JP2015050817A - Brushless motor, brushless motor device, and installation method of brushless motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit components in a motor, such as a terminal part, from being covered with water.SOLUTION: A terminal case 24 is assembled to a body part 40 of a center piece 20 holding a rotor shaft 38 and a stator 16. The body part 40 and the terminal case 24 form a space part 56 that houses the terminal part 58. A first labyrinth wall 62 is erected from the body part 40 of the center piece 20 toward the terminal case 24 side. A second labyrinth wall 64 is erected from the terminal case 24 toward the body part 40 side. The second labyrinth wall 64 is positioned at the inner side of the first labyrinth wall 62. The first labyrinth wall 62 and the second labyrinth wall 64 form a labyrinth structure 70 enclosing the terminal part 58 at the inner side of the space part 56.

Description

  The present invention relates to a brushless motor, a brushless motor device, and an installation method of the brushless motor device.

  Conventionally, there is a brushless motor including a stator, a rotor that is rotated by a rotating magnetic field formed by the stator, a rotor shaft that supports the rotor, and a motor holder that holds the stator. In addition, in this type of brushless motor, a drive circuit portion having a terminal portion connected to a winding terminal portion derived from a stator and a space portion that is assembled to the motor holder and accommodates the terminal portion are formed together with the motor holder. A terminal case is provided (see, for example, Patent Document 1).

JP 2012-95402 A

  In such a brushless motor, it is required that components inside the motor such as the terminal portion can be prevented from getting wet.

  Then, an object of this invention is to enable it to suppress that components in motors, such as a terminal part, get wet.

  To achieve the above object, a brushless motor according to claim 1 is a motor that holds a stator, a rotor that rotates by a rotating magnetic field formed by the stator, a rotor shaft that supports the rotor, and the stator. A holder, a drive circuit portion having a terminal portion connected to a winding terminal portion derived from the stator, and a terminal case assembled with the motor holder and forming a space portion for accommodating the terminal portion together with the motor holder A first labyrinth wall erected from one side of the motor holder and the terminal case toward the other side, a erection from the other side of the motor holder and the terminal case toward the one side, and the first A labyrinth structure that is located inside the labyrinth wall and surrounds the terminal portion together with the first labyrinth wall is the space portion. It includes a second labyrinth wall forming on the inside, a.

  According to this brushless motor, a labyrinth structure that surrounds the terminal portion is formed inside the space portion by the first labyrinth wall and the second labyrinth wall erected from each of the motor holder and the terminal case. Therefore, for example, even when a water droplet enters the inside of the space from between the motor holder and the terminal case, it is possible to suppress the water inside the motor and other components such as the terminal portion by the labyrinth structure. .

  A brushless motor according to a second aspect is the brushless motor according to the first aspect, wherein the first labyrinth wall and the second labyrinth wall are close to each other.

  According to this brushless motor, the first labyrinth wall and the second labyrinth wall are close to each other. Therefore, even if a water droplet enters between the first labyrinth wall and the first labyrinth wall, the water droplet is brought into contact with both the first labyrinth wall and the second labyrinth wall by the surface tension. It flows between the first labyrinth wall and the second labyrinth wall. Thereby, it can suppress that a water droplet gets over an inner 2nd labyrinth wall.

  In addition, as described in claim 3, the gap between the first labyrinth wall and the second labyrinth wall that are close to each other is a water droplet that has entered between the first labyrinth wall and the second labyrinth wall as described above. Is preferably set to dimensions that can contact the first labyrinth wall and the second labyrinth wall.

  In addition, as described in claim 4, when the gap between the first labyrinth wall and the second labyrinth wall in this case is more specifically set in a range of 1 mm to 3 mm, the first labyrinth wall It is preferable because water droplets entering between the first labyrinth wall and the second labyrinth wall come into contact with the first labyrinth wall and the second labyrinth wall.

  The brushless motor according to claim 5 is the brushless motor according to any one of claims 2 to 4, wherein the first labyrinth wall and the second labyrinth wall are formed in parallel to each other. is there.

