JP2005045953A - Motor core and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor core which can effectively reduce the cogging torque of a particularly thin motor with a simple constitution without using a skew and which can realize a motor having a good efficiency, and to provide a method for manufacturing the same. <P>SOLUTION: The motor core includes a central core 1 in which annular central core plates are laminated, and a peripheral core 2 which is disposed radially at the outside of the central core 1 and in which a peripheral core plate is laminated. A central core plate of the central core 1 is coupled to the peripheral core plate of the peripheral core 2 by a coupling part. Lengths of both sides of an umbrella part 2c extended to both sides in the circumferential direction from a top side of the peripheral core plate are different at the umbrella part 2c of the peripheral core part 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor core used for a brushless DC motor or the like and a manufacturing method thereof.

  Conventionally, as a motor core, there is one in which a skew is provided by spirally winding and laminating strip-shaped steel plates (see, for example, Japanese Patent Laid-Open No. 2000-262019 (Patent Document 1)). The motor cogging torque is reduced by the skew of the motor core.

However, the motor core has a problem that it is impossible to provide a skew effective for reducing cogging torque when the axial dimension is thin and thin. Further, in the motor core, since the phase of the entire core plate is shifted, the cross-sectional shape of the winding portion becomes a rhombus, and there is a problem that the resistance of the coil increases and the loss increases even with the same number of turns.
JP 2000-262019 A

  Accordingly, an object of the present invention is to provide a motor core capable of effectively reducing the cogging torque of a particularly thin motor with a simple configuration without using skew, and to provide an efficient motor, and a method for manufacturing the same. is there.

  In order to achieve the above object, a motor core according to a first aspect of the present invention is a motor core in which a plurality of core plates each having an annular central portion and a peripheral portion radially disposed outside the central portion are stacked, The length of the circumferential direction of the both sides of the umbrella part extended in the circumferential direction both sides from the front end side of the peripheral part of a several core plate differs, It is characterized by the above-mentioned.

  According to the motor core configured as described above, since the circumferential lengths on both sides of the umbrella portion extending from the front end side of the peripheral portion of the plurality of core plates to both sides in the circumferential direction are different, the change in the magnetic field between the adjacent magnetic poles can be smoothly performed. In addition, the cross-sectional shape of the peripheral portion that is the winding portion remains rectangular.

  The circumferential lengths on both sides of the umbrella portion extending from the distal end side of the peripheral portion of the plurality of core plates to both sides in the circumferential direction may be different for each of the laminated core plates. Each may be different.

  Further, in the motor core of one embodiment, in the state where the plurality of core plates are stacked, one of the adjacent portions of the umbrella portion is a concave shape and the other is a convex shape, The convex portions are fitted with a gap therebetween.

  According to the motor core of the above embodiment, the change in the magnetic field between the adjacent magnetic poles can be effectively smoothed by the fitting of the adjacent portions of the umbrella portion.

  In the motor core according to an embodiment, when the plurality of core plates are stacked, adjacent portions of the umbrella portion are stepped in the thickness direction, and the stepped portions facing each other are gaps. It is characterized by being fitted with a gap.

  According to the motor core of the above embodiment, the change in the magnetic field between the adjacent magnetic poles can be effectively smoothed by the fitting of the adjacent portions of the umbrella portion.

  In one embodiment, the plurality of core plates include a central core plate as the annular central portion and a peripheral core plate as the peripheral portion radially connected to the outside of the central core plate. It is a split type connected by a connecting part.

  According to the motor core of the above embodiment, when connecting the central core plate and the peripheral core plate, it is possible to attach the winding bobbin around which the coil is wound in advance to the connecting portion.

  A motor core manufacturing method according to a second aspect of the present invention is a motor core manufacturing method for manufacturing the motor core, wherein a part of a region serving as an umbrella portion of the peripheral core plate is cut into a belt-shaped plate material made of a magnetic material. By punching out the excision-corresponding hole and punching the strip-shaped plate material from which the excision-corresponding hole has been punched using a basic shape punching die so as to partially overlap the excision-corresponding hole. And a step of creating a plurality of peripheral core plates having different circumferential lengths on both sides of the umbrella portion, and a step of laminating the plurality of peripheral core plates.

