JP5361277B2 - motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor that ensures a high dielectric strength between a drive coil and a stator core by improving the structure of the third insulator. <P>SOLUTION: In the split core 50 of the motor, a drive coil 6 is wound via first and second insulators 71 and 72, which pile up on top of each other in the axial direction L of the motor, and third sheet-shaped insulators 73, which form a pair in two sheets. The third insulator 73 includes a jut 738, which juts out in the axial direction L of the motor from the circumferential end of a peripheral circular arc 53. Accordingly, at the inner perimetrical face of the peripheral circular arc 53 of the split core 50, the jut 738 of the third insulator 73 lies, with a margin, in a pile on corner sections 735 which are positioned on both its axial sides at its circumferential end, so in the split core 50, a section, which is exposed from the first insulator 71, the second insulator 72 or the third insulator 73, does not exist in the vicinity of the drive coil 6. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a motor in which a drive coil is wound around each of a plurality of salient poles arranged in a circumferential direction in a stator core via an insulator.

  The motor includes a stator in which a coil is wound around each of a plurality of salient poles arranged in the circumferential direction in the stator core, and a rotor that is disposed with respect to the stator via a gap. Among such motors, for example, a motor used for an electric blower, a hermetic electric compressor, or the like requires a high withstand voltage between the stator core and the drive coil. For this reason, as the insulator, a first insulator and a second insulator are arranged on both sides of the stator core in the motor axial direction, and a portion around which the drive coil is wound in the stator core is referred to as slot insulating paper. It is proposed to cover with (see Patent Document 1).

Here, the 3rd insulator is set to the width dimension equal to the dimension of the axial direction of a stator core.
JP 2001-112205 A

  However, if the width dimension of the third insulator is made equal to the dimension in the axial direction of the stator core, there is a problem in that the withstand voltage between the end portion of the stator core and the drive coil tends to decrease. That is, as shown in FIGS. 5A and 5B, the drive coil 6 is wound in a state where the divided core 50 used for the stator core 5 is covered with the first insulator 71, the second insulator 72, and the third insulator 73. At this time, when the width dimension in the axial direction of the third insulator 73 is set to a width dimension equal to the dimension in the axial direction of the stator core 5, the inner circumferential surface of the outer circumferential side arc portion 53 of the stator core 5 is axial in the circumferential end portion. As a result, the edge of the third insulator 73 overlaps the corner portions 535 located on both sides. Further, the corner portion 535 of the stator core 5 does not cover the first insulator 71 and the second insulator 72 at all, and the corner portion 535 of the stator core 5 is in the vicinity of the drive coil 6 in the first insulator 71 and the second insulator. 72 and the third insulator 73 are exposed. For this reason, the withstand voltage decreases between the edge of the stator core 5 and the drive coil 73. Note that the configurations shown in FIGS. 5A and 5B are reference examples devised by the inventors of the present application so that the features of the present invention can be easily understood, and are not conventional examples.

  In view of the above problems, an object of the present invention is to provide a motor that can improve the configuration of an insulator and ensure a high withstand voltage between a drive coil and a stator core.

In order to solve the above-described problem, in the present invention, a stator core having outer peripheral arc portions extending from the outer peripheral end portions of a plurality of salient poles protruding in the radial direction to both sides in the circumferential direction, and around the salient poles In a motor having a stator including a drive coil wound through an insulator and a rotor including a rotor magnet facing a tip of the salient pole via a predetermined gap, the insulator includes the A first insulator covering one end of the stator core in the motor axial direction; a second insulator covering the other end of the stator core in the motor axial direction; and salient pole side surfaces located on both sides of the salient pole in the circumferential direction; And a set of two sheet-like sheets covering the inner circumferential surface located radially inward in the outer circumferential arc portion on both sides in the circumferential direction of the salient poles With 3 and the insulator, and the third insulator is provided with a projecting portion that projects on the motor axial direction than the circumferential direction of the end portion of the outer circumferential side arc portion, the first insulator and the second insulator, the overhang A groove for accommodating the portion is formed, and the projecting portion is formed by a wide portion continuously extended in the motor axial direction from the inner side in the circumferential direction to the outer side in the circumferential direction covering the side surface of the salient pole . It is characterized by.

  The present invention can be applied to any of an inner rotor type motor using a split core, an outer rotor type motor using a split core, and an outer rotor type motor using an integral core. When the stator core is a split core, the outer peripheral side flange portion is divided for each salient pole. On the other hand, when the stator core is an integral core, the inner peripheral side flange portion is connected in an annular shape.