  According to this brushless motor, the first labyrinth wall and the second labyrinth wall are formed in parallel to each other. Therefore, since the dimension of the gap between the first labyrinth wall and the second labyrinth wall that are close to each other is made constant, water droplets that have entered between the first labyrinth wall and the second labyrinth wall are caused by the surface tension. It can flow smoothly along the first labyrinth wall and the second labyrinth wall.

  The brushless motor according to claim 6 is the brushless motor according to any one of claims 2 to 5, wherein the first labyrinth wall and the second labyrinth wall are formed along a circumferential direction of the stator. It has been done.

  According to this brushless motor, the first labyrinth wall and the second labyrinth wall are formed along the circumferential direction of the stator. Therefore, even if the mounting angle of the brushless motor attached to the installation target with the central axis extending in the horizontal direction is changed around the central axis, it enters between the first labyrinth wall and the second labyrinth wall. The water droplets can be made to flow vertically downward along the first labyrinth wall and the second labyrinth wall.

  The brushless motor according to claim 7 is the brushless motor according to any one of claims 1 to 6, wherein the space portion and the outside communicate with each other outside the first labyrinth wall of the motor holder. A drain hole is formed.

  According to this brushless motor, the drain hole is formed outside the first labyrinth wall of the motor holder, and the space formed by the motor holder and the terminal case is communicated with the outside through the drain hole. ing. Therefore, water droplets that have entered the space formed by the motor holder and the terminal case but are prevented from entering the motor by the labyrinth structure can be discharged to the outside through the water drain hole.

  The brushless motor according to claim 8 is the brushless motor according to claim 7, wherein a plurality of the drain holes are formed in a range of 180 degrees or more around the rotor shaft so as to surround the first labyrinth wall. It has been done.

  According to this brushless motor, a plurality of drain holes are formed in a range of at least 180 degrees around the rotor shaft so as to surround the first labyrinth wall. Therefore, for the brushless motor attached to the installation target with the central axis extending in the horizontal direction, if the mounting angle is changed around the central axis (any one of the plurality of drain holes is always vertically downward) Even when the mounting angle is changed within the range in which it is positioned), water droplets can be discharged to the outside through the drain holes located on the lower side in the vertical direction among the plurality of drain holes.

  A brushless motor device according to a ninth aspect includes the brushless motor according to the eighth aspect and a shroud attached to the motor holder, and among the plurality of drain holes, the brushless motor is to be installed. In the attached state, a drain hole located on the lower side in the vertical direction is opened by an opening formed in the shroud, and a remaining drain hole of the plurality of drain holes is formed in the shroud. It is obstructed by.

  According to this brushless motor device, out of the plurality of drain holes, the drain hole located on the lower side in the vertical direction in the mounting state of the brushless motor on the installation target is opened by the opening formed in the shroud. ing. Therefore, water droplets can be discharged to the outside through this drain hole. On the other hand, among the plurality of drain holes, the remaining drain holes are closed by a closing portion formed in the shroud. Therefore, it is possible to prevent water droplets from entering through the drain holes.

  The brushless motor device installation method according to claim 10 is a brushless motor device installation method for installing the brushless motor device according to claim 9 on the installation target, wherein the brushless motor device is installed on the brushless motor. In this method, a plurality of shrouds having different motor mounting angles are prepared, one shroud is selected from the plurality of shrouds, and the brushless motor is attached to the installation target using the selected one shroud.

  According to this installation method of the brushless motor device, since a plurality of shrouds are prepared, even when the mounting angle of the brushless motor is changed, it is not necessary to change the structure of the brushless motor itself. Thereby, an increase in cost can be suppressed.

