JP2018174644A - Armature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature capable of certainly fixing a magnetic wedge member while securing quality of the same.SOLUTION: A stator 1 (an armature) includes: a plurality of slots 11; a stator core 10 including teeth 12 arranged between adjacent slots 11; a coil 30 arranged in the slot 11; and a magnetic wedge member 40 in which a plurality of annular magnetic steel sheets 40a are laminated to be integrally formed into a cylindrical shape and that is arranged at an opening side 11a of the slot 11 relative to the coil 30 when viewed from a rotation axis line direction. The magnetic wedge member 40 includes: a first section 41 located on a radial direction extended line L1 of the teeth 12 when being viewed from a rotation axis line direction; and a second section 42 that is located on a radial direction extended line L2 of the slot 11 and through which a magnetic flux hardly passes more than through the first section 41.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an armature.

  Conventionally, an armature is known (see, for example, Patent Document 1).

  Patent Document 1 discloses an armature including an armature core (stator core) including a plurality of slots and a coil wound around the slots. In this armature, a magnetic wedge member unit is provided in the opening region of the slot so as to confine the coil in the slot. The magnetic wedge member unit includes a plurality of rod-shaped magnetic wedge members that extend along the rotation axis direction and are disposed in the opening region of the slot. The magnetic wedge member unit includes a first annular frame that connects (links) one end of the plurality of magnetic wedge members in the rotation axis direction, and a second annular frame that connects (links) the other end. The first annular frame and the second annular frame are formed separately from the plurality of magnetic wedge members. The plurality of magnetic wedge members are also formed separately from each other. The magnetic wedge member is formed by hardening magnetic powder with resin. The first annular frame and the second annular frame may be formed of the same material as the magnetic wedge member or may be formed of different materials. The magnetic wedge member has a magnetic permeability higher than that of air and a higher electric resistance than that of a coil (laminated steel plate).

  The magnetic wedge member is disposed in the opening area of the slot in which the coil is accommodated. Thereby, the magnetic flux (leakage magnetic flux) which penetrates into the coil from the rotor core is blocked by the magnetic wedge member having high electric resistance (magnetic resistance). In addition, since the magnetic wedge member having a higher magnetic permeability than air is disposed in the opening area of the slot, the magnitude of the magnetic flux in the slot opening and the magnetic flux in the teeth are compared with the case where the magnetic wedge member is not disposed. The difference with the size of is reduced. That is, the magnitude of the magnetic flux does not change abruptly at the boundary between the portion at the opening of the slot and the tooth. This reduces slot harmonics (due to sudden changes in the magnitude of the magnetic flux) due to the slots.

JP 2010-166708 A

  However, in the armature disclosed in Patent Document 1, a plurality of magnetic wedge members formed separately are connected to a first annular frame and a second annular frame formed separately from the magnetic wedge members. A magnetic wedge member unit is configured. Therefore, when the electromagnetic force from the rotor acts on the magnetic wedge member unit (magnetic wedge member, first annular frame, second annular frame), the magnetic wedge member, the first annular frame, and the second It is considered that the connection with the annular frame may be released (or the connection portion may be loosened). In addition, since the magnetic wedge member is formed by hardening magnetic powder with resin, different types (multiple types) of materials are required, and measures such as ensuring uniformity of mixing of different types of materials are required. Become.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to securely fix the magnetic wedge member while ensuring the quality of the magnetic wedge member. Is to provide armature.

  In order to achieve the above object, an armature according to one aspect of the present invention includes an armature core including a plurality of slots, teeth disposed between adjacent slots, a coil disposed in the slot, A plurality of annular electromagnetic steel plates are laminated and integrally formed into a cylindrical shape, and a magnetic wedge member is disposed on the opening side of the slot with respect to the coil when viewed from the direction of the rotation axis. The wedge member includes a first portion located on the radial extension line of the teeth and a second portion located on the radial extension line of the slot and less likely to pass the magnetic flux than the first portion when viewed from the rotation axis direction. . The radial extension line of the teeth (slots) means a tip (line) obtained by extending the teeth (slots) along the radial direction.

