JP2006345650A - Teeth structure for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a teeth structure for a motor that can increase a winding share remarkably, can achieve the reduction of manufacturing cost and efficient winding work, and by which a small and highly efficient motor can be obtained. <P>SOLUTION: In the teeth structure for a motor that protrudes in the radial direction D of a core and has top expansion portions 4 expanded in a tapered shape to both sides of the circumferential direction R of the core at the top end portions to form semienclosed slots 8 that pass windings 7 between neighboring teeth 1, steps 5 that extend in the axial direction of a motor for the prevention of the collapse of the windings 7 are formed on the surfaces at the semienclosed slot 8 sides of the top expansion portions 4. The windings 7 can be held in a stable state on the steps 5 even if wound up to the top expansion portions 4 and the collapse of the windings 7 can be prevented, so that the share of the windings 7 can remarkably be increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tooth structure for a motor for applying a winding such as an armature winding or a field winding to a motor core.

  Conventionally, as a tooth in a motor, for example, at a tip portion protruding in the radial direction of a core of a stator core or a rotor core, a tip enlarged portion which is enlarged in a taper shape on both sides in the circumferential direction of the core is formed, and between adjacent teeth. One that forms a semi-closed slot through which a winding passes is known.

  In addition, in a motor that employs a tooth that forms such a semi-closed slot, in order to improve the efficiency of the motor by increasing the occupancy of the coil in the semi-closed slot, the core and the coil are insulated from each tooth. This insulator is projected only in the axial direction from the winding portion covering the axial end surface and both side surfaces of the teeth and the edge of the winding portion corresponding to the root side and the tip side of the tooth. The root side locking portion and the tip side locking portion that prevent the winding wound around the wound portion from moving in the radial direction are formed. Furthermore, when the root of the tooth is formed in a round shape, the root side locking portion corresponding to the round shape root and the both side surfaces of the wound portion according to the diameter of the wire constituting the winding. A stepped shape is known (for example, see Patent Document 1).

JP 2001-95188 A

  However, according to various experimental studies by the present inventor, it has been found that there are problems as described below when the insulator disclosed in Patent Document 1 is used.

  That is, the insulator is for teeth only, and the base side locking portion and the tip side locking portion protrude in the axial direction from the edge of the wound portion, so that it is made inflexible by, for example, resin or the like. There is a need. For this reason, there is a concern that the manufacturing cost may increase, and the number of components of the motor increases, so that the assembly is complicated and the manufacturing cost is increased.

  Further, this insulator is mounted so as to cover both end surfaces of the teeth in the axial direction, and a portion corresponding to the end surface has a root side locking portion and a tip side locking portion, so that it is formed relatively thick. There is a need to. For this reason, when winding around a tooth | gear, there is a concern that the height of the winding of a motor axial direction may become high, and it may interfere with size reduction of a motor.

  Furthermore, since the root side locking part and the tip side locking part are formed, for example, during winding work, the winding nozzle of the winding device collides with the tip side locking part, and the tip side locking part and The winding nozzle may be damaged. Damage to the front end side locking portion and the winding nozzle is a factor that causes a reduction in the efficiency of the winding work.

  Insulators are also inflexible, their strength is weak, and there is a risk of damage during winding work, so it is not possible to wind with sufficient tension applied to the conductors. A gap is generated, and as a result, it is difficult to sufficiently increase the occupation ratio.

  Furthermore, as shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the distal end enlarged portion 51a formed on the distal end portion of the tooth 51 in a taper shape on both sides in the circumferential direction. No measures are taken for the surface of the semi-closed slot 53 side.

  For this reason, for example, as shown in FIG. 5A, when a round wire 52 having a circular cross section as a conducting wire constituting the winding is to be aligned and wound around the tip enlarged portion 51a, the round wire 52 ( (Shown with hatching) slides down from the tapered slope, and rolls out. Therefore, in order to avoid the collapse of the round wire 52, as shown in FIG. 5 (b), the winding is aligned while avoiding the vicinity of the tip enlarged portion 51a. A relatively large gap 53a is formed in the vicinity of 51a. The winding occupation ratio is reduced by the amount corresponding to the relatively large gap 53a.

