JP2019213318A - Lamination core and stator core - Google Patents

Abstract

To firmly fasten a lamination core to a block as a fixing object using a fastening member without causing a cracking.SOLUTION: A lamination core comprises: a lamination body formed by laminating a lamination sheet; and reinforcing plates that hold the lamination body therebetween. The lamination sheet is provided with a hole to which a fastening member for fixing the lamination body and the reinforcing plates to a fixing member is inserted, and a groove that divides a region between the hole and a peripheral edge of the lamination sheet in a circumferential direction.SELECTED DRAWING: Figure 1C

Description

  The present disclosure relates to a laminated core and a stator core.

  High performance materials are required for soft magnetic materials used for the stator core of motors. Performances generally required as a high-performance soft magnetic material include low iron loss (loss), high saturation magnetic flux density, high magnetic permeability, and low coercive force. For the stator core of a motor, a soft magnetic material with extremely low iron loss is required.

  Conventionally, an electromagnetic steel sheet is known as a soft magnetic material having a low iron loss and is used as a material for a stator core of various motors. An amorphous alloy ribbon is known as a material exhibiting soft magnetic properties that surpass electromagnetic steel sheets. By using amorphous alloy ribbons as stator cores instead of electromagnetic steel sheets, it is possible to obtain motors with lower loss and higher performance.

  However, when an amorphous alloy ribbon is used, heat treatment needs to be performed in order to obtain higher soft magnetic properties. Even if it is an amorphous crystal structure by this heat processing, it becomes embrittled and has the characteristics that it becomes easy to break.

  In addition, it is known that the amorphous alloy ribbon can be nanocrystallized by performing a predetermined heat treatment. By nanocrystallizing the amorphous alloy ribbon, it is possible to obtain higher soft magnetic properties that could not be obtained with an amorphous crystal structure. However, the amorphous alloy ribbon is further embrittled by being nanocrystallized, and is easily cracked. Therefore, there is a problem that handling becomes more difficult.

  The stator core needs to be fixed in order to function as a motor. There is bolt fastening as the cheapest and easiest method for fixing the stator core. By passing a bolt through a bolt fastening hole provided in the stator core and bolting the mounting block, the stator core can be fixed to the mounting block easily and inexpensively.

  However, when the stator core is fastened with bolts, it is necessary to fix the stator core with a high tightening torque so that the external force is applied to the stator core and no deviation occurs between the laminates.

  As a countermeasure against the above-described conventional problems, a method of laser welding a laminated body of sheet steel plates has been employed (see, for example, Patent Document 1). By laser welding the laminate, certain effects such as prevention of layer displacement of the laminate can be obtained.

  5A and 5B are diagrams illustrating an example of a soft magnetic core similar to the conventional soft magnetic core described in Patent Document 1. FIG. FIG. 5A is a front view of a stator, and FIG. 5B is a top view of a magnetic steel sheet forming a laminate. Note that the winding is omitted for simplification.

  The electromagnetic steel plate 101 has a fastening hole 102 for bolt fastening. The electromagnetic steel plate 101 is fixed to the block 106 with fastening bolts 105. In addition, the electromagnetic steel sheet 101 has a notch 103 processed, and a welded portion 104 is provided by welding a part of the notch 103.

  Since the laminated steel sheets 101 are partially fixed by the welded portion 104 and are integrated, it is easy to handle.

JP 2001-57747 A

  In patent document 1, the laminated steel plates are welded to each other so that they can be handled as an integrated object. In the generally used electromagnetic steel sheet, the thickness is about 0.2 to 0.4 mm. Moreover, even if the temperature rises during welding, the strength as a material does not drop rapidly. Therefore, it is easy to weld these steel plates.

  However, various problems arise when processing such as welding is performed on an extremely thin laminate having a thickness of 0.02 to 0.04 mm, such as an amorphous alloy ribbon.

  For example, an amorphous alloy ribbon is about 1/10 the thickness of an electromagnetic steel sheet, so that each piece is more rigid than a film rather than a steel sheet. As the rigidity becomes weaker.

