JP6525713B2 - motor - Google Patents

Description

  The present invention relates to a motor in which a stator core and a stator coil are resin-molded.

  In the motor, as a configuration for efficiently dissipating the heat generated by the stator coil wound around the salient pole of the stator core, a configuration in which the stator core and the stator coil are molded with resin has been proposed. According to this configuration, the heat generated in the stator coil can be released to the metal core holder holding the stator core inside through the mold resin portion. In the stator having such a structure, for example, a stator core obtained by winding a stator coil is accommodated in a mold, and resin is filled from one side to the other side in the axial direction in this state, and the stator coil and the stator core are molded with resin. Do. Thereafter, the stator core is fixed in the core holder. In addition, the stator core formed by winding the stator coil is accommodated in the core holder, resin is filled from one side to the other side in the axial direction in this state, and the stator coil and the stator core are molded with resin (see Patent Document 1) .

JP, 2014-7801, A

  In any of the above methods, the resin filled from one side in the axial direction passes through the slot of the stator core to reach the other side in the axial direction, and covers the stator coil on the other side in the axial direction of the stator. However, since the stator coil wound around the salient pole is located in the slot of the stator core, the inside of the slot is narrow. Therefore, the resin filled from one side in the axial direction may not reach the other side in the axial direction. In such a case, the stator coil can not be covered with the mold resin on the other side in the axial direction. As a result, on the other side in the axial direction, there is a problem that the heat generated in the stator coil can not be dissipated efficiently.

  In view of the above problems, it is an object of the present invention to provide a motor capable of efficiently dissipating heat generated by a stator coil on either one side or the other side in the axial direction of the stator.

In order to solve the above-mentioned subject, one mode of the motor concerning the present invention has a rotor and a cylindrical stator which surrounds this rotor radially outside, and the above-mentioned stator is annular ring part and this annular ring. A stator core having a plurality of salient poles projecting radially inward from a portion, a stator coil wound around each of the plurality of salient poles, and a cylindrical shape holding the stator core in contact with the stator core from outside in the radial direction And the molded resin portion covering the stator coil and the stator core inside the core holder, and the outer peripheral surface of the stator core is an end from one end of the stator core in the axial direction to the other end A groove-shaped recess extending to a portion, and the mold resin portion is a first portion covering the stator coil on the one side in the axial direction of the stator core; A second portion covering the stator coil on the other side in the axial direction of the motor core, and a third portion connected to the first portion and the second portion inside the groove-like recess, the first portion And at least one of the second portions is in contact with the inner peripheral surface of the core holder, and the stator coil is wound around the salient pole through an insulating member disposed to overlap with an axial end of the stator core And the insulating member projects from the radially outer portion of the end plate portion to the side opposite to the stator core in the axial direction from the end plate portion overlapping the salient pole in the axial direction, and winding the stator coil. The winding range of the stator coil is restricted on the radially inner side by projecting from the radial inner end of the end plate part to the side opposite to the stator core in the axial direction from the outer side plate part that restricts the range on the radial outer side Inside plate And a first concave portion recessed toward the side where the stator core is located is formed at an end portion of the outer side plate portion located on the opposite side to the axial direction of the stator core in the outer side plate portion. The radially outer surface is characterized in that a second concave portion recessed toward the radially inner side is formed .

  In the present invention, the outer peripheral surface of the stator core is formed with a groove-shaped recess extending from one end of the stator core in the axial direction to the other end, so from one side or the other side in the axial direction The filled mold resin passes through the inside of the groove-like recess of the stator core and reaches the axially opposite side. Therefore, in the mold resin portion, the first portion covers the stator coil on one side in the axial direction of the stator core, and the second portion covers the stator coil on the other side in the axial direction of the stator core. Therefore, the heat generated by the stator coil can be efficiently dissipated to the first and second portions of the mold resin portion, and the heat transferred from the stator coil to the mold resin portion can be efficiently dissipated through the stator core and the core holder. Can. Further, since at least one of the first portion and the second portion of the mold resin portion is in contact with the inner peripheral surface of the core holder, the heat transmitted from the stator coil to the mold resin portion can be efficiently dissipated to the core holder.

Further, the resin for molding supplied from one side or the other side in the axial direction of the stator core flows radially outward of the outer side plate portion through the first concave portion of the outer side plate portion, and axially through the grooved concave portion. It is easy to reach the other side.

Further, when the resin for mold supplied from one side or the other side in the axial direction of the stator core flows through the first concave portion of the outer side plate portion radially outward of the outer side plate portion, the grooved shape through the second concave portion Easy to flow into the recess. For this reason, the resin for molding is likely to reach the opposite side in the axial direction through the grooved recess.

In the present invention, preferably, the first recess and the second recess are provided at the same angular position as the groove-like recess. According to this configuration, the resin for mold supplied from the one side or the other side in the axial direction of the stator core can easily flow to the groove-like recess through the first recess and the second recess of the outer plate portion. For this reason, the resin for molding is likely to reach the opposite side in the axial direction through the grooved recess.

In the present invention, the insulating member is provided with a plate-like protruding portion which protrudes outward in the radial direction from the outer side plate portion and overlaps the annular portion, and the groove on the radially outer end of the plate-like protruding portion It is preferable to adopt an aspect in which a third recess which is recessed radially inward at the same angular position as the recess is formed. According to this configuration, even when the plate-like protrusion of the insulating member overlaps the annular portion, the groove-like recess is opened toward the one side and the other side in the axial direction by the third recess. Therefore, the molding resin can easily flow into the groove-shaped recess from one side or the other side in the axial direction of the stator core.

In the present invention, in the inner plate portion, the circumferential length of a portion overlapping in the axial direction with the radial inner end of the salient pole is shorter than the circumferential length of the radial inner end of the salient pole preferable. According to this configuration, the resin for molding supplied from one side or the other side in the axial direction of the stator core can easily reach the opposite side in the axial direction through between the adjacent inner plate portions in the circumferential direction.

Another aspect of the motor according to the present invention includes a rotor and a cylindrical stator surrounding the rotor radially outward, and the stator protrudes radially inward from an annular portion and the annular portion. A stator core having a plurality of salient poles, a stator coil wound around each of the plurality of salient poles, a cylindrical core holder holding the stator core in contact with the stator core from outside in the radial direction, and an inner side of the core holder And a molded resin portion covering the stator coil and the stator core, and a groove-like recess extending from one end of the stator core in the axial direction to the other end on the outer peripheral surface of the stator core The mold resin portion is formed of a first portion that covers the stator coil on the one side in the axial direction of the stator core, and the axial direction of the stator core. A second portion covering the stator coil on one side, and a third portion connected to the first portion and the second portion inside the groove-like recess, and the first portion and the second portion At least one of the stator coils is in contact with the inner peripheral surface of the core holder, and the stator coil is wound around the salient pole through an insulating member disposed in an axial direction of the stator core in an overlapping manner. The member projects from an end plate portion axially overlapping the salient pole in the axial direction, and from the radial outer side portion of the end plate portion in the axial direction opposite to the stator core in the axial direction and in the circumferential direction to make a winding range of the stator coil The winding direction of the stator coil is restricted from the radially inner side by protruding from the radial direction inner end of the end plate part to the outer side plate part and the circumferential direction opposite to the stator core in the axial direction Inner plate part The provided, in the radially outer surface of the outer plate portion is characterized in that a second recess recessed toward the radially inward is formed. According to this configuration, when the mold resin supplied from one side or the other side in the axial direction of the stator core flows outward in the radial direction of the outer plate portion, it easily flows into the grooved recess through the second recess. For this reason, the resin for molding tends to reach the opposite side in the axial direction through the groove-like recess.

