JP4968032B2 - Coil / wedge insertion device - Google Patents

Description

  This invention relates to a coil wound at high density in a slot, which is performed as one of the winding processes, in response to the demand for higher density of coil winding around the teeth constituting the magnetic poles of the motor stator core. The present invention relates to a coil / wedge insertion device for improving deterioration of insertability of a wedge inserted into the same slot together with a coil when inserting a coil.

  The electric motor is composed of a stator having a magnetic pole and a mover. Among them, the stator is a space called a slot formed between an iron core composed of a plurality of tooth portions (teeth) that are projections formed on the yoke portion and the inner periphery thereof, and adjacent tooth portions. And a coil wound around each tooth part, and each tooth part forms a magnetic pole by energizing each coil.

  The method of winding a coil around this tooth part is usually by using a device called a coil / wedge insertion device, a coil previously wound in a slot of an iron core constituting a stator, and this coil for each slot insertion unit. It is based on a method of inserting a wedge that insulates from the bundle.

  One way to improve the efficiency of an electric motor is to increase motor efficiency by increasing coil density and reducing motor loss. However, by increasing the coil density, the insertion resistance of the wedge (insulating paper) inserted into the slot for insulation between the coil and the surroundings at the same time as the coil increases, and the insertability of the wedge into the slot deteriorates. There was a problem. Here, the slot is a space existing between the tooth portions constituting the magnetic poles of the stator core, and the inner circumference thereof is a yoke portion constituting the iron core, and a radial direction that is not a predetermined interval from the yoke portion in the circumferential direction. It is a space surrounded by a surface extending in the direction of the core axis of the protruding tooth portion. The tooth portion has a shape in which the tip portion in the inner diameter direction is normally expanded in the circumferential direction, and there is an opening which is a gap extending in the axial direction between the tip portions of the adjacent tooth portions. A wedge is a bundle of insertion units into each slot of a coil when a coil wound into a stator core slot is inserted, and is inserted into the yoke core and tooth inner surfaces of the stator core and the slot. The coil inserted in the slot is inserted together with the wound coil to close the opening so that the coil inserted into the slot does not protrude from the slot opening.

  Patent Document 1 describes an invention relating to “a coil insertion method and apparatus capable of inserting a coil having a very high space factor into a slot of a stator core without damage” (Patent Document 1, paragraph 0012). However, although this document discloses an invention related to insertion into a slot of a high space factor (ie, high density) coil, a measure for improving the insertability of the wedge into the slot as the density of the coil increases. Nothing is disclosed.

JP-A-5-236712

  In the coil / wedge insertion device, a wedge is inserted into a slot at the same time when the coil is inserted into the slot. A wedge pusher is usually used to insert the wedge. That is, when the wound coil is inserted into the slot, one end of the wedge is pressed with the tip of the wedge pusher and inserted into the slot. At this time, the coil outer surface may be damaged due to physical interference between the coil portion not inserted in the slot and the wedge pusher tip. In particular, after the coil is inserted into the slot to some extent, the length of the non-inserted portion of the coil is shortened, and the force acting on the non-inserted portion in the stator inner diameter direction increases as the length becomes shorter. . For this reason, the tip of the wedge pusher and the non-inserted portion of the coil may come into contact with each other and the coil coating may be damaged.