  Although it is possible to increase the rigidity to some extent as a single object by a method such as increasing the number of welding locations, there is a problem that the soft magnetic properties generally deteriorate at the welding location. Moreover, there is also a problem that productivity is reduced by increasing the number of welding locations. Therefore, there is a problem in obtaining good soft magnetic properties over the entire core without reducing productivity.

  An object of the present disclosure is to firmly fasten a laminated core to a block to be fixed using a fastening member without causing a crack.

  One aspect of the present disclosure includes a laminated body in which laminated sheets are laminated and a reinforcing plate sandwiching the laminated body, and the laminated sheet and the reinforcing plate are fixed to a fixing member on the laminated sheet. The laminated core is provided with a hole through which a fastening member to be inserted is inserted and a groove that divides a region between the hole and the peripheral edge of the laminated sheet in the circumferential direction.

  Another aspect of the present disclosure is a stator core including the laminated core.

  According to the present disclosure, the laminated core can be firmly fastened to the block to be fixed using the fastening member without causing a crack.

Front view of the stator according to the first embodiment Top view of the reinforcing plate of the stator according to the first embodiment The top view of the board which makes the laminated body of the stator which concerns on 1st Embodiment Front view of the stator according to the second embodiment The top view of the reinforcing plate of the stator which concerns on 2nd Embodiment The top view of the board which makes the laminated body of the stator which concerns on 2nd Embodiment The top view of the board which makes the laminated body of the stator which concerns on 2nd Embodiment Front view of the stator according to the third embodiment The top view of the reinforcing plate of the stator which concerns on 3rd Embodiment The top view of the board which makes the laminated body of the stator which concerns on 3rd Embodiment The top view of the board which makes the laminated body of the stator which concerns on 3rd Embodiment Front view of a stator according to a fourth embodiment Rear view of stator according to the fourth embodiment The top view of the reinforcing plate of the stator which concerns on 4th Embodiment The top view of the board which makes the laminated body of the stator which concerns on 4th Embodiment Front view of conventional stator Top view of a magnetic steel sheet forming a conventional stator laminate

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The embodiment described below is an example, and the present disclosure is not limited to this embodiment. The components of the embodiments described below can be combined as appropriate. Some components may not be used.

(First embodiment)
The first embodiment will be described with reference to FIGS. 1A to 1C. FIG. 1A is a front view of a stator (stator) 10. FIG. 1B is a top view of the reinforcing plate 2. FIG. 1C is a top view of the plate 1 a forming the laminate 1.

  As shown in FIG. 1A, a stator 10 of a motor has a laminated core 11 composed of a laminated body 1 and a reinforcing plate 2, and a block 4 to be fixed to fastening blocks 3a, 3b and 3c (an example of a “fastening member”). ). Each layer of the laminate 1 is provided with a cut 5a (details will be described later).

  The laminated body 1 is a laminated body obtained by laminating plates 1a (an example of a “laminated sheet”) made of amorphous alloy ribbons, and exhibits soft magnetic characteristics as a stator core. The reinforcing plate 2 is disposed so as to sandwich the laminate 1 from above and below. The reinforcing plate 2 functions to protect the laminated body 1 formed by laminating thin and brittle amorphous alloy ribbons from above and below.

  As shown in FIG. 1B, the reinforcing plate 2 is a disk-shaped member provided with a circular insertion hole at the center. A motor rotor (not shown) is disposed in the insertion hole. In addition, a plurality of salient poles are provided so as to protrude inward from an outer peripheral portion continuous in the circumferential direction so as to surround the above-described insertion hole. A coil is wound around each salient pole.

  In the outer peripheral portion of the reinforcing plate 2, holes 6a, 6b and 6c are provided at equal intervals on the same circumference. The fastening bolts 3a, 3b and 3c are fixed to the block 4 through the holes 6a, 6b and 6c, respectively. The reinforcing plate 2 is made of a material having higher rigidity than the laminated body 1 and plays a role of protecting the laminated body 1.