It is a front view of a brushless motor. It is a perspective view of a brushless motor. It is a longitudinal cross-sectional view of a brushless motor. FIG. 4 is an enlarged view of a main part of an upper part of the brushless motor shown in FIG. It is sectional drawing which looked at the brushless motor from the back side. It is a perspective view of a brushless motor in the state where a terminal case was removed. It is a perspective view of a terminal case. It is a principal part expanded rear view of the brushless motor apparatus mounted in the shroud in the position which rotated the brushless motor 90 degree | times. It is F9-F9 sectional view taken on the line of FIG. It is F10-F10 sectional view taken on the line of FIG. It is a principal part expanded rear view of the brushless motor apparatus which mounted the brushless motor in the shroud in the normal position. It is F12-F12 sectional view taken on the line of FIG. It is a rear view of the shroud which mounts a brushless motor in a normal position. It is a rear view of the shroud which mounts a brushless motor in the position rotated 90 degree | times. It is a rear view of the shroud which mounts the brushless motor in the position rotated 60 degree | times. It is a principal part enlarged view of the lower part of the brushless motor apparatus shown by FIG. It is a principal part enlarged view of the upper part of the brushless motor apparatus shown by FIG.

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

  As shown in FIGS. 1 and 2, the brushless motor 10 according to an embodiment of the present invention includes a motor unit 12 and a drive circuit unit 14. The motor unit 12 and the drive circuit unit 14 are arranged in a direction orthogonal to the axial direction of the motor unit 12.

  As shown in FIG. 3, the motor unit 12 includes a stator 16, a rotor 18, a center piece 20 that is an example of a motor holder, a lid member 22, and a terminal case 24. The stator 16 has a core 26 formed in an annular shape and a plurality of windings 28 wound around a plurality of teeth formed radially on the core 26.

  The rotor 18 has a bottomed cylindrical rotor housing 30 and a rotor magnet 32 fixed to the inner peripheral surface of the rotor housing 30. The stator 16 is accommodated inside the rotor housing 30, and the rotor magnet 32 faces the stator 16 in the radial direction.

  A concave bearing housing portion 34 having a circular shape when viewed in the axial direction is formed at the center of the rotor housing 30, and a pair of bearings 36 including ball bearings are housed inside the bearing housing portion 34. Has been. A rotor shaft 38 is press-fitted into the inner ring of each bearing 36, and the outer ring of each bearing 36 is press-fitted inside the bearing housing portion 34. Then, by assembling the rotor shaft 38 and the rotor 18 through the pair of bearings 36 in this way, the rotor 18 is rotatably supported by the rotor shaft 38. The rotor 18 is rotated by a rotating magnetic field formed by the stator 16.

  The center piece 20 includes a main body 40 that is an example of a holder main body disposed to face the opening of the rotor housing 30 described above, and a holding portion 42 that is formed at the center of the main body 40. Yes. The holding portion 42 is formed with a cylindrical portion 44 that protrudes from the central portion of the main body portion 40 toward the inside of the rotor housing 30, and a press-fit portion 46 that protrudes on the opposite side of the cylindrical portion 44. The cylindrical portion 44 is press-fitted inside the core 26 in a state of being disposed around the bearing housing portion 34. The cylindrical portion 44 is press-fitted inside the core 26 as described above, so that the stator 16 having the core 26 is held by the holding portion 42 of the center piece 20.

  Further, the press-fit portion 46 is formed in a concave shape that opens to the rotor 18 side. One end of the rotor shaft 38 is press-fitted inside the press-fit portion 46, whereby the rotor shaft 38 is held by the holding portion 42 of the center piece 20.

  The main body 40 is formed in a substantially disc shape and extends outward in the radial direction from the outer shape of the rotor housing 30. A plurality of cooling holes 48 penetrating in the thickness direction of the main body 40 (same as the axial direction of the stator 16) are formed at positions corresponding to the windings 28 in the main body 40. In addition, a plurality of cooling holes 50 similar to the cooling holes 48 described above are formed between the cylindrical portion 44 and the press-fit portion 46 in the holding portion 42. The plurality of cooling holes 48 and 50 are all arranged annularly along the circumferential direction of the stator 16.