  In the armature according to one aspect of the present invention, as described above, the magnetic wedge member is integrally formed in a cylindrical shape by laminating a plurality of annular electromagnetic steel plates, and viewed from the rotational axis direction, It arrange | positions with respect to a coil at the opening part side of a slot. As a result, when an electromagnetic force is applied to the cylindrical magnetic wedge member so as to be pulled to the rotor core side, the side opposite to the portion of the magnetic wedge member pulled to the rotor core side (the side opposite to the rotation center of the rotor core) The magnetic wedge member is in contact with the armature core portion (tooth). That is, the movement of the cylindrical magnetic wedge member is restricted by the teeth. Thereby, it is possible to prevent the magnetic wedge member from falling off in the radial direction. In addition, since the magnetic wedge member is formed by laminating a plurality of annular electromagnetic steel plates and integrally forming a cylindrical shape, the magnetic wedge member is formed by one member (material) called an electromagnetic steel plate. Unlike the case where the magnetic wedge member is formed by mixing different materials such as powder and resin, the quality (uniformity) of the magnetic wedge member can be ensured. As a result, the magnetic wedge member can be securely fixed while ensuring the quality of the magnetic wedge member.

  Further, by forming the magnetic wedge member with one type of member (material) called an electromagnetic steel plate, it is possible to prevent the number of types of members (materials) from increasing.

  According to the present invention, as described above, the magnetic wedge member can be reliably fixed while ensuring the quality of the magnetic wedge member.

1 is a plan view of a stator according to a first embodiment of the present invention. It is a top view of the magnetic wedge member by 1st Embodiment of this invention. It is the elements on larger scale of FIG. It is sectional drawing of the magnetic wedge member by 1st Embodiment of this invention. It is a perspective view of the magnetic wedge member by 1st Embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the magnetic wedge member by 1st Embodiment of this invention. It is a top view of the stator by 2nd Embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the magnetic wedge member by 2nd Embodiment of this invention. It is a top view of the stator by 3rd Embodiment of this invention. It is a figure for demonstrating the double picking of the magnetic wedge member by 3rd Embodiment of this invention. It is a top view of the stator by the 1st modification of the 1st-3rd embodiment of this invention. It is a top view of the stator by the 2nd modification of the 1st-3rd embodiment of this invention. It is a top view of the stator by the 3rd modification of 1st-3rd embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the magnetic wedge member by the modification of 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Structure of stator)
With reference to FIGS. 1-5, the structure of the stator 1 by 1st Embodiment is demonstrated. The stator 1 is an example of the “armature” in the claims.

  In the present specification, the “rotation axis direction” means a direction (direction A, see FIG. 1) along the center axis of the stator core 10 (rotation axis of the rotor core 20) in a state completed as the stator 1. Further, the “circumferential direction” means the circumferential direction of the stator core 10 in a state completed as the stator 1 (direction B, see FIG. 1). The “radial direction” means the radial direction of the stator core 10 in a state completed as the stator 1 (C direction, see FIG. 1). The “inner diameter side” means a direction toward the center of the stator core 10 in a state completed as the stator 1 (C1 direction, see FIG. 1). The “outer diameter side” means a direction (C2 direction, see FIG. 1) toward the outside of the stator core 10 in a state completed as the stator 1.

  As shown in FIG. 1, the stator 1 includes a stator core 10. The stator core 10 is disposed so as to face the rotor core 20 provided with a permanent magnet (not shown) in the radial direction. Moreover, the stator core 10 is comprised by the laminated electromagnetic steel plate 10a. The electromagnetic steel sheet 10a is made of silicon steel or the like having a relatively high conversion efficiency between electric energy and magnetic energy. The stator core 10 is an example of an “armature core” in the claims.

  The stator core 10 is provided with a plurality of slots 11. For example, 48 slots 11 are provided. Further, the circumferential width W1 of the stator core 10 of the slot 11 (see FIG. 3) is substantially constant along the radial direction of the stator core 10. That is, the slot 11 has a format called an open slot.

  Further, teeth 12 are provided between adjacent slots 11. The width W2 (see FIG. 3) of the teeth 12 in the circumferential direction of the stator core 10 gradually decreases toward the inner diameter side of the stator core 10. Further, the width W2 of the tooth 12 is larger than the width W1 of the slot 11 at any radial position of the tooth 12.

  A plurality of coils 30 are disposed in the slot 11. The coil 30 is formed by winding a rectangular conductor wire a plurality of times. For example, the coil 30 is formed of a concentric winding coil in which a rectangular conductor wire is concentrically wound. The plurality of coils 30 is formed by moving the plurality of coils 30 from the inner diameter side to the outer diameter side in a state where the coil assembly in which the plurality of coils 30 are annularly arranged (assembled) is disposed on the inner diameter side of the stator core 10. , Inserted into the slot 11. Insulating paper (not shown) is disposed between the slot 11 and the coil 30. The insulating paper is made of a heat-resistant, for example, polyimide or polyamide resin.