  The laminate 1 is configured by laminating plates 1a. As shown in FIG. 1C, the plate 1a has substantially the same shape as the reinforcing plate 2. On the outer periphery of the plate 1a, holes 7a, 7b and 7c corresponding to the holes 6a, 6b and 6c of the reinforcing plate 2 are provided at equal intervals on the same circumference. In addition, notches 5a, 5b and 5c are provided from the outer peripheral edge of the plate 1a to the holes 7a, 7b and 7c.

  The regions on the outer peripheral side of the holes 7a, 7b and 7c are divided into two by the notches 5a, 5b and 5c. That is, the region on the outer peripheral side from the holes 7a, 7b and 7c is divided in the circumferential direction by the cuts 5a, 5b and 5c and is discontinuous. In other words, the holes 7a, 7b and 7c are opened to the outer peripheral edge through the cuts 5a, 5b and 5c.

  In order to firmly fix the laminated body 1 and the reinforcing plate 2 sandwiching the laminated body 1 from above and below to the block 4, it is necessary to strongly tighten the fastening bolts 3a, 3b and 3c. By strongly tightening the fastening bolts 3a, 3b and 3c, a large rotational stress due to friction is applied between the fastening bolts 3a, 3b and 3c and the upper reinforcing plate 2.

  However, since this rotational stress is caused by friction between the fastening bolts 3a, 3b and 3c and the reinforcing plate 2, the laminate 1 is not subjected to rotational stress enough to cause cracking.

  Further, since the reinforcing plate 2 is made of a material having higher rigidity than the laminated body 1, the rotational stress applied to the laminated body 1 becomes smaller. In addition, by making the holes 6a, 6b and 6c for the fastening bolts of the reinforcing plate 2 closed, the rotational stress that is handled by the reinforcing plate 2 can be made larger.

  The fastening bolts 3a, 3b, and 3c are strongly tightened to generate a large compressive stress with the block 4. Thereby, the laminated body 1 and the reinforcement board 2 are firmly fixed to a block.

  On the other hand, the peripheral portions of the fastening bolts 3a, 3b, and 3c and the peripheral portion of the block 4 in the laminate 1 and the reinforcing plate 2 are distorted and subducted due to compressive stress. That is, the laminated body 1 is thinner than the other portions only in the peripheral portions of the fastening bolts 3a, 3b and 3c and the peripheral portion of the block 4.

  This means that with respect to the plate 1a, only the peripheral portions of the holes 7a, 7b and 7c are stretched, and a tensile stress is generated. However, since the holes 7a, 7b and 7c are opened to the outer peripheral edge through the cuts 5a, 5b and 5c, the tensile stress is relaxed by opening the cuts 5a, 5b and 5c. Therefore, a tensile stress enough to cause a crack does not act on the peripheral portions of the holes 7a, 7b and 7c of the plate 1a.

  In addition, even if the notches 5a, 5b, and 5c are opened by tensile stress, the opening width is small, and the size of the holes 7a, 7b, and 7c is not greatly affected. That is, the cuts 5a, 5b, and 5c provided for opening the holes 7a, 7b, and 7c to the outer peripheral edge are not cut so much that the areas of the holes 7a, 7b, and 7c are changed.

  Therefore, even if compressive stress is applied to the peripheral portions of the holes 7a, 7b and 7c, the compressive stress per unit area can be made substantially the same as when the holes 7a, 7b and 7c are closed holes, It is possible to suppress an increase in the amount of distortion.

  Even if the notches 5a, 5b and 5c are opened by the tensile stress, the slightly opened portion remains in the peripheral portion of the fastening bolts 3a, 3b and 3c and the peripheral portion of the block 4.

  Therefore, the region where the magnetic flux as the magnetic circuit is cut off by the opening of the cuts 5a, 5b and 5c and the occurrence of a gap can be reduced, and the loss as a motor can be further reduced.

  Further, the amorphous alloy ribbon has a thickness of about 1/10 compared to a conventional electromagnetic steel sheet, and is closer to a film than a steel sheet. Therefore, it is easy to cut the plate 1a. Further, unlike steel plates, there is no case where the steel plate is deformed by processing and cannot be restored.