  Another aspect of the motor according to the present invention includes a rotor and a cylindrical stator surrounding the rotor radially outward, and the stator protrudes radially inward from an annular portion and the annular portion. A stator core having a plurality of salient poles, a stator coil wound around each of the plurality of salient poles, a cylindrical core holder holding the stator core in contact with the stator core from outside in the radial direction, and an inner side of the core holder And a molded resin portion covering the stator coil and the stator core, and a groove-like recess extending from one end of the stator core in the axial direction to the other end on the outer peripheral surface of the stator core The mold resin portion is formed of a first portion that covers the stator coil on the one side in the axial direction of the stator core, and the axial direction of the stator core. A second portion covering the stator coil on one side, and a third portion connected to the first portion and the second portion inside the groove-like recess, and the first portion and the second portion At least one of the stator coils is in contact with the inner peripheral surface of the core holder, and the stator coil is wound around the salient pole through an insulating member disposed in an axial direction of the stator core in an overlapping manner. The member projects from an end plate portion axially overlapping the salient pole in the axial direction, and from the radial outer side portion of the end plate portion in the axial direction opposite to the stator core in the axial direction and in the circumferential direction to make a winding range of the stator coil The winding direction of the stator coil is restricted from the radially inner side by protruding from the radial direction inner end of the end plate part to the outer side plate part and the circumferential direction opposite to the stator core in the axial direction Inner plate part And a plate-like protruding portion that protrudes radially outward from the outer side plate portion and overlaps the annular portion, and an end portion of the plate-like protruding portion on the radially outer side has the same angle as the groove-like recess. It is characterized in that a third recess which is recessed radially inward at the position is formed. According to this configuration, even when the plate-like protrusion of the insulating member overlaps the annular portion, the third recess allows the groove-like recess to be directed to one side and the other side in the axial direction.
It will be open. Therefore, the resin for mold supplied from one side or the other side in the axial direction of the stator core is likely to flow into the groove-like recess.

Another aspect of the motor according to the present invention includes a rotor and a cylindrical stator surrounding the rotor radially outward, and the stator protrudes radially inward from an annular portion and the annular portion. A stator core having a plurality of salient poles, a stator coil wound around each of the plurality of salient poles, a cylindrical core holder holding the stator core in contact with the stator core from outside in the radial direction, and an inner side of the core holder And a molded resin portion covering the stator coil and the stator core, and a groove-like recess extending from one end of the stator core in the axial direction to the other end on the outer peripheral surface of the stator core The mold resin portion is formed of a first portion that covers the stator coil on the one side in the axial direction of the stator core, and the axial direction of the stator core. A second portion covering the stator coil on one side, and a third portion connected to the first portion and the second portion inside the groove-like recess, and the first portion and the second portion At least one of the stator coils is in contact with the inner peripheral surface of the core holder, and the stator coil is wound around the salient pole through an insulating member disposed in an axial direction of the stator core in an overlapping manner. The member projects from an end plate portion axially overlapping the salient pole in the axial direction, and from the radial outer side portion of the end plate portion in the axial direction opposite to the stator core in the axial direction and in the circumferential direction to make a winding range of the stator coil The winding direction of the stator coil is restricted from the radially inner side by protruding from the radial direction inner end of the end plate part to the outer side plate part and the circumferential direction opposite to the stator core in the axial direction Inner plate part A circumferential length of a portion of the inner plate portion overlapping the radially inner end portion of the salient pole at the inner plate portion; and a plate-like projecting portion protruding radially outward from the outer plate portion and overlapping the annular portion. Is shorter than the circumferential length of the radial inner end of the salient pole. According to this configuration, the resin for molding supplied from one side or the other side in the axial direction of the stator core can easily reach the opposite side in the axial direction through between the adjacent inner plate portions in the circumferential direction.

In the present invention, the stator core may be a split core divided into a plurality of pieces in the circumferential direction, and the insulating member may be provided for each of the split cores.

In the present invention, the mold resin portion covers the stator coil in a slot sandwiched by the adjacent salient poles in the circumferential direction among the plurality of salient poles and is connected to the first portion and the second portion. It is preferred to have a fourth part. That is, the resin for mold supplied from one side or the other side in the axial direction passes through the slot of the stator core to reach the opposite side in the axial direction. Therefore, in the mold resin portion, the first portion covers the stator coil on one side in the axial direction of the stator core, and the second portion on the other side in the axial direction of the stator core
Cover the data coil. In addition, heat generated by the stator coil in the slot can be efficiently dissipated through the mold resin portion

In the present invention, preferably, the first portion and the second portion are in contact with the inner peripheral surface of the core holder. According to this configuration, the heat transferred from the stator coil to the mold resin portion can be efficiently dissipated to the core holder.

In the present invention, preferably, the first part, the second part and the third part are in contact with the inner peripheral surface of the core holder. According to this configuration, the heat transferred from the stator coil to the mold resin portion can be efficiently dissipated to the core holder.

In the present invention, the groove-shaped recess and the salient pole are preferably provided at the same angular position of the stator core. According to this configuration, even when the groove-like recess is formed in the stator core, the magnetic path can be properly formed.

In the present invention, it is preferable that the groove-shaped recess has a circumferential dimension smaller from the side of the opening edge located radially outward to the bottom located radially inward. According to this configuration, even when the groove-like recess is formed in the stator core, the magnetic path can be properly formed.

In the present invention, the mold resin portion is made of a resin filled from the one side or the other side in the axial direction in a state where the stator core obtained by winding the stator coil around the salient pole is provided inside the core holder. Is preferred. According to this configuration, since the mold resin portion and the inner circumferential surface of the core holder can be in close contact with each other, heat can be efficiently conducted from the mold resin portion to the core holder.

  In the present invention, the outer peripheral surface of the stator core is formed with a groove-shaped recess extending from one end of the stator core in the axial direction to the other end, so from one side or the other side in the axial direction The filled mold resin passes through the inside of the groove-like recess of the stator core and reaches the axially opposite side. Therefore, in the mold resin portion, the first portion covers the stator coil on one side in the axial direction of the stator core, and the second portion covers the stator coil on the other side in the axial direction of the stator core. Therefore, the heat generated by the stator coil can be efficiently dissipated to the first and second portions of the mold resin portion, and the heat transferred from the stator coil to the mold resin portion can be efficiently dissipated through the stator core and the core holder. Can. Further, since at least one of the first portion and the second portion of the mold resin portion is in contact with the inner peripheral surface of the core holder, the heat transmitted from the stator coil to the mold resin portion can be efficiently dissipated to the core holder.

