JP2006296141A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor having satisfactory working efficiency even in winding a stator coil by avoiding waste in the material of an insulating sheet that becomes a core insulating member. <P>SOLUTION: In the core insulating member 60 inserted into a slot 55 between magnetic pole teeth 53 each, coil accommodations 65 are provided each at both sides, and a plurality of separation holes 60 are provided as regularly arranged at the intermediate section of the coil accommodation sections 65. In this case, when the stator coil 48 is wound around the magnetic pole teeth 53 for accommodating in the coil accommodation sections 65, separation can be made at the portion of the separation hole 60 by the tension of the stator coil 48 in the electric motor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor having a core insulating member provided between a stator core and a stator coil wound around magnetic pole teeth of the stator core.

  A conventional electric motor is provided with a plurality of magnetic pole teeth projecting inwardly on a stator core having a rectangular outer shape formed by laminating plate-like magnetic materials, and both side portions are curved in the slot portion between these adjacent magnetic pole teeth. There is one in which an insulating sheet having a coil winding recess is inserted. This insulating sheet is provided with a triangular bent convex portion or a cut slit portion at the middle portion between the two coil winding concave portions.

  When the stator coil is wound around the magnetic teeth through the insulating sheet, the coil winding recesses on both sides of the insulating sheet are directed toward the inner wall surface of the slot portion of the stator core by the stator coil to which tension is applied. Press contact. At this time, the insulating sheet is pulled from the direction of both sides where the coil winding recesses are provided, but the one provided with the bent protrusions has a lower height so that the inner wall surface of the slot portion and the insulating sheet A gap that reduces the winding space is not formed between the two.

In addition, in the case where one slit portion separated from one end portion is provided in the middle portion between the two coil winding recesses, the insulating sheet is respectively pulled from the direction of both side portions where the coil winding recesses are present. The gap formed between the inner wall surface of the slot portion and the insulating sheet is reduced by increasing the width of the slit portion in the width direction. (For example, see Patent Document 1)
JP 2000-50554 A (page 3, FIG. 3, FIG. 4)

  In such a conventional electric motor, in the case of the former insulating sheet, bending is required, and material may be wasted due to the formation of the bent protrusion. In the latter case, another insulating sheet is sandwiched in the slit part, and it is easy to bend at the slit part, so the handling of the insulating sheet in coil winding work is troublesome, or in the central part other than the slit part and the slit part In order to produce a difference in tensile response force from both sides having the coil winding recess, the insulating sheet may be inclined or moved to a position offset in the slot portion.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric motor that eliminates waste of the material of the insulating sheet that is a core insulating member and has good workability even when the stator coil is wound.

  The present invention includes a rotor pivotally supported by a frame, a stator core included in a stator disposed around the rotor, a plurality of magnetic pole teeth that are provided in the stator core and project toward the outer peripheral surface of the rotor, and In the electric motor comprising a core insulating member inserted in each slot portion between the magnetic pole teeth, and a stator coil wound around the magnetic pole teeth with the core insulating member interposed therebetween, the core insulating member is The coil housing portions are provided on both side portions, and a plurality of separation holes arranged with regularity are provided in the middle portion of the coil housing portions, and the stator coil is wound around the magnetic pole teeth to form the coil housing portions. The main feature is that separation is possible at the portion of the separation hole by the tension of the stator coil.

  The electric motor of the present invention is easy to handle when winding the stator coil by performing relatively simple processing on the core insulating member, which is an insulating sheet interposed between the stator core and the stator coil. Can be good.

  Embodiments of an electric motor according to the present invention will be described below with reference to FIGS.

[Example 1]
FIG. 1 shows an electric motor 2 used in an electric blower 1 according to one embodiment of the present invention. This electric motor 2 has a bottomed cylindrical frame 3, and a support arm 6 having both ends fixed to the flange portion 4 on the outer periphery of the opening of the frame 3 by screws 5 so as to cross the opening. Is provided. At the center of the support arm 6 and the frame 3, there are rotatably provided rotating shafts 9 supported at two locations by a pair of ball bearings 8 accommodated in the respective shaft support portions 7.