  The lid member 22 is formed in a flat dish shape, and is disposed on the opposite side of the main body 40 from the stator 16 side (rotor 18 side). The lid member 22 is arranged with the main body 40 side as the bottom side. The bottom portion 52 of the lid member 22 is in contact with the peripheral portion of the holding portion 42 in the main body portion 40, and the side wall portion 54 of the lid member 22 is formed along the circumferential direction of the rotor shaft 38 ( (See also FIG. 5). The bottom 52 of the lid member 22 is located on the radially inner side with respect to the plurality of cooling holes 48 described above.

  The terminal case 24 is assembled to the main body 40 from the side opposite to the stator 16 side (rotor 18 side) with respect to the main body 40. The terminal case 24 is formed to have substantially the same outer shape as the main body 40, and the peripheral edge of the terminal case 24 is joined to the peripheral edge of the main body 40. The terminal case 24 forms a space 56 together with the main body 40. Inside the space 56, the lid member 22 and the plurality of terminal portions 58 shown in FIG. Contains parts.

  As shown in FIG. 5, the terminal portion 58 extends from the drive circuit portion 14 to the motor portion 12 side along the radial direction of the motor portion 12. A winding terminal 60 extending from the stator 16 is connected. The winding terminal portion 60 extends in the axial direction of the stator 16 from each winding 28 (see FIG. 3) provided on the stator 16 described above, penetrates the main body portion 40, and is on the stator 16 side with respect to the main body portion 40. And is derived on the opposite side.

  Then, the waterproof structure which is the characteristic structure of the above-mentioned brushless motor 10 is demonstrated.

  As shown in FIG. 3, the main body 40 of the centerpiece 20 is formed with a first labyrinth wall 62 erected toward the terminal case 24, and the terminal case 24 has a main body 40 side. A second labyrinth wall 64 erected toward is formed (see also FIGS. 6 and 7 as appropriate). The first labyrinth wall 62 and the second labyrinth wall 64 are both formed with the axial direction of the stator 16 as the height direction.

  The first labyrinth wall 62 is located on the radially outer side of the outer peripheral portion 66 of the rotor housing 30 and on the radially inner side of the peripheral wall portion 68 formed on the peripheral edge of the main body portion 40. On the other hand, the second labyrinth wall 64 is located on the inner side of the first labyrinth wall 62 and on the outer side in the radial direction from the plurality of cooling holes 48 formed in the main body portion 40.

  The end of the first labyrinth wall 62 in the height direction has a gap with the terminal case 24, and the end of the second labyrinth wall 64 in the height direction has a gap with the main body 40. have. And thereby, the 1st labyrinth wall 62 and the 2nd labyrinth wall 64 form the labyrinth structure 70 which forms the meandering water droplet flow path inside the space part 56. FIG.

  The first labyrinth wall 62 and the second labyrinth wall 64 that form the labyrinth structure 70 are formed in a substantially C shape along the circumferential direction of the stator 16. That is, as shown in FIG. 5, one end of the first labyrinth wall 62 and the second labyrinth wall 64 is positioned on one side in the direction in which the plurality of terminal portions 58 are arranged with respect to the plurality of terminal portions 58. The other ends of the one labyrinth wall 62 and the second labyrinth wall 64 are located on the other side in the direction in which the plurality of terminal portions 58 are arranged with respect to the plurality of terminal portions 58. The labyrinth structure 70 having a substantially C shape formed by the first labyrinth wall 62 and the second labyrinth wall 64 surrounds the plurality of terminal portions 58 inside the space portion 56.

  The first labyrinth wall 62 and the second labyrinth wall 64 are formed in parallel to each other and are close to each other. The gap between the first labyrinth wall 62 and the second labyrinth wall 64 that are close to each other is such that water drops that have entered between the first labyrinth wall 62 and the second labyrinth wall 64 are, as will be described later. And the dimension which can contact the 2nd labyrinth wall 64 is set.

