JP2018088820A - Stator of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stator of an electric motor that can achieve improvement of quality while achieving improvement of a yield.SOLUTION: The stator is provided with: a core back in which a plurality of belt-like core back piece groups obtained by connecting a plurality of circular core back pieces 1a, 1b, 1c, 1d, 1e and 1f are laminated; and a plurality of teeth in which a plurality of teeth pieces 2a, 2b, 2c, 2d, 2e and 2f are laminated, and which are arranged inside an annularly-formed core back piece group in a diameter direction to be extended toward a center of the core back; and a groove having a shape in which each end of the plurality of teeth pieces 2a, 2b, 2c, 2d, 2e and 2f is fitted is formed in each concave side of the plurality of core back pieces 1a, 1b, 1c, 1d, 1e and 1f.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator for an electric motor configured by laminating a plurality of core back pieces and teeth pieces punched from an electromagnetic steel sheet.

  A conventional stator of an electric motor disclosed in Patent Document 1 includes an annular yoke and a plurality of teeth fitted and fixed to a plurality of recesses provided at regular intervals on the inner peripheral portion of the annular yoke. Prepare. After the plurality of teeth are wound, each of the teeth is fitted and fixed in a concave portion of the annular yoke.

  The stator of the conventional electric motor disclosed in Patent Document 2 connects a laminated yoke member formed by laminating a plurality of core members formed by arranging a plurality of core pieces in a strip shape, and adjacent core pieces. A plurality of thin-walled portions, and a plurality of teeth that are fitted with concave wedge-shaped portions, which are regions surrounded by the end portions and the thin-walled portions of adjacent core pieces, and are fixed to the laminated yoke member. In the stator of Patent Document 2, an annular yoke is formed by bending a thin portion after a wedge-shaped portion of a tooth with windings is fitted into a concave portion of a laminated yoke member.

International Publication No. 2013/157100 JP 2000-152526 A

  However, in the prior art of Patent Document 1, since the annular yoke is punched from the base material of the rectangular electromagnetic steel sheet, there is a problem that the base material portion that is not used as an iron core increases and the yield of the material is poor.

  In addition, the yoke of Patent Document 2 has a structure in which adjacent core pieces are connected by a thin portion, and a tooth end portion is sandwiched by a recess provided in the thin portion, so that the thin portion is subjected to stress during bending. Therefore, it is necessary to increase the structure that can withstand the stress of gripping the teeth, that is, the radial width of the thin portion. Therefore, the yoke after the thin wall portion is bent and formed into an annular shape has a problem that the roundness on the outer peripheral side is deteriorated. Moreover, since the yoke of patent document 2 is a structure which pinches | interposes a teeth end part with the recessed part provided in the thin part, the connection part of adjacent core pieces cannot be reinforced by welding, and the rigidity of a connection part falls. However, there is a problem that it is difficult to ensure the roundness of the outer periphery of the yoke.

  The present invention has been made in view of the above, and an object of the present invention is to obtain an electric motor stator capable of improving quality while improving yield.

  In order to solve the above-described problems and achieve the object, the stator of the electric motor according to the present invention includes a core back formed by stacking a plurality of band-shaped core back pieces formed by connecting a plurality of arc-shaped core back pieces. And a plurality of teeth which are formed by laminating a plurality of teeth pieces and are arranged radially inside a core back piece group formed in an annular shape and extend toward the center of the core back. In the stator of the electric motor, a groove portion having a shape in which each end portion of the plurality of teeth pieces is fitted is formed on each concave surface of the plurality of core back pieces, thereby forming a core back piece group formed in an annular shape. Among the plurality of core back pieces, welding is performed from the radially inner side surface of the core back piece to a portion where the adjacent core back piece contacts.

  The stator of the electric motor according to the present invention has an effect that the quality can be improved while the yield is improved.

The figure which shows the stator of the electric motor which concerns on Embodiment 1 of this invention. The figure which shows the arrangement state of the components of the stator core before being punched out from the electromagnetic steel sheet The figure which shows the component of the stator core after being punched from the magnetic steel sheet The figure which shows the group of the 1st teeth piece comprised from two teeth pieces after cut | disconnecting a bridge | bridging The figure which shows the group of the 2nd teeth piece comprised from two teeth pieces after cut | disconnecting a bridge | bridging The figure which shows the group of the 3rd teeth piece comprised from two teeth pieces after cut | disconnecting a bridge | bridging The figure which shows the state which mounted | worn with the resinous insulating winding frame to the group of the 1st teeth piece shown in FIG. The figure which shows the state which mounted | worn with the resinous insulation winding frame to the group of the 2nd teeth piece shown in FIG. The figure which shows the state which mounted | worn with the resinous insulation winding frame to the group of the 3rd teeth piece shown in FIG. The figure which shows the state which wound the coil | winding to the group of the 1st teeth piece which provided the insulating winding frame shown in FIG. The figure which shows the state which wound the coil | winding to the group of the 2nd teeth piece which provided the insulating winding frame shown in FIG. The figure which shows the state which wound the coil | winding to the group of the 3rd teeth piece which provided the insulating winding frame shown in FIG. The figure which shows the cyclic | annular insulation teeth part comprised by the group of three teeth pieces with which the winding shown in FIGS. 10-12 was given. Diagram showing an annular core back The figure which shows the state where welding was given to the annular core back Figure showing an example of winding the teeth 1st figure which shows the notch part formed between adjacent core back pieces among the 1st core back piece groups which comprise the stator of the electric motor which concerns on Embodiment 2 of this invention. 2nd figure which shows the notch part formed between adjacent core back pieces among the 2nd core back piece groups which comprise the stator of the electric motor which concerns on Embodiment 2 of this invention. The figure which shows the state which laminated | stacked several sheets which bent the core back piece group shown to FIG. 17 and FIG. The 1st figure which shows the core back piece group which comprises the stator of the electric motor which concerns on Embodiment 3 of this invention. The 2nd figure which shows the core back piece group which comprises the stator of the electric motor which concerns on Embodiment 3 of this invention. The figure which shows the state which laminated | stacked several core back piece groups shown in FIG. 20 and FIG. 1st arrangement | positioning drawing when punching out the core back piece group which comprises the stator of the electric motor which concerns on Embodiment 4 of this invention from an electromagnetic steel plate 2nd arrangement | positioning drawing when punching out the core back piece group which comprises the stator of the electric motor which concerns on Embodiment 4 of this invention from an electromagnetic steel plate Arrangement diagram when punching out teeth piece group constituting stator of electric motor according to embodiment 4 of the present invention from electromagnetic steel sheet