It is the perspective view which saw the motor to which this invention is applied from the output side. It is sectional drawing which shows a mode that the motor to which this invention was applied was cut | disconnected in the position which passes along a motor axis line. It is an exploded perspective view of a motor to which the present invention is applied. It is a perspective view in the state where a stator core etc. were removed from a core holder in a stator used for a motor to which the present invention is applied. FIG. 5 is a perspective view of a part of the stator core shown in FIG. 4 in the circumferential direction, viewed from the outside in the radial direction. FIG. 5 is a perspective view of a part of the stator core shown in FIG. 4 in the circumferential direction as viewed from the inner side in the radial direction. It is explanatory drawing of the electric power feeding part of the motor to which this invention is applied. It is explanatory drawing of the mold resin part provided in the motor to which this invention is applied.

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

(overall structure)
FIG. 1 is a perspective view of the motor 1 to which the present invention is applied as viewed from the output side, and FIGS. 1A and 1B are perspective views of the entire motor 1 and a state in which the feeding portion 8 is removed from the motor body. FIG. FIG. 2 is a cross-sectional view showing a state in which the motor 1 to which the present invention is applied is cut at a position passing through the motor axis. FIG. 3 is an exploded perspective view of a motor 1 to which the present invention is applied. In FIG. 3, the mold resin portion 7 is not shown.

  The motor 1 shown in FIGS. 1, 2 and 3 is a permanent magnet type synchronous motor. The motor 1 has a rotor 2 and a cylindrical stator 3 surrounding the rotor 2 radially outward, and the rotor 2 has a rotation shaft 20 extending in an axial direction L (motor axial direction), and a rotation A cylindrical rotor core 22 fixed around an axis 20 and a rotor magnet 23 fixed to the outer peripheral surface of the rotor core 22 are provided. In the present embodiment, the rotor magnet 23 is made of a rare earth magnet, and the rotor core 22 is made of an iron-based metal.

  The stator 3 is in contact with the stator core 5, described later with reference to FIGS. 4, 5 and 6, the stator coil 6 wound around each of the plurality of salient poles 51 of the stator core 5, and the stator core 5 from the radial direction outer side. And the cylindrical core holder 4 for holding the stator core 5, and the core holder 4 constitutes a motor case. The core holder 4 is made of metal, and in the present embodiment, the core holder 4 is made of aluminum. The core holder 4 has a substantially rectangular outer peripheral side, but has a cylindrical inner side. On the outer peripheral surface of the core holder 4, fins 48 for heat dissipation are formed. Further, an insulating first coating 39 is formed on the outer peripheral surface of the core holder 4. In the present embodiment, the first coating 39 is a black coating. The core holder 4 having such a configuration is manufactured, for example, by electrodeposition coating after manufacturing the core holder 4 and thereafter removing the first coating film 39 from a predetermined position by post-processing. In the present embodiment, the stator 3 has a molded resin portion 7 (see FIG. 2) that covers the stator coil 6 and the stator core 5 inside the core holder 4.

  A first plate 11 is fixed to an end on the output side of the core holder 4 in the axial direction L, and a first bearing 16 for rotatably supporting the rotating shaft 20 is held by the first plate 11. In this embodiment, the first plate 11 is directed from the outer edge of the end plate portion 111 to the non-output side with the substantially rectangular end plate portion 111 in which the through hole 110 for causing the rotary shaft 20 to project toward the output side is formed. And the inner peripheral side cylindrical portion 113 that protrudes toward the opposite output side radially inward from the outer peripheral side cylindrical portion 112, and the inner peripheral side cylindrical portion 113 and the rotation shaft A first bearing 16 consisting of a ball bearing is provided between the two. At the end on the non-output side of the outer peripheral side cylindrical portion 112, a step portion 114 is formed which causes the radially inner portion to protrude to the non-output side. The first plate 11 is fixed to the core holder 4 by screws in a state in which the step portion 114 is fitted inside the core holder 4. The first plate 11 is made of a metal material such as aluminum, and an insulating coating 119 similar to the first coating 39 is formed on the outer peripheral surfaces of the end plate portion 111 and the outer peripheral side cylindrical portion 112 and around the through hole 110. Is formed. However, the end face of the one side L1 of the end plate portion 111, etc. avoids reduction in dimensional accuracy due to the coating film 119 in a portion which becomes a positioning surface when the motor 1 is mounted on a motor device (not shown). From the viewpoint of that, the coating film 119 is not formed. The first plate 11 having such a configuration is manufactured, for example, by electrodeposition coating after manufacturing the first plate 11, and thereafter removing the coating film 119 from a predetermined position by post-processing.

The second plate 12 is fixed to the end on the non-output side in the axial direction L of the core holder 4, and the encoder cover 99 is fixed to the non-output side of the second plate 12. The second plate 17 holds a second bearing 17 that rotatably supports the rotating shaft 20. In the present embodiment, the second plate 12 protrudes from the outer edge of the end plate portion 121 toward the output side from the substantially rectangular end plate portion 121 in which the through hole 120 for causing the rotary shaft 20 to protrude to the reverse output side is formed. And an inner peripheral side cylindrical portion 123 protruding toward the opposite side with respect to the outer peripheral side cylindrical portion 122 in the radial direction, and the inner peripheral side cylindrical portion 123 and the rotary shaft 20 are provided. Between the two, a second bearing 17 consisting of a ball bearing is provided. At the end of the output side of the outer peripheral side cylindrical portion 122, a step portion 124 is formed which causes the radially inner portion to protrude toward the output side. The second plate 12 is fixed to the core holder 4 with a screw in a state in which the step portion 124 is fitted inside the core holder 4. The second plate 12 is made of a metal material such as aluminum, and an insulating coating 129 similar to the first coating 39 is formed on the outer peripheral surfaces of the end plate portion 121 and the outer peripheral side cylindrical portion 122. The coating film 129 is also formed by electrodeposition coating, similarly to the first coating film 39 and the coating film 119.

  Inside the encoder cover 99, an encoder 9 for detecting the rotational position of the rotating shaft 20 is provided. In this embodiment, the encoder 9 is a magnetic type, and the sensor magnet 92 attached to the end on the reverse output side of the rotating shaft 20 via the magnet holder 91 and the MR facing the sensor magnet 92 on the reverse output side And a magnetosensitive element 93 such as an element. The magnetosensitive element 93 is held by a sensor substrate 94, and the sensor substrate 94 is fixed to a sensor cover 98 fixed to the second plate 12. On the side surface of the encoder cover 99, a sensor output connector 97 for outputting the detection result of the encoder 9 is provided. In the present embodiment, the encoder cover 99 is made of black resin.

(Configuration of stator 3)
FIG. 4 is a perspective view of the stator 3 used in the motor 1 to which the present invention is applied, in a state in which the stator core 5 and the like are removed from the core holder 4. 5 is a perspective view of a part of the circumferential direction of the stator core 5 shown in FIG. 4 as viewed from the outside in the radial direction, and FIGS. 5 (a) and 5 (b) are perspective views of the stator core 5 with the insulating member attached. , And a perspective view of the stator core 5 with the insulating member removed. 6 is a perspective view of a part of the circumferential direction of the stator core 5 shown in FIG. 4 viewed from the inner side in the radial direction, and FIGS. 6 (a) and 6 (b) are perspective views of the stator core 5 with the insulating member attached. , And a perspective view of the stator core 5 with the insulating member removed.