  That is, in this embodiment, as an example, the gap between the first labyrinth wall 62 and the second labyrinth wall 64 is more specifically set in a range of 1 mm to 3 mm, and more preferably the gap is 2 mm. Set to If the gap is less than 1 mm, it is difficult for water droplets to enter the gap, and if the gap exceeds 3 mm, it is difficult to contact the first labyrinth wall 62 and the second labyrinth wall 64 using surface tension. It becomes.

  Further, as shown in FIG. 5, a plurality of drain holes 72 are formed on the inner side of the peripheral wall portion 68 in the main body portion 40 and on the outer side of the first labyrinth wall 62. The plurality of drain holes 72 penetrates in the thickness direction of the main body 40 and communicates the space 56 with the outside.

  The plurality of drain holes 72 are formed in a range of at least 180 degrees around the rotor shaft 38 so as to surround the first labyrinth wall 62. In the present embodiment, as an example, the plurality of drain holes 72 are formed side by side in the outer peripheral portion of the main body portion 40 excluding the side portion along the drive circuit portion 14 (see also FIG. 1).

  Next, the brushless motor device 80 including the brushless motor 10 and the shroud 82 described above will be described.

  As shown in FIGS. 8 and 9, the brushless motor 10 described above constitutes a brushless motor device 80 together with the shroud 82. The shroud 82 is a bracket for fixing the brushless motor 10 to an installation target such as a car body of an automobile, and is formed in a substantially annular shape.

  In this embodiment, in order to change the mounting angle of the brushless motor 10 on the installation target, three types of shrouds 82 are used as an example. That is, the shroud 82 shown in FIG. 13 mounts the brushless motor 10 at the normal position (rotation angle 0 degree), and the shroud 82 shown in FIG. 14 has the brushless motor 10 at 90 degrees with respect to the normal position. The shroud 82 shown in FIG. 15 is mounted at a position where the brushless motor 10 is rotated 60 degrees with respect to the normal position. In addition, arrow UP shown in several figures including FIGS. 13-15 has shown the vertical direction upper side in the installation state to the installation object of the brushless motor apparatus 80. FIG.

  A substantially rectangular cutout 84 is formed in a part of each shroud 82 shown in FIGS. 13 to 15 in the circumferential direction so as to open outward in the radial direction of the shroud 82. The formation position of the notch 84 is different in each shroud 82 shown in FIGS.

  That is, in the shroud 82 shown in FIG. 13, the notch portion 84 is formed in a portion located on the upper side in the vertical direction of the shroud 82 in the attached state of the shroud 82 to the installation target. On the other hand, in the shroud 82 shown in FIG. 14, the notch portion 84 is formed at a position rotated 90 degrees in the circumferential direction of the shroud 82 from a portion located on the upper side in the vertical direction of the shroud 82 in the attached state of the shroud 82 to the installation target. Has been. Further, in the shroud 82 shown in FIG. 15, the notch portion 84 is formed at a position rotated by 60 degrees in the circumferential direction of the shroud 82 from a portion located on the upper side in the vertical direction of the shroud 82 in the attached state of the shroud 82 to the installation target. Has been.

  In each shroud 82 shown in FIGS. 13 to 15, the drive circuit portion 14 (see FIG. 8) of the brushless motor 10 described above is disposed in the notch portion 84. For example, when the shroud 82 shown in FIG. 14 is used, as shown in FIG. 8, the brushless motor 10 is mounted on the shroud 82 while being rotated 90 degrees with respect to the normal position. . Although not particularly illustrated, when the shroud 82 shown in FIG. 13 is used, the brushless motor 10 is mounted on the shroud 82 in a state of being positioned at the normal position, and the shroud 82 shown in FIG. 15 is used. When the brushless motor 10 is rotated, the brushless motor 10 is mounted on the shroud 82 in a state of being rotated 60 degrees with respect to the normal position.