In the present invention, the third insulator includes, at the circumferential end, a projecting portion that projects in the motor axial direction from the circumferential end of the outer circumferential arc portion, and the projecting portion includes the first insulator and the second insulator. In the inner peripheral surface of the outer peripheral arc portion of the stator core, the corner portions positioned on both sides in the axial direction are reliably covered with the inner peripheral surface of the stator core. Therefore, the stator core has no exposed portion from the first insulator, the second insulator, and the third insulator in the vicinity of the drive coil, so that the withstand voltage between the stator core and the drive coil can be improved. In addition, since the first insulator and the second insulator are formed with a groove that accommodates a portion that protrudes in the motor axial direction in the protruding portion, the protruding portion of the third insulator is securely held on both sides in the motor axial direction. can do.

  In the present invention, in the third insulator, it is preferable that the projecting portion projects in a circumferential direction from a circumferential end portion of the outer circumferential arc portion. If comprised in this way, the withstand voltage which wraps around in the circumferential direction between a stator core and a drive coil can be improved.

  In this case, it is preferable that a portion of the projecting portion that projects in the circumferential direction is bent inward in the radial direction so as to cover the drive coil. If comprised in this way, generation | occurrence | production of the spark and short circuit between adjacent drive coils can be prevented, and the withstand voltage of the drive coil in the circumferential direction can be made high.

  The present invention is particularly effective when a split core in which the outer peripheral side flange is divided for each salient pole is used as the stator core. That is, when the split core is used, the third insulator is short and easily displaced. However, according to the present invention, the inner peripheral surface of the outer peripheral arc portion of the stator core is positioned on both sides in the axial direction at the end in the circumferential direction. Since the corner portion to be covered is covered with the overhanging portion of the third insulator with a margin, even if a slight displacement occurs in the third insulator, the first insulator, the second insulator, and the Since there is no portion exposed from the third insulator, the withstand voltage between the end of the stator core and the drive coil is high.

  In the present invention, it is preferable that the first insulator and the second insulator are spaced apart from each other in the motor axial direction, and the third insulator is exposed between them. If comprised in this way, since the edge part of a motor axial direction does not overlap between a 1st insulator and a 2nd insulator, an extra level | step difference will not generate | occur | produce even if dimensional accuracy is loose. Further, since the first insulator and the second insulator have a short portion extending in a thin plate shape in the motor axis direction, the first insulator and the second insulator can be manufactured with high shape accuracy and dimensional accuracy by molding. . Further, in the configuration in which insulation is ensured using the third insulator in addition to the first insulator and the second insulator, the end portions in the motor axial direction of the first insulator and the second insulator are separated from each other in the motor axial direction. If the configuration is adopted, even if the length of the core in the axial direction changes for each model, it is only necessary to change the dimension of the third insulator in the axial direction, and it is necessary to change the design of the first and second insulators. Therefore, the cost can be reduced.

  In the present invention, on the inner peripheral surface of the outer peripheral arc portion of the stator core, the corner portions positioned on both sides in the axial direction at the end portion in the circumferential direction are covered with a margin by the protruding portion of the third insulator. Therefore, since there is no portion exposed from the first insulator, the second insulator, and the third insulator in the vicinity of the drive coil in the stator core, the withstand voltage between the edge of the stator core and the drive coil can be improved. .

  Hereinafter, an inner rotor type motor using a split core will be described as a motor to which the present invention is applied with reference to the drawings.

(General configuration of motor)
1A and 1B are a longitudinal sectional view and a transverse sectional view, respectively, of a motor to which the present invention is applied. The left half of FIG. 1 (a) shows a state of cutting at a position passing through the split core, and the right half of FIG. 1 (b) shows a state of cutting at a position avoiding the split core. Is shown.

  1A and 1B, a motor 1 of this embodiment is a three-phase inner rotor type DC brushless motor, and a motor case 2 having both ends in the motor axial direction L open ends, and a motor case 2 has an annular stator 4 fixed on the inner side of 2 and a rotor 8 extending in the motor axial direction L on the inner side of the stator 4. The rotor 8 includes a rotating shaft 80 that extends in the motor axial direction L inside the stator 4, and a rotor magnet 85 that is fixed to the outer peripheral surface of the rotating shaft 80. The rotating shaft 80 is rotatably supported by a first bearing 36 and a second bearing 37, and each of the first bearing 36 and the second bearing 37 is a first bearing held in the motor case 2. The holder 31 and the second bearing holder 32 are respectively held. A cup-shaped cover 39 is attached to the outside of the second bearing holder 32 on the open end side of the motor case 2 opposite to the output side, and an encoder (not shown) is disposed inside the cover 39. Has been.