  Below, the stator of the electric motor concerning embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a view showing a stator of an electric motor according to Embodiment 1 of the present invention, FIG. 2 is a view showing an arrangement state of components of a stator core before being punched from an electromagnetic steel sheet, and FIG. FIG. 4 is a diagram showing components of the stator core after being pulled out, FIG. 4 is a diagram showing a set of first teeth pieces composed of two teeth pieces after cutting the bridge, and FIG. 5 is after cutting the bridge FIG. 6 is a diagram showing a set of second teeth pieces composed of two teeth pieces, FIG. 6 is a diagram showing a set of third teeth pieces composed of two teeth pieces after cutting the bridge, and FIG. Is a diagram showing a state in which an insulating winding frame is attached to the first set of teeth pieces shown in FIG. 4, FIG. 8 is a diagram showing a state in which an insulating winding frame is attached to the second set of teeth pieces shown in FIG. 9 is a view showing a state in which an insulating winding frame is attached to the set of third tooth pieces shown in FIG. FIG. 11 is a view showing a state in which a winding is wound around a set of first teeth pieces provided with an insulating winding frame shown in FIG. 7, and FIG. 11 is a set of second teeth pieces provided with an insulating winding frame shown in FIG. FIG. 12 is a view showing a state where the winding is wound, FIG. 12 is a view showing a state where the winding is wound around the third set of teeth provided with the insulating winding frame shown in FIG. 9, and FIG. The figure which shows the cyclic | annular insulation teeth part comprised by the group of the three teeth piece to which the coil | winding shown was given, FIG. 14 is a figure which shows a cyclic | annular core back, FIG. FIG. 16 is a diagram showing an example in which the teeth are wound.

  The stator 100 of the electric motor shown in FIG. 1 is a core back piece formed by connecting a plurality of core back pieces 1a, 1b, 1c, 1d, 1e, and 1f formed by punching the electromagnetic steel plate 50 shown in FIG. It is comprised by the cyclic | annular core back 1 formed by laminating | stacking a group of two or more groups, and the cyclic | annular insulation teeth part 3 arrange | positioned inside the core back 1 in the radial direction. The annular insulating teeth portion 3 includes a plurality of teeth 2 formed by stacking a plurality of teeth pieces 2a, 2b, 2c, 2d, 2e, and 2f formed by punching the electromagnetic steel sheet 50 into a T shape, and a plurality of teeth. A plurality of insulating members 4a, 4b, 4c, 4d, 4e, 4f, and windings 5a wound around the plurality of teeth 2 through the plurality of insulating winding frames 4a to 4f. 5b, 5c, 5d, 5e, 5f, an annular connecting member 6ad for connecting the insulating winding frame 4a and the insulating winding frame 4d, an annular connecting member 6be for connecting the insulating winding frame 4b and the insulating winding frame 4e, and insulation It is comprised by the cyclic | annular connection member 6cf which connects the winding frame 4c and the insulated winding frame 4f. The stacking direction is a direction perpendicular to the paper surface. The plurality of teeth 2 are arranged at regular intervals on the radially inner side of the core back 1 and extend toward the center of the core back 1. The core back 1 and the plurality of teeth 2 constitute a stator core.

  In FIGS. 2 and 3, three core back pieces 1a, 1b, and 1c among the six core back pieces 1a to 1f constituting the core back piece group are arranged in the longitudinal direction, and the thin connecting portions 1ab and 1bc are arranged. Of the six core back pieces 1a to 1f constituting the core back piece group, three core back pieces 1d, 1e, and 1f are connected to each other in the longitudinal direction. Arranged between the second core back piece group 1B and the first core back piece group 1A and the second core back piece group 1B, which are arranged and connected via the thin-walled connecting portions 1de and 1ef, 1st teeth piece group and 2nd core back piece comprised by three teeth pieces 2a, 2b, 2c of the shape fitted to core back piece 1a, 1b, 1c which comprises 1 core back piece group 1A Core back pieces 1d, 1e constituting the group 1B, Three teeth pieces 2d configured to fit over f, 2e, the second tooth piece group and is shown comprised of 2f. The teeth piece group 2A is formed by connecting adjacent tooth pieces among the tooth pieces 2a to 2f constituting the first tooth piece group and the second tooth piece group.

  2 and 3, the number of the plurality of core back pieces constituting the first core back piece group 1 </ b> A and the second core back piece group 1 </ b> B is three. The number of core back pieces constituting the tooth piece is not limited to the illustrated example, and the number of the plurality of tooth pieces constituting the tooth piece group 2A is not limited to the illustrated example.