  FIG. 8 shows a conventional wedge pusher devised to prevent this, and shows an example in which the thickness of the tip of the surface facing the coil of the wedge pusher is inclined. In FIG. 8, 9 is a wedge pusher, 91 is a thick inclined surface at the tip of the wedge pusher 9, and 92 is a wedge pressing surface that presses the wedge at the tip of the wedge pusher 9. FIG. 9 shows a state where the wedge is inserted into the slot using the conventional wedge pusher 9 shown in FIG. 8 in accordance with the insertion of the coil into the iron core slot. In FIG. 9, 1 is an iron core, 2 is a coil, 8 is a wedge, and the other numbers are the same as in FIG. The wedge 8 is pushed by the wedge pressing surface 92 of the wedge pusher 9 at its end (hereinafter referred to as a wedge pressure receiving end surface), so that the wedge 8 moves upward in FIG. . At this time, the wedge pusher 9 is formed so that its tip is as far away from the coil as possible, and has a smooth inclined surface 91 so that the coil is not easily damaged even if it comes into contact. However, since the tip end portion is the thick inclined surface 91 as described above, the surface that presses the wedge pressure receiving end surface has a small width in the stator radial direction. As already described, since the insertion resistance increases when the wedge 8 is inserted into the slot as the high-density coil 2 is inserted into the slot, the wedge pressing surface of the wedge pusher 9 is caused by the deflection of the wedge 8 or the like. The position of the wedge 8 is likely to be shifted on 92. When such a position shift of the wedge 8 occurs, the wedge 8 is detached from the wedge pressing surface 92, and the insertion failure of the wedge 8 into the slot is likely to occur.

The coil / wedge insertion device according to the present invention is provided between a tooth portion adjacent in the circumferential direction of the iron core in order to attach the wound coil to a plurality of tooth portions arranged on the inner circumference of the stator core of the motor. The coil and the insertion unit into each slot of the coil are bundled in a slot which is a space of the coil, insulating between the iron core located around the slot and closing the radially inner opening of the slot A coil wedge insertion device for inserting a wedge for
A blade arranged on the circumference corresponding to the tooth position and a blade for hooking the wound coil and a predetermined direction together with the blade for pressing the coil hung on each blade A movable stripper, the wedge pressing wedge pusher movable in the same direction as the stripper, and a plurality of wedges arranged on the circumference for guiding the wedge and the wedge pusher in correspondence with the position of the wedge pusher A wedge pusher, wherein the wedge pusher is provided with a structure for preventing the wedge from being displaced at a tip portion that presses the wedge.

  The position of the wedge pressure receiving end surface is restrained by the structure for preventing displacement of the wedge pusher tip, making it difficult to remove from the wedge pusher tip, so even when inserting a high-density coil into the slot, insert the wedge into the slot. Improved.

Embodiment 1 FIG.
FIG. 1 shows a coil / wedge insertion device according to Embodiment 1 of the present invention and a state when insertion of a coil and a wedge wound in a slot of a stator core of an electric motor or the like is completed using this device. It is side surface sectional drawing. In the figure, reference numeral 1 denotes a stator core such as an electric motor, which is supported by a fixed core support portion (not shown). 2 is a wound coil inserted into the slot of the stator core, 3 is a blade for hooking the coil 2 to insert the wound coil 2 into the slot, and the arrangement of the teeth of the stator core 1 Are arranged on the circumference corresponding to Reference numeral 4 denotes a blade holder that holds the blade 3 and drives the blade 3 in the axial direction of the stator core 1. Reference numeral 5 denotes a blade holder drive shaft for driving the blade 3 in the stator core axial direction via the blade holder. Is a stripper for supporting the coil 2 hung on the blade 3 and inserting the coil 2 into the slot by inserting it into the axial hole of the stator core 1 together with the blade 3, and 7 is a stripper 6 for the stator A stripper drive shaft for driving the stripper 6 in the axial direction for insertion into the axial hole of the iron core 1, 8 closes the slot opening with respect to the coil 2 inserted in the slot and bundles the coil 2, A wedge that insulates between the coil 2 and the inner wall surface of the slot, 9 is a wedge pusher that presses the pressure receiving end surface of the wedge 8 and inserts it into the slot, and 10 is a wedge. When the pressure receiving end surface is pressed by the wedge pressing surface at the tip of the wedge pusher 9, a wedge guide that guides the wedge 8 toward the slot when inserted into the slot, and 11 is a wedge that holds the wedge 8. It is a magazine. A blade holder drive unit that drives the blade holder 4 to insert the blade into the axial hole of the stator core 1, and drives the stripper drive shaft 7 to insert the stripper 6 into the axial hole of the stator core 1. There are a stripper driving unit for driving the wedge pusher 9 and a wedge pusher driving unit for driving the wedge pusher 9 in the axial direction of the stator core 1 and inserting the wedge into the slot, but this is omitted in FIG. That is, the coil / wedge insertion device includes an iron core support, not shown, blade 3, blade holder 4, blade holder drive shaft 5, stripper 6, stripper drive shaft 7, wedge pusher 9, wedge guide 10, wedge magazine 11, and A blade holder driving unit, a stripper driving unit, and a wedge pusher driving unit (not shown) are provided.

