FR2697386A1 - A method of manufacturing an excitation system for the series motors and series motors thus produced. - Google Patents

Abstract

a) Manufacturing process of an excitation system for series motors. b) A method characterized in that a ring (12) is wound with a wire insulated with varnish, the latter is shifted laterally in its lower zone and a lower zone and a lower zone are deformed in the opposite direction, in the form of meanders. upper zone of the ring (12) using a device having punches (28, 32) working in opposite directions as well as counter-supports (22), to obtain a group of windings whose loops of superimposed meanders, have in their interior zone, the passages which correspond to the dimensions of the polar cores which will thus be surrounded subsequently. c) Application to the manufacture of series motors.

Description

i "Method of manufacturing an excitation system for series motors

and series engines thus produced "

  The invention relates to a method for producing

  of a series excitation motor excitation system with an excitation winding in the winding direction alternating around the polar nuclei of the

pole support.

  The invention also relates to engines

series thus realized.

  Field excitation field motors electrically excited series or more simply the

  series engines have to pass, according to the branch-

  the total intensity or half or a fraction of the intensity corresponding to the motor current divided by the number of poles or pairs of poles.

  known that the windings of the excision field system

  tation are mounted on the solid polar nuclei

  of the stator or stamped in it, the meaning of the

  alternate rotation from pole to pole.

  It has already been proposed, according to

  0 371 933, to manufacture the excitation windings from a conically wound electrical conductor and which then gives a relative slip excitation coil, which coil can be placed

  around two neighboring poles However, the inconvenience

  deny that to arrive at a set of coils for several poles, it is necessary to bring together the different

  coils by welding the beginning and the end of the coils

  Elements e. The principle of conical winding and its coating with an electrical insulator is moreover

  very difficult to implement.

  DE-OS 27 24 009 discloses a method of manufacturing a stator of a dynamo-electric machine, having a field winding of

  sinusoidal form, which can be placed in a cul-

  However, such systems do not

  only a limited magnetic flux for the poles because

  the field winding does not completely surround them

is lying.

  The object of the present invention is to create a method corresponding to the type defined above, which makes it possible to produce an electrical excitation system for series motors with insulating varnish wire, without the conductors used presenting

breaking or welding lines.

  For this purpose the invention relates to a method corresponding to the type defined above, characterized in that a ring is wound with an insulated wire by varnish, the latter is shifted laterally in its lower zone and deformed in opposite directions , in meanders, a lower zone and an upper zone of the ring

  using a device with work punches

  lant in opposite directions as well as against-supports, to obtain a group of windings whose loops of

  superimposed meanders, have in their area

  the passages corresponding to the dimensions

  polar nuclei which will be surrounded by

  quently. Thus, it has been found that if a ring is wound with round wire, isolated by varnish, inexpensive, so that the periphery of the ring is sufficient after appropriate shaping, to surround the desired number of poles , one could manufacture in one piece this system of electric excitation, without

no welding point.

  The excitation systems thus obtained are

  use on incoming or outgoing pole machines.

  According to another characteristic of the in-

  vention, the lateral shift is made according to the

wire diameter.

  According to another characteristic of the in-

  the number of poles that a group of

  the bearing is freely chosen and can be

  by a predetermined dimension of the polar nuclei

  res depending on the periphery of the ring.

  The invention also relates to electric machines equipped with windings made according to the invention. The present invention will be described hereinafter with the aid of an exemplary embodiment shown in the accompanying drawings, in which: FIGS. 1 to 8 show the manufacturing phases of a three-pole excitation system.

  for a six-pole series motor, according to the invention.

  Figure 9 schematically shows a

  winding stage for six poles with a series circuit. According to Figure 1, a ring 12 is made with wire 10 of circular section, isolated with a varnish.

  The periphery of the ring 12 is dimension-

  born to have enough "length" to

  later on the poles Ring 12 has a

  input terminal 14 and an output terminal 16.