  The core back pieces 1a, 1b, 1c are arranged such that the individual concave surfaces of the core back pieces 1a, 1b, 1c are opposed to the individual concave surfaces of the core back pieces 1d, 1e, 1f. Specifically, the core back piece 1f arranged on the left side of the second core back piece group 1B has the concave surface of the core back piece 1f arranged so as to be opposed to the concave surfaces of the core back pieces 1a and 1b. Is disposed relative to the bottom of the concave surface of the core back piece 1a, and the other end is disposed relative to the bottom of the concave surface of the core back piece 1b. The core back piece 1e arranged in the center of the second core back piece group 1B has a concave surface of the core back piece 1e arranged opposite to the concave surfaces of the core back pieces 1b and 1c, and one end of the core back piece 1b. The other end is disposed relative to the bottom of the concave surface of the core back piece 1c. The core back piece 1d arranged on the right side of the second core back piece group 1B has the concave surface of the core back piece 1d arranged opposite to the concave surfaces of the core back pieces 1b and 1c, and one end of the core back piece 1c. It is arranged relative to the bottom of the concave surface.

  At one end of the core back piece 1a, a protruding fitting portion 1af is formed which is fitted into a recess 1fa formed at one end of the core back piece 1f. The other end of the core back piece 1a and one end of the core back piece 1b are connected via a thin connecting portion 1ab. The other end of the core back piece 1b and one end of the core back piece 1c are connected via a thin connecting portion 1bc. The other end of the core back piece 1c is formed with a recess 1cd into which a protruding fitting portion 1dc formed at the other end of the core back piece 1d is fitted. One end of the core back piece 1d and the other end of the core back piece 1e are connected via a thin connecting portion 1de. One end of the core back piece 1e and the other end of the core back piece 1f are connected via a thin connecting portion 1ef.

  In addition, the fitting structure of the core back pieces 1a and 1f and the fitting structure of the core back pieces 1c and 1d are not limited to the illustrated example, and a recess is provided at one end of the core back piece 1a, and the core back piece 1f is provided at one end. A structure in which a protruding fitting portion is provided, a protruding fitting portion is provided at the other end of the core back piece 1c, and a recess is provided at the other end of the core back piece 1d.

  In a region surrounded by the thin-walled connecting portion 1ab, the other end of the core back piece 1a, and one end of the core back piece 1b, a V-shaped cutout portion 12ab that spreads from the concave surface of the core back piece toward the projecting surface is provided. It is done. Similarly, a region surrounded by the thin connecting portion 1bc, the other end of the core back piece 1b, and one end of the core back piece 1c, a thin connecting portion 1de, the other end of the core back piece 1e, and one end of the core back piece 1d. The region surrounded by the thin-walled connecting portion 1ef, the other end of the core back piece 1f, and one end of the core back piece 1e has a V-shaped cut extending from the concave surface of the core back piece toward the projecting surface. Notch portions 12bc, 12de, and 12ef are provided.

  Grooves 1a1, 1b1, 1c1, 1d1, 1e1, and 1f1 are formed in the center of each concave surface of the core back pieces 1a to 1f. The groove portions 1a1 to 1f1 are formed such that the widths of the respective openings 1a11, 1b11, 1c11, 1d11, 1e11, and 1f11 are narrower than the widths of the respective bottom portions 1a12, 1b12, 1c12, 1d12, 1e12, and 1f12.

  Teeth piece 2a includes a fitting portion 2a1 shaped to fit into groove 1a1 of core back piece 1a, winding portion 2a2 around which winding 5a shown in FIG. 10 is wound, and rotor-facing surface 2a3 having an umbrella-shaped tip portion 2a4. The fitting part 2a1 is formed so that the width of the end part of the fitting part 2a1 is wider than the width of the winding part 2a2. Teeth piece 2b includes a fitting portion 2b1 shaped to fit into groove 1b1 of core back piece 1b, winding portion 2b2 around which winding 5b shown in FIG. 11 is wound, and rotor-facing surface 2b3 having an umbrella-shaped tip portion 2b4. The fitting part 2b1 is formed so that the width of the end part of the fitting part 2b1 is wider than the width of the winding part 2b2. Teeth piece 2c includes a fitting portion 2c1 shaped to fit into groove 1c1 of core back piece 1c, winding portion 2c2 around which winding 5c shown in FIG. 12 is wound, and rotor-facing surface 2c3 having an umbrella-shaped tip portion 2c4. The fitting part 2c1 is formed such that the end part of the fitting part 2c1 has a width wider than that of the winding part 2c2. The teeth piece 2d includes a fitting portion 2d1 shaped to fit into the groove portion 1d1 of the core back piece 1d, a winding portion 2d2 around which the winding 5d shown in FIG. 10 is wound, and a rotor facing surface 2d3 having an umbrella-shaped tip 2d4. The fitting part 2d1 is formed so that the width of the end part of the fitting part 2d1 is wider than the width of the winding part 2d2. The teeth piece 2e includes a fitting portion 2e1 having a shape that fits into the groove portion 1e1 of the core back piece 1e, a winding portion 2e2 around which the winding 5e shown in FIG. 2e4. The fitting portion 2e1 is formed so that the width of the end portion of the fitting portion 2e1 is wider than the width of the winding portion 2e2. Teeth piece 2f includes a fitting portion 2f1 shaped to fit into groove 1f1 of core back piece 1f, winding portion 2f2 around which winding 5f shown in FIG. 12 is wound, and rotor-facing surface 2f3 having an umbrella-shaped tip portion 2f4. The fitting portion 2f1 is formed such that the end portion of the fitting portion 2f1 is wider than the winding portion 2f2.