  The rotary shaft 9 is a rotor which is a rotor in which a commutator 12 having a large number of commutator pieces 11 on the outer periphery and an armature coil 13 whose ends are connected to the commutator pieces 11 are wound around an armature core 14. 15 is provided. Further, the tips of carbon brushes 17 accommodated in a pair of carbon brush devices 16 fixed to the frame 3 are pressed against the outer periphery of the commutator 12.

  A fan 20 is attached to the tip of the rotating shaft 9. The fan 20 includes an upper fan plate 22 and a lower fan plate 23 each having a disk-shaped suction port 21, and a spiral fan blade 24 fixed between the upper fan plate 22 and the lower fan plate 23. The center hole is inserted into the rotary shaft 9 and fixed by the nut 25. Furthermore, the fan 20 is fitted and fixed to the outer peripheral end of the flange portion 4 of the frame 3 and is covered with a bowl-shaped fan cover 27 having a circular inlet 26 at the center.

  Between the fan 20 and the support arm 6, a disk-like diffuser 30 is attached to the support arm 6 by a pair of screws 31 that are positioned relative to each other with the shaft support 7 of the support arm 6 as a center. . The diffuser 30 is provided with a rectifying plate 32 provided in a spiral shape with a position corresponding to the outer periphery of the fan 20 as an inlet, and a ventilation path 33 formed by the rectifying plate 32 is provided in a disc portion 34 of the diffuser 30. Several outflow holes (not shown) communicate with an air passage 36 formed by a downstream rectifying plate 35 provided on the back side. Further, the air passage 36 communicates from both side portions of the support arm 6 to the outer peripheral portion of the rotor 15. A stator 40 that is indirectly fixed to the frame 3 is provided on the outer peripheral portion of the armature core 14 of the rotor 15.

  Next, the stator 40 which is a stator will be specifically described with reference to FIGS. 2 and 3 are a front view and a side view of the stator 40. A stator core 41 made of a laminated iron core is sandwiched from both surfaces by an upper insulating block 42 and a lower insulating block 43 formed of insulating resin. In the upper insulating block 42 and the lower insulating block 43, a plurality of mounting projections 44 provided integrally with each other are press-fitted into four mounting holes 45, which are drilled on the upper surface and the lower surface of the stator core 41, respectively. These are integrated as a stator 40.

  The upper insulating block 42 and the lower insulating block 43 are respectively fixed to the frame 3 by means not shown. These are provided with a holding portion 49 of the wound stator coil 48 and terminal blocks 50 for holding the lead wires of the stator coil 48 and the carbon brush device 16 described above at a plurality of locations.

  Further, as shown in FIG. 4 showing the stator coil 48 in cross section, the stator core 41 is provided with two magnetic teeth 53 projecting from the quadrangular yoke portion so that its width is expanded toward the center. The tip portions of these magnetic teeth 53 have arcuate portions 54 that are parallel to the outer peripheral surface of the rotor 15. Between the adjacent magnetic pole teeth 53, there are slot portions 55 each having a U-shape and the opening portions face each other. Each of these slot portions 55 has a core that is an insulating sheet. The insulating member 60 is inserted in close contact so as to fit.

  Before these core insulating members 60 are assembled in the electric motor 2, an insulating film-like plastic insulating sheet is used as a material, and as shown in FIG. 5, both sides of the elongated rectangular shape are bent in the same direction. Thus, a curved portion 61 is formed. In addition, a large number of separation holes 64 each having a small circular hole that penetrates are provided in a straight line in the middle portion of the left and right curved portions 61 so as to cross from the upper end portion 62 toward the lower end portion 63. Yes. The separation holes 64 are regularly arranged at equal intervals. When the separation holes 64 are strongly pulled from the left and right sides, the separation holes 64 are cut at the separation holes 64 and the core insulating member 60 is separated right and left. ing.