  As shown in FIG. 4, FIG. 5 and FIG. 6, in the stator 3 used in the motor 1 of the present embodiment, the stator core 5 comprises an annular portion 56 and a plurality of salient poles projecting radially inward from the annular portion 56 It has 51 and. In this embodiment, the stator core 5 is composed of a plurality of divided cores 50 in which the annular portion 56 is divided in the circumferential direction for each salient pole 51, and the divided cores 50 include the salient pole 51 and the radial direction of the salient pole 51. And an outer circumferential arc portion 54 projecting in an arc shape on both sides in the circumferential direction from the outer end portion of The stator core 5 (split core 50) is formed of a laminated core in which a plurality of silicon steel plates are laminated.

  The salient pole 51 has a body portion 52 extending in the radial direction, and an inner circumferential arc portion 53 projecting from both ends in the radial direction of the body portion 52 in the radial direction. The divided cores 50 configured in this manner are fixed by shrink fitting to the inside of the core holder 4 in a state where the plurality of divided cores 50 are arranged in the circumferential direction. At that time, the outer circumferential arcs 54 of the split cores 50 adjacent in the circumferential direction are in contact with each other to form the annular portion 56. Further, the inner circumferential arc portions 53 of the split cores 50 adjacent in the circumferential direction are in contact with each other, and the inner circumferential surface 30 of the stator 3 is configured.

Here, a convex portion 541 extending over the entire axial direction L is formed at one circumferential end of the outer circumferential arc portion 54, and the other circumferential end of the outer circumferential arc portion 54 is formed. Is formed with a recess 542 extending over the entire axial direction L. For this reason, the convex portion 541 formed on the outer circumferential arc portion 54 of the split core 50 fits into the concave portion 542 formed on the outer circumferential arc portion 54 of the split core 50 adjacent on one side in the circumferential direction. The convex part 541 formed in the outer peripheral side arc part 54 of the division core 50 adjacent on the other side of the circumferential direction fits in the recessed part 542 formed in the outer peripheral side arc part 54 of 50. As shown in FIG.

  In this embodiment, the outer circumferential surface of the annular portion 56 (the outer circumferential arc portion 54 of the split core 50) of the stator core 5 extends from the end of one side L1 of the axial direction L of the stator core 5 to the other end A groove-shaped recess 55 is formed. In the present embodiment, the groove-shaped recess 55 and the salient pole 51 are provided at the same angular position (center in the circumferential direction) of the stator core 5. Further, as shown in FIG. 5B, the groove-like recess 55 has a circumferential dimension smaller from the opening edge 551 located radially outward toward the bottom portion 552 located radially inward.

(Configuration of insulating member)
As shown in FIGS. 5 and 6, in winding the stator coil 6 around the stator core 5, the first insulating member 61 is provided at the end of one side L1 of the stator core 5 (split core 50) in the axial direction L. The second insulating member 62 is overlapped on the end of the other side L2 of the stator core 5 (split core 50) in the axial direction L, and the stator coil 6 is wound around the salient pole 51 in this state. At that time, it is preferable to interpose an insulating sheet (not shown) between the stator core 5 and the first insulating member 61 and between the stator core 5 and the second insulating member 62. The first insulating member 61 and the second insulating member 62 have the same configuration, and are disposed so as to overlap the stator core 5 while reversing the direction. Therefore, hereinafter, the configuration of the first insulating member 61 will be mainly described, and the description of the second insulating member 62 will be omitted. In the present embodiment, the first insulating member 61 and the second insulating member 62 are made of a resin material such as PET (polyethylene terephthalate).

  The first insulating member 61 projects from the end plate portion 63 overlapping the salient pole 51 in the axial direction L and the opposite side to the stator core 5 in the axial direction L from the radially outer portion of the end plate portion 63. The winding range of the stator coil 6 is projected in the radial direction from the outer plate portion 64 which regulates the winding range in the radial direction outer side and the opposite side to the stator core 5 in the axial direction L from the radial inner end of the end plate portion 63. And an inner plate portion 65 that regulates the inner side. Further, the first insulating member 61 has plate portions 60 overlapping the side surfaces of the salient pole 51 on both sides in the circumferential direction of the end plate portion 63.

  At the end of the outer side plate portion 64 opposite to the stator core 5 in the axial direction L, the stator core 5 is provided in addition to the groove 69 for passing the winding start line and the winding end line of the stator coil 6. A first recess 66 recessed toward the side where it is located is formed. Further, on the radially outer surface of the outer side plate portion 64, a second concave portion 67 recessed toward the inner side in the radial direction is formed. In the present embodiment, the first recess 66 and the second recess 67 are provided at the same angular position (center in the circumferential direction) as the groove-like recess 55.

  Further, the first insulating member 61 is provided with a plate-like protruding portion 68 which protrudes outward in the radial direction from the outer side plate portion 64 and overlaps the annular portion 56, and the radial outer end of the plate-like protruding portion 68 A third recess 680 recessed inward in the radial direction is formed at the same angular position (center in the circumferential direction) as the groove-like recess 55.

  Further, in the inner side plate portion 65 of the first insulating member 61, a notch 650 is formed in a boundary portion with the plate portion 60. For this reason, the circumferential length of the portion overlapping the radially inner end (inner circumferential arc portion 53) of the salient pole 51 from the one side L1 of the axial direction L is the radial inner end of the salient pole 51 (internal It is shorter than the circumferential length of the circumferential arc portion 53).

(Configuration of power feeding unit 8)
7A and 7B are explanatory views of the feeding portion 8 of the motor 1 to which the present invention is applied, and FIGS. 7A and 7B are perspective views of the core holder 4 with the feeding portion 8 attached. FIG. 6 is a perspective view of the core holder 4 with the power supply unit 8 removed from the core holder 4 as viewed from the inside of the core holder 4;

  As shown in FIG. 1, FIG. 2 and FIG. 7, in the motor 1 of the present embodiment, a feeding portion 8 is formed on the outer peripheral side of the core holder 4. In the present embodiment, a plurality of feed portions 8 are electrically connected to each of a plurality of (U-phase, V-phase, and W-phase) stator coils 6 of stator 3 via wiring members 86 formed of lead wires and the like. The power supply terminal 87 of this (U phase, V phase, and W phase), a single ground terminal 88, and a metal terminal holder 80 for holding the ground terminal 88 and the power supply terminal 87 are provided. The holder 80 is fixed to the outer peripheral surface of the core holder 4.

  In the present embodiment, the terminal holder 80 includes a first metal holder 81 for holding the power supply terminal 87 and the earth terminal 88, and a second metal holder 82 coupled to the first holder 81. The second holder 82 is fixed to the outer peripheral surface of the core holder 4. The first holder 81 is fixed by a screw 819 in contact with the second holder 82, and the second holder 82 is fixed by a screw 829 in contact with the outer peripheral surface of the core holder 4. In the present embodiment, both the first holder 81 and the second holder 82 are made of aluminum.

  The first holder 81 is a metal connector housing for holding the ground terminal 88 and the feeding terminal 87 inside the first cylindrical portion 811 that opens toward the radially outer side (the side opposite to the side where the core holder 4 is located). In the inside of the first cylindrical portion 811, the ground terminal 88 and the feed terminal 87 each have one end directed radially outward (opposite to the side where the core holder 4 is located). The first holder 81 also has a second cylindrical portion 812 that protrudes radially inward (the side on which the core holder 4 is located). Inside the second cylindrical portion 812, the ground terminal 88 and the feed terminal 87 are held by the insulator 814, and the ground terminal 88 and the feed terminal 87 each project from the insulator 814 toward the core holder 4 at the other end. There is. The first holder 81 has a rectangular flange portion 813 between the first cylindrical portion 811 and the second cylindrical portion 812, and the flange portion 813 is fixed to the second holder 82 by a screw 819.