  A motor core manufacturing method according to a third aspect of the present invention is a motor core manufacturing method for manufacturing the motor core, wherein a part of a region that becomes an umbrella portion of the core plate is cut out in a belt-shaped plate material made of a magnetic material. Punching the corresponding hole, and punching the strip-shaped plate material from which the excision corresponding hole has been punched by using a basic shape punching die so as to partially overlap the excision corresponding hole. It has the process of producing the several core plate from which the length of the circumferential direction of the both sides of the extending umbrella part differs, and the process of laminating | stacking the said several core plate.

  As apparent from the above, according to the motor core of the first invention, the circumferential lengths on both sides of the umbrella portion extending from the distal end side of the peripheral portion of the plurality of core plates to both sides in the circumferential direction are stacked. Since each plate is different, the change in the magnetic field between the adjacent magnetic poles can be smoothed, the cogging torque can be reduced with a simple configuration without using a skew, and the vibration and noise of the motor can be suppressed. In addition, unlike the skew structure in which the cross-sectional shape of the winding part is a diamond shape, the cross-sectional shape of the peripheral part, which is the winding part, can be kept rectangular, so that the resistance of the coil can be reduced even with the same number of turns, with low loss and high An efficient motor can be realized.

  Further, in the state where the plurality of core plates are laminated, one of the adjacent portions of the umbrella portion is a concave shape and the other is a convex shape, and the opposite concave shape portion and the convex shape portion leave a gap. By fitting together, the change in the magnetic field between the adjacent magnetic poles can be effectively smoothed.

  Further, in a state where the plurality of core plates are laminated, adjacent portions of the umbrella portion are stepped in the thickness direction, and the opposed stepped portions are fitted with a gap therebetween. Thus, the change in the magnetic field between adjacent magnetic poles can be effectively smoothed.

  Further, a split type core plate in which the central core plate as the annular central portion and the peripheral core plate as the peripheral portion radially connected to the outside of the central core plate are connected by a connecting portion is stacked. As a result, when connecting the central core plate and the peripheral core plate, a winding bobbin on which a coil is wound in advance can be attached to the connection portion, so that the space between the peripheral core portions causing cogging torque can be reduced. Since there is no restriction on the space for inserting the winding nozzle of the winding machine (the space between adjacent peripheral core portions), the degree of freedom in the winding conditions is improved. In addition, since the coil is wound around the bobbin separately from the motor core, it is possible to use a winding machine that winds the coil by rotating the bobbin itself, instead of the nozzle rotating type winding machine, and rotates the bobbin itself at high speed. Thus, there is no need to wind a coil by using a large number of winding machines like an integrated motor core, and the equipment cost can be reduced.

  Further, according to the motor core manufacturing method of the second aspect of the present invention, without preparing a large number of complicated core molds for peripheral core plates with different umbrella shapes on the front end side, it is possible to perform one peripheral core plate for cutting and excision corresponding holes. It can be manufactured by using a simple punching die, and the cost can be reduced.

  Further, according to the motor core manufacturing method of the third aspect of the present invention, without preparing a large number of complicated die-cuts for core plates having different umbrella shapes on the tip side, it is easy to remove one core plate and use it for excision corresponding holes. It can be manufactured by using a punching die, and the cost can be reduced.

  Hereinafter, the motor core and the manufacturing method thereof according to the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a plan view of a plurality of peripheral core plates as peripheral portions of a core plate constituting the motor core according to the first embodiment of the present invention. As shown in FIG. 1, 12 peripherals having peripheral core plate bases P1a to P12a and peripheral core plate umbrella parts P1b to P12b extending from the respective distal ends of the peripheral core plate bases P1a to P12a in the circumferential direction. By laminating the core plates P1 to P12 in order, the peripheral core portion of the split motor core is configured. The peripheral core plate umbrella portions P1b to P12b of the peripheral core plates P1 to P12 have different lengths in the circumferential direction (right and left directions in FIG. 1) on both sides.