  FIG. 2 is a perspective view showing the shape of the vicinity of the tip of the wedge pusher 8 according to Embodiment 1 of the present invention. In the figure, the wedge pusher 9 has an upper surface corresponding to the tip portion, 91 is a surface facing the coil, and is a thickness inclined surface whose thickness is inclined obliquely toward the tip portion. 92 is a wedge pressing surface at the tip of the wedge pusher 9, and 93 is a protrusion provided on the wedge pressing surface 92. In this example, the protrusions 93 are provided on the side closer to and far from the thickness inclined surface 91, respectively. FIG. 3 shows the case where the wedge pusher 9 is used in the coil / wedge insertion device shown in FIG. 1 and the wedge pusher 9 presses the lower end surface (that is, the pressure receiving end surface) of the wedge 8 as shown by the arrow in FIG. It is a figure when it sees from a direction. The meanings of the numbers in FIG. 3 are the same as those in FIGS. As shown in FIG. 3, the wedge 8 is pressed by the wedge pressing surface 92 in a state where the pressure receiving end surface of the wedge 8 enters between the protrusions 93 on the wedge pressing surface 92 of the wedge pusher 9. Go to. When the wedge pusher 9 shown in the present embodiment is used, the vicinity of the pressure receiving end surface of the wedge 8 is sandwiched by the projection 93 provided on the wedge pressing surface 92 of the wedge pusher 9. The release from the wedge pressing surface 92 can be prevented.

  2 and 3, the case where there are two protrusions 93 so as to sandwich the wedge 8 has been described, but each may be divided into a plurality of protrusions. Further, even if a groove is formed on the wedge pressing surface 92 instead of the protrusion, the same effect can be obtained by the pressure receiving end surface of the wedge 8 entering the groove.

Embodiment 2
The present embodiment is characterized in that the protrusion 93 provided on the wedge pressing surface 92 of the wedge pusher 9 is provided only on the thick inclined surface 91 side, not sandwiching the wedge pressure receiving end surface.
FIG. 4 and FIG. 5 show such examples. FIG. 4 is a perspective view of the wedge pusher 9 in which the protrusion 93 is provided on the thickness inclined surface 91 side of the wedge pressing surface 92 of the wedge pusher 9.

  FIG. 5 shows a state in which the wedge 8 is inserted into the slot using the wedge pusher 9 shown in FIG. 4 as viewed from the direction of the arrow in FIG. Providing the projections 93 only on the side of the thick inclined surface 91 in this way is considered not to be so high even if, for example, the coil density in the core slot is high. In such a case, since the pressing force from the coil 2 is not high, the wedge 8 is easy to move in the slot on the side facing the coil 2, that is, in the direction of the thick inclined surface 91. Therefore, by providing the protrusion 93 on the thick inclined surface 91 side with respect to the wedge 8, it is possible to prevent the wedge 8 from falling off the wedge pressing surface 92 of the wedge pusher 9.