  The second holder 82 is a substantially rectangular metal component having a circular opening 820 open toward the radially outer side (the side opposite to the side where the core holder 4 is located). 2 The cylindrical portion 812 is fitted. A first frame 821 on which the first holder 81 overlaps around the opening 820 and a surface of the first frame 821 on the radial outer side (the side opposite to the side where the core holder 4 is located) of the second holder 82. A second frame portion 822 surrounding the periphery is formed, and the first frame portion 821 is one step higher than the second frame portion 822. A through hole 824 is formed in the second frame portion 822 in the second holder 82, and the screw 829 passes through the through hole 824 and the screw 829 is fixed to the core holder 4. It is fixed.

  In the present embodiment, the insulating second coating film 89 is also formed on the terminal holder 80. More specifically, the insulating second coating film 89 is formed on the side surface of the second holder 82 and the second frame portion 822. However, in the second holder 82, the second coating film 89 is not formed on the first frame portion 821 on which the first holder 81 overlaps and the portion facing the core holder 4 side. In the present embodiment, the second coating 89 is a black coating as in the first coating 39. The first holder 81 having such a configuration is manufactured, for example, by electrodeposition coating after manufacturing the first holder 81 and thereafter removing the second coating film 89 from a predetermined position by post-processing.

In the present embodiment, the core holder 4 is formed with an opening 45 through which the wiring member 86 passes. On the other hand, as shown in FIG. 2B, the terminal holder 80 includes a bottom wall 825 in which a hole 828 for passing the wiring member 86 is formed, and the opening 45 is closed by the bottom wall 825. It is done. More specifically, the second holder 82 has a bottom wall 825 in which a hole 828 for passing the wiring member 86 is formed, and the opening 45 of the core holder 4 is closed by the bottom wall 825 of the second holder 82. It is broken. In the present embodiment, the bottom wall 825 is a protrusion 826 projecting toward the opening 45 in the portion where the hole 828 is formed, and the opening 45 of the core holder 4 is a protrusion of the second holder 82 It is closed by 826. Further, the inner diameter of the hole 828 is the same size as the outer diameter of the wiring member 86 or slightly larger than the outer diameter of the wiring member 86 due to the projection 827 formed in the hole 828. Therefore, the hole 828 is closed by the wiring member 86.

(Electrical connection between the ground terminal 88 and the core holder 4)
In the present embodiment, as described below, the three feed terminals 87 and the three-phase (U-phase, V-phase, and W-phase) stator coils 6 are connected via the wiring members 86, respectively. The wiring member 86 is not used for the electrical connection between the ground terminal 88 and the core holder 4 (the stator core 5). Therefore, only three holes 828 are formed in the bottom wall 825 of the terminal holder 80 (second holder 82).

  More specifically, although all the three power supply terminals 87 are held in an insulated state by the metal terminal holder 80 (the first metal holder 81), the ground terminal 88 is not In the inside of the first holder 81), the terminal holder 80 (first holder 81) is electrically connected. Further, the first holder 81 is fixed to the second holder 82 in a state of being in contact with the second metal holder 82 made of metal. The second holder 82 is fixed to the core holder 4 in a state of being in contact with the metal core holder 4. Therefore, the ground terminal 88 is electrically connected to the stator core 5 via the first holder 81, the second holder 82 and the core holder 4 even without using the wiring member 86.

  As shown in FIG. 1 (b), the core holder 4 is provided with the insulating first coating 39, but the first coating 39 is not formed around the opening 45. Therefore, the terminal holder 80 is fixed to the core holder 4 in a state of being in contact with the portion 390 exposed from the first coating 39 of the outer peripheral surface of the core holder 4. Further, although the insulating second coating film 89 is formed on the side surface or the like of the second holder 82, the second coating film 89 is not formed on the first frame portion 821 overlapping the first holder 81. For this reason, the second holder 82 is fixed to the second holder 82 in a state of being in contact with the portion of the first holder 81 exposed from the second coating film 89. Further, the second coating film 89 is not formed on the surface on the core holder 4 side of the bottom wall 825 in contact with the core holder 4 in the second holder 82. Therefore, the second holder 82 is fixed to the core holder 4 in a state where a portion exposed from the second coating film 89 is in contact with the core holder 4.

(Seal structure in the feeding part 8)
As shown in FIG. 2A, an annular first seal member 801 is disposed between the first holder 81 and the second holder 82. The first seal member 801 is made of a rubber O-ring or the like. Further, on one of the surface of the first holder 81 on the second holder 82 side and the surface of the second holder 82 on the first holder 81 side, a first convex portion 806 projecting so as to contact the other is a first sealing member It is formed in a frame shape along the first seal member 801 inside or outside of 801. In this embodiment, as the second holder 82 is an annular step in which the inner edge of the opening 820 is the first seal member 801, the first frame 821 is the first seal member 801 outside the first seal member 801. The first convex portion 806 extending in a frame shape along the first seal member 801 is in contact with the first holder 81. Therefore, in the present embodiment, the first seal member 801 and the first convex portion 806 prevent the entry of moisture and the like into the inside, and the first holder 81 is the first convex portion with respect to the second holder 82. They are connected at 806 and electrically connected. The first convex portion 806 may be formed on the first holder 81 side.

Further, as shown in FIG. 2B, one of the surface on the core holder 4 side of the bottom wall 825 of the terminal holder 80 (bottom wall 825 of the second holder 82) and one of the surfaces overlapping the bottom wall 825 of the core holder 4 An annularly extending groove 805 is formed so as to surround the opening 45, and an annular second seal member 802 is disposed in the groove 805. The second seal member 802 is made of a rubber O-ring or the like. In the present embodiment, the groove 805 is formed on the surface of the bottom wall 825 of the second holder 82 on the core holder 4 side. In addition, a surface of the bottom wall 825 of the terminal holder 80 (bottom wall 825 of the second holder 82) on the core holder 4 side and one of the surfaces overlapping the bottom wall 825 of the core holder 4 project secondly to contact the other. The convex portion 807 is formed in a frame shape along the second seal member 802 inside the second seal member 802. Further, a third side of the bottom wall 825 of the terminal holder 80 (the bottom wall 825 of the second holder 82) and a surface overlapping with the bottom wall 825 of the core holder 4 project thirdly in contact with the other. The convex portion 808 is formed in a frame shape along the second seal member 802 outside the second seal member 802.

  In the present embodiment, the second convex portion 807 and the third convex portion 808 are formed on the surface on the core holder 4 side of the bottom wall 825 (bottom wall 825 of the second holder 82) of the terminal holder 80 and is in contact with the core holder 4. . Therefore, in the present embodiment, the second seal member 802, the second convex portion 807, and the third convex portion 808 prevent moisture and the like from entering the inside, and the terminal holder 80 (second holder 82) The core holder 4 is in contact with and electrically connected to the core holder 4 at the second convex portion 807 and the third convex portion 808. The second convex portion 807 and the third convex portion 808 may be formed on the core holder 4 side.