  2A is a view of the umbrella portion 2c of the peripheral core portion 2 on which the peripheral core plates P1 to P12 are stacked as viewed from the outside in the radial direction, and FIG. 2B is a plan view of the peripheral core portion 2. It is. As shown in FIG. 2 (b), the peripheral core portion 2 includes a peripheral core base portion 2a, a peripheral core recess portion 2b provided on the rear end side of the peripheral core base portion 2a, and a distal end side of the peripheral core base portion 2a. And a peripheral core umbrella 2c. As shown in FIG. 2 (a), the peripheral core umbrella portion 2c on the distal end side of the peripheral core portion 2 has a V-shaped concave shape in one circumferential direction (left and right direction in FIG. 2 (a)) and the other is It has a convex shape.

  As shown in FIG. 2A, in the peripheral core plates P1 and P2, the left side of the peripheral core plate umbrella portions P1b and P2b is the longest and the right side is the shortest. Next, in the peripheral core plate P3, the left side of the peripheral core plate umbrella portion P3b is shorter than the peripheral core plate P1 by a predetermined dimension, and the right side is the same length as the peripheral core plate P1. Next, in the peripheral core plate P4, the left side of the peripheral core plate umbrella portion P4b has the same length as the peripheral core plate P3, and the right side is longer than the peripheral core plate P3 by a predetermined dimension. Next, in the peripheral core plate P5, the left side of the peripheral core plate umbrella portion P5b is shorter than the peripheral core plate P4 by a predetermined dimension, and the right side is the same length as the peripheral core plate P4. Next, in the peripheral core plates P6 and P7, the left side of the peripheral core plate umbrella portions P6b and P7b has the same length as the peripheral core plate P5, and the right side is longer than the peripheral core plate P5 by a predetermined dimension, and this time is the longest. . Next, in the peripheral core plate P8, the left side of the umbrella portion P8b is the same length as the peripheral core plate P7, the right side is shorter than the peripheral core plate P7 by a predetermined dimension, and the peripheral core plates P8 and P5 have the same shape. Yes. Next, in the peripheral core plate P9, the left side of the peripheral core plate umbrella portion P9b is longer than the peripheral core plate P8 by a predetermined dimension, the right side is the same length as the peripheral core plate P8, and the peripheral core plates P9 and P4 are the same. It has a shape. Next, in the peripheral core plate P10, the left side of the peripheral core plate umbrella portion P10b has the same length as the peripheral core plate P9, the right side is shorter than the peripheral core plate P9 by a predetermined dimension, and the peripheral core plates P10 and P3 have the same shape. I am doing. Next, in the peripheral core plates P11 and P12, the left side of the peripheral core plate umbrella portions P11b and P12b is longer than the peripheral core plate P10 by a predetermined length, and the right side has the same dimensions as the peripheral core plate P10. P12 and peripheral core plates P1 and P2 have the same shape.

  FIG. 3 is a view showing a state before the motor core and the winding bobbin according to the first embodiment of the present invention are combined. In FIG. 3, 1 is an annular central core portion, 2 is a plurality of peripheral core portions arranged radially on the outside of the central core portion 1, and 3 is a winding bobbin around which a coil 4 is wound.

  The central core portion 1 is formed by stacking a plurality of central core plates 10 having the same shape as an annular central portion. The central core plate 10 includes an annular central core plate base portion 10a and a central core plate base portion thereof. And 10 central core plate convex portions 10b provided radially at a predetermined interval in the circumferential direction 10a and radially outward. Further, the peripheral core portion 2 is formed by laminating 12 peripheral core plates P1 to P12 shown in FIG.

  The central core plate 10 and the peripheral core plates P1 to P12 (only P1 is shown in FIG. 3) are connected to each layer by fitting the central core plate convex portion 10b and the peripheral core plate concave portion P1c.

  Then, as shown in FIG. 3, after inserting the rear end side (peripheral core plate recess 20c side) of the peripheral core portion 2 into the winding bobbin 3, it is inserted as it is toward the center of the central core portion 1, The central core plate convex portion 10b of the central core portion 1 and the peripheral core plate concave portion P1c of the peripheral core portion 2 are fitted for each layer (the same applies to the peripheral core plate concave portions P2c to P12c). Then, the central core plate 10 and the peripheral core plate P1 are integrated by fixing the peripheral core plate P1 to the central core plate 10 by sandwiching the central core plate convex portion 10b from the circumferential direction by the peripheral core plate concave portion P1c. It has become. In this way, by inserting a plurality of peripheral core plates P1 from the outside in the radial direction into the central core plate 10 without using another member, the central core portion 1 in which the plurality of central core plates 10 are stacked and a plurality of peripherals Since the peripheral core portion 2 on which the core plate P1 is laminated can be integrated, the manufacturing can be easily automated and the cost can be reduced.