  The shape of the groove and the fitting portion is not limited to the illustrated example as long as the tooth piece is fitted to the core back piece, but by forming the groove and the fitting portion as in the illustrated example, After the annular insulating tooth portion 3 and the annular core back 1 are fitted together, the shift between the axial center of the annular insulating tooth portion 3 and the axial center of the annular core back 1 is suppressed, and the annular insulating tooth portion 3 The positional deviation in the axial direction with respect to the annular core back 1 is further suppressed.

  The manufacturing procedure of the stator 100 will be described below. In a press apparatus (not shown), members in the following state are punched from the electromagnetic steel sheet 50. That is, the rotor facing surfaces 2a3, 2b3, 2c3 of the plurality of teeth fitted in the grooves formed in the plurality of core back pieces constituting the first core back piece group 1A are the second core back pieces. The rotor facing surfaces 2d3, 2e3 of a plurality of teeth that are in a state facing the group 1B and are fitted in grooves formed in the plurality of core back pieces constituting the second core back piece group 1B, respectively. 2f3 is in a state of facing the first core back piece group 1A, and adjacent tooth pieces are connected by a bridge 2g which is a tooth piece connecting member.

  FIG. 3 shows a first core back piece group 1A, a second core back piece group 1B, and a tooth piece group 2A punched from the electromagnetic steel sheet 50. Since a plurality of electromagnetic steel plates 50 are punched with a press device, a plurality of first core back piece groups 1A, second core back piece groups 1B, and tooth piece groups 2A are laminated. Since the plurality of teeth pieces punched from the electromagnetic steel sheet 50 are connected by the bridge 2g, the plurality of teeth pieces are not separated, and not only the handling of the teeth pieces is facilitated but also the connection is originally made. It becomes easy to combine what had been, and the dimensional accuracy as an iron core improves.

  The bridge 2g does not have to be provided in all of the plurality of teeth piece groups 2A to be stacked, and the necessary number may be secured in consideration of the man-hour for cutting the bridge 2g in a subsequent process. The bridge 2g is sufficient to handle the teeth piece group 2A and has a connection strength that can be easily cut in a subsequent process.

  After the bridge 2g is cut, the tooth piece group 2A punched out from the electromagnetic steel sheet 50 has a first tooth piece set 2-1, a second tooth piece set 2-, as shown in FIGS. It is divided into a pair 2-3 of the second and third teeth pieces, and fixed to a jig (not shown), for example. For example, the teeth pieces 2a and 2d constituting the first pair of teeth pieces 2-1 are jigs (not shown) such that the rotor facing surface 2a3 of the teeth piece 2a and the rotor facing surface 2d3 of the teeth piece 2d face each other. The two teeth pieces 2b and 2e constituting the second pair of teeth pieces 2-2 are fixed so that the rotor facing surface 2b3 of the teeth piece 2b and the rotor facing surface 2e3 of the teeth piece 2e face each other. The two teeth pieces 2c, 2f fixed to the jig and constituting the third pair of teeth pieces 2-3 include a rotor facing surface 2c3 of the teeth piece 2c and a rotor facing surface 2f3 of the teeth piece 2f. It is fixed to the jig so as to face each other.

  Next, the insulating winding frames 4a and 4d shown in FIG. 7 are provided on the teeth pieces 2a and 2d constituting the first pair of teeth pieces 2-1 fixed to the jig. The insulating winding frame 4a is a resin insulating material for insulating the winding 5a and the tooth piece 2a shown in FIG. 10, and the insulating winding frame 4d is a resin insulating material for insulating the winding 5d and the tooth piece 2d. Insulating material. The insulating winding frame 4a and the insulating winding frame 4d are connected by an annular connecting member 6ad, and a set of two separators 4s that insulate between adjacent windings is fixed to the connecting member 6ad. Thereby, the 1st cyclic | annular insulation tooth pair 30 is obtained.

  Insulated winding frames 4b and 4e shown in FIG. 8 are provided on the teeth pieces 2b and 2e constituting the second pair of teeth pieces 2-2 fixed to the jig. The insulating winding frame 4b is a resin insulating material for insulating the winding 5b and the tooth piece 2b shown in FIG. 11, and the insulating winding frame 4e insulates the winding 5e and the tooth piece 2e shown in FIG. This is an insulating material made of resin. The insulating winding frame 4b and the insulating winding frame 4e are connected by an annular connecting member 6be, and a set of two separators 4s that insulate between adjacent windings is fixed to the connecting member 6be. As a result, a second annular insulating tooth pair 31 is obtained.

  Insulating winding frames 4c and 4f shown in FIG. 9 are provided on the teeth pieces 2c and 2f constituting the third set of teeth pieces 2-3 fixed to the jig. The insulating winding frame 4c is a resin insulating material for insulating the winding 5c and the tooth piece 2c shown in FIG. 12, and the insulating winding frame 4f insulates the winding 5f and the tooth piece 2f shown in FIG. This is an insulating material made of resin. The insulating winding frame 4c and the insulating winding frame 4f are connected by an annular connecting member 6cf, and a set of two separators 4s that insulate between adjacent windings is fixed to the connecting member 6cf. A third annular insulating tooth pair 32 is obtained.

  In the first embodiment, the resin-made insulating reels 4a to 4f are used, but the material of the insulating reels 4a to 4f is not limited to resin.