(The main effect of this embodiment on earth connection)
As described above, in the motor 1 of the present embodiment, the earth terminal 88 and the metal terminal holder 80 are electrically connected in the power feeding unit 8, so the terminal holder 80 is in contact with the metal core holder 4. By fixing in this manner, the ground terminal 88 and the stator core 5 can be electrically connected without using the wiring member 86 such as a lead wire. Therefore, the electrical connection between the ground terminal 88 and the stator core 5 can be efficiently made. Further, in the bottom wall 825 of the terminal holder 80, the portion where the hole 828 is formed is a convex portion 826 projecting toward the inside of the opening 45, so the space for arranging the wiring member 86 in the terminal holder 80. Is wide. Therefore, since the wiring member 86 can be pulled out to the core holder 4 without being bent forcibly, disconnection or the like is hard to occur in the wiring member 86.

  Further, although the insulating first coating film 39 is formed on the outer peripheral surface of the core holder 4, the terminal holder 80 is in contact with the portion 390 of the outer peripheral surface of the core holder 4 exposed from the first coating film 39. ing. Therefore, even when the insulating first coating film 39 is formed on the outer peripheral surface of the core holder 4, the core holder 4 and the terminal holder 80 can be electrically connected.

  In addition, although the terminal holder 80 is configured of the first metal holder 81 and the second metal holder 82, the first ground terminal 88 is electrically connected to the first holder 81 in the first state. It is held by the holder 81, and the first holder 81 and the second holder 82 are electrically connected. Therefore, by electrically connecting the second holder 82 to the core holder 4, the ground terminal 88 can be electrically connected to the core holder 4 via the first holder 81 and the second holder 82. The second holder 82 is formed with the insulating second coating film 89, but the first holder 81 is in contact with the portion of the second holder 82 exposed from the second coating film 89. The second holder 82 is fixed to the second holder 82, and the second holder 82 is fixed to the core holder 4 in a state where a portion exposed from the second coating film 89 is in contact with the core holder 4. Therefore, even when the insulating second coating film 89 is formed on the outer peripheral surface of the second holder 82, the ground terminal 88 is electrically connected to the core holder 4 through the first holder 81 and the second holder 82. can do.

Further, an annular first seal member 801 is disposed between the first holder 81 and the second holder 82. In addition, a first convex portion 806 in contact with the first holder 81 is formed in the second holder 82. For this reason, it can suppress that water etc. invade from between the 1st holder 81 and the 2nd holder 82. As shown in FIG. In addition, since the first holder 81 and the second holder 82 are in contact with each other via the first convex portion 806, even when sealing is performed by the first seal member 801 between the first holder 81 and the second holder 82. The first holder 81 and the second holder 82 can be electrically connected reliably. In addition, since the first holder 81 and the second holder 82 are in contact with each other via the first convex portion 806, the occurrence of the foreign matter hardly hinders the electrical connection.

  A second seal member 802 is disposed between the bottom wall 825 of the terminal holder 80 and the core holder 4. In the terminal holder 80 (second holder 82), a second convex portion 807 and a third convex portion 808 in contact with the core holder 4 are formed on the inner and outer sides of the second seal member 802. For this reason, it is possible to suppress the entry of moisture or the like from between the terminal holder 80 (second holder 82) and the core holder 4. Further, since the terminal holder 80 (second holder 82) and the core holder 4 are in contact with each other via the second convex portion 807 and the third convex portion 808, the second seal member 802 is interposed between the second holder 82 and the core holder 4. Even when sealing is performed, the terminal holder 80 (second holder 82) and the core holder 4 can be electrically connected reliably. In addition, since the terminal holder 80 (second holder 82) and the core holder 4 are in contact with each other via the second convex portion 807 and the third convex portion 808, it is hard to occur that the electrical connection is interrupted by the presence of foreign matter. .

(Configuration of mold resin portion 7)
FIG. 8 is an explanatory view of the mold resin portion 7 provided in the motor 1 to which the present invention is applied, and FIGS. 8A, 8B, and 8C are explanatory views of a resin molding step, and a resin is molded. They are explanatory drawing which shows the range which is, and explanatory drawing which expands and shows the range where resin is molded. In addition, in FIG.8 (c), only one part of the mold resin part 7 is shown so that the mode before and behind which resin is molded may be intelligible. 8B and 8C are explanatory views of the stator core 5 viewed from the one side L1 in the axial direction L, but the stator core 5 has a configuration in which the one side L1 and the other side L2 in the axial direction are substantially the same. have. Accordingly, in FIGS. 8B and 8C, reference numerals indicating the configuration of the other side L2 in the axial direction L of the stator core 5 are shown in parentheses.

  In this embodiment, as shown in FIG. 8A, after the first insulating member 61 and the second insulating member 62 are attached to the stator core 5 (divided core 50), the description will be given with reference to FIGS. 5 and 6. The stator coil 6 is wound between the outer side plate portion 64 and the inner side plate portion 65, and then, with the plurality of divided cores 50 arranged in the circumferential direction, the core holder 4 is formed by shrink fitting. Secure inside of At that time, the power supply unit 8 is provided in the core holder 4, and the stator coil 6 and the power supply terminal 87 are electrically connected by the wiring member 86.

Next, in a state where the mold 19 is disposed inside the stator core 5, as shown by the arrow R, for the mold between the mold 19 and the core holder 4 from the other side L2 (anti-output side) in the axial direction L Fill the resin. In this embodiment, for example, BMC (Bulk Molding) may be used as a resin for molding.
Compound) is used. The BMC is a resin material in which a filler such as unsaturated polyester resin and calcium carbonate, glass fiber and the like are mixed.

  In the filling step, the gate is disposed at a position where the stator coil 6 is wound with respect to the second insulating member 62. Explaining in detail, the gate is on the stator coil 6 between the outer plate portion 64 and the inner plate portion 65, and is identical to the first recess 66, the second recess 67, the third recess 680, and the grooved recess 55. It is provided to be at the angular position of As a result, the resin flows from the other side L2 (anti-output side) in the axial direction L to the one side L1 (output side) through the space between the groove-like recess 55 and the slot 59 of the stator core 5. Therefore, the stator coil 6 located on the other side L2 in the axial direction L of the stator core 5 is covered with resin, the stator coil 6 located in the slot 59 of the stator core 5 is covered with resin, and the axial direction of the stator core 5 The stator coil 6 located on one side L1 of L is covered with resin.

Therefore, when the resin is solidified, as shown in FIG. 2 (b) and FIGS. 8 (b) and 8 (c), the stator core 5 and the stator coil 6 are covered with the mold resin portion 7 inside the core holder 4. Become. Further, the mold resin portion 7 has a first portion 71 covering the stator coil 6 on one side L1 in the axial direction L of the stator core 5 and a second portion 72 covering the stator coil 6 on the other side L2 in the axial direction L of the stator core 5 And the third portion 73 connected to the first portion 71 and the second portion 72 inside the groove-like recess 55 and the stator coil 6 in the slot 59 sandwiched by the adjacent salient poles 51 in the circumferential direction, The fourth portion 74 connected to the first portion 71 and the second portion 72 is provided.

  Further, in the mold resin portion 7, at least one of the first portion 71 and the second portion 72 is in contact with the inner circumferential surface 40 of the core holder 4. In the present embodiment, in the mold resin portion 7, both the first portion 71 and the second portion 72 are in contact with the inner circumferential surface 40 of the core holder 4. Furthermore, in the mold resin portion 7, the third portion 73 is also in contact with the inner circumferential surface 40 of the core holder 4.