  Each of the shrouds 82 is formed with a mounting portion 86 that is mounted on the brushless motor 10 as shown in FIGS. The mounting portion 86 is formed in an annular shape along the circumferential direction of the main body portion 40. As shown in FIG. 9, the mounting portion 86 is positioned on the rotor 18 side with respect to the main body portion 40 and on the radially outer side of the rotor housing 30 in a state where the shroud 82 is assembled to the brushless motor 10. More specifically, the mounting portion 86 is mounted on the outer peripheral side portion of the main body portion 40 from the rotor 18 side.

  Further, in the shroud 82 shown in FIGS. 13 to 15, the mounting portion 86 is formed with an opening portion 88 for opening the drain hole 72 (see FIG. 8 and the like). The opening 88 is formed by, for example, a notch or a hole. In any of the shrouds 82 shown in FIGS. 13 to 15, the open portion 88 is formed in a portion located on the lower side in the vertical direction of the mounting portion 86 in the mounting state of the shroud 82 to the installation target.

  Then, for example, when the shroud 82 shown in FIG. 14 is used, as shown in FIGS. 8 and 9, in the state of attachment to the installation target of the brushless motor 10 among the plurality of drain holes 72. The drain hole 72 located on the lower side in the vertical direction is opened by the opening portion 88. Similarly, for example, when the shroud 82 shown in FIG. 13 is used, as shown in FIGS. 11 and 12, the attachment state of the brushless motor 10 to the installation target among the plurality of drain holes 72. , The drain hole 72 located on the lower side in the vertical direction is opened by the opening portion 88. Also, when the shroud 82 shown in FIG. 15 is used, the drain hole 72 on the lower side in the vertical direction is opened by the opening 88, although not particularly shown.

  Further, in the shroud 82 shown in FIGS. 13 to 15, a portion of the mounting portion 86 other than the opening portion 88 is formed as a closing portion 90 for closing the drain hole 72 (see FIG. 8 and the like). .

  For example, when the shroud 82 shown in FIG. 14 is used, as shown in FIGS. 8 and 9, the water drain hole 72 opened by the open portion 88 among the plurality of water drain holes 72. The remaining drain holes 72 other than are closed by the closing portion 90. Similarly, for example, when the shroud 82 shown in FIG. 13 is used, as shown in FIG. 11, the remaining drain holes 72 other than the drain holes 72 opened by the opening 88 are blocked. It is blocked by 90. Further, when the shroud 82 shown in FIG. 15 is used, the remaining drainage holes 72 other than the drainage holes 72 opened by the opening portion 88 are closed by the closing portion 90, although not particularly illustrated.

  Thus, in the present embodiment, the structure of the brushless motor 10 is not changed, and a plurality of shrouds 82 having different mounting angles of the brushless motor 10 are prepared for one type of brushless motor 10. Then, one shroud 82 is selected from the plurality of shrouds 82, and the brushless motor 10 is attached to the installation target using the selected one shroud 82.

  Next, the operation and effect of one embodiment of the present invention will be described.

  As described above in detail, according to the present embodiment, the first labyrinth wall 62 and the second labyrinth wall that are erected from the main body portion 40 and the terminal case 24 of the center piece 20 are provided inside the space portion 56. The labyrinth structure 70 surrounding the terminal portion 58 is formed by 64. Therefore, for example, as shown in FIGS. 3 to 5, even when water droplets W enter the space portion 56 from between the main body portion 40 and the terminal case 24, the water droplets W cause the inside of the motor such as the terminal portion 58. The labyrinth structure 70 can prevent the parts from getting wet.

  In particular, as shown in FIG. 4, the first labyrinth wall 62 and the second labyrinth wall 64 are close to each other. Therefore, even if a water drop W enters between the first labyrinth wall 62 and the first labyrinth wall 62, the water drop W is in contact with both the first labyrinth wall 62 and the second labyrinth wall 64. The water droplet W flows between the first labyrinth wall 62 and the second labyrinth wall 64 downward in the vertical direction by the surface tension. Thereby, it can suppress that the water droplet W gets over the inner 2nd labyrinth wall 64.