  The stator core 10 is provided with a magnetic wedge member 40. The magnetic wedge member 40 has a function of reducing leakage magnetic flux (magnetic flux that does not contribute to the rotational force of the rotor core 20) entering the coil 30 from the rotor core 20. Further, the magnetic wedge member 40 is disposed on the opening 11 a side (inner diameter side, see FIG. 3) of the slot 11 with respect to the coil 30.

  Here, in the first embodiment, as shown in FIGS. 2, 4, and 5, the magnetic wedge member 40 is integrally formed in a cylindrical shape by laminating a plurality of annular electromagnetic steel plates 10a. As shown in FIG. 3, the magnetic wedge member 40 is formed on the first portion 41 located on the radial extension line L <b> 1 of the tooth 12 and the radial extension line L <b> 2 of the slot 11 when viewed from the rotational axis direction. And a second portion 42 that is located and is less likely to pass magnetic flux than the first portion 41. In addition, "annular" means a state (annular) in which a substantially circular opening is provided at the center and is connected 360 degrees. Further, “integral” means that the plurality of electromagnetic steel plates 10a are fixed to each other by caulking, welding, or the like. Further, “cylindrical” means that a magnetic steel sheet 40a having a substantially circular opening at the center is laminated and formed into a tubular shape. Moreover, the radial direction extension line L1 of the tooth 12 means the tip (line) which extended the tooth 12 along the radial direction. The radial extension line L2 of the slot 11 means a point (line) extending the slot 11 along the radial direction.

  Further, the first portion 41 is arranged on the inner diameter side of the tooth 12 so as to be continuous with the tooth 12. Thereby, in 1st Embodiment, the 1st part 41 located on the radial direction extension line L1 of the teeth 12 functions as the teeth 12. FIG. That is, the magnetic flux from the rotor core 20 flows so as to pass through the first portion 41 and the teeth 12.

  In the first embodiment, the second portion 42 is disposed outside the slot 11 when viewed from the rotational axis direction. That is, the second portion 42 is not disposed inside the slot 11 (the portion where the coil 30 is disposed). The second portion 42 is provided so as to cover (close) the opening 11 a on the inner diameter side of the slot 11. Thereby, the flow of leakage magnetic flux from the rotor core 20 can be suppressed by the second portion 42. Further, since the second portion 42 is not a complete non-magnetic material, the magnetic flux flows to some extent. Thereby, since the magnitude | size of magnetic flux does not change abruptly in the part in the opening part 11a of the slot 11, and the teeth 12, it becomes possible to reduce a slot harmonic. As a result, iron loss (eddy current) can be reduced.

  The second portion 42 is provided so as to be continuous with the first portion 41. That is, in the magnetic wedge member 40, the first portion 41 and the second portion 42 are continuously arranged in this order in the circumferential direction of the stator core 10. Then, the first portion 41, the second portion 42, and the boundary portion 43 of the first portion 41 and the second portion 42, which are provided continuously, are opposite to the slot 11 side (inner diameter side). The surface 44 is configured as a continuous surface 44 with no step. That is, the magnetic wedge member 40 is formed by laminating a plurality of electromagnetic steel plates 40 a having a substantially circular opening at the center along the rotational axis direction so that no step is generated on the surface 44.

  Moreover, in 1st Embodiment, the stator core 10 is comprised by the laminated | stacked electromagnetic steel plate 10a. The magnetic wedge member 40 is composed of laminated electromagnetic steel plates 40 a made of the same material as the stator core 10. That is, the electromagnetic steel sheet 10a for the stator core 10 and the electromagnetic steel sheet 40a for the magnetic wedge member 40 are formed by punching one strip-shaped electromagnetic steel sheet (not shown). A method for manufacturing the stator core 10 and the magnetic wedge member 40 will be described later.

  In the first embodiment, the magnetic wedge member 40 includes a convex portion 45 that engages with the tooth 12. Further, the tooth 12 includes a concave portion 13 that engages with the convex portion 45. The convex portion 45 and the concave portion 13 are formed in a shape that prevents the magnetic wedge member 40 from falling off in the radial direction of the stator core 10 when engaged with each other. Specifically, the magnetic wedge member 40 includes a substantially trapezoidal convex portion 45 when viewed from the rotational axis direction. The convex portion 45 is configured to protrude to the outer diameter side. Further, the recess 13 has a substantially trapezoidal shape when viewed from the rotation axis direction. The recess 13 is configured to be recessed (depressed) on the outer diameter side. The convex portion 45 and the concave portion 13 are examples of the “first engaging portion” and the “second engaging portion” in the claims, respectively.