  4A is a plan view of an armature 30 in which the peripheral core portion 2, the winding bobbin 3 and the central core portion 1 are combined, and FIG. 4B is a plan view of the umbrella portion 2c of the peripheral core portion 2. It is the figure seen from the radial direction outer side, FIG.4 (c) is a principal part enlarged view of FIG.4 (b). As shown in FIG. 4B, the umbrella portion 2c on the distal end side of the peripheral core portion 2 has a shape in which the other convex shape is accommodated in one V-shaped concave shape of the umbrella portions adjacent to each other.

  FIG. 5 is an enlarged view of the connecting portion in the region A of FIG. 4 (a), and the winding bobbin is omitted for easy understanding of the drawing.

  As shown in FIG. 5, a locking portion 21 that protrudes toward the peripheral core plate recess P1c is provided near the tip of the arm portion 22 on both sides of the peripheral core plate recess P1c of the peripheral core plate P1. On the other hand, a stepped portion 11 is provided on both sides of the central core plate convex portion 10b of the central core plate 10 in the vicinity of the central core plate base portion 10a so that the locking portions 21 of the peripheral core plate P1 are locked. Triangular retaining portions 12 are provided on the outer side of the core plate base portion 10a and on both sides of the central core plate convex portion 10b. That is, the retaining portion 12 is provided outside the annular central core plate base portion 10a and between the central core plate convex portions 10b. The retaining portion 12 presses the tip of the arm portion 22 of the peripheral core plate P1 adjacent to both sides toward the peripheral core plate recess P1c.

  According to the motor core having the above configuration, the peripheral core portion 2 is formed by laminating a plurality of peripheral core plates having different circumferential lengths on both sides of the umbrella portion extending from the distal end side of the peripheral core portion 2 to both sides in the circumferential direction. Accordingly, the umbrella portion 2c on the distal end side of the peripheral core portion 2 has a shape in which the convex shape is accommodated in the V-shaped concave shape of the umbrella portions 2c adjacent to each other. Thereby, the change of the magnetic field between the adjacent magnetic poles can be smoothed, and the cogging torque can be reduced. In addition, unlike the skew structure in which the cross-sectional shape of the winding part is a rhombus, the cross-sectional shape of the peripheral part, which is the winding part, can be kept rectangular, so that the resistance of the coil can be reduced even with the same number of turns and the loss is reduced. Efficiency.

  Therefore, according to the motor core of the first embodiment, the cogging torque of a motor with a particularly thin motor core can be reduced with a simple configuration without using skew, and the vibration and noise of the motor can be effectively suppressed. An efficient motor can be realized.

  Further, according to the motor core, the central core plate 10 of the central core portion 1 and the peripheral core plates P1 to P12 of the peripheral core portion 2 are directly connected by the connecting portion without any other member and are in close contact with each other. Therefore, it is possible to prevent the magnetic force from being lowered due to the air gap of the connecting portion or the magnetic force of each magnetic pole from being varied depending on the degree of the air gap. Further, when the central core portion 1 and the peripheral core portion 2 are connected, the winding bobbin 5 on which a coil is wound in advance can be attached to the connection portion, so that the space between the peripheral core portions that causes cogging torque is reduced. In addition, it is not limited by the space for inserting the winding nozzle of the winding machine (the space between adjacent peripheral core portions), so the degree of freedom in the winding conditions is improved. In addition, since the coil is wound around the bobbin separately from the motor core, it is possible to use a winding machine that winds the coil by rotating the bobbin itself, instead of the nozzle rotating type winding machine, and rotates the bobbin itself at high speed. Thus, there is no need to wind a coil by using a large number of winding machines like an integrated motor core, and the equipment cost can be reduced.