  The stator 4 has a stator core 5 formed by connecting a plurality of split cores 50 in an annular shape. In this embodiment, the number of divided cores 50 is nine, and each of the nine divided cores 50 includes salient poles 51 projecting inward in the radial direction D, as will be described later. The drive coil 6 is wound around the split core 50 via a first insulator 71 and a second insulator 72 arranged on both sides in the motor axial direction L. In the present embodiment, each of the nine divided cores 50 is covered with a sheet-like third insulator 73 described later with reference to FIGS. 2 and 3, and the drive coil 6 is placed on the third insulator 73. It is wound.

  The 1st insulator 71 and the 2nd insulator 72 are synthetic resin property which consists of polybutylene terephthalate, polyphenylene sulfide, etc., and a glass fiber may be mix | blended as needed. The third insulator 73 is so-called slot insulating paper and is considerably thinner than the first insulator 71 and the second insulator 72. As the third insulator 73, a synthetic resin sheet such as polyester, polyphenylene sulfide, polyethylene, or polypropylene can be used. If a synthetic resin sheet of polyphenylene sulfide is used, excellent heat resistance can be obtained.

(Configuration of split core 50 and insulator)
FIG. 2 is a perspective view of the split core 50 used in the motor 1 according to the reference example of the present invention. 3A and 3B are an exploded perspective view of the split core 50 shown in FIG. 2 and a perspective view showing a state before the drive coil 6 is wound after the insulator is attached to the split core 50, respectively. is there.

  As shown in FIG. 2 and FIG. 3A, the split core 50 is composed of a laminated core in which a plurality of magnetic plates are laminated in the motor axial direction L. The salient poles 51 project in the radial direction D, and the salient poles 51. The inner circumferential side arc portion 52 extending from the inner circumferential side end portion to both sides in the circumferential direction and the outer circumferential side arc portion 53 extending from the outer circumferential side end portion of the salient pole 51 to both sides in the circumferential direction are provided. Therefore, in the split core 50, slots surrounded by the salient poles 51, the inner circumference side arc portion 52, and the outer circumference side arc portion 53 are formed on both sides of the salient pole 51 in the circumferential direction. A drive coil 6 is arranged.

  With respect to the split core 50, the first insulator 71 covers one end (output end) in the motor axial direction L, and the other end (counter output end) in the motor axial direction L. The second insulator 72 is covered.

  Each of the first insulator 71 and the second insulator 72 has the same structure, and the projecting extreme surface covering portions 710 and 720 that cover the end surfaces of the salient poles 51 located in the motor axial direction L in the salient poles 51, Inner peripheral side flanges 711 and 721 that cover the end surface located in the motor axial direction L in the inner peripheral arc portion 52 with a shape protruding outward from the extreme surface covering portions 710 and 720 in the motor axial direction L, and inner peripheral side flanges Outer peripheral side flanges 712 and 722 that cover the end surfaces of the outer peripheral arc portion 53 positioned in the motor axial direction L at the outer peripheral arc portion 53 at positions facing the outer sides of the radial direction D with respect to the portions 711 and 721. ing.

  When viewed from the motor axial direction L, the projecting extreme surface covering portions 710 and 720, the inner peripheral side flange portions 711 and 721, and the outer peripheral side flange portions 712 and 722 are respectively end surfaces of the salient poles 51 and inner peripheral side arc portions 52. And has substantially the same shape as the end surface of the outer circumferential arc portion 53. That is, when viewed from the motor axial direction L, the end face of the salient pole 51 and the protruding extreme surface covering parts 710 and 720 are rectangular, and the end face of the inner peripheral side arc part 52 and the inner peripheral side collar parts 711 and 721 are arcuate. In addition, the end face of the outer circumferential arc portion 53 and the outer flange portions 712 and 722 are arcuate.

  More specifically, the end surface of the inner circumferential side arc portion 52 of the split core 50 is located on the inner side in the radial direction D and the inner peripheral edge facing the rotor magnet 85 has an arc shape and is located on the outer side in the radial direction D. The portion extends obliquely in a substantially straight line shape. In the 1st insulator 71 and the 2nd insulator 72, although the part located inside the radial direction D of the inner peripheral side collar parts 711 and 721 is the same circular arc shape as the inner peripheral edge of the inner peripheral side circular arc part 52 end surface. The portions of the inner peripheral side flanges 711 and 721 located outside the radial direction D extend linearly in a direction orthogonal to the direction in which the salient poles 51 extend (radial direction D). For this reason, the inner peripheral side flanges 711 and 721 have a shape in which the thickness in the radial direction D continuously increases toward both sides in the circumferential direction.