  And in 1st Embodiment, the convex part 45 contains the shape (part 45a) caught on the recessed part 13, and the recessed part 13 contains the shape (part 13a) caught on the convex part 45. FIG. Specifically, the convex portion 45 has a substantially trapezoidal shape when viewed from the rotation axis direction. The substantially trapezoidal convex portion 45 is configured such that the circumferential width W3 increases toward the outer diameter side. The substantially trapezoidal recess 13 is configured such that the circumferential width W4 increases toward the outer diameter side. Then, a portion 45 a corresponding to the “leg” of the substantially trapezoidal convex portion 45 (portion connecting the upper base and the lower base) is caught by a portion 13 a corresponding to the “leg” of the substantially trapezoidal concave portion 13. Thereby, the shape (drop-off prevention structure) that prevents the magnetic wedge member 40 from dropping in the radial direction of the stator core 10 is formed. The portion 45a corresponding to the “leg” of the convex portion 45 and the portion 13a corresponding to the “leg” of the concave portion 13 are formed so as to intersect in the radial direction when viewed from the rotational axis direction. Accordingly, the movement of the magnetic wedge member 40 along the radial direction is restricted by the portion 45 a corresponding to the “leg” of the convex portion 45 and the portion 13 a corresponding to the “leg” of the concave portion 13. The portion 13a and the portion 45a are examples of the “hooking portion” in the claims.

  Moreover, the convex part 45 and the recessed part 13 have the trapezoid shape corresponding to each other, and the convex part 45 and the recessed part 13 are comprised so that engagement (fitting) is possible substantially without gap. In addition, when there exists a clearance gap between the convex part 45 and the recessed part 13, the varnish for fixing the coil 30 to the slot 11 flows into this clearance gap, and the shakiness of the magnetic wedge member 40 is suppressed. Further, the same number of protrusions 45 and recesses 13 as the slots 11 (teeth 12) are provided. Further, the convex portions 45 (concave portions 13) are arranged at substantially equal angular intervals in the circumferential direction.

  Moreover, in 1st Embodiment, as shown in FIG. 4, thickness t1 of the part 40b of the electromagnetic steel plate 40a which comprises the 2nd part 42 of the direction along a rotation axis is the 1st part of the direction along the rotation axis. 41 is smaller than the thickness t2 of the portion 40c of the electromagnetic steel sheet 40a constituting the frame 41 (t1 <t2). Specifically, the second portion 42 (the portion 40b of the electromagnetic steel sheet 40a constituting the second portion 42) is pressed (crushed) so that the thickness t1 of the portion 40b is larger than the thickness t2 of the portion 40c. It has been made smaller. As a result, the second portion 42 has a smaller magnetic path cross-sectional area and a residual stress (residual stress), so that the magnetic flux is less likely to pass than the first portion 41.

  Further, since the thickness t1 of the portion 40b of the electromagnetic steel sheet 40a is smaller than the thickness t2 of the portion 40c of the electromagnetic steel sheet 40a, a gap 46 is generated in the vicinity of the portion 40b of the laminated electromagnetic steel sheets 40a. Note that air having a lower magnetic permeability than the electromagnetic steel sheet 40 a exists in the gap 46, so that the magnetic flux hardly passes through the gap 46. This makes it more difficult for the magnetic flux to pass in the vicinity of the second portion 42.

(Method for manufacturing magnetic wedge member (stator))
Next, a method for manufacturing the magnetic wedge member 40 will be described with reference to FIG.

  First, in step S1, a strip-shaped electromagnetic steel sheet (not shown) is punched to form an annular electromagnetic steel sheet 40a. At this time, the convex portion 45 is also formed at the same time.

  Next, in step S2, the second portion 42 of the electromagnetic steel plate 40a (the portion 40b of the electromagnetic steel plate 40a constituting the second portion 42) is pressed (crushed), so that the thickness t1 of the portion 40b becomes a portion. It is made smaller than the thickness t2 of 40c. By this crushing process, the stress (residual stress) applied during the crushing process remains in the second part 42 (part 40b), and the magnetic path cross-sectional area is reduced by the small thickness t1. Thereby, in the 2nd part 42 (part 40b), magnetic flux becomes difficult to pass. That is, the magnetic characteristics of the second portion 42 (portion 40b) deteriorate (modify). The deterioration of magnetic characteristics means that the magnetic permeability is lowered and the saturation magnetic flux density is reduced (magnetic saturation is likely to occur). Note that step S1 (punching) and step S2 (squeezing) may be performed separately or simultaneously. By simultaneously performing step S1 (punching) and step S2 (squeezing), the number of steps can be reduced, so that the time required for manufacturing the magnetic wedge member 40 can be shortened.