  In addition, since the first recess 66, the second recess 67, and the third recess 680 described with reference to FIGS. 5 and 6 are formed in the first insulating member 61, from the other side L2 in the axial direction L The filled resin for molding tends to flow radially outward of the outer side plate portion 64 from between the outer side plate portion 64 and the inner side plate portion 65 through the first concave portion 66, the second concave portion 67 and the third concave portion 680. Therefore, the resin can easily flow to the one side L1 (output side) in the axial direction L of the stator core 5 through the groove-like recess 55 of the stator core 5.

  When performing such a filling process, the opening 45 of the core holder 4 is closed by the bottom wall 825 of the terminal holder 80 (second holder 82).

(Main effects of this form on resin mold)
As described above, in the present embodiment, the groove-like recess 55 extends from the end of one side L1 of the axial direction L of the stator core 5 to the other end on the outer peripheral surface of the annular portion 56 of the stator core 5. The resin for molding filled from the other side L2 in the axial direction L passes through the inside of the groove-like recess 55 of the stator core 5 to reach the one side L1 in the axial direction L. Therefore, in the mold resin portion 7, the second portion 72 covers the stator coil 6 on the other side L 2 in the axial direction L of the stator core 5, and the first portion 71 is the stator coil 6 on the one side L 1 in the axial direction L of the stator core 5. Cover the

  Further, the resin for molding filled from the other side L2 in the axial direction L passes through the inside of the slot 59 of the stator core 5 to reach the one side L1 in the axial direction L. Therefore, in the mold resin portion 7, the second portion 72 covers the stator coil 6 on the other side L 2 in the axial direction L of the stator core 5, and the first portion 71 is the stator coil 6 on the one side L 1 in the axial direction L of the stator core 5. Cover the

  Therefore, the heat generated in stator coil 6 can be efficiently dissipated to first portion 71 and second portion 72 of mold resin portion 7, and the heat transmitted from stator coil 6 to mold resin portion 7 is stator core 5 and core holder You can escape efficiently through 4. Further, in the present embodiment, since the first portion 71, the second portion 72, and the third portion 73 of the mold resin portion 7 are in contact with the inner peripheral surface 40 of the core holder 4, the power is transmitted from the stator coil 6 to the mold resin portion 7. The heat can be efficiently dissipated to the core holder 4.

  The mold resin portion 7 is made of resin filled from the other side L2 in the axial direction L in a state where the stator core 5 in which the stator coil 6 is wound around the salient pole 51 is provided inside the core holder 4. And the inner circumferential surface 40 of the core holder 4 can be in close contact with each other. Accordingly, heat conduction from the mold resin portion 7 to the core holder 4 can be efficiently performed.

  Further, in the first insulating member 61 and the second insulating member 62, the circumferential length of the portion of the inner plate portion 65 overlapping the radial inner end of the salient pole 51 from the axial direction L is the radial direction of the salient pole 51 It is shorter than the circumferential length of the inner end portion (inner plate portion 65). Therefore, the resin for molding supplied from the other side L2 in the axial direction L of the stator core 5 can easily reach the opposite side (one side L1) in the axial direction L through between the adjacent inner plate portions 65 in the circumferential direction. .

  Further, the groove-shaped concave portion 55 and the salient pole 51 are provided at the same angular position of the stator core 5. In addition, the groove-like recess 55 has a circumferential dimension smaller from the side of the opening edge 551 located radially outward to the bottom portion 552 located radially inward. Therefore, even when the groove-shaped recess 55 is formed in the stator core 5, the magnetic path can be properly formed. In addition, since the width of the opening edge 551 can be increased, the resin can be poured into the one side L1 in the axial direction L.

  Furthermore, since the opening 45 of the core holder 4 is closed by the bottom wall 825 of the terminal holder 80 (second holder 82), the resin is unlikely to leak from the opening 45 when filled with a molding resin. In addition, since the bottom wall 825 has a portion in which the hole 828 is formed is a convex portion 826 projecting toward the inside of the opening 45, the opening 45 can be sufficiently closed. Therefore, when the inside of the core holder 4 is filled with a molding resin, the resin is unlikely to leak from the opening 45. The bottom wall 825 of the terminal holder 80 is formed with a hole 828 through which the wiring member 86 passes, but the hole 828 is closed by the wiring member 86. Therefore, when the resin for molding is filled, the resin does not easily flow into the terminal holder 80 from the hole 828.

(Another embodiment)
In the above embodiment, although the resin for molding is supplied from the other side L2 in the axial direction L, the resin for molding may be supplied from one side L1 in the axial direction L.

  In the above embodiment, although different screws are used for the coupling of the first holder 81 and the second holder 82 and the coupling of the second holder 82 and the core holder 4 in the power feeding unit 8, a common screw is used. It is also good. Moreover, although the terminal holder 80 was comprised by two components (1st holder 81 and 2nd holder 82) in the said embodiment, you may comprise the terminal holder 80 by one component.

  Although the above embodiment shows an example in which the present invention is applied to a permanent magnet type synchronous motor, for example, other synchronous motors such as the stepping motor 1 and the electromagnet synchronous motor, an induction motor, a commutator motor and other motors The present invention may be applied to

1 · · · · · 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · encoder · · First plate, 12 · · Second plate, 16 · · First bearing, 17 · · Second bearing, 19 · · Mold, 20 · · Rotating shaft, 22 · · Rotor core, 23 · · · Rotor magnet, 39 · · First coating, 40 · · Inner circumferential surface of core holder, 45 · · Openings 50 · · Split core, 51 · · Salient pole, 52 · · Body, 53 · · Inner circumferential arc, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 64 · · Outer plate portion, 65 · · · Inner plate portion, 66 · · First recess, 67 · · Second recess, 68 · · Plated protrusion, 7 · · First portion, 72 · · Second portion, 73 · · Third portion, 74 · · Fourth portion, 80 · · Terminal holder, 81 · · First holder, 82 · · Second holder, 86 · · · Wiring member 87 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · part exposed from the first coating, 680 · · third recess, 801 · · first seal Member, 802 second sealing member, 805 groove, 806 first convex portion, 807 second convex portion, 80
8 · · Third convex portion, 825 · · Bottom wall, 826 · convex portion 828 · · · · · · L · · axial direction, L1 · · · one side, L · · · the other side

Claims (14)