  In the next stage, as illustrated by

  2, an offset is imparted in the ring 12 so that the lower zone 18 of the ring 12 is offset laterally, that is to say in the axial direction by a distance corresponding to the diameter of the wire.

of circular section.

  Figures 3 and 4 show the formatting

  of the ring 12 to produce a coil of excitement

for three poles.

  For this purpose, and with the help of a device

  property, we realize in the ring 12, each time the-

  on the inner periphery 20, two

  support 22 Counter-supports 22 have dimensions

  corresponding to the polar nuclei 24, 26.

  With the aid of a punch 28, the zone is deformed

  12 of the ring so that the punch 28

  the outer periphery 30 of the ring 12 from the top and pushes the ring 12 between the counter-supports 22, acting in the radial direction. The punch 28 has a width such that the inner periphery 20

  ring 12 comes to bear against the surfaces la-

  of the counter-supports 22 and that after withdrawal

  punch 28, there remains an intermediate volume cor-

  corresponding to the dimensions of the polar ring 30 By two punches 31 which laterally attack the ring 12, the ring 12 is compressed at the same time against the

outer face of the counter-supports.

  Then a second punch 32 pushes

  below the outer periphery 30 of the ring 12 to push from below, the lower zone of the ring 12 between the counter-supports 22 As the ring 12 has already been shifted laterally, the lower zone 12 can be pushed in front of the upper zone previously deformed The shaping of meanders in the opposite direction is done in a manner forming in the ring 12, three passages 34, of the same size, constituted by the meander loops superimposed

the ring 12.

  After having placed the input and output terminals 14, 16 in their final position, the shaped ring 12 is extracted from the device and is bent according to the inside diameter of the stator for

  form a half-game (Figures 5 and 6).

  As illustrated in FIGS. 7 and 8, two such half-games are mounted each time, each time with three passages 34 on a tool-holder corresponding to the inside diameter of the excitation winding, and

  it equips the polar nuclei 24, 26, 30.

  The input and output terminals 14, 16 are

  together to obtain a system of excitation of a

  six-pole generator consisting of winding groups connected in parallel The whole structure can then be placed in the motor stator housing

  and the polar nuclei 24, 26, 30 can be

  on the inner periphery.

  FIG. 9 shows how to manufacture, according to the method described, compound excitation systems

  several winding portions 40 connected in se-

for all six poles.

  It suffices to remark that the periphery of the ring 12 is dimensioned so that, by shaping performed repeatedly with the punches 28 and 32 on the different winding parts 40,

  has a ring 12 of sufficient dimensions.

  The manufacturing steps can be performed with an appropriate number of counter-supports 22 and punches 28 or 32, as in the method described above.

  The invention is not limited to a realization

  It is also possible in the context of the invention for several groups of windings according to FIG. 6 to cover the neighboring groups. winding parts so that all the polar nuclei 24,

  26, 30 have a magnetic flux of the same intensity.

Claims (1)

1) Method of manufacturing, an excitation system for series motors, with an excitation winding in the direction of the alternating winding around the polar cores of the pole support, characterized in that a ring (12) is wound with an insulated wire by varnish (10), the latter is shifted laterally in its lower zone and a lower zone and an upper zone are deformed in the opposite direction in meanders. the ring (12) using a device having opposite-working punches (28, 32) and counter-supports (22) to obtain a group of windings including meander loops. (40) have, in their inner zone, the passages (34) corresponding to the dimensions of the polar nuclei which will thus be subsequently covered. Method according to claim 1, characterized in that the lateral offset is in function of the diameter of the wire (10). Method according to one of the preceding claims, characterized in that the number of poles permitted by a winding group is freely selected and can be predetermined by a predefined size of the polar nuclei as a function of the periphery. of the ring (12). ) Series electric motor characterized in that it comprises an excitation system carried out according to the method of any one of the claims 1 to 3.