  Next, in step S3, the electromagnetic steel sheet 40a is laminated. By repeating the steps S1 to S3, the magnetic wedge member 40 is formed by the plurality of laminated electromagnetic steel plates 40a.

  Similarly, an annular electromagnetic steel sheet 10 a including the teeth 12 and the slots 11 is formed by punching a strip-shaped electromagnetic steel sheet (not shown). And the stator core 10 is formed by laminating | stacking the some electromagnetic steel plate 10a. Then, the magnetic wedge member 40 and the stator core 10 are relatively moved along the rotation axis direction, whereby the convex portion 45 of the magnetic wedge member 40 is engaged (fitted) with the concave portion 13 of the tooth 12. In addition, annealing is performed at a temperature of about 700 ° C. to 750 ° C. with the magnetic wedge member 40 engaged with the stator core 10. Thereby, in the punching process (and the reforming process), the magnetic properties of the portions (the convex portions 45, the concave portions 13 and the like) where the magnetic properties have deteriorated are recovered to some extent. Then, the stator 1 is completed by inserting the coil 30 into the slot 11 from the inner diameter side.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIG. In the second embodiment, the radial width W11 of the electromagnetic steel sheet 140a is configured to be smaller than the width W12.

  In the stator 100, the width W11 of the portion through which the magnetic flux in the radial direction of the stator core 110 passes through the portion 140b of the electromagnetic steel sheet 140a constituting the second portion 142 of the magnetic wedge member 140 when viewed from the rotational axis direction. Is smaller than the width W12 of the portion (portion other than the convex portion) through which the magnetic flux in the radial direction of the stator core 110 of the portion 140c of the electromagnetic steel plate 140a constituting the. The thickness of the portion 140b in the direction along the rotational axis is substantially equal to the thickness of the portion 140c. The stator 100 is an example of the “armature” in the claims. The stator core 110 is an example of the “armature core” in the claims.

(Method for manufacturing magnetic wedge member (armature))
Next, a method for manufacturing the magnetic wedge member 140 will be described with reference to FIG.

  First, in step S11, an annular electromagnetic steel sheet 140a is formed by punching a strip-shaped electromagnetic steel sheet (not shown). At this time, a strip-shaped electromagnetic steel sheet (not shown) is punched out so that the width W11 of the portion 140b constituting the second portion 142 is smaller than the width W12 of the portion 140c constituting the first portion 141.

  Next, in step S12, the electromagnetic steel sheet 140a is laminated. By repeating the steps S1 to S2, the magnetic wedge member 140 is formed by the plurality of laminated electromagnetic steel sheets 140a. In the second embodiment, the electrical steel sheet 140a is not modified (squeezed). Other configurations of the second embodiment are the same as those of the first embodiment.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIGS. 9 and 10. In the third embodiment, the width W21 of the slot 211 is larger than the width W22 of the tooth 212. In FIG. 9, the annular stator core 210 is described in a band shape extending in the left-right direction on the paper surface when viewed from the rotation axis direction. The stator core 210 is an example of the “armature core” in the claims.

  In the stator 200, the width W <b> 21 in the direction along the circumferential direction of the stator core 10 of the slot 211 is larger than the width W <b> 22 in the direction along the circumferential direction of the stator core 210 of the tooth 212 when viewed from the rotational axis direction. Thereby, as shown in FIG. 10, in the strip-shaped electromagnetic steel sheet 250, the area of the portion not punched out as the stator core 210 becomes relatively large, and from this portion, a part of the magnetic wedge member 240 (second portion 242) is made. It becomes possible to form. That is, the stator core 210 and the magnetic wedge member 240 (the first portion 241 and the second portion 242) can be taken together from a single belt-shaped electromagnetic steel plate 250. The stator 200 is an example of the “armature” in the claims.

(Effects of the first to third embodiments)
In the first to third embodiments, the following effects can be obtained.