With the rotor,
A cylindrical stator surrounding the rotor radially outward;
Have
The stator includes a ring portion and a stator core including a plurality of salient poles projecting radially inward from the ring portion, a stator coil wound around each of the plurality of salient poles, and the stator core in a radial direction A cylindrical core holder for holding the stator core in contact from the outside, and a molded resin portion covering the stator coil and the stator core inside the core holder,
The outer peripheral surface of the stator core is formed with a groove-like recess extending from one end of the stator core in the axial direction to the other end.
The mold resin portion has a first portion covering the stator coil on the one side in the axial direction of the stator core, a second portion covering the stator coil on the other side in the axial direction of the stator core, and the grooved recess And a third portion connected to the first portion and the second portion inside the
At least one of the first portion and the second portion is in contact with the inner peripheral surface of the core holder ,
The stator coil is wound around the salient pole via an insulating member disposed to overlap an axial end of the stator core.
The insulating member projects from an end plate portion overlapping the salient pole in the axial direction, and a radial outer portion of the end plate portion to the opposite side to the stator core in the axial direction to radially extend the winding range of the stator coil. An outer side plate portion regulated at the outer side, and an inner side plate portion projecting from the radially inner end portion of the end plate portion to the opposite side to the stator core in the axial direction to regulate the winding range of the stator coil radially inner side And
A first concave portion recessed toward the side where the stator core is located is formed at an end portion of the outer side plate portion located on the opposite side to the axial direction of the stator core,
The motor according to the present invention is characterized in that a radially outer surface of the outer side plate portion is formed with a second recessed portion which is recessed radially inward . The motor according to claim 1, wherein the first recess and the second recess are provided at the same angular position as the groove-shaped recess . The insulating member includes a plate-like protruding portion that protrudes outward in the radial direction from the outer side plate portion and overlaps the annular portion.
The third recess recessed inward in the radial direction is formed at the same angular position as that of the groove-like recess at the radial outer end of the plate-like protrusion. The motor according to 2. In the inner plate portion, the circumferential length of a portion overlapping in the axial direction with the radial inner end of the salient pole is shorter than the circumferential length of the radial inner end of the salient pole. Item 4. A motor according to any one of items 1 to 3 . With the rotor,
A cylindrical stator surrounding the rotor radially outward;
Have
The stator includes a ring portion and a stator core including a plurality of salient poles projecting radially inward from the ring portion, a stator coil wound around each of the plurality of salient poles, and the stator core in a radial direction A cylindrical core holder for holding the stator core in contact from the outside, and a molded resin portion covering the stator coil and the stator core inside the core holder,
The outer peripheral surface of the stator core is formed with a groove-like recess extending from one end of the stator core in the axial direction to the other end.
The mold resin portion has a first portion covering the stator coil on the one side in the axial direction of the stator core, a second portion covering the stator coil on the other side in the axial direction of the stator core, and the grooved recess And a third portion connected to the first portion and the second portion inside the
At least one of the first portion and the second portion is in contact with the inner peripheral surface of the core holder,
The stator coil is wound around the salient pole via an insulating member disposed to overlap an axial end of the stator core.
The insulating member projects from an end plate portion axially overlapping the salient pole in the axial direction, and from the radially outer portion of the end plate portion in the axial direction opposite to the stator core in the axial direction and in a winding range of the stator coil And an outer side plate portion which restricts the outer side in the radial direction and a circumferentially inner side of the winding direction of the stator coil from the radially inner end of the end plate portion so as to protrude in the opposite side and the circumferential direction to the stator core in the axial direction. And an inner plate portion regulated by the
The motor according to the present invention is characterized in that a radially outer surface of the outer side plate portion is formed with a second recessed portion which is recessed radially inward . With the rotor,
A cylindrical stator surrounding the rotor radially outward;
Have
The stator includes a ring portion and a stator core including a plurality of salient poles projecting radially inward from the ring portion, a stator coil wound around each of the plurality of salient poles, and the stator core in a radial direction A cylindrical core holder for holding the stator core in contact from the outside, and a molded resin portion covering the stator coil and the stator core inside the core holder,
The outer peripheral surface of the stator core is formed with a groove-like recess extending from one end of the stator core in the axial direction to the other end.
The mold resin portion has a first portion covering the stator coil on the one side in the axial direction of the stator core, a second portion covering the stator coil on the other side in the axial direction of the stator core, and the grooved recess A third part connected to the first part and the second part inside the
And
At least one of the first portion and the second portion is in contact with the inner peripheral surface of the core holder,
The stator coil is wound around the salient pole via an insulating member disposed to overlap an axial end of the stator core.
The insulating member projects from an end plate portion axially overlapping the salient pole in the axial direction, and from the radially outer portion of the end plate portion in the axial direction opposite to the stator core in the axial direction and in a winding range of the stator coil And an outer side plate portion which restricts the outer side in the radial direction and a circumferentially inner side of the winding direction of the stator coil from the radially inner end of the end plate portion so as to protrude in the opposite side and the circumferential direction to the stator core in the axial direction. An inner plate portion regulated by the first and second plate portions, and a plate-like protrusion portion protruding radially outward from the outer plate portion and overlapping the annular portion;
The motor according to the present invention is characterized in that a third recess recessed inward in the radial direction is formed at the same angular position as that of the groove-like recess at the radial outer end of the plate-like protrusion . With the rotor,
A cylindrical stator surrounding the rotor radially outward;
Have
The stator includes a ring portion and a stator core including a plurality of salient poles projecting radially inward from the ring portion, a stator coil wound around each of the plurality of salient poles, and the stator core in a radial direction A cylindrical core holder for holding the stator core in contact from the outside, and a molded resin portion covering the stator coil and the stator core inside the core holder,
The outer peripheral surface of the stator core is formed with a groove-like recess extending from one end of the stator core in the axial direction to the other end.
The mold resin portion has a first portion covering the stator coil on the one side in the axial direction of the stator core, a second portion covering the stator coil on the other side in the axial direction of the stator core, and the grooved recess And a third portion connected to the first portion and the second portion inside the
At least one of the first portion and the second portion is in contact with the inner peripheral surface of the core holder,
The stator coil is wound around the salient pole via an insulating member disposed to overlap an axial end of the stator core.
The insulating member projects from an end plate portion axially overlapping the salient pole in the axial direction, and from the radially outer portion of the end plate portion in the axial direction opposite to the stator core in the axial direction and in a winding range of the stator coil And an outer side plate portion which restricts the outer side in the radial direction and a circumferentially inner side of the winding direction of the stator coil from the radially inner end of the end plate portion so as to protrude in the opposite side and the circumferential direction to the stator core in the axial direction. An inner plate portion regulated by the first and second plate portions, and a plate-like protrusion portion protruding radially outward from the outer plate portion and overlapping the annular portion;
The motor according to claim 1, wherein a circumferential length of a portion of the inner plate portion overlapping a radial inner end of the salient pole is shorter than a circumferential length of the radial inner end of the salient pole . The stator core is a plurality of divided cores divided in the circumferential direction,
The motor according to any one of claims 1 to 7, wherein the insulating member is provided for each of the divided cores . Among the plurality of salient poles, the mold resin portion covers a fourth portion connected to the first portion and the second portion while covering the stator coil in a slot sandwiched by the adjacent salient poles in the circumferential direction. motor according to any one of claims 1 to 8, characterized in that it has. The motor according to any one of claims 1 to 9, wherein the first portion and the second portion are in contact with the inner peripheral surface of the core holder . The motor according to claim 10 , wherein the first portion, the second portion and the third portion are in contact with the inner peripheral surface of the core holder . The motor according to any one of claims 1 to 11, wherein the grooved recess and the salient pole are provided at the same angular position of the stator core . 13. The groove-shaped recess according to any one of claims 1 to 12 , wherein the dimension in the circumferential direction decreases from the side of the opening edge located radially outward to the bottom located radially inward. The motor described in the section. The mold resin portion is made of a resin filled from the one side or the other side in the axial direction in a state where the stator core in which the stator coil is wound around the salient pole is provided inside the core holder. The motor according to any one of claims 1 to 13 .