  Next, the first annular insulating tooth pair 30 is wound with the windings 5a and 5d shown in FIG. 10, and the second annular insulating tooth pair 31 is wound with the windings 5b and 5e shown in FIG. Winding 5c and 5f shown in FIG. 12 are wound around the pair of annular insulating teeth 32. For example, when a set of teeth pieces 2a and 2d constitutes a U phase, a set of teeth pieces 2b and 2e constitutes a V phase, and a set of teeth pieces 2c and 2f constitutes a W phase, each set is applied to each set. The connection work can be omitted by connecting the two windings with a crossover. Also, as shown in FIG. 16, in the case of 12 stator teeth, 10 rotors not shown, and three-phase, three sets of annular insulation with four teeth arranged in a cross. The teeth are divided into teeth and winding is applied to each of the teeth. In this case, two different phases of winding are applied to the same annular insulating pair of teeth, so that the windings are connected with a jumper. I can't. In this case, the winding is not loosened by winding the winding start portion and the winding end portion of the winding on the unillustrated curled pin provided on the insulating winding frame. In this way, the plurality of teeth pieces 2a to 2f are separated from the core back pieces 1a to 1f shown in FIG. 2, and each is housed in an insulating reel in a state where adjacent teeth pieces are separated from each other. Therefore, adjacent tooth pieces can be wound in a short time and orderly with high density without obstructing the track of the magnet wire existing from the winding machine (not shown) to the insulating reel.

  Next, the first annular insulating tooth pair 30, the second annular insulating tooth pair 31, and the third annular insulating tooth pair 32, which are wound, are combined as shown in FIG. Is obtained.

  In parallel with the manufacture of the annular insulating tooth portion 3, the annular core back 1 shown in FIG. 14 is manufactured. The core back 1 connects one end of the first core back piece group punched from the electromagnetic steel sheet 50 to the end of the second core back piece group at a position facing one end of the first core back piece group. The other end of the first core back piece group punched from the electromagnetic steel sheet 50 is connected to the end of the second core back piece group at a position opposite to the other end of the first core back piece group. Is done. Specifically, after fitting the fitting portion 1dc into the concave portion 1cd, each core back piece is bent so that the concave surface of each core back piece is opposed to each other with a thin joint portion between adjacent core back pieces as a seam, An annular core back 1 is obtained by fitting the fitting portion 1af into the recess 1fa. The concave portion 1cd punched from the area on the right side of the paper surface of the electromagnetic steel plate 50 shown in FIG. 2 is connected to the fitting portion 1dc existing in the area near the concave portion 1cd, and the concave portion punched from the area on the left side of the paper surface of the electromagnetic steel sheet 50. 1fa is coupled to a fitting portion 1af that exists in a region near the recess 1fa. Even if the thickness of the electromagnetic steel sheet 50 is different between the area on the right side and the area on the left side of the drawing, the thickness of the recess 1cd is the same as the thickness of the fitting portion 1dc, and the thickness of the recess 1fa is the fit. It is the same as the plate thickness of the part 1af. Here, when the plate thickness of the concave portion 1cd is different from the plate thickness of the fitting portion 1dc, or the plate thickness of the concave portion 1fa is different from the plate thickness of the fitting portion 1af, the adjacent cores when the core backs 1 are stacked. In the gap between the backs 1, for example, a recess 1 fa constituting one of the core backs 1 enters, which may cause a problem that the dimensional accuracy in the stacking direction is deteriorated or the fitting strength of the core backs 1 is weakened. . In the present embodiment, since the first core back piece group 1A and the second core back piece group 1B arranged as shown in FIG. 2 are punched from the electromagnetic steel sheet 50, the thickness of the recess 1cd is set to the fitting portion 1dc. The thickness of the recess 1fa is the same as the thickness of the fitting portion 1af. Therefore, the occurrence of the above problem can be prevented. FIG. 14 illustrates an example in which the annular core back 1 is configured using two core back piece groups. However, the number of core back piece groups is not limited to two, and three or more core back pieces. The same effect as described above can be obtained also when the annular core back 1 is configured using groups. In particular, if the core back piece group is divided into even numbers, the thicknesses of all the fitting portions can be made uniform.

  Thereafter, as shown in FIG. 15, the contact portion 6ab of the core back pieces 1a, 1b, the contact portion 6bc of the core back pieces 1b, 1c, the contact portion 6cd of the core back pieces 1c, 1d, and the core back piece Welding is applied to the contact portions 6de of 1d and 1e, the contact portions 6ef of the core back pieces 1e and 1f, and the contact portions 6fa of the core back pieces 1f and 1a. A portion indicated by a round dot in the figure is a welded portion. The contact portions 6ab to 6fa are portions where the adjacent core back pieces contact each other when the first core back piece group 1A and the second core back piece group 1B shown in FIG. 3 are bent and fitted together. is there. Thus, since the core back 1 is manufactured separately from the group of teeth, the portion where the adjacent core backs are in contact with each other without being blocked by the insulating winding frame, the teeth, or the winding is the diameter of the core back 1. It is possible to weld from the inner side surface in the direction, and the rigidity of the core back 1 constituted by the plurality of core back pieces 1a to 1f is improved. When the core back 1 shown in FIG. 1 is manufactured by stacking a plurality of core backs 1, if the welding is performed not only between the contact portions 6 ab to 6 fa but also between the adjacent core backs 1, the rigidity is further improved. .

  Note that the welding shown in FIG. 15 may be performed when rigidity is insufficient when the core back 1 is configured without performing welding. For example, when the entire stator is finally molded with resin, when press-fitted into a highly rigid frame, or when fixed with shrink fitting, the core back 1 is unlikely to have insufficient rigidity, so that welding can be omitted.