  In the first to third embodiments, as described above, the magnetic wedge members (40, 140, 240) are integrally formed in a cylindrical shape by laminating a plurality of annular electromagnetic steel plates (40a, 140a). As seen from the direction of the rotation axis, the coil (30) is disposed on the opening (11a) side of the slot (11, 211). Thus, when an electromagnetic force is applied to the cylindrical magnetic wedge member (40, 140, 240) so as to be pulled toward the rotor core (20), the magnetic wedge member (40, 40) pulled toward the rotor core (20) side. 140, 240) (the opposite side to the rotation center of the rotor core (20)) of the magnetic wedge member (40, 140, 240) is the stator core (10, 110, 210) portion (tooth ( 12, 212)). That is, the movement of the cylindrical magnetic wedge members (40, 140, 240) is restricted by the teeth (12, 212). Thereby, it is possible to prevent the magnetic wedge members (40, 140, 240) from falling off in the radial direction. Further, the magnetic wedge member (40, 140, 240) is formed by laminating a plurality of annular electromagnetic steel plates (40a, 140a) and is integrally formed into a cylindrical shape. Since the magnetic wedge member (40, 140, 240) is formed by one member (material), the magnetic wedge member (40, 140, 240) is formed by mixing different materials such as magnetic powder and resin. Unlike the above, the quality (uniformity) of the magnetic wedge members (40, 140, 240) can be ensured. As a result, the magnetic wedge member (40, 140, 240) can be securely fixed while ensuring the quality of the magnetic wedge member (40, 140, 240).

  In addition, by forming the magnetic wedge member (40, 140, 240) from one type of member (material) called the electromagnetic steel plate (40a, 140a), it is possible to prevent the number of types of members (materials) from increasing. it can.

  In the first to third embodiments, as described above, the magnetic wedge member (40, 140, 240) includes the convex portion (45) engaged with the teeth (12, 212), and the teeth (12, 212) includes a concave portion (13) engaged with the convex portion (45), and the magnetic wedge member (40, 140, 240) is formed in the stator core (10, 110, 210) by the convex portion (45) and the concave portion (13). ) Is prevented from falling off in the radial direction. With this configuration, the magnetic wedge members (40, 140, 240) are engaged with the teeth (12, 212) (fixed by mechanical fitting), so that the magnetic wedge members (40, 140, 240) can be further prevented from falling off in the radial direction. That is, the magnetic wedge members (40, 140, 240) can be fixed to the teeth (12, 212) without being joined by welding or the like. Accordingly, it is possible to prevent the magnetic wedge members (40, 140, 240) from falling off due to the welding portion being detached due to the electromagnetic force from the rotor core (20).

  In the first to third embodiments, as described above, at least one of the convex portion (45) and the concave portion (13) is caught by the other of the convex portion (45) and the concave portion (13). Includes shape parts (13a, 45a). If comprised in this way, since a convex part (45) and a recessed part (13) will be mutually caught, it can further prevent that a magnetic wedge member (40,140,240) falls out to radial direction.

  In the first to third embodiments, as described above, the first portions (41, 141, 241) positioned on the radial extension line (L1) of the teeth (12, 212) are the teeth (12, 212). If comprised in this way, the magnetic flux from a rotor core (20) can be easily flowed to the teeth (12, 212) side via a 1st part (41, 141, 241).

  In the first to third embodiments, as described above, the second portion (42, 142, 242) is disposed outside the slot (11, 211) when viewed from the rotation axis direction, and The first part (41, 141, 241), the second part (42, 142, 242) and the second part are provided so as to be continuous with the first part (41, 141, 241). The surface (44) opposite to the slot (11, 211) side of the boundary portion (43) of the first portion (41, 141, 241) and the second portion (42, 142, 242) has no step. It is configured as a continuous surface (44) in the state. With this configuration, when the rotor core (20) is disposed on the inner diameter side of the stator core (10, 110, 210), the rotor core (20) is positioned on the inner diameter side surface (40, 140, 240) of the magnetic wedge member (40, 140, 240). 44) can be prevented from colliding with and being damaged.

  In the first and third embodiments, as described above, the thickness (t1) of the portion (40b) of the electromagnetic steel sheet (40a) constituting the second portion (42, 242) in the direction along the rotation axis is as follows. The thickness (t2) of the portion (40c) of the electromagnetic steel sheet (40a) constituting the first portion (41, 241) in the direction along the rotation axis is smaller. If comprised in this way, since the magnetic path cross-sectional area in a 2nd part (42, 242) will become small, it will pass magnetic flux in the part (40b) of the electromagnetic steel plate (40a) which comprises a 2nd part (42, 242). Can be difficult. Further, by adjusting the ratio between the thickness t2 of the first part (41, 241) and the thickness t1 of the second part (42, 142, 242), the difficulty of passing the magnetic flux can be easily adjusted (desired Magnetic properties). Further, in the state in which the dissimilar metal is in contact with the second part (42, 142, 242), the dissimilar metal is melted with a laser or the like to make the second part (42, 142, 242) non-magnetic metallized. Unlike this, it is easy (with little effort) to make it difficult to pass magnetic flux.

  Further, in the first and third embodiments, as described above, the second portion (42, 242) is configured to be less likely to pass the magnetic flux than the first portion (41, 241) when pressed. Has been. If comprised in this way, since a stress remains as a residual stress in the pressed part, the magnetic characteristic of the pressed part can be deteriorated easily.