  On the other hand, the outer circumferential edge 53 of the split core 50 has an arcuate outer peripheral edge located on the outer side in the radial direction D, and the salient pole 51 extends on the inner peripheral edge located on the inner side in the radial direction D. It extends linearly in a direction orthogonal to the direction in which it is present. For this reason, the outer circumferential arc 53 has a shape in which the thickness in the radial direction D continuously decreases toward both sides in the circumferential direction. In the 1st insulator 71 and the 2nd insulator 72, although the part located in the outer side of the radial direction D of the outer peripheral side collar part 712,722 is circular, the inner side of the outer peripheral side collar part 712,722 in the radial direction D The portion located at is extended linearly in a direction orthogonal to the direction (radial direction D) in which the salient poles 51 extend. For this reason, in the 1st insulator 71 and the 2nd insulator 72, it is located inside the radial direction D of the outer peripheral side collar part 712,722 and the part located in the radial direction D outer side side collar part 711,721. The part is parallel. Moreover, the outer peripheral side collar parts 712 and 722 have a shape in which the thickness in the radial direction D continuously decreases toward both sides in the circumferential direction. In addition, the dimension in the radial direction D of the outer circumferential arc portion 53 of the split core 50 is slightly larger than the dimension in the radial direction D of the outer circumferential flanges 712 and 722. For this reason, the outer peripheral end portion of the outer peripheral side arc portion 53 protrudes from the outer peripheral side flange portions 712 and 722 to the outside in the radial direction D in a state where the outer peripheral side flange portions 712 and 722 cover the outer peripheral side arc portion 53. .

  Moreover, the dimension in the circumferential direction of the outer circumferential side arc portion 53 of the split core 50 is slightly larger than the dimension in the circumferential direction of the outer circumferential side flanges 712 and 722. For this reason, when the divided cores 50 are annularly arranged in the circumferential direction, the outer circumferential side arc portion 53 of the divided core 50 adjacent in the circumferential direction is surely in contact.

  In the 1st insulator 71 and the 2nd insulator 72 which were comprised in this way, the part pinched | interposed between the inner peripheral side collar part 711,721 and the outer peripheral side collar part 712,722 is dented in groove shape, and this depression The drive coil 6 is wound using the portion.

  Further, each of the first insulator 71 and the second insulator 72 has a salient pole side surface projecting in the motor axial direction L from the salient extreme surface covering portions 710 and 720 so as to cover the salient pole side surface 510 positioned in the circumferential direction on the salient pole 51. Covering parts 715, 725, inner peripheral side arcuate part covering parts 716, 726 projecting in the motor axial direction L from the inner peripheral side flange parts 711, 721 so as to cover the inner peripheral surface 520 of the inner peripheral side arc part 52, The outer peripheral side arcuate part 53 is provided with outer peripheral side arcuate part covering parts 717 and 727 protruding from the outer peripheral side flange parts 712 and 722 in the motor axial direction L so as to cover the inner peripheral surface 530 of the outer peripheral side arc part 53. Here, the salient pole side surface covering portions 715 and 725 and the outer circumferential side arc portion covering portions 717 and 727 are all thin plates. On the other hand, when viewed from the motor axial direction L, the inner circumferential arc portion covering portions 716 and 726 are substantially triangular with the bases facing both ends in the circumferential direction, similar to the shape of both end portions of the inner circumferential arc portion 52. It has a shape.

  Further, in the first insulator 71 and the second insulator 72, the inner end surface located on the inner side in the motor axial direction L in the outer peripheral side flanges 712 and 722 is formed at the root of the outer peripheral arc portion covering portions 717 and 727, which will be described later. Grooves 719 and 729 are formed in which the wide portion of the third insulator 73 is received.

  In the first insulator 71 and the second insulator 72 configured as described above, the salient pole side surface covering portions 715 and 725 are connected to the inner circumferential side arc portion covering portions 716 and 726 and the salient pole side surface covering portions 715 and 725 are connected. And the outer circumferential arc portion covering portions 717 and 727 are connected. For this reason, when viewed from the motor axial direction L, the inner peripheral side arc portion covering portions 716 and 726, the salient pole side surface covering portions 715 and 725, and the outer peripheral side arc portion covering portions 717 and 727 are U-shaped. . The drive coil 6 is wound so as to pass through the space surrounded by the inner circumferential side arc portion covering portions 716 and 726, the salient pole side surface covering portions 715 and 725, and the outer circumferential side arc portion covering portions 717 and 727. .