  As described above, according to the present embodiment, the laminated core 11 includes the laminated body 1 in which the plates 1a are laminated and the reinforcing plate 2 that sandwiches the laminated body 1, and the plate 1a has a laminated body. Holes 7a, 7b and 7c through which fastening bolts 3a, 3b and 3c for fixing the body 1 and the reinforcing plate 2 to the block 4 are inserted, and regions between the holes 7a, 7b and 7c and the outer peripheral edge of the plate 1a Are provided in the circumferential direction.

  Therefore, the laminated core 11 can be firmly bolted to the block 4 to be fixed without cracking.

  Moreover, in this Embodiment, the case where the laminated body 1 was an amorphous alloy ribbon was described. Amorphous alloy ribbons become brittle when subjected to heat treatment, but according to the present embodiment, cracking is suitably prevented even when heat treatment is performed on the laminate 1 in addition to shape processing. can do. In particular, when the morphous alloy ribbon is nanocrystallized, the degree of progress of embrittlement increases, but according to the present embodiment, it is possible to suitably prevent cracking even in such a case. It is.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. 2A to 2D. FIG. 2A is a front view of the stator 10a. FIG. 2B is a top view of the reinforcing plate 2. FIG. 2C is a top view of the plate 1a forming the laminated body 1A. FIG. 2D is a top view of the plate 1b forming the laminated body 1B.

  In the second embodiment, as compared with the first embodiment, the laminate 1 is constituted by a laminate 1A and a plate 1b (an example of a “second laminate sheet”) constituted by plates 1a. It differs in that it is composed of two types of laminates, ie, a laminate 1B (an example of a “second laminate”).

  As shown in FIG. 2A, the stator 10a of the motor is configured by fixing a laminated core 11a to a block 4 to be fixed by fastening bolts 3a, 3b and 3c. The laminated core 11a is configured by arranging laminated bodies 1A and 1A above and below the laminated body 1B, and further arranging reinforcing plates 2 and 2 above and below the laminated bodies 1A and 1A.

  Since the reinforcing plate 2 shown in FIG. 2B has the same configuration as the reinforcing plate 2 of the first embodiment, a detailed description thereof is omitted.

  The laminated body 1A is configured by laminating plates 1a. The plate 1a shown in FIG. 2C has the same configuration as the plate 1a in the first embodiment, and thus detailed description thereof is omitted.

  The laminate 1B is configured by laminating plates 1b. As shown in FIG. 2D, the plate 1b differs from the plate 1a in that it includes closed holes 8a, 8b, and 8c that are not provided with cuts 5a, 5b, and 5c.

  In the present embodiment, the laminated body 1A which is a layer in the vicinity of the heads of the fastening bolts 3a, 3b and 3c and in the vicinity of the block 4 is constituted by a plate 1a provided with holes 7a, 7b and 7c which are opened in the outer peripheral edge. Is done.

  Thereby, when the compressive stress is applied by tightening the fastening bolts 3a, 3b, and 3c, the notches 5a, 5b, and 5c are opened, the stress is relieved, and the laminate 1A can be prevented from cracking. This is the same as the first embodiment.

  On the other hand, in the laminated body 1B that is a layer other than the layers near the heads of the fastening bolts 3a, 3b, and 3c and the layer near the block 4, the presence of the laminated body 1A disperses the stress, and thus cracks occur. Such a large distortion is not generated.

  In addition, the holes 8a, 8b, and 8c of the plate 1b constituting the laminated body 1B are closed holes that are not cut. Thereby, the laminated body 1B can receive a compressive stress in an area wider than the laminated body 1A. Therefore, the compressive stress per unit area can be reduced, and the amount of subsidence can be further suppressed.

  Further, since the holes 8a, 8b and 8c of the plate 1b constituting the laminated body 1B are not cut, the loss of the motor can be further reduced without cutting the magnetic flux as the magnetic circuit. .

  For these reasons, it is desirable that the laminated body 1 </ b> A having a hole opened in the outer peripheral edge is laminated so as to be in contact with the reinforcing plate 2. Further, the thickness of the laminated body 1A is within a predetermined range from the outer surface of the reinforcing plate 2 (the surface not in contact with the laminated body 1A) according to the tightening torque by the fastening bolts 3a, 3b, and 3c. It is desirable to be adjusted.