  Next, the process in the case of incorporating this core insulating member 60 into the electric motor 2 will be described. First, the two core insulating members 60 are inserted into the respective slot portions 55 between the adjacent magnetic pole teeth 53 of the stator core 41 from the upper side while further bending the bending portions 61 to fix the positions. Thereby, the coil accommodating part 65 is formed in the both sides enclosed by each curved part 61. FIG. Then, the stator coil 48 is wound several times by the winding machine (not shown) inside the coil housing portion 65 and between the coil housing portions 65 of the pair of core insulating members 60 on both sides of the magnetic teeth 53. Turn.

  By accommodating the stator coil 48 wound several times in the coil housing portion 65, the coil housing portion 65 is pressed against the inner wall surface of the slot portion 55 from the inside. At that time, the core insulating member 60 is pulled from both sides in order to fill a gap between the coil housing portion 65 of the core insulating member 60 and the inner wall surface of the slot portion 55. It is possible to ensure the length of the pulled portion by cutting at a location and separating the left and right. As a result, the gap between the core insulating member 60 and the inner wall surface of the slot portion 55 can be removed and brought into close contact, and the space of the slot portion 55 can be utilized to the maximum.

  When the core insulating member 60 is pulled from both side portions, the separation holes 64 are regularly arranged at equal intervals in the central portion, so that when the core insulating members 60 are pulled from both side portions, they are momentarily cut and left and right Therefore, the core insulating member 60 is pressed against the inner wall surface without being inclined with respect to the slot portion 55. As a result, the core insulating member 60 can be reliably interposed between the stator coil 48 and the stator core 41, and the risk of electrical contact and short circuit between them can be eliminated.

  The core insulating member 60 in the state in which the winding of the stator coil 48 is finished is separated into right and left at the separation hole 64 at the center, and a separation space 66 having a uniform width as shown in FIG. 4 is formed. Is formed. Further, the upper end portion 62 and the lower end portion 63 of the core insulating member 60 protrude upward and downward from the upper insulating block 42 and the lower insulating block 43, respectively, to improve the insulation between the stator coil 48 and the stator core 41. .

[Example 2]
With reference to FIG. 7, another embodiment of the core insulating member 60 will be described. FIG. 7A shows a case in which separation holes 64 made of perforated cuts at equal intervals are provided in a central portion of the core insulating member 60. FIG. 7B shows a linear arrangement of separation holes 64 in which rhombus-shaped through holes 67 and circular small holes 68 are alternately provided. FIG. 7C shows a case in which separation holes 64 made of quadrangular square holes are provided in a line at equal intervals.

  The separation holes 64 made up of these through holes are arranged between the upper end portion 62 and the lower end portion 63 with a certain regularity such as a repeated state. When the core insulating member 60 is cut at the same time and separated into the left and right when pulled, the coil storage portion 65 of the core insulating member 60 is brought into close contact with the inner wall surface of the slot portion 55 without being inclined. Can be used effectively, and workability and insulation can be improved.

Example 3
Another embodiment of the core insulating member 60 will be described with reference to FIG. FIG. 8D shows cuts that form the uncut portions 70 having the same length at symmetrical positions that are the same distance from the center between the upper end 62 and the lower end 63 of the core insulating member 60. One separation hole 64 is provided. The presence of the two uncut portions 70 having the same length at both ends facilitates the handling of the core insulating member 60, and when the stator coil 48 is wound, the core insulating member 60 is caused by its tension. The slot portion 55 can be separated left and right without being inclined.