  The third insulator 73 is a substantially rectangular slot insulating paper, and covers the salient pole side surface 510, the inner peripheral surface 520 of the inner peripheral arc portion 52, and the inner peripheral surface 530 of the outer peripheral arc portion 53. When folded along the valley line of the book and viewed from the motor axial direction L, it has a U-shape. In the third insulator 73, portions 735, 736, and 737 that cover the salient pole side surface 510, the inner peripheral surface 520 of the inner peripheral arc portion 52, and the inner peripheral surface 530 of the outer peripheral arc portion 53 have dimensions in the motor axial direction L. (Width dimension) is equal to the dimension of the split core 50 in the motor axial direction L. Therefore, the salient pole side surface 510 of the split core 50, the inner peripheral surface 520 of the inner peripheral side arc portion 52, and the inner peripheral surface 530 of the outer peripheral side arc portion 53 are completely covered by the third insulator 73, and the circumferential direction Thus, in the portion close to the salient pole 51, the third insulator 73 does not protrude from both ends of the split core 50 in the motor axial direction L.

  However, in this embodiment, the third insulator 73 is provided with a protruding portion 738 that protrudes in both the circumferential direction and the motor axial direction L from the circumferential end of the outer circumferential arc portion 53 at the circumferential end. . More specifically, the circumferential end portion of the third insulator 73 covering the inner circumferential surface 530 of the outer circumferential arc portion 53 is stepped so that the dimension in the motor axial direction L is bidirectional in the motor axial direction L. The dimension in the motor axial direction L at the wide part is longer than the dimension in the motor axial direction L of the split core 50. Further, the length dimension in the circumferential direction when the third insulator 73 is deployed is such that the inner peripheral surface 520 of the inner peripheral arc portion 52, the salient pole side surface 510, and the outer peripheral arc portion 53 of the split core 50. It is set longer than the dimension required to cover 530.

  In holding the third insulator 73 on the split core 50, in this embodiment, both end portions of the third insulator 73 in the motor axial direction L are located between the salient pole side surface 510 and the salient pole side surface covering portions 715 and 725. Between the inner peripheral surface 520 of the peripheral arc portion 52 and the inner peripheral arc portion covering portions 716, 726, and between the inner peripheral surface 530 of the outer peripheral arc portion 53 and the outer peripheral arc portion covering portions 717, 727, respectively. In this case, the wafer is sandwiched with a large area.

  Here, the dimensions in the motor axial direction L of the inner peripheral side arc portion covering portions 716 and 726, the salient pole side surface covering portions 715 and 725, and the outer peripheral side arc portion covering portions 717 and 727 of the first insulator 71 and the second insulator 72 are described. Is shorter than the dimension required to cover the split core 50 in the entire motor axial direction L. For this reason, the first insulator 71 and the second insulator 72 include the ends of both salient pole side surface covering portions 715 and 725, the ends of both inner circumferential side arc portion covering portions 716 and 726, and both ends. The ends of the outer circumferential arc portion covering portions 717 and 727 are separated from each other in the motor axial direction L, and the third insulator 73 is exposed between them.

  Further, in the split core 50, the salient pole side surface 510, the inner peripheral surface 520 of the inner peripheral arc portion 52, and the inner peripheral surface 530 of the outer peripheral arc portion 53 are each a continuous flat surface having no step in the motor axial direction L. It has become. Therefore, on the surface of the third insulator 73, steps corresponding to the thicknesses of the salient pole side surface covering portions 715 and 725, the inner peripheral side arc portion covering portions 716 and 726, and the outer peripheral side arc portion covering portions 717 and 727 are provided. A portion 78 is formed. Therefore, the third insulator 73 is in a position recessed from the salient pole side surface covering portions 715 and 725, the inner peripheral side arc portion covering portions 716 and 726, and the outer peripheral side arc portion covering portions 717 and 727. Therefore, when the drive coil 6 is wound, the drive coil 6 is not in contact with the third insulator 73.

  In order to configure the stator 4 using the split core 50, the first insulator 71, the second insulator 72, and the third insulator 73 configured as described above, as shown in FIGS. After covering the salient pole side surface 510 of the split core 50, the inner peripheral surface 520 of the inner peripheral arc portion 52, and the inner peripheral surface 530 of the outer peripheral arc portion 53 with the three insulators 73, the split core 50 in the motor axial direction L is covered. The first insulator 71 and the second insulator 72 are covered from both sides. As a result, both end portions of the third insulator 73 in the motor axial direction L are between the salient pole side surface 510 and the salient pole side surface covering portions 715 and 725, the inner peripheral surface 520 of the inner peripheral arc portion 52, and the inner peripheral arc. It is sandwiched between the part covering parts 716 and 726 and between the inner peripheral surface 530 of the outer peripheral side arc part 53 and the outer peripheral side arc part covering parts 717 and 727.