  By setting the distance from the outer surface of the reinforcing plate 2 to the boundary between the laminated body 1A and the laminated body 1B to be 1 to 3 mm, the stress can be sufficiently relaxed in the laminated body 1A. Therefore, even if the amorphous alloy ribbon is embrittled by heat treatment and nanocrystallization, the occurrence of cracks in the laminate 1B can be suitably prevented.

(Third embodiment)
A third embodiment will be described with reference to FIGS. 3A to 3D. FIG. 3A is a front view of the stator 10b. FIG. 3B is a top view of the reinforcing plate 2. FIG. 3C is a top view of the plate 1c forming the laminate 1A. FIG. 3D is a top view of the plate 1b forming the laminated body 1B.

  In the third embodiment, as compared with the second embodiment, the notches 5a, 5b and 5c of the plate 1a have slits 9a and 9b having a width equal to or smaller than the diameters of the holes 7a, 7b and 7c, respectively. And 9c are different.

  As shown in FIG. 3A, the stator 10b of the motor is configured by fixing a laminated core 11b to a block 4 to be fixed by fastening bolts 3a, 3b and 3c. The laminated core 11b is configured by arranging laminated bodies 1C and 1C above and below the laminated body 1B, and further arranging reinforcing plates 2 and 2 above and below the laminated bodies 1C and 1C.

  Since the reinforcing plate 2 shown in FIG. 3B has the same configuration as the reinforcing plate 2 of the first embodiment, detailed description thereof is omitted.

  The laminated body 1 </ b> C is configured by laminating plates 1 c (an example of “laminated sheet”). As shown in FIG. 3C, the plate 1c is different from the plate 1a in that the cuts 5a, 5b, and 5c are slits 9a, 9b, and 9c, respectively.

  Also in the third embodiment, the same effect as in the second embodiment described above can be obtained. Further, the slits 9a, 9b, and 9c can be provided by the punching process similar to the holes 7a, 7b, and 7c, or the punching process in the same process, and the cutting process different from the punching process can be omitted.

  In FIG. 3C, the slits 9a, 9b, and 9c have the same width as the diameters of the holes 7a, 7b, and 7c. However, the present invention is not limited to this. The widths of the slits 9a, 9b and 9c may be narrower than the diameters of the holes 7a, 7b and 7c.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. 4A to 4D. FIG. 4A is a front view of the stator 10c. FIG. 4B is a rear view of the stator 10c. FIG. 4C is a top view of the reinforcing plate 2. FIG. 4D is a top view of the plate 1d forming the stacked body 1D.

  In the fourth embodiment, the shape of the plate is different from that in the first embodiment. Specifically, the plate 1d is different from the plate 1a in that a closed hole for fastening a bolt is added.

  As shown in FIGS. 4A and 4B, the stator 10c of the motor has a laminated core 11c composed of a laminated body 1D and a reinforcing plate 2 fixed to a block 4 to be fixed by fastening bolts 3a, 3b and 3c. Consists of.

  Since the reinforcing plate 2 shown in FIG. 4C has the same configuration as the reinforcing plate 2 of the first embodiment, detailed description thereof is omitted.

The laminated body 1D ₁ (an example of a “third laminated body”) and the laminated body 1D ₂ (an example of a “fourth laminated body”) are configured by laminating plates 1d.

  The plate 1d (an example of “laminated sheet”) corresponds to the plate 1a in the first embodiment. As shown in FIG. 4D, the plate 1d has holes 7d, 7e and 7f in addition to the holes 7a, 7b and 7c. The holes 7a, 7d, 7b, 7e, 7c and 7f are provided at equal intervals on the same circumference.

In the present embodiment, the laminated body 1D ₁ which is a layer in the vicinity of the reinforcing plate 2 and the laminated body 1D ₂ sandwiched between the two laminated bodies 1D ₁ have different phases of the plate 1d. Specifically, the plate 1d constituting the laminated body 1D ₂ is the plate 1d constituting the laminated body 1D _1, in a state of being 60 ° rotation in a top view.