  Similarly, as shown in FIG. 6A, when a square wire 55 having a square cross section as a conducting wire constituting a winding is to be aligned and wound around the tip enlarged portion 51a, the square wire 55 (hatching) applied to the tip enlarged portion 51a is also shown. Will slide down from the taper-shaped slope and cause collapse. Therefore, also in this case, in order to avoid the collapse of the rectangular line 55, as shown in FIG. A relatively large gap 53a is formed in the vicinity of the tip enlarged portion 51a, and the occupation ratio is reduced by an amount corresponding to the gap 53a.

  5 (a), 5 (b) and FIGS. 6 (a), 6 (b), only the winding on one side of the tooth 51 is shown, and the insulator disclosed in Patent Document 1 is not shown. ing.

  Accordingly, the object of the present invention made in view of such points is to dramatically increase the occupancy ratio of the windings, reduce the number of motor components, improve the assembly workability, reduce the manufacturing cost, and An object of the present invention is to provide a tooth structure for a motor that can improve the efficiency of winding work and can realize a small and highly efficient motor.

  The invention of the tooth structure for a motor according to claim 1, which achieves the above object, has a tip enlarged portion projecting in a radial direction of the core and having a tip enlarged portion which is enlarged in a tapered shape on both sides in the circumferential direction of the core. In the tooth structure for a motor that forms a semi-closed slot through which a winding is passed between a tooth and a tooth to be wound, the end-enlarged portion extends in the axial direction of the motor on the surface on the semi-closed slot side, and the winding of the coil is collapsed. It is characterized in that a step for preventing the above is formed.

  According to a second aspect of the present invention, in the motor tooth structure according to the first aspect, the step is formed in a plurality of steps.

  According to a third aspect of the present invention, there is provided the tooth structure for a motor according to the first aspect, wherein the step is formed in a plurality of steps corresponding to the diameter of the conductive wire constituting the winding to hold the conductive wire. To do.

  According to the first aspect of the present invention, since the step is formed by extending in the axial direction on the semi-closed slot side surface of the tip enlarged portion of the tooth, the tip enlarged portion is provided even if winding is applied to the tip enlarged portion. The conducting wire is held in a stable state at the step portion without sliding down, and the winding of the conducting wire is prevented from being collapsed. Accordingly, since the winding can be stably applied up to the tip enlarged portion, it is possible to dramatically increase the occupation ratio of the winding. In addition, since the step is directly formed at the enlarged tip, the number of motor components can be reduced, the assembly workability can be improved, the manufacturing cost can be reduced, and the winding work can be made more efficient. It becomes possible to realize the motor.

  According to the second aspect of the present invention, since a plurality of steps in the stepwise direction are formed in the axial direction on the semi-closed slot side surface of the tip enlarged portion, the tip enlarged portion is more stable over a wide range. Thus, the winding can be applied, and the occupation ratio of the winding can be further increased, so that a smaller and more efficient motor can be realized.

  According to the third aspect of the present invention, a plurality of steps at the tip enlarged portion are formed in a step shape corresponding to the diameter of the conducting wire constituting the winding to hold the conducting wire, so that the winding can be applied more stably. Thus, the winding occupation ratio can be further increased.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a tooth structure for a motor according to the present invention will be described with reference to the drawings.

  1 to 4 show an embodiment of a tooth structure for a motor according to the present invention. FIG. 1 (a) is a front view of the tooth, FIG. 1 (b) is a view as seen from an arrow A in FIG. FIG. 3 is a diagram schematically showing a winding state of a round wire to a tooth, and FIG. 3 is a cross-sectional view showing an embodiment of an actual winding state.

  The teeth 1 shown in FIGS. 1A and 1B are attached to the cores of the stator core and the rotor core so as to protrude in the radial direction D, and are root portions fitted to the core peripheral surface in the motor axial direction W. 2, a projecting portion 3 extending in the radial direction D in a state of being attached to the core, and a tip enlarged portion 4 formed at the tip portion of the projecting portion 3 in a taper shape on both sides in the circumferential direction R of the stator core. As shown in FIG. 2, a semi-closed slot 8 through which the winding 7 is passed is formed between each tooth 1 mounted adjacent to the core.

  In the present embodiment, in the tooth structure having such a tip enlarged portion 4, the winding 7 is unrolled by extending in the axial direction W of the motor on the surface of the tip enlarged portion 4 on the semi-closed slot 8 side. A plurality of steps 5 for prevention are formed in a staircase pattern according to the cross-sectional dimensions of the round wire 6 having a circular cross-section that is a conducting wire constituting the winding 7.