  Finally, the annular insulating teeth portion 3 shown in FIG. 13 is press-fitted, shrink-fitted, or cold-fitted into the core back 1 shown in FIG. 15 to obtain the stator 100 shown in FIG. In shrink fitting, the core back 1 is fitted in a state higher than room temperature, and in cold fitting, the annular insulating teeth portion 3 is fitted in a state lower than normal temperature. Thus, when the annular insulating teeth portion 3 is fitted into the core back 1 by press-fitting, shrink fitting, or cold fitting, the combination of the teeth pieces and the core back pieces that have been fitted at the time of punching is facilitated, and the stator The dimensional accuracy of the iron core can be improved.

  As described above, the stator 100 of the electric motor according to Embodiment 1 includes a core back and a plurality of teeth, and each end of each of the plurality of teeth pieces is provided on each concave surface of the plurality of core back pieces. A groove portion having a shape to be fitted is formed. With this configuration, the core back piece can be collected from the electromagnetic steel sheet with a high yield as compared to the case of punching the annular core back piece from the electromagnetic steel sheet as in the prior art. In addition, since the conventional yoke has a structure in which the end portion of the tooth is sandwiched by a recessed portion provided in a thin portion that connects adjacent core pieces, the thin portion has a stress that grips the tooth in addition to the stress at the time of bending. Withstand radial thickness. Therefore, the yoke after the thin wall portion is bent and formed into an annular shape has a problem in that the roundness on the outer peripheral side is deteriorated. In addition, since the conventional yoke has a structure in which the teeth end is sandwiched between the concave portions provided in the thin-walled portion, the connecting portion between adjacent core pieces cannot be reinforced by welding, and the rigidity of the connecting portion decreases due to the rigidity of the connecting portion being reduced. It was difficult to ensure the roundness of. In the stator 100 for the electric motor according to the first embodiment, since the end portions of the plurality of teeth pieces are fitted into the concave surfaces of the plurality of core back pieces, the thickness in the radial direction of the thin connecting portion is reduced to that of the conventional thin wall. Since it can be made thinner than the portion, and the connecting portion between the adjacent core pieces can be welded, the roundness of the outer periphery of the yoke is improved. In addition, since the tooth piece and the core back piece are separated and each adjacent tooth piece is separated from each other and stored in an insulating winding frame, winding of the teeth is facilitated, and the winding can be performed in a short time. Can be applied at high density. Further, in the stator 100 of the present embodiment, since the yield of the material is improved, the electromagnetic steel sheet 50 can be used without waste, and the volume of the electromagnetic steel sheet 50 can be reduced in the manufacturing stage and the electromagnetic steel sheet 50 can be reduced. Since the exchange process is reduced, it is preferable from the viewpoint of LCA (Life Cycle Assessment).

Embodiment 2. FIG.
FIG. 17 is a first diagram showing a first core back piece group constituting the stator of the electric motor according to the second embodiment of the present invention, and FIG. 18 shows the stator of the electric motor according to the second embodiment of the present invention. The 2nd figure which shows the 2nd core back piece group to comprise, FIG. 19 is a figure which shows the state which laminated | stacked multiple sheets which bent the core back piece group shown in FIG.17 and FIG.18.

  17 corresponds to the first core back piece group 1A or the second core back piece group 1B shown in FIG. 2, and FIG. 17 shows the first core back piece group 1-1. The surrounding structure of thin-walled connecting portions 1ab, 1bc, 1de, and 1ef that connect adjacent core back pieces among the plurality of core back pieces constituting the piece group 1-1 is shown. In the first core back piece group 1-1, among the plurality of core back pieces constituting the first core back piece group 1-1, an end portion of one core back piece and the other of the adjacent core back pieces are arranged. The end portions of the core back pieces are different in shape from each other, and the end portions 1a2, 1b2, 1c2, 1d2, 1e2, and 1f2 of the other core back pieces are protruded toward one core back piece. And in the 1st core back piece group 1-1, it is a convex surface from the concave surface of a core back piece to the area | region enclosed by thin connection part 1ab, 1bc, 1de, 1ef, one core back piece, and the other core back piece. V-shaped notches 12ab1, 12bc1, 12de1, and 12ef1 that are widened toward the end are provided. The notches 12ab1, 12bc1, 12de1, 12ef1 correspond to the notches 12ab, 12bc, 12de, 12ef shown in FIG. However, the notches 12ab1 to 12ef1 shown in FIG. 17 have a V-shape that is asymmetric with respect to the line segment A that passes through the thin-walled connecting portions 1ab to 1ef and is orthogonal to the longitudinal direction of the first core back piece group 1-1. is there.

  The second core back piece group 1-2 shown in FIG. 18 is similar to the first core back piece group 1-1 in the first core back piece group 1A or the second core back piece group 1B shown in FIG. It corresponds to. In the second core back piece group 1-2, as in the first core back piece group 1-1, the end of one core back piece and the end of the other core back piece of the adjacent core back pieces are Each shape is different. However, in the second core back piece group 1-2, the end portions 1a3, 1b3, 1c3, 1d3, 1e3, and 1f3 of one core back piece have a shape protruding toward the other core back piece. That is, the notches 12ab2, 12bc2, 12de2, and 12ef2 are V-shaped asymmetrical with respect to the line segment A that passes through the thin-walled connecting portions 1ab to 1ef and is orthogonal to the longitudinal direction of the second core back piece group 1-2. In other words, the left region and the right region are reversed with respect to the line segment A of the notches 12ab1, 12bc1, 12de1, and 12ef1 in FIG.

  The first core back piece group 1-1 shown in FIG. 17 is bent from the thin connection portion 1ab to 1ef and formed into an annular shape, and the second core back piece group 1-2 shown in FIG. 18 is formed from the thin connection portion 1ab. As shown in FIG. 19, the overlapping portions 14 of the end portions 1a2 to 1d2 and the end portions 1a3 to 1d3 are formed on the adjacent annular core backs by alternately laminating the ones that are bent at 1ef and formed in an annular shape. it can.