  Here, the third insulator 73 is provided with a projecting portion 738 that projects in both the circumferential direction and the motor axial direction L from the circumferential end portion of the outer circumferential arc portion 53 at the circumferential end portion. For this reason, at the end portion of the third insulator 73 that covers the inner peripheral surface 530 of the outer peripheral arc portion 53, the wide portion in which the dimension in the motor axial direction L is bi-directionally expanded from the end surface of the split core 50. An axially extending portion 738 b that extends in a rectangular shape is formed outside the motor axial direction L, and the axially extending portion 738 b is accommodated in grooves 719 and 729 formed in the outer peripheral side flange portions 712 and 722. Further, in the third insulator 73, the projecting portion 738 forms a circumferential projecting portion 738 a projecting in the circumferential direction from a portion covering the outer circumferential arc portion 53. Therefore, on the inner peripheral surface of the outer peripheral arc portion 53 of the split core 50, the third insulator 73 overlaps the corner portions 535 located on both sides in the axial direction at the end in the circumferential direction with a margin.

  Next, as shown in FIG. 2, the drive coil 6 is wound around the salient pole 51 from above the first insulator 71, the second insulator 72, and the third insulator 73.

  Thereafter, the circumferentially extending portion 738a is bent inward in the radial direction D so as to cover the drive coil 6 after the drive coil 6 is wound.

  As shown in FIG. 1B, a plurality of divided cores 50 around which the drive coil 6 is wound are arranged in an annular shape in the circumferential direction, so that the stator core 5 and the stator 4 are configured.

(Main effects of this form)
As described above, in the motor 1 of the present embodiment, the third insulator 73 protrudes from the circumferential end of the outer circumferential arc portion 53 in both the circumferential direction and the motor axis L direction at the circumferential end. An overhang 738 is provided. For this reason, on the inner peripheral surface of the outer peripheral arc portion 53 of the split core 50, the protruding portion 738 of the third insulator 73 overlaps with corner portions 535 located on both sides in the motor axial direction L at the circumferential end with a margin. It becomes a state. Of the overhanging portion 738 of the third insulator 73, the axial overhanging portion 738 b partially overlaps with the first insulator 71 and the second insulator 72, and on the inner circumferential surface of the outer circumferential side arc portion 53 of the split core 50. The corner portions 535 located on both sides in the axial direction are reliably covered at the end portions in the circumferential direction. Accordingly, the split core 50 does not have a portion exposed from the first insulator 71, the second insulator 72, and the third insulator 73 in the vicinity of the drive coil 6, so that high insulation is provided between the split core 50 and the drive coil 6. A breakdown voltage can be ensured reliably.

  Further, in this embodiment, since the grooves 719 and 729 for accommodating the axially extending portion 738b are formed in the outer peripheral side flange portions 712 and 722, the motor axis L from the split core 50 in the protruding portion 738 of the third insulator 73 is formed. The axially protruding portion 738b protruding in the direction can also be fixed.

  Furthermore, a circumferential projecting portion 738 a projecting from the split core 50 in the projecting portion 738 of the third insulator 73 is bent in the radial direction D so as to cover the drive coil 6. For this reason, the withstand voltage of the drive coil 6 in the circumferential direction is high.

  Further, the first insulator 71 and the second insulator 72 are inner surfaces that cover the salient pole side surface covering portions 715 and 725 covering the salient pole side surface 510 of the split core 50 and the inner peripheral surface 520 of the inner peripheral arc portion 52 of the split core 50. The third insulator 73 includes a salient pole side surface 510 and outer circumferential side arc portion covering portions 717 and 727 that cover the circumferential arc portion covering portions 716 and 726 and the inner peripheral surface 530 of the outer peripheral arc portion 53 of the split core 50. Between the salient pole side covering portions 715 and 725, between the inner peripheral surface 520 and the inner peripheral arc portion covering portions 716 and 726 of the inner peripheral arc portion 52, and between the inner peripheral surface 530 and the outer periphery of the outer peripheral arc portion 53. It is sandwiched between the side arcuate portion covering portions 717 and 727. For this reason, the 3rd insulator 73 can be fixed reliably. Accordingly, it is possible to reliably prevent the third insulator 73 from shifting when the drive coil 6 is wound.