  FIG. 6 is a view for explaining the method of manufacturing the motor core according to the first embodiment. As shown in FIG. 6, first, a plurality of strip-shaped plate members 50 made of a magnetic material are spaced apart from each other at a predetermined interval in the longitudinal direction. At the same time as punching out the reference holes 63 in two rows, excision corresponding holes 51 to 62 for excising a part of the region that becomes the umbrella portion of the peripheral core portion are punched in accordance with the positions of the respective reference holes 163. Next, the strip-shaped plate material 50 in which the excision corresponding holes 51 to 62 are punched is punched using a basic shape punching die (70 shown in FIG. 6) so as to partially overlap the excision corresponding holes 51 to 62. Thus, a plurality of peripheral core plates having different circumferential lengths on both sides of the umbrella portion extending from the tip side to both sides in the circumferential direction are created. A peripheral core portion of the motor core is manufactured by stacking a plurality of peripheral core plates thus punched.

  As described above, according to the method for manufacturing the motor core, without preparing a large number of complicated die cuttings for peripheral core plates with different umbrella shapes on the front end side, it is easy to perform die cutting for one peripheral core plate and excision corresponding holes. It can manufacture by using a die-cutting and can reduce cost.

  In the first embodiment, an annular central core portion 1 in which a plurality of central core plates 10 are stacked, and radially disposed outside the central core portion 1, and twelve peripheral core plates P1 to P12 are provided. Although the motor core having the plurality of laminated peripheral core portions 2 has been described, the number and shape of each core plate may be appropriately set according to the motor specifications and the like.

(Second embodiment)
FIG. 7 is a plan view of a plurality of core plates constituting the motor core according to the second embodiment of the present invention. As shown in FIG. 7, each of the core plates P101 includes annular central portions P101a to P112a, peripheral portions P101b to P112b radially disposed outside the annular central portions P101a to P112a, and peripheral portions P101b to P101b. Umbrella portions P101c to P112c extending from the front end side of P112b to both sides in the circumferential direction are provided. For each of the core plates P101 to P112, the lengths in the circumferential direction (left and right directions in FIG. 7) on both sides of the umbrella portions P101c to P112c are different, and the motor core is configured by sequentially stacking the core plates P101 to P112.

  FIG. 8 (a) is an enlarged view of the main part of the umbrella portion 104 of the motor core 101 on which the core plates P101 to P112 shown in FIG. 7 are stacked as seen from the outside in the radial direction. FIG. 2 is a plan view of a motor core 101. FIG. As shown in FIG. 8 (a), the motor core 101 is formed by stacking twelve core plates P101 to P112 (shown in FIG. 7), so that the umbrella portion 104 on the distal end side of the peripheral core portion 103 is the first embodiment. Like the peripheral core umbrella 2c shown in FIG. 2 (a), one of the circumferential directions (left and right directions in FIG. 8 (a)) has a V-shaped concave shape, and the other has a convex shape.

  FIG. 9 is a plan view showing a state in which the bobbin 5 is insert-molded on the motor core 101. As shown in FIG. 9, the bobbin 5 is formed in each peripheral core part 103 by insert molding. A coil (not shown) is wound around each bobbin 5 that is insert-molded to complete the armature.

  FIG. 10A is a plan view of the armature, and FIG. 10B is a view of the umbrella portion 104 on the distal end side of the peripheral core portion 103 as viewed from the outside in the radial direction. These are the principal part enlarged views of FIG.10 (b).

  According to the motor core having the above configuration, the peripheral core portion 103 is formed by stacking a plurality of core plates P101 to P112 (shown in FIG. 8) having different circumferential lengths on both sides of the umbrella portion 104 to form the motor core 101. As shown in FIG. 10 (b), the tip-side umbrella portion 104 has a configuration in which the convex shape faces the V-shaped concave shape of the umbrella portions 104 adjacent to each other. Thereby, the change of the magnetic field between the adjacent magnetic poles can be smoothed, and the cogging torque is reduced.

  Therefore, according to the motor core of the second embodiment, the cogging torque of the motor with a thin motor core can be reduced with a simple configuration without using skew, and the vibration and noise of the motor can be effectively suppressed. An efficient motor can be realized.