  In the second embodiment, as described above, the magnetic flux in the radial direction of the stator core (110) of the part (140b) of the electromagnetic steel sheet (140a) constituting the second part (142) is viewed from the rotational axis direction. The width W11 of the passing part (140b) is smaller than the width W12 of the part through which the radial magnetic flux of the stator core (110) of the part (140c) of the electromagnetic steel sheet (140a) constituting the first part (141) passes. If comprised in this way, since the magnetic path cross-sectional area of a 2nd part (142) will become small, it will be difficult to pass a magnetic flux easily in the part (140b) of the electromagnetic steel plate (140a) which comprises a 2nd part (142). can do. Further, by adjusting the ratio of the width W12 of the first part (141) and the width W11 of the second part (142), the difficulty of passing the magnetic flux can be easily adjusted (to obtain desired magnetic characteristics). Can do.

  In the first to third embodiments, as described above, the stator core (10, 110, 210) is composed of laminated electromagnetic steel plates (10a) and magnetic wedge members (40, 140, 240). ) Is composed of laminated electromagnetic steel plates (40a, 140a) made of the same material as the stator core (10, 110, 210). If comprised in this way, since a magnetic wedge member (40,140,240) is comprised by the electromagnetic steel plate (40a, 140a) which is comparatively easy to procure, a magnetic wedge member (40,140,240) is formed easily. can do.

  In the third embodiment, as described above, the width W21 in the direction along the circumferential direction of the stator core (210) of the slot (211) when viewed from the rotational axis direction is the stator core (210) of the tooth (212). It is larger than the width W22 in the direction along the circumferential direction. If comprised in this way, in the strip | belt-shaped electromagnetic steel plate 250, since the area of the part which is not punched out as a stator core (210) becomes comparatively large, a part of magnetic wedge member (240) can be taken together from this part. it can.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the example in which the coil is formed from a flat wire is shown, but the present invention is not limited to this. For example, the coil may be formed from a round wire or the like.

  Moreover, in the said 1st-3rd embodiment, although the convex part was provided in the magnetic wedge member and the recessed part was provided in the teeth, this invention is not limited to this. For example, like the stator 300 of the first modification shown in FIG. 11, the concave portion 341 a may be provided in the first portion 341 of the magnetic wedge member 340 and the convex portion 312 a may be provided in the tooth 312. The stator 300 is an example of the “armature” in the claims. The concave portion 341a and the convex portion 312a are examples of the “first engagement portion” and the “second engagement portion” in the claims, respectively.

  In the first to third embodiments, the example in which the convex portion of the magnetic wedge member and the concave portion of the tooth are substantially trapezoidal in plan view is shown, but the present invention is not limited thereto. For example, like the stator 400 of the second modified example shown in FIG. 12, the magnetic wedge member 440 is provided with a convex portion 445 that extends in the radial direction and then bends in the circumferential direction when viewed from the rotational axis direction. A recess 413 that is recessed in the circumferential direction may be provided. The stator 400 is an example of the “armature” in the claims. The convex portion 445 and the concave portion 413 are examples of the “first engaging portion” and the “second engaging portion” in the claims, respectively.

  In the first to third embodiments, the example in which the rotor is disposed on the inner diameter side of the stator core is shown, but the present invention is not limited to this. For example, the rotor may be disposed on the outer diameter side of the stator core. Moreover, you may apply the structure of 1st-3rd embodiment to the armature as a rotor.

  Moreover, you may combine the structure of the said 1st Embodiment and the structure of the said 2nd Embodiment. That is, both the thickness in the direction along the rotation axis of the second part (the part of the electrical steel sheet constituting the second part) and the width in the radial direction are both the first part (the part of the electrical steel sheet constituting the first part). ) In the direction along the rotation axis and the width in the radial direction may be smaller.

  Moreover, in the said 2nd Embodiment, the width | variety of the radial direction of the part of the electromagnetic steel plate which comprises a 2nd part becomes smaller than the width | variety of the radial direction of the electromagnetic steel plate which comprises a 1st part seeing from a rotating shaft direction. Although an example is shown, the present invention is not limited to this. For example, a hole 542a may be provided in the second portion 542 of the magnetic wedge member 540 as in the stator 500 of the third modified example shown in FIG. Thereby, the width (W31 + W32) of the portion through which the magnetic flux in the radial direction of the portion of the electromagnetic steel plate 540a constituting the second portion 542 passes is the magnetic flux in the radial direction of the stator core 10 of the portion of the electromagnetic steel plate 540a constituting the first portion 541. It becomes smaller than the width W33 of the portion through which. The stator 500 is an example of the “armature” in the claims.