  In the core back 1 shown in FIG. 15, magnetic flux flows between the thin-walled connecting portions 1ab, 1bc, 1de, 1ef and the contact portions 6ab, 6bc, 6de, 6ef between the adjacent core back pieces. However, the thin-walled connecting portions 1ab, 1bc, 1de, and 1ef have a magnetostrictive effect due to internal stress caused by cutting or bending by pressing, and the magnetic permeability is lowered. Further, the magnetic permeability of the contact portions 6ab, 6bc, 6de, and 6ef is lowered by cutting the end faces. For this reason, the thin connecting portion and the abutting portion have a large magnetic resistance. In contrast, in the second embodiment, when a magnetic flux flows from one core back piece to the other core back piece between adjacent core back pieces, the magnetic flux flowing from one core back piece is shown in FIG. After flowing in the vertical direction of the paper surface at the overlapping portion 14, it flows to the other core back piece. As described above, according to the second embodiment, it is possible to flow a magnetic flux while avoiding a portion where the magnetic permeability is reduced by cutting, and it is possible to reduce the magnetic resistance between adjacent core back pieces. Improvements can be made.

Embodiment 3 FIG.
FIG. 20 is a first view showing a core back piece group constituting the stator of the electric motor according to Embodiment 3 of the present invention, and FIG. 21 is a core constituting the stator of the electric motor according to Embodiment 3 of the present invention. The 2nd figure which shows a back piece group, FIG. 22 is a figure which shows the state which laminated | stacked several core back piece groups shown in FIG. 20 and FIG.

  20 corresponds to the first core back piece group 1A or the second core back piece group 1B shown in FIG. 2, and FIG. 20 shows the first core back piece group 1-3. Three adjacent core back pieces 7a1, 7b1, and 7c1 are shown among the plurality of core back pieces constituting the piece group 1-3. At the left end of the core back piece 7b1 arranged at the center of the first core back piece group 1-3, it is formed at the right end of the core back piece 7a1 arranged on the left side of the first core back piece group 1-3. A curved concave end portion 10b similar to the curved convex end portion 10d is formed. At the right end of the core back piece 7b1, a curved convex end portion 10d similar to the curved concave end portion 10b formed at the left end of the core back piece 7c1 disposed on the right side of the first core back piece group 1-3. Is formed.

  The second core back piece group 1-4 shown in FIG. 21 is similar to the first core back piece group 1-3 in the first core back piece group 1A or the second core back piece group 1B shown in FIG. FIG. 21 shows three adjacent core back pieces 7a2, 7b2, 7c2 among the plurality of core back pieces constituting the second core back piece group 1-4. Differences from the first core back piece group 1-3 are as follows. A curved convex end portion 10d similar to the curved concave end portion 10b formed at the right end of the core back piece 7a2 is formed at the left end of the core back piece 7b2, and the core back piece 7b2 has a curved convex end portion 10d at the right end thereof. A curved concave end portion 10b similar to the curved convex end portion 10d formed at the left end is formed.

  Of the plurality of core back pieces constituting the first core back piece group 1-3, the ends of the adjacent core back pieces 7a1 and 7b1 are fitted, and the ends of the adjacent core back pieces 7b1 and 7c1 are fitted. Each part is fitted. Further, among the plurality of core back pieces constituting the second core back piece group 1-4, the end portions of the adjacent core back pieces 7a2 and 7b2 are respectively fitted, and the end portions of the adjacent core back pieces 7b2 and 7c2 are fitted. Are fitted together. FIG. 22 shows a state in which the first core back piece group 1-3 and the second core back piece group 1-4 configured as described above are alternately stacked in the vertical direction of the paper surface. A pin 9 is inserted into the hole 8 formed in each of the first core back piece group 1-3 and the second core back piece group 1-4. As a result, an overlapping portion 15 is formed between the first core back piece group 1-3 and the second core back piece group 1-4. The pin 9 may be a member punched out when the hole 8 is formed in the electromagnetic steel sheet 50 shown in FIG.

  With such a structure, each core back piece can be bent around the pin 9. Further, the magnetic flux flowing between the adjacent core back pieces can be passed through the overlapping portion 15. That is, when a magnetic flux flows from one core back piece to the other core back piece between adjacent core back pieces, the magnetic flux flowing from one core back piece is overlapped in the vertical direction of the page by the overlapping portion 15 and the pin 9. After flowing, it flows to the other core back piece. As described above, according to the third embodiment, it is possible to flow the magnetic flux while avoiding the portion where the permeability is reduced by cutting, and to reduce the magnetic resistance between the adjacent core back pieces. Improvements can be made. Further, the core back piece group according to the third embodiment does not use the thin-walled connecting portion as in the second embodiment, and thus can have a more robust structure than the second embodiment.

Embodiment 4 FIG.
FIG. 23 is a first layout view when a core back piece group constituting a stator of an electric motor according to Embodiment 4 of the present invention is punched out from an electromagnetic steel sheet, and FIG. 24 is an electric motor according to Embodiment 4 of the present invention. FIG. 25 is a second layout diagram when punching out the core back piece group constituting the stator from the electromagnetic steel sheet, and FIG. 25 is when punching out the tooth piece group constituting the stator of the electric motor according to Embodiment 4 of the present invention from the electromagnetic steel sheet. FIG.

