Method and apparatus for wire termination on outwardly spooled multi-pole stators

Abstract

A method and device for wire termination on stators ( 1 ) wherein the wire ( 15 ) is wound about poles ( 6 ) distributed by a flier ( 10 ), guided by shrouds ( 16 ) that move radially with respect to the stator ( 1 ) overlapping the respective pole ( 6 ). Wire termination operations are provided on the wire ends ( 15 ) into the terminals ( 4 ) with the aid of the flier ( 10 ), carried out by an apparatus equipped with a termination device ( 20 ), comprising a first deflector ( 21 ), a second deflector ( 22 ), a blade ( 23 ), and a clamp formed by a movable gripper ( 24 ) and a fixed gripper ( 25 ). The movable gripper is suitable for closing onto the fixed gripper for gripping the wire ( 15 ). The device ( 20 ) can carry out the steps of catching, moving, introducing and cutting the wire ( 15 ) with movements parallel to its own axis ( 27 ), or to the axis ( 7 ) of the stator ( 1 ).

What we claim is:  
     
         1 . A method for lead wire termination on outwardly spooled multi-pole stators, 
 wherein the multi-pole stators are formed by a core of ferromagnetic sheets, having an axis and a plurality of poles that radially extend defining grooves between them, and by a terminal board that covers in part the core and has a plurality of terminals,    wherein the lead wire is wound about said plurality of poles distributed by a flier and guided by shrouds that move radially with respect to the multi-pole stators, overlapping the respective polar extension,    and wherein, before and/or after winding, wire termination operations are provided for the wire ends in said terminals with the aid of a rotatable arm, said termination operations comprising the steps of catching, moving, introducing in the terminals and cutting a portion of wire,    characterised in that said steps of catching, moving, introducing and cutting said portion of wire occurs by means of a single multifunctional instrument having an axis parallel to the axis of the stator, capable of carrying out a plurality of movements parallel to and/or rotations about said axis.    
     
     
         2 . The method according to  claim 1 , wherein, the axis of the multifunctional instrument is incident to the stator.  
     
     
         3 . The method according to  claim 1 , wherein said step of introducing said wire comprises, before starting a winding step, a step of creating a bridge of wire between a clamp and a taker-in element, and a step of introducing the wire bridge in the terminal by translating said bridge parallel to said axis.  
     
     
         4 . The method according to  claim 1 , wherein said step of creating the bridge can be carried out by rotating the clamp and the taker-in element about said axis.  
     
     
         5 . The method according to  claim 1 , wherein said step of cutting the wire is carried out by bringing a blade parallel to said axis up to intersecting said wire, kept by a clamp.  
     
     
         6 . The method according to  claim 1 , wherein said step of cutting the wire is associated to a movement of folding the portion of cut wire protruding from a terminal to bend along a terminal side before the start of winding.  
     
     
         7 . The method according to  claim 1 , wherein said portion of cut wire bent along the terminal side is kept pressed against the terminal at least during the first winding phases.  
     
     
         8 . The method according to  claim 7 , wherein when the terminal is arranged peripherally on the polar extension, the portion of cut wire is kept pressed elastically by an element associated to the shroud that extends from the shroud in a direction orthogonal to said axis.  
     
     
         9 . The method according to  claim 1 , wherein said step of catching the wire, when after winding a portion of wire is stretched between said flier and a spooled coil, is carried out by translating a clamp parallel to said axis up to a predetermined position, opening said clamp, rotating the flier until said stretched wire portion does not intersect said predetermined position, closing said clamp.  
     
     
         10 . The method according to  claim 1 , wherein a step is provided of bringing said portion of wire to said predetermined position by a protruding element that rotates coaxially to said clamp and intersects said portion of wire.  
     