  FIG. 11 is a view for explaining a method of manufacturing the motor core according to the second embodiment. As shown in FIG. 11, first, a plurality of strips 150 made of a magnetic material are provided at a predetermined interval in the longitudinal direction. At the same time as punching out the reference holes 163 in two rows, the excision corresponding holes 151 to 162 for excising a part of the region that becomes the umbrella portion of the peripheral core portion are punched out according to the position of each reference hole 163. Next, the strip-shaped plate material 150 in which the excision-corresponding holes 151 to 162 are punched is punched by using a basic shape punching die (170 shown in FIG. 11) so as to partially overlap the excision-corresponding holes 151 to 162. Thereby, the several core plate from which the length of the circumferential direction of the both sides of the umbrella part extended in the circumferential direction both sides from a front end side differs is produced. A motor core is manufactured by stacking a plurality of punched core plates.

  As described above, according to the method for manufacturing a motor core described above, it is possible to perform one core plate punching and a simple punching for excision corresponding holes without preparing a large number of complicated punching for core plates having different umbrella shapes on the tip side. By using it, it can manufacture and cost can be reduced.

  In the second embodiment, the motor core in which the 12 core plates P101 to P112 having 12 peripheral portions radially arranged outside the annular central portion is described. However, the number and shape of the core plates are not described. May be set as appropriate according to the motor specifications.

(Third embodiment)
FIG. 12 (a) is a plan view of an armature using a motor core according to a third embodiment of the present invention, and FIG. 12 (b) is a view of the umbrella portion of the peripheral core portion of the motor core as seen from the outside in the radial direction. FIG. 12 (c) is an enlarged view of the main part of FIG. 12 (b). The motor core according to the third embodiment is a split type in which a central core plate and a peripheral core plate are connected by a connecting portion, like the motor core according to the first embodiment except for an umbrella portion.

  In the motor core 201 shown in FIG. 12B, the umbrella portion 204 on the distal end side of the peripheral core portion 203 has a configuration in which the inclined shapes of the umbrella portions adjacent to each other face each other.

  The motor core according to the third embodiment has the same effect as the motor core according to the first embodiment.

(Fourth embodiment)
FIG. 13 (a) is a plan view of an armature using a motor core according to a fourth embodiment of the present invention, and FIG. 13 (b) is a view of the umbrella portion of the peripheral core portion of the motor core as seen from the outside in the radial direction. FIG. 13 (c) is an enlarged view of the main part of FIG. 13 (b). The motor core according to the fourth embodiment is formed by stacking integral core plates in the same manner as the motor core according to the second embodiment except for the umbrella portion.

  As shown in FIG. 13 (b), in the motor core 301, the umbrella portion 304 on the distal end side of the peripheral core portion 303 has a configuration in which the inclined shapes of the umbrella portions adjacent to each other face each other.

  The motor core according to the fourth embodiment has the same effect as the motor core according to the second embodiment.

  In the first and second embodiments, the V-shaped concave shape and the convex shape of the umbrella portions adjacent to each other are opposed to each other. In the third and fourth embodiments, the inclined shapes of the umbrella portions adjacent to each other are formed. Although it was the form which opposes, the form of the umbrella part adjacent to each other is not restricted to this.

FIG. 1 is a plan view of a plurality of peripheral core plates constituting the peripheral core portion of the motor core according to the first embodiment of the present invention. FIG. 2A is a view of the umbrella portion of the peripheral core portion on which the peripheral core plates are stacked as viewed from the outside in the radial direction, and FIG. 2B is a plan view of the peripheral core portion. FIG. 3 is a view showing a state before the peripheral core portion, the winding bobbin and the central core portion are combined. FIG. 4A is a plan view of an armature in which the peripheral core portion is combined with the winding bobbin and the central core portion, and FIG. 4B is a main portion of the umbrella portion of the peripheral core portion viewed from the outside in the radial direction. FIG. FIG. 5 is an enlarged view of a region A in FIG. FIG. 6 is a diagram for explaining a method of manufacturing the peripheral core plate. FIG. 7 is a plan view of a plurality of core plates constituting the motor core according to the second embodiment of the present invention. FIG. 8 (a) is a view of the umbrella portion of the motor core on which the core plate is laminated as seen from the outside in the radial direction, and FIG. 8 (b) is a plan view of the motor core. FIG. 9 is a plan view showing a state where a bobbin is insert-molded in the motor core. 10 (a) is a plan view of the armature, FIG. 10 (b) is a view of the umbrella portion of the peripheral core portion as seen from the outside in the radial direction, and FIG. 10 (c) is a diagram of FIG. 10 (b). FIG. FIG. 11 is a view for explaining a method of manufacturing the core plate. FIG. 12 (a) is a plan view of an armature using a motor core according to a third embodiment of the present invention, and FIG. 12 (b) is a view of the umbrella portion of the peripheral core portion of the motor core as seen from the outside in the radial direction. FIG. 12 (c) is an enlarged view of the main part of FIG. 12 (b). FIG. 13 (a) is a plan view of an armature using a motor core according to a fourth embodiment of the present invention, and FIG. 13 (b) is a view of the umbrella portion of the peripheral core portion of the motor core as seen from the outside in the radial direction. FIG. 13 (c) is an enlarged view of the main part of FIG. 13 (b).