  In the electromagnetic steel sheet 50 of FIG. 23, for example, there are four core back pieces 1-5 including six core back pieces arranged in series, and a plurality of core back pieces constituting the core back pieces 1-5. The curvature of each concave surface is different from the curvature of the projection surface. On the other hand, in the electromagnetic steel sheet 50 of FIG. 24, there are four core back piece groups 1-6 configured by a plurality of core back pieces having the same curvature on the concave surface and the curvature on the projection surface. By making the curvature of the concave surface and the curvature of the projecting surface the same, the gap between the adjacent core back piece groups 1-6 becomes narrower than the gap between the adjacent core back piece groups 1-5, The yield of the material for producing the core back piece is further improved.

  In the electromagnetic steel sheet 50 shown in FIG. 25, each of the six teeth pieces constituting the tooth piece group 2A-1 is in a state of facing each of the six tooth pieces constituting the adjacent tooth piece group 2A-1. Thereby, the clearance gap between adjacent teeth piece group 2A-1 becomes narrower than the clearance gap between teeth piece groups 2A shown in FIG. Therefore, in the fourth embodiment, the yield of the material for manufacturing the tooth piece is improved as compared with the first embodiment.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 Core back, 1a, 1b, 1c, 1d, 1e, 1f Core back piece, 1a1 groove, 1a11 opening, 1a12 bottom, 1a2, 1a3 end, 1b1 groove, 1b11 opening, 1b12 bottom, 1b2, 1b3 end 1c1 groove, 1c11 opening, 1c12 bottom, 1c2, 1c3 edge, 1d1 groove, 1d11 opening, 1d12 bottom, 1d2, 1d3 edge, 1e1 groove, 1e11 opening, 1e12 bottom, 1e2, 1e3 edge, 1f1 Groove portion, 1f11 opening portion, 1f12 bottom portion, 1f2, 1f3 end portion, 1ab, 1bc, 1cd, 1dc, 1de, 1ef, 1fa thin connection portion, 1af, 1dc fitting portion, 1cd, 1fa recess portion, 1A first core back Piece group, 1B second core back piece group, 1-1, 1-3 first core back Piece group, 1-2, 1-4 second core back piece group, 1-5, 1-6 core back piece group, 2 teeth, 2a teeth piece, 2a1 fitting part, 2a2 winding part, 2a3 rotor Opposing surface, 2a4 tip portion, 2b teeth piece, 2b1 fitting portion, 2b2 winding portion, 2b3 rotor facing surface, 2b4 tip portion, 2c teeth piece, 2c1 fitting portion, 2c2 winding portion, 2c3 rotor facing surface 2c4 tip portion, 2d teeth piece, 2d1 fitting portion, 2d2 winding portion, 2d3 rotor facing surface, 2d4 tip portion, 2e teeth piece, 2e1 fitting portion, 2e2 winding portion, 2e3 rotor facing surface, 2e4 Tip part, 2f teeth piece, 2f1 fitting part, 2f2 winding part, 2f3 rotor facing surface, 2f4 tip part, 2g bridge, 2A, 2A-1 teeth piece group, 2-1 of the first teeth piece 2-2 Set of second teeth pieces, 2-3 Set of third teeth pieces, 3 Annular insulating teeth, 4a, 4b, 4c, 4d, 4e, 4f Insulating winding frame, 4s separator, 5a, 5b , 5c, 5d, 5e, 5f Winding, 6ad, 6be, 6cf Connecting member, 6ab, 6bc, 6cd, 6de, 6ef, 6fa Abutting part, 7a1, 7b1, 7c1, 7a2, 7b2, 7c2 Core back piece, 8 Hole, 9 pin, 10b curved concave end, 10d curved convex end, 12ab, 12bc, 12de, 12ef notch, 12ab1, 12bc1, 12de1, 12ef1, 12ab2, 12bc2, 12de2, 12ef2 notch, 14, 15 Overlap part, 30 1st cyclic | annular insulation tooth pair, 31 2nd cyclic | annular insulation tooth pair, 32 3rd cyclic | annular insulation tooth pair , 50 Magnetic steel sheet, 100 Stator.

Claims (4)

A core back formed by laminating a plurality of strip-shaped core back pieces formed by connecting a plurality of arc-shaped core back pieces;
A plurality of teeth formed by laminating a plurality of teeth pieces, arranged radially inside the core back piece group formed in an annular shape and extending toward the center of the core back,
With
On each concave surface of the plurality of core back pieces, a groove portion having a shape in which each end portion of the plurality of teeth pieces is fitted, is formed.
Of the plurality of core back pieces constituting the core back piece group formed in an annular shape, welding is performed from a radially inner side surface of the core back piece to a portion where the adjacent core back pieces are in contact with each other. Electric motor stator. A core back formed by laminating a plurality of strip-shaped core back pieces formed by connecting a plurality of arc-shaped core back pieces;
A plurality of teeth formed by laminating a plurality of teeth pieces, arranged radially inside the core back piece group formed in an annular shape and extending toward the center of the core back,
With
On each concave surface of the plurality of core back pieces, a groove portion having a shape in which each end portion of the plurality of teeth pieces is fitted, is formed.
Of the plurality of core back piece groups constituting the core back formed in an annular shape, welding is performed from a radially inner side surface of the core back piece group to a portion where the adjacent core back piece group contacts. Electric motor stator. In each concave surface of the plurality of core back pieces, a groove portion having a divergent shape is formed from the concave surface of each of the plurality of core back pieces toward the projecting surface,
The stator of the electric motor according to claim 1, wherein the plurality of teeth pieces are formed with fitting portions each having a shape that fits into the groove portion.   2. The plurality of core back pieces, wherein the curvature of the concave surface of each of the plurality of core back pieces is the same as the curvature of each protruding surface of the plurality of core back pieces. The stator of the electric motor according to 2.

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