the arms by pressing it onto a guide-pin of the first series, in successively carrying out the following operations:
 putting the second series of guide-pins into place; 
   folding the arms by pressing onto a guide-pin of the second series so as to guide them in a direction parallel to the direction of the arms in their slots; and   connect the arms in accordance with a wiring scheme for the coil.   
   
   
       8 . The method as claimed in  claim 6 , using a second shaper axisymmetric about an axis, the second shaper being designed to be placed inside the bends in the pins and in contact with the magnetic circuit, a third series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the second shapers each hole being drilled along an axis, the axes of the holes meeting at a point on the axis of revolution of the second shaper, each guide-pin of the third series being designed to separate two arms of pins threaded into two adjacent slots so as to position the bends in the pin at a fixed distance from the magnetic circuit, wherein, before inserting the pins into the slots, the second shaper is put in place pressing against the magnetic circuit and the third series of guide-pins is placed in the holes. 
   
   
       9 . The method as claimed in  claim 7 , using a second shaper axisymmetric about an axis, the second shaper being designed to be placed inside the bends in the pins and in contact with the magnetic circuit, a third series of guide-pins equal in number to the slots and designed so that each penetrates into a hole of the second shaper, each hole being drilled along an axis, the axes of the holes meeting at a point on the axis of revolution of the second shaper, each guide-pin of the third series being designed to separate two arms of pins threaded into two adjacent slots so as to position the bends in the pin at a fixed distance from the magnetic circuit wherein, before inserting the pins into the slots, the second shaper is put in place pressing against the magnetic circuit and the third series of guide-pins is placed in the holes.