Explanation of symbols

1 ... Central core part,
2. Peripheral core part,
2a ... peripheral core base,
2b Peripheral core recess,
2c ... Peripheral core umbrella,
3 ... Winding bobbin,
4 ... Coil,
5 ... Bobbin,
10: Central core plate 10a: Central core plate base,
10b ... Central core plate convex part,
11 ... the step,
12 ... retaining part,
21 ... locking part,
22 ... arm,
30 ... Armature,
50 ... strip-shaped plate material,
51-62, 151-162 ... excision corresponding hole,
63,163 ... reference hole,
P1-P12 ... peripheral core plate,
P1a-P12a ... peripheral core plate base,
P1b to P12b ... peripheral core plate umbrella,
P1c to P12c ... peripheral core plate recess,
P101-P112 ... Core plate,
P101a-P112a ... Central part,
P101b-P112b ... peripheral part,
P101c-P112c ... Umbrella part.

Claims (6)

A motor core in which a plurality of core plates (P1 to P12, 10, P101 to P112) having an annular central portion and a peripheral portion radially disposed outside the central portion are laminated,
A motor core characterized in that circumferential lengths on both sides of umbrella portions extending from the distal end side of the peripheral portion of the plurality of core plates (P1 to P12, 10, P101 to P112) to both sides in the circumferential direction are different. The motor core according to claim 1,
In the state in which the plurality of core plates (P1 to P12, 10, P101 to P112) are stacked, one of the adjacent portions of the umbrella portion is concave and the other is convex, and the concave shapes facing each other are A motor core, wherein the portion and the convex portion are fitted with a gap. The motor core according to claim 1,
In the state where the plurality of core plates are laminated, the adjacent portions of the umbrella portion are stepped in the thickness direction, and the stepped portions facing each other are fitted with a gap therebetween. Motor core characterized by The motor core according to any one of claims 1 to 3,
The plurality of core plates include a central core plate (10) as the annular central portion, and peripheral core plates (P1 to P12) as the peripheral portions radially connected to the outside of the central core plate (10). And a motor core, wherein the motor core is a split type connected by a connecting portion. A motor core manufacturing method for manufacturing the motor core according to claim 4,
A step of punching a corresponding hole (51-62) for excising a part of a region to be an umbrella part (P1b-P12b) of the peripheral core plate (P1-P12) in a belt-like plate material (50) made of a magnetic material;
By punching the strip-shaped plate material (50) from which the cut-out corresponding holes (51-62) have been punched using a basic shape punching die so as to partially overlap the cut-out corresponding holes (51-62), Creating a plurality of peripheral core plates (P1 to P12) having different circumferential lengths on both sides of umbrella portions (P1b to P12b) extending from the side to both sides in the circumferential direction;
And a step of laminating the plurality of peripheral core plates (P1 to P12). A motor core manufacturing method for manufacturing the motor core according to claim 1,
Punching out excision corresponding holes (151 to 162) for excising a part of the region to be the umbrella portion (P101c to P112c) of the core plate (P101 to P112) in the belt-shaped plate material (150) made of a magnetic material;
By punching the strip-shaped plate material (150) from which the excision-corresponding holes (151 to 162) have been punched using a basic shape die so as to partially overlap the excision-corresponding holes (151 to 162), Creating a plurality of core plates (P101 to P112) having different circumferential lengths on both sides of umbrella portions (P101c to P112c) extending from the side to both sides in the circumferential direction;
And a step of stacking the plurality of core plates (P101 to P112).

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