  Further, the third insulator 73 has both end portions in the motor axial direction L between the salient pole side surface 510 and the salient pole side surface covering portions 715 and 725, and the inner circumference surface 520 and inner circumference of the inner circumference side arc portion 52. Since it is clamped in a wide area at three locations between the side arc portion covering portions 716 and 726 and between the inner peripheral surface 530 of the outer periphery side arc portion 53 and the outer periphery side arc portion covering portions 717 and 727, There will be no great force applied. Therefore, there is no possibility that the third insulator 73 is broken and the withstand voltage is reduced, so that the yield and reliability of the motor 1 can be improved.

  The salient pole side surface covering portions 715 and 725 are connected to the inner circumferential side arc portion covering portions 716 and 726, and the salient pole side surface covering portions 715 and 725 and the outer peripheral side arc portion covering portions 717 and 727 are connected. Therefore, the salient pole side surface covering portions 715 and 725, the inner peripheral side arc portion covering portions 716 and 726, and the outer peripheral side arc portion covering portions 717 and 727 are formed in a thin plate shape in order to secure a large winding space for the drive coil 6. Even if formed, the salient pole side surface covering portions 715 and 725, the inner peripheral side arc portion covering portions 716 and 726, and the outer peripheral side arc portion covering portions 717 and 727 are appropriately restrained from each other. Therefore, the salient pole side surface covering portions 715 and 725, the inner peripheral side arc portion covering portions 716 and 726, and the outer peripheral side arc portion covering portions 717 and 727 have appropriate rigidity, so that the third insulator 73 is securely held. Can do.

  In particular, in this embodiment, the split core 50 uses the split core 50 in which the inner peripheral flange portions 711 and 721 and the outer peripheral flange portions 712 and 722 are divided for each salient pole 51. Therefore, the circumferential direction of the third insulator 73 However, according to the present embodiment, even when the split core 50 is used, the third insulator 73 is not displaced. Even when the third insulator 73 is slightly deviated, the overhanging portion 738 is formed on the third insulator 73, so that high insulation is provided between the drive coil 6 and the outer peripheral side flange portions 712 and 722 of the split core 50. A breakdown voltage can be secured.

  Furthermore, the 1st insulator 71 and the 2nd insulator 72 are the ends of both salient pole side surface covering parts 715 and 725, the ends of both inner peripheral side arc part covering parts 716 and 726, and the outer periphery of both. The end portions of the side arc portion covering portions 717 and 727 are separated from each other in the motor axial direction L, and the third insulator 73 is exposed therebetween. Therefore, between the first insulator 71 and the second insulator 72, the ends of both salient pole side surface covering portions 715, 725, the ends of both inner circumferential side arc portion covering portions 716, 726, and Since the ends of the outer circumferential arc portion covering portions 717 and 727 do not overlap with each other, no extra step is generated even if the dimensional accuracy is low. In addition, since the dimensions of the salient pole side surface covering portions 715 and 725, the inner peripheral side arc portion covering portions 716 and 726, and the outer peripheral side arc portion covering portions 717 and 727 in the motor axial direction L can be shortened, the first insulator 71 and the first insulator 71 When the two insulators 72 are molded, there is an advantage that high accuracy can be obtained in shape and dimensions.

  Further, although the third insulator 73 is exposed between the first insulator 71 and the second insulator 72, the salient pole side surface 510, the inner peripheral surface 520 of the inner peripheral arc portion 52, and the outer peripheral arc portion 53. Since each of the inner peripheral surfaces 530 is a continuous flat surface having no step in the motor axial direction L, the salient pole side surface covering portions 715 and 725 and the inner peripheral side arc portion covering are formed on the surface of the third insulator 73. Stepped portions 78 corresponding to the thicknesses of the portions 716 and 726 and the outer circumferential arc portion covering portions 717 and 727 are formed. That is, in this embodiment, since the third insulator 73 is clamped in a wide area, there is no possibility that the withstand voltage will be reduced due to tearing, so that the portion where the third insulator 73 is pressed and fixed is recessed in the split core 50. There is no need. Therefore, since it is not necessary to perform extra processing such as forming a recess in the split core 50, productivity can be improved and the third insulator 73 can be securely fixed. Further, since the drive coil 6 does not directly contact the third insulator 73, the third insulator 73 is not damaged when the drive coil 6 is wound, so that the yield and reliability of the motor 1 can be improved.