  Moreover, the first labyrinth wall 62 and the second labyrinth wall 64 are formed in parallel to each other. Therefore, since the dimension of the gap between the first labyrinth wall 62 and the second labyrinth wall 64 that are close to each other is made constant, the water droplet W that has entered between the first labyrinth wall 62 and the second labyrinth wall 64. Can flow smoothly downward along the first labyrinth wall 62 and the second labyrinth wall 64 by the surface tension.

  Further, the first labyrinth wall 62 and the second labyrinth wall 64 are formed in a substantially C shape along the circumferential direction of the stator 16. Therefore, for the brushless motor 10 attached to the installation target with the central axis extending in the horizontal direction, when the mounting angle is changed around the central axis (for example, the above-described 90 degree rotation position or 60 degree rotation position). Even when changed, the water droplet W that has entered between the first labyrinth wall 62 and the second labyrinth wall 64 can flow downward along the first labyrinth wall 62 and the second labyrinth wall 64 in the vertical direction. .

  In addition, a plurality of drain holes 72 are formed outside the first labyrinth wall 62 in the main body 40 to communicate the space 56 with the outside. Among the plurality of drain holes 72, the drain hole 72 positioned on the lower side in the vertical direction in the mounting state of the brushless motor 10 on the installation target is an opening formed in the shroud 82 as shown in FIG. Opened by part 88. Accordingly, the water droplets W that have entered the space 56 formed by the main body 40 and the terminal case 24 but have been prevented from entering the motor by the labyrinth structure 70 are drain holes 72 located on the lower side in the vertical direction. It can be discharged to the outside.

  Further, as shown in FIGS. 8 and 11, the plurality of drain holes 72 are formed in a range of 180 degrees or more around at least the rotor shaft 38 so as to surround the first labyrinth wall 62. Yes. Therefore, even when the mounting angle of the brushless motor 10 is changed (for example, when the brushless motor 10 is changed to the above-described 90-degree rotation position or 60-degree rotation position), the plurality of drain holes 72 are positioned on the lower side in the vertical direction. Water droplets can be discharged to the outside through the drain holes 72.

  Further, the remaining drain holes 72 (the drain holes 72 other than the drain holes 72 positioned on the lower side in the vertical direction) among the plurality of drain holes 72 are blocked by the blocking portion 90 formed in the shroud 82. (See also FIG. 16). Accordingly, it is possible to prevent water droplets from entering through the drain holes 72.

  Further, as described above, according to the installation method of the brushless motor device 80 according to the present embodiment, a plurality of shrouds 82 (see FIGS. 13 to 15) are prepared, and therefore the mounting angle of the brushless motor 10 is changed. However, it is not necessary to change the structure of the brushless motor 10 itself. Thereby, an increase in cost can be suppressed.

  That is, when the position of the drain hole 72 is changed so that the drain hole 72 is not positioned on the upper side in the vertical direction each time the mounting angle of the brushless motor 10 is changed, the structure of the brushless motor 10 itself is changed. Although the change is necessary and the cost is increased, according to the present embodiment, since the structure of the brushless motor 10 is not required to be changed, the cost increase can be suppressed.

  Next, a modification of one embodiment of the present invention will be described.

  In the above embodiment, the outer first labyrinth wall 62 is erected from the main body portion 40 of the centerpiece 20 toward the terminal case 24 side, and the inner second labyrinth wall 64 is extended from the terminal case 24 to the main body portion 40 side. It was erected towards. However, the outer first labyrinth wall 62 is erected from the terminal case 24 toward the main body portion 40 side, and the inner second labyrinth wall 64 is erected from the main body portion 40 toward the terminal case 24 side. May be.

  Further, in the above-described embodiment, the rotor shaft 38 is fixed to the center piece 20 so as to be impossible, and the rotor 18 is supported to be rotatable with respect to the rotor shaft 38. However, the rotor shaft 38 may be rotatably supported by the center piece 20, and the rotor 18 may be fixed to the rotor shaft 38 so as to be integrally rotatable.