According to this embodiment, the fastening bolts 3a, 3b and 3c of the plate 1d constituting the laminated body 1D ₁ is a layer in the vicinity of the head near the well block 4, a hole 7a which is open to the outer peripheral edge, 7b and 7c Is provided.

Thus, the fastening bolts 3a, when the action of the compression stress due to the tightening of 3b and 3c, the cut 5a, a stress by 5b and 5c are opened is alleviated, the point that it is possible to prevent cracking of the laminate 1D _1, the This is the same as the first embodiment.

In addition, the plate 1d constituting the laminated body 1D _2, by 60 ° rotated arranging the plate 1d constituting the laminated body 1D _1, it is possible to change the position of the cut. Thereby, the notch | incision which affects according to the magnetic flux as a magnetic circuit can be distributed.

Further, the stacked body 1D ₁ and the stacked body 1D ₂ can be configured using the same plate 1d. Therefore, the motor can be manufactured at a low cost without increasing the types of parts constituting the laminated core.

  In the above description, the rotational arrangement of the plate has been described only in the fourth embodiment, but the same effect can be obtained in the other embodiments by rotationally arranging the plate. Furthermore, even if there are variations in the thickness of the amorphous alloy ribbon constituting the plate, the variation can be dispersed by rotating the plate so that the structure is more uniform and less likely to cause stress concentration. Is possible.

  Further, in each of the above-described embodiments, the motor structure has been described for the inner rotor type in which the stator is on the outside and the rotor is on the inside. The correspondence between the inner side and the outer side in the shape of the member is only reversed, and the effect of the present disclosure can be obtained similarly.

  According to the laminated core and the stator core according to the present disclosure, the laminated core can be firmly fastened to the block to be fixed by using a fastening member without causing a crack, and industrial applicability is great. It is.

1, 1A, 1B, 1C, 1D, 1D ₁ , 1D ₂ laminate 1a, 1b, 1c, 1d plate 2 reinforcing plate 3a, 3b, 3c fastening bolt 4 block 5a, 5b, 5c notch 6a, 6b, 6c hole 7a , 7b, 7c, 7d, 7e, 7f Holes 8a, 8b, 8c Holes 9a, 9b, 9c Slit 10, 10a, 10b, 10c Stator 11, 11a, 11b, 11c Laminated core 101 Magnetic steel sheet 102 Fastening hole 103 Notch 104 Welding part 105 Fastening bolt 106 Block

Claims (9)

A laminated body in which laminated sheets are laminated;
A reinforcing plate sandwiching the laminate,
The laminated sheet has a hole through which a fastening member for fixing the laminated body and the reinforcing plate to the fixing member is inserted, and a groove that divides a region between the hole and a peripheral edge of the laminated sheet in the circumferential direction. And are provided,
Laminated core. The groove is a cut from the periphery of the laminated sheet to the hole.
The laminated core according to claim 1. The groove is a slit having a width equal to or smaller than the diameter of the hole.
The laminated core according to claim 1. A second laminated body formed by laminating a second laminated sheet sandwiched between the laminated bodies;
The second laminated sheet is provided with a second hole through which the fastening member is inserted, and a region between the second hole and the peripheral edge of the second laminated sheet is in a circumferential direction. Continuous,
The laminated core according to any one of claims 1 to 3. The laminate is
A third laminate in contact with the reinforcing plate;
A fourth laminate sandwiched between the third laminates, and
The laminated sheet constituting the third laminated body and the laminated sheet constituting the fourth laminated body are arranged with a rotational phase shifted from each other.
The laminated core according to any one of claims 1 to 4. The laminated sheet is an amorphous alloy ribbon,
The laminated core according to any one of claims 1 to 5. The laminated sheet is an amorphous alloy ribbon that is partially nanocrystallized,
The laminated core according to any one of claims 1 to 6. The laminated sheet is a nanocrystallized amorphous alloy ribbon,
The laminated core according to any one of claims 1 to 6. Comprising the laminated core according to any one of claims 1 to 8,
Stator core.

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