  Furthermore, in this embodiment, in addition to the first insulator 71 and the second insulator 72, insulation is ensured by using the third insulator 73, and both the salient pole side surfaces are covered in the first insulator 71 and the second insulator 72. The ends of the parts 715 and 725 are spaced apart from each other in the motor axial direction L between the ends of the inner circular arc covering parts 716 and 726 and the outer circular arc covering parts 717 and 727. Therefore, even if the axial length of the split core 50 changes for each model, the axial dimension of the third insulator 73 may be changed, and the salient pole side surface covering portions 715 and 725, the inner circumferential arc It is not necessary to change the dimensions of the portion covering portions 716 and 726 and the outer circumferential arc portion covering portions 717 and 727. That is, according to this embodiment, since the common first insulator 71 and second insulator 72 can be used for the split cores 50 having different axial lengths, the cost can be reduced.

(Embodiment of the present invention )
In the above embodiment, when the projecting portion 738 is formed on the third insulator 73, the dimension in the motor axial direction L is bidirectional in the motor axial direction L at the end of the outer peripheral arc portion 53 covering the inner peripheral surface 530. In the motor to which the present invention is applied, as shown in FIG. 4, the dimension in the motor axial direction L is set to the motor axial direction L with respect to the end of the third insulator 73. The overhanging portion 738 is formed by a wide portion continuously expanded in both directions. In this case, since the triangular axially extending portion 738b is formed, the depths of the grooves 719 and 729 that accommodate the axially extending portion 738b in the outer peripheral side flange portions 712 and 722 are set to the triangular axis line. If matched to the direction overhanging portion, even a triangular axial overhanging portion can be fixed in the groove. Since other configurations are the same as the configurations described with reference to FIGS. 1 to 3, common portions are denoted by the same reference numerals and description thereof is omitted.

(Other embodiments)
In the above embodiment, the present invention is applied to the inner rotor type motor 1 in which the stator core 5 is formed by the plurality of divided cores 50. However, the outer rotor type motor 1 in which the stator core 5 is formed by the plurality of divided cores 50 is used. The present invention may be applied to this. Moreover, in the said form, although the stator core 5 was formed with the some division | segmentation core 50, you may apply this invention to the outer rotor type motor 1 which formed the stator core 5 integrally. In this case, a configuration in which the inner peripheral side flanges 711 and 721 are connected is employed.

(A), (b) is the longitudinal cross-sectional view and transverse cross-sectional view of the motor to which this invention is applied, respectively. It is a perspective view of the division | segmentation core used for the motor which concerns on the reference example of this invention. (A), (b) is an exploded perspective view of the division | segmentation core shown in FIG. 2, respectively, and a perspective view which shows the mode before winding a drive coil, after attaching an insulator to a division | segmentation core. It is explanatory drawing of the 3rd insulator used for the motor to which this invention is applied. It is explanatory drawing of the conventional motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 5 Stator core 6 Drive coil 8 Rotor 50 Divided core 51 Salient pole 52 Inner circumference side arc part 53 Outer circumference side arc part 71 First insulator 72 Second insulator 73 Third insulator 535 Split core corner part 738 Overhang of the third insulator Part 738a Circumferentially overhanging part 738b Axial overhanging part

Claims (5)

A stator core having outer circumferential arc portions extending from both outer circumferential ends of a plurality of salient poles projecting in the radial direction to both sides in the circumferential direction, and a drive coil wound around the salient poles via an insulator A stator,
A rotor provided with a rotor magnet opposed to the tip of the salient pole via a predetermined gap;
In a motor having
The insulator is positioned on both sides of the salient pole in the circumferential direction, a first insulator that covers one end of the stator core in the motor axial direction, a second insulator that covers the other end of the stator core in the motor axial direction, and A pair of sheet-like third insulators covering the salient pole side surface and the inner peripheral surface located radially inward on the outer circumferential arc portion on both sides in the circumferential direction of the salient pole,
The third insulator includes a projecting portion that projects in the motor axial direction from the circumferential end of the outer circumferential arc portion ,
The first insulator and the second insulator are formed with a groove for accommodating the protruding portion,
The motor is characterized in that the projecting portion is formed by a wide portion continuously extended in the motor axial direction from the inner side in the circumferential direction covering the side surface of the salient pole to the outer side in the circumferential direction .   2. The motor according to claim 1, wherein in the third insulator, the projecting portion projects in a circumferential direction from a circumferential end portion of the outer circumferential arc portion.   The motor according to claim 2, wherein a portion of the projecting portion that projects in the circumferential direction is bent inward in the radial direction so as to cover the drive coil.   4. The motor according to claim 1, wherein the stator core includes a plurality of divided cores in which the outer circumferential arc portion is divided for each salient pole in the circumferential direction. 5. 5. The first insulator and the second insulator are configured such that end portions in the motor axial direction are separated from each other in the motor axial direction, and the third insulator is exposed therebetween. The motor according to any one of the above.

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