     
         11 . A method for wire termination on outwardly spooled multi-pole stators, 
 wherein the stators have a core from which a plurality of pole walls radially extend with poles defining grooves between them, said pole extensions having longitudinal edges, which define the slits for entering the grooves, and circumferential edges that define the height of the stator, said poles having terminals,    wherein a wire is wound about said pole walls by means of a rotatable arm guided by shrouds that overlap the circumferential edges of the pole and that move along an axis that is radial with respect to the stator for laying the wire along the pole walls,    and wherein said rotatable arm carries out operations of wire termination on the wire ends in said terminals before and/or after winding,    whose characteristic is that a step is provided of blocking said wire ends near to or at said terminals, said step of blocking being carried out in a direction parallel to said radial axis.    
     
     
         12 . A device for wire termination on outwardly spooled multi-pole stators, 
 wherein the stators are formed by a core of ferromagnetic sheets, having an axis and a plurality of poles that radially extend defining grooves between them, and by a terminal board that covers in part the core and has a plurality of terminals,    associated to a stator winding machine comprising at least a flier and a shroud that moves radially with respect to the stator overlapping the respective polar extension,    means for terminating wire ends in said terminals with the aid of said flier, said means for terminating comprising means for catching, moving, introducing in the terminals and cutting a portion of wire,    characterised in that said means for catching, moving, introducing and cutting said portion of wire are integrated in a single multifunctional instrument having an axis parallel to the axis of the stator, capable of carrying out a plurality of movements parallel to and/or rotations about said axis.    
     
     
         13 . The device according to  claim 12 , wherein said means for introducing said wire comprises means for creating a bridge of wire between a clamp and a taker-in element, and means for introducing into a terminal said bridge by translating said bridge parallel to said axis.  
     
     
         14 . The device according to  claim 12 , wherein said means for creating the bridge comprises means for rotating said clamp and said taker-in element about said axis.  
     
     
         15 . The device according to  claim 12 , wherein said means for cutting the wire comprises a blade sliding parallel to said axis up to intersecting said wire, kept by said clamp.  
     
     
         16 . The device according to  claim 12 , wherein said means for cutting the wire are associated to a deflector movable parallel to said axis and suitable for folding the portion of cut wire protruding from a terminal to bend along the terminal side before the start of winding.  
     
     
         17 . The device according to  claim 16 , wherein, when the terminal is arranged peripherally on the pole, means are provided for pushing said portion of cut wire bent along the terminal side at least during the first winding phases.  
     
     
         18 . The device according to  claim 17 , wherein said pushing means comprises an element associated to the shroud that extends from the shroud in a direction orthogonal to said axis, said pushing element being biased by a spring.  
     
     
         19 . The device according to  claim 12 , wherein said means for catching the wire comprises a clamp movable parallel to said axis up to a predetermined position, said clamp being formed by a first and a second gripper suitable for closing on each other with movement parallel to said axis.  
     
     
         20 . The device according to  claim 19 , wherein a second deflector is provided for bringing a portion of wire stretched between said flier and said stator to said predetermined position, said second deflector comprising a protruding element that rotates coaxially to said clamp and intersects said portion of wire.  
     
     
         21 . A device for wire termination on outwardly spooled multi-pole stators, 
 associated to a stator winding machine, which comprises a rotatable arm suitable for winding a wire about said pole walls and shrouds that approach the circumferential edges of the polar extension, overtaking them and moving along an axis that is radial with respect to said stator for laying the wire along the pole walls,    characterised in that block means are provided for said wire ends near to or at said terminals, said block means moving in a direction parallel to said radial axis and having an end suitable for pushing said wire end against said stator near to or at said terminal.    
     
     
         22 . A device according to  claim 21 , wherein said shroud comprises a first portion that approaches form outside the pole, allowing a second portion to overtake the circumferential edges of the pole and to move along said radial axis, said block means being mounted on said first portion.  
     
     
         23 . A device according to  claim 22 , wherein said block means comprises a pin parallel to said axis that is radial and slidingly engaged in said first portion, a resilient element being provided that biases the sliding of said pin in said first portion.