Embodiment 3
The present embodiment is characterized in that the projection 93 provided on the wedge pressing surface 92 of the wedge pusher 9 is provided on the opposite side of the wall thickness inclined surface 91 instead of sandwiching the wedge pressure receiving end surface. is there. 6 and 7 show such examples. FIG. 6 is a perspective view of the wedge pusher 9 in which the protrusion 93 is provided on the side opposite to the thickness inclined surface 91 of the wedge pressing surface 92 of the wedge pusher 9.

  FIG. 7 shows a state in which the wedge 8 is inserted into the slot using the wedge pusher 9 shown in FIG. 6 as viewed from the direction of the arrow in FIG. Providing the protrusions 93 only on the side opposite to the thick inclined surface 91 in this way can be considered, for example, when the coil density in the core slot is particularly high. In such a case, the wedge 8 is pushed by the coil 2 and easily moves in the slot on the side opposite to the coil 2, that is, on the side opposite to the thick inclined surface 91. Therefore, by providing the protrusion 93 on the opposite side of the thick inclined surface 91 with respect to the wedge 8, it is possible to prevent the wedge 8 from dropping from the wedge pressing surface 92 of the wedge pusher 9.

Embodiment 4
In this embodiment, the pressing surface 92 of the wedge pusher 9 is roughened. As a result, the wedge 8 is prevented from slipping on the pressing surface 92, thereby preventing the wedge 8 from falling off the surface.

  The present invention can be used to realize a high-efficiency motor by winding it at high density around a magnetic pole such as an electric motor.

It is side surface sectional drawing which shows the coil wedge insertion apparatus by Embodiment 1 of this invention. It is a perspective view which shows the shape of the wedge pusher by Embodiment 1. FIG. FIG. 6 is a diagram illustrating insertion of a wedge into a slot by the wedge pusher according to the first embodiment. It is a perspective view which shows the shape of the wedge pusher by Embodiment 2. FIG. It is a figure which shows insertion in the slot of the wedge by the wedge pusher by Embodiment 2. FIG. It is a perspective view which shows the shape of the wedge pusher by Embodiment 3. FIG. It is a figure which shows insertion in the slot of the wedge by the wedge pusher by Embodiment 3. FIG. It is a perspective view which shows the shape of the conventional wedge pusher. It is a figure which shows the insertion in the slot of the wedge by the conventional wedge pusher.

Explanation of symbols

  1 Stator core, 2 coils, 3 blades, 4 blade holders, 5 blade holder drive shafts, 6 strippers, 7 stripper drive shafts, 8 wedges, 9 wedge pushers, 10 wedge guides, 11 wedge magazines, 91 thick inclined surfaces, 92 Wedge pressing surface, 93 protrusion

Claims (4)

In order to attach the wound coil to a plurality of teeth arranged on the inner periphery of the stator core of the electric motor, the coil and the coil are placed in a slot that is a space between adjacent teeth in the circumferential direction of the iron core. Coil wedge insertion for bundling insertion units into each slot of the coil, inserting a wedge for insulating the iron core located around the slot and closing the radially inner opening of the slot A device,
A blade arranged on the circumference corresponding to the tooth position and a blade for hooking the wound coil and a predetermined direction together with the blade for pressing the coil hung on each blade A movable stripper, the wedge pressing wedge pusher movable in the same direction as the stripper, and a plurality of wedges arranged on the circumference for guiding the wedge and the wedge pusher in correspondence with the position of the wedge pusher And a wedge pusher, wherein the wedge pusher is provided with a structure for preventing the wedge from being displaced at a tip portion that presses the wedge. 2. The coil / wedge insertion device according to claim 1, wherein the wedge position shift preventing structure at the tip of the wedge pusher is provided with a protrusion on at least one of the radially inner side and the outer side. 2. The coil / wedge insertion device according to claim 1, wherein the structure for preventing wedge position deviation at the tip of the wedge pusher has a groove on the wedge pressing surface of the tip. 2. The coil / wedge insertion device according to claim 1, wherein the wedge position shift preventing structure at the tip of the wedge pusher is a roughened wedge pressing surface of the tip.

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