  In this way, by forming a plurality of steps 5 on the surface of the tip enlarged portion 4 on the side of the semi-closed slot 8, as shown in FIG. When forming 7, the round wire 6 applied to the distal end enlarged portion 4 is securely held by the step 5 without sliding down to the protruding portion 3 side. Accordingly, since the round wire 6 can be aligned and wound over the surface of the tip enlarged portion 4 on the side of the semi-closed slot 8 without causing collapse, the occupancy rate of the winding 7 in the semi-closed slot 8 is dramatically increased. Can be increased.

  Further, as shown in FIG. 3, even when an insulator 11 is interposed between the tooth 1 and the winding 7, the winding is performed using the flexible insulator 11 made of paper or the like along the shape of the tooth 1. 7 can be applied. FIG. 3 shows a case in which the teeth 1 are mounted on a stator core 13 as a core and the winding 7 is formed by winding the round wires 6 in an aligned manner.

  As described above, the winding 7 can be stably applied over a wide range of the enlarged tip portion 4, and the occupation ratio of the winding 7 can be dramatically increased, thereby realizing a small and highly efficient motor. can do. And since the level | step difference 5 is directly formed in the front-end | tip enlarged part 4, the non-flexible insulator only for teeth like the patent document 1 becomes unnecessary. Accordingly, the number of components of the motor can be reduced, the assemblability can be improved, the manufacturing cost can be reduced, and the efficiency of the winding work can be improved. Miniaturization can be achieved.

  Further, as shown in FIG. 3, even when the insulator 11 is interposed between the stator core 13, the teeth 1, and the winding 7, the flexible insulator 11 made of paper or the like can be used. The wire 6 can be wound with sufficient tension. As a result, the occupation ratio can be further increased, and the motor can be further reduced in size and efficiency.

  Similarly, as shown in FIG. 4, when the winding 10 is formed by winding a square wire 9 having a square cross section as a conducting wire around the tip enlarged portion 4, the square wire 9 applied to the tip enlarged portion 4 protrudes. Since the step 5 is securely held by the step 5 without sliding down to the portion 3 side, the square wire 9 can be aligned and wound around the semi-closed slot 8 side surface of the tip enlarged portion 4 without causing collapse. The occupation ratio of the winding 10 in the closed slot 8 can be dramatically increased.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, the number, shape, and size of the step 5 formed on the surface of the tip enlarged portion 4 on the semi-closed slot 8 side can be arbitrarily set, and can be appropriately set according to the cross-sectional shape and dimensions of the conducting wire to be wound. It can also be set. Further, the tooth structure according to the present invention can be similarly applied to the case where the teeth are formed integrally with the core.

It is a figure of teeth showing an embodiment of a teeth structure for motors by the present invention, (a) is a front view of teeth and (b) is an A arrow view of (a). It is a figure which shows typically the winding state of the round wire to the teeth shown in FIG. Similarly, it is sectional drawing which shows the one aspect | mode of the actual winding state to the teeth shown in FIG. It is a figure which shows typically the winding state of the square wire to the teeth shown in FIG. It is a figure which shows the conventional teeth structure. Similarly, it is a figure which shows the conventional teeth structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Teeth 2 Root part 3 Protrusion part 4 Tip expansion part 5 Level difference 6 Round wire (conductor)
7 Winding 8 Semi-closed slot 9 Square wire (conductor)
10 Winding 11 Insulator 13 Stator core (core)
R Core circumferential direction W Motor axial direction

Claims (3)

A tooth for a motor that protrudes in the radial direction of the core and has a tip enlarged portion that is enlarged in a taper shape on both sides in the circumferential direction of the core, and forms a semi-closed slot through which a winding passes between adjacent teeth. In structure
A tooth structure for a motor, wherein a step for extending the axial direction of the motor to prevent the winding from collapsing is formed on a surface on the semi-closed slot side of the tip enlarged portion.   2. The tooth structure for a motor according to claim 1, wherein a plurality of the steps are formed stepwise. 2. The tooth structure for a motor according to claim 1, wherein a plurality of steps are formed in a step shape corresponding to the diameter of the winding to hold the winding.

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