  Further, FIG. 8E shows three uncut portions 70 having the same length at symmetrical positions that are equal in the vertical direction from the center between the upper end 62 and the lower end 63 of the core insulating member 60. Two separation holes 64 serving as cuts formed at the locations are provided. Further, FIG. 8 (f) shows that three separation holes 64 and four cuts are formed at symmetrical positions at equal distances in the vertical direction from the center between the upper end 62 and the lower end 63 of the core insulating member 60. A remaining portion 70 is provided. The separation hole 64 in the center is shorter than the two separation holes 64 on both sides having the same length, and two uncut portions 70 having the same length in the center are formed by an upper end 62 and a lower end. 63, the length is slightly shorter than two uncut portions 70 having the same length. These (e) and (f) make it easier to handle the core insulating member 60 than in FIG. 8 (d), and improve the workability when winding the stator coil 48.

  In any of the first to third embodiments, each of the upper end 62 and the lower end 63 of the core insulating member 60 is not provided with a separation hole 64 such as a cut at both ends, and is a left uncut portion. Further, the end portion of the other core insulating member 60 is not sandwiched between the separation holes 64 such as cuts.

  As described above, the present invention is not limited to the above embodiment, and can be modified without departing from the spirit of the present invention.

It is a partial cross section figure of the electric blower using the electric motor by this invention. Example 1 It is a front view of the stator of the electric motor shown in FIG. It is a side view of the stator of the electric motor shown in FIG. It is the top view of the stator which showed the stator coil of the electric motor shown in FIG. 1 in the cross section. It is a perspective view of the core insulation member used for the electric motor shown in FIG. FIG. 2 is a partial cross-sectional view of a stator and a rotor of the electric motor shown in FIG. 1. It is a front view which shows the center part of the other core insulation member of the electric motor by this invention. (Example 2) It is a front view which shows the center part of the other core insulation member of the electric motor by this invention. Example 3

Explanation of symbols

2 Electric motor 3 Frame 15 Rotor 40 Stator 41 Stator core 48 Stator coil 53 Magnetic teeth 55 Slot part 60 Core insulation member 61 Bending part 64 Separation hole 65 Coil storage part

Claims (4)

A rotor pivotally supported by the frame;
A stator core having a stator disposed around the rotor;
A plurality of magnetic teeth that protrude from the stator core toward the outer peripheral surface of the rotor;
A core insulation member inserted in each slot portion between these magnetic pole teeth;
In an electric motor comprising a stator coil wound around the magnetic pole teeth with these core insulating members interposed therebetween,
The core insulating member is provided with coil accommodating portions on both side portions, and a plurality of separation holes regularly arranged in the middle portion of the coil accommodating portions, and the stator coil is wound around the magnetic pole teeth. The motor can be separated at the separation hole portion by the tension of the stator coil when housed in the coil housing portion. A rotor pivotally supported by the frame;
A stator core having a stator disposed around the rotor;
A plurality of magnetic teeth that protrude from the stator core toward the outer peripheral surface of the rotor;
A core insulation member inserted in each slot portion between these magnetic pole teeth;
In an electric motor comprising a stator coil wound around the magnetic pole teeth with these core insulating members interposed therebetween,
The core insulating member is provided with coil accommodating portions on both side portions, and is left uncut at intermediate positions between these coil accommodating portions and symmetrically in the vertical direction from the center between the upper end portion and the lower end portion. A separation hole for forming the stator coil, and when the stator coil is wound around the magnetic teeth and housed in the coil housing portion, the uncut portion is cut by the tension of the stator coil so as to be separable. Electric motor. A rotor pivotally supported by the frame;
A stator core having a stator disposed around the rotor;
A plurality of magnetic teeth that protrude from the stator core toward the outer peripheral surface of the rotor;
A core insulation member inserted in each slot portion between these magnetic pole teeth;
In an electric motor comprising a stator coil wound around the magnetic pole teeth with these core insulating members interposed therebetween,
The core insulating member is provided with coil accommodating portions on both side portions, and at least one separation hole for forming uncut portions at the upper end portion and the lower end portion of the intermediate portion of the coil accommodating portions, and the stator. When the coil is wound around the magnetic teeth and housed in the coil housing portion, the uncut portion is cut by the tension of the stator coil so as to be separable.   4. The electric motor according to claim 1, wherein the separation holes are perforations arranged linearly with regularity.

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