  In the above embodiment, the first labyrinth wall 62 and the second labyrinth wall 64 are formed in a substantially C shape along the circumferential direction of the stator 16. However, the first labyrinth wall 62 and the second labyrinth wall 64 may be formed in an annular shape along the circumferential direction of the stator 16.

  In addition, the mounting angle of the brushless motor 10 is, for example, the normal position (0 degree), 90 degrees, and 60 degrees, but may be other angles.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Brushless motor, 12 ... Motor part, 14 ... Drive circuit part, 16 ... Stator, 18 ... Rotor, 20 ... Centerpiece (an example of a motor holder), 22 ... Cover member, 24 ... Terminal case, 26 ... Core, 28 DESCRIPTION OF SYMBOLS Winding, 30 ... Rotor housing, 32 ... Rotor magnet, 34 ... Bearing accommodating part, 36 ... Bearing, 38 ... Rotor shaft, 40 ... Main body part, 42 ... Holding part, 44 ... Cylindrical part, 46 ... Press-fit part , 48, 50 ... cooling hole, 52 ... bottom, 54 ... side wall, 56 ... space, 58 ... terminal, 60 ... winding end, 62 ... first labyrinth wall, 64 ... second labyrinth wall, 66 ... Outer peripheral part, 68 ... peripheral wall part, 70 ... labyrinth structure, 72 ... drainage hole, 80 ... brushless motor device, 82 ... shroud, 84 ... notch part, 86 ... mounting part, 88 ... opening part, 90 ... blocking part

Claims (10)

A stator,
A rotor rotating by a rotating magnetic field formed by the stator;
A motor holder that holds the rotor shaft that supports the rotor and the stator;
A drive circuit portion having a terminal portion connected to a winding terminal portion derived from the stator;
A terminal case which is assembled to the motor holder and forms a space part for accommodating the terminal part together with the motor holder;
A first labyrinth wall erected from one side of the motor holder and the terminal case to the other side;
A labyrinth structure that is erected from the other side of the motor holder and the terminal case toward one side, is located inside the first labyrinth wall, and surrounds the terminal portion, together with the first labyrinth wall, in the space A second labyrinth wall formed inside the part;
Brushless motor with The first labyrinth wall and the second labyrinth wall are close to each other,
The brushless motor according to claim 1. The gap between the first labyrinth wall and the second labyrinth wall is such that water droplets entering between the first labyrinth wall and the second labyrinth wall can contact the first labyrinth wall and the second labyrinth wall. Set to dimensions,
The brushless motor according to claim 2. The gap between the first labyrinth wall and the second labyrinth wall is set in a range of 1 mm to 3 mm.
The brushless motor according to claim 3. The first labyrinth wall and the second labyrinth wall are formed in parallel to each other,
The brushless motor according to any one of claims 2 to 4. The first labyrinth wall and the second labyrinth wall are formed along a circumferential direction of the stator,
The brushless motor according to any one of claims 2 to 5. On the outside of the first labyrinth wall in the motor holder, a water drain hole is formed to communicate the space and the outside.
The brushless motor as described in any one of Claims 1-6. A plurality of the water drain holes are formed in a range of at least 180 degrees around the rotor shaft so as to surround the first labyrinth wall;
The brushless motor according to claim 7. A brushless motor according to claim 8;
A shroud attached to the motor holder;
With
Among the plurality of drain holes, the drain hole located on the lower side in the vertical direction in the mounting state on the installation target of the brushless motor is opened by an opening formed in the shroud,
Of the plurality of drain holes, the remaining drain holes are closed by a closing portion formed in the shroud.
Brushless motor device. A brushless motor device installation method for installing the brushless motor device according to claim 9 on the installation target,
For the brushless motor, preparing a plurality of the shrouds with different mounting angles of the brushless motor,
Selecting one of the plurality of shrouds and attaching the brushless motor to the installation object using the selected one shroud;
Installation method of brushless motor device.

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