  Moreover, in the said 1st Embodiment, although the modification process (step S2) was shown after the punching process (step S1), this invention is not limited to this. For example, the punching process (step S22) may be performed after the reforming process (step S21) as in the manufacturing method according to the modification of the first embodiment shown in FIG.

  Further, in the first to third embodiments, the example in which the second portion is less likely to pass the magnetic flux than the first portion by reducing the thickness (width) of the second portion has been shown. Not limited to. For example, the second part may be made harder to pass the magnetic flux than the first part by non-metallizing (modifying) the second part. For example, the electromagnetic wave corresponding to the second part is melted by irradiating a laser in a state where a torch of a different metal such as chromium is in contact with the part of the electromagnetic steel sheet corresponding to the second part. The part of the steel plate is non-magnetic metallized.

  Moreover, in the said 1st-3rd embodiment, although the example which forms a 2nd part by crushing (punching) was shown, this invention is not limited to this. For example, the second portion may be formed by shot blasting. Further, the magnetic characteristics of the second portion may be deteriorated only by pressing without reducing the thickness (width) of the second portion.

1, 100, 200, 300, 400, 500 Stator (armature)
10, 110, 210 Stator core (armature core)
10a Magnetic steel sheet 11, 211 Slot 11a Opening 12, 212, 312, 412 Teeth 13 Recess (second engaging portion)
13a part (hook shape part)
30 Coil 40, 140, 240, 340, 440, 540 Magnetic wedge member 40a, 140a, 540a Electrical steel plate 41, 141, 241, 341, 541 First part 42, 142, 242, 542 Second part 43 Boundary part 44 Surface 45 Convex part (first engaging part)
45a part (hook part)
312a Convex part (second engaging part)
341a Concave portion (first engaging portion)
413 Concave portion (second engaging portion)
445 Convex part (first engaging part)

Claims (10)

An armature core including a plurality of slots and teeth disposed between the adjacent slots;
A coil disposed in the slot;
A plurality of annular electromagnetic steel plates are laminated and integrally formed in a cylindrical shape, and a magnetic wedge member disposed on the opening side of the slot with respect to the coil when viewed from the rotational axis direction. ,
The magnetic wedge member is located on a radial extension line of the teeth and a radial extension line of the slot and is less likely to pass magnetic flux than the first part when viewed from the rotational axis direction. An armature including two parts. The magnetic wedge member includes a first engagement portion that engages with the teeth,
The teeth include a second engagement portion that engages with the first engagement portion,
2. The electric machine according to claim 1, wherein the first engagement portion and the second engagement portion form a drop-off prevention structure that prevents the magnetic wedge member from dropping in a radial direction of the armature core. Child. The first engaging portion includes one of a convex portion and a concave portion,
The second engaging portion includes the other of the convex portion and the concave portion,
The armature according to claim 2, wherein the convex portion and the concave portion are engaged with each other.   4. The armature according to claim 3, wherein at least one of the convex portion and the concave portion includes a hook-shaped portion that is caught by the other of the convex portion and the concave portion.   The armature according to any one of claims 1 to 4, wherein the first portion located on a radial extension line of the teeth functions as the teeth. The second part is disposed outside the slot when viewed from the direction of the rotation axis, and is provided to be continuous with the first part,
The surfaces of the first part, the second part, the boundary part of the first part and the second part, which are provided to be continuous, on the opposite side to the slot side are continuous without a step. The armature according to claim 1, wherein the armature is configured as a finished surface.   The thickness of the part of the electromagnetic steel sheet constituting the second part in the direction along the rotation axis is smaller than the thickness of the part of the electromagnetic steel sheet constituting the first part in the direction along the rotation axis. The armature according to any one of 1 to 6.   The width of the portion through which the magnetic flux in the radial direction of the armature core of the portion of the electromagnetic steel plate constituting the second portion passes as viewed from the rotational axis direction is the width of the portion of the electromagnetic steel plate constituting the first portion. The armature according to any one of claims 1 to 7, which is smaller than a width of a portion through which a magnetic flux in a radial direction of the armature core passes.   The armature core is composed of the laminated electromagnetic steel plates, and the magnetic wedge member is composed of the laminated electromagnetic steel plates made of the same material as the armature core. The armature of any one of -8.   The width in the direction along the circumferential direction of the armature core of the slot is larger than the width in the direction along the circumferential direction of the armature core of the teeth as viewed from the rotation axis direction. The armature according to any one of the above.

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