JP2011091990A - Driving motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving motor which reduces the manufacturing cost by meeting the requests of thinning of the driving motor in a direction along an axial direction of a rotary shaft, and has waterproofness against flying rainwater together with wind. <P>SOLUTION: In the driving motor 3, a motor interior space 37 is formed by a housing 20 formed in a cylindrical shape, and a flange 21 to block an opening on the lower side of this housing 20. A stator assembly 17, a rotor assembly 19, the other end section in the axial direction of the rotary shaft 12 which has been placed lower than the flange 21 so far, and a control substrate 18, are all contained in this motor interior space 37. Then, a first elastic member 36 is disposed between one end of the axial direction of the rotary shaft 12 and the housing 20, and the other end in the axial direction of the rotary shaft 12, the stator assembly 17, and the rotor assembly 19 are fixed to the flange 21 through a second elastic member 45. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a motor that is housed in a case having a passage through which air flows, such as a blower case of a blower unit constituting a vehicle air conditioner, and drives a predetermined air conditioner such as a fan.

  In recent years, as a drive motor for a blower of an air conditioner for a vehicle or a ventilator for a hybrid vehicle, a motor that is smaller but has higher performance than a conventional product is required. Along with this, there is a demand for the development of a drive motor that is excellent in waterproofness and heat dissipation, that has a reduced size along the axial direction of the rotating shaft of the blower, and that can reduce manufacturing costs.

  In this regard, for example, an in-vehicle blower including a brushless motor as disclosed in Patent Document 1 has already been publicly known. The on-vehicle blower disclosed in Patent Document 1 generates a brushless motor that rotates a blower fan, cooling fins that are integrally formed on a metal housing of the brushless motor, and an air flow around the cooling fins. The auxiliary blade provided on the blower fan and the drive element attached in close contact with the housing to increase the cooling capacity of the drive element for the motor, and the height of the blower It is an object to reduce the manufacturing cost by reducing the number of parts while reducing the size.

JP 10-191595 A

  However, the brushless motor for an in-vehicle blower disclosed in Patent Document 1 forms a control circuit board storage chamber by providing a lower case on the lower side of the upper case, and stores the control circuit board in the control circuit board storage chamber. Therefore, since it has a configuration having a convex portion that bulges downward from the upper case, the in-vehicle blower must be installed in the duct while the convex portion protrudes out of the duct. Have.

  Further, the brushless motor of the in-vehicle blower disclosed in Patent Document 1 has a complicated structure because the cooling fin that dissipates heat generated from the elements on the control circuit board faces the blower fan side, and the structure becomes complicated. The manufacturing cost of the motor is relatively high. And although the brushless motor shown by this patent document 1 is used for the air blower for mounting on a vehicle, waterproof measures are not fully taken and also has the disadvantage that the components of a brushless motor are easy to rust. ing.

  Therefore, the present invention responds to a request for thinning the drive motor in the direction along the axial direction of the rotating shaft, reduces the manufacturing cost, and provides a drive motor that has waterproofness against rainwater flying with the wind. The purpose is to provide.

  The drive motor according to the present invention transmits a rotational force to the rotated member to rotate the rotated member. The driven motor is attached to one end of the direction along the axial direction and rotated. A rotating shaft, a rotor assembly attached to the rotating shaft and rotating with the rotating shaft, and opposed to the rotor assembly in a direction along a radial direction of the rotating shaft and arranged not to rotate with the rotating shaft And a control board that controls the rotation of the rotating shaft and the rotor assembly, and the rotor assembly, the stator assembly, and the control board are arranged at one end in the axial direction of the rotating shaft. A housing in which the other end side in the axial direction of the rotary shaft is opened while expanding in the radial direction of the rotary shaft from the vicinity of the rotary shaft. The housing is enclosed in a motor internal space defined by a flange that closes the other end of the rotating shaft in the axial direction. One end of the rotating shaft in the axial direction is rotated from the housing It protrudes outward toward the member side, and the other end portion in the axial direction of the rotating shaft is included in the motor internal space (Claim 1). Here, the rotated member includes a multi-blade fan housed in a blower case of a blower unit.

  And when the aspect of the drive motor which concerns on this invention is given, while the said control board is arrange | positioned near the one end part of the axial direction of the said rotating shaft rather than the said stator assembly and a rotor assembly, the axis | shaft of the said rotating shaft A yoke is disposed in the vicinity of the other end in the direction (Claim 2). A driving motor for a blower unit for a large air volume, and an axial direction of the rotating shaft relative to the stator assembly and the rotor assembly The control board is disposed in the vicinity of the other end of the rotary shaft, and a yoke is disposed in the vicinity of the one end in the axial direction of the rotary shaft (Claim 3). A drive motor for the blower unit is exemplified.

  As a result, in the conventional drive motor, all the parts arranged below the flange are arranged above the flange, so the lower case attached below the flange becomes unnecessary, and the lower part of the drive motor The side becomes a flat shape, and the dimension along the axial direction of the rotating shaft of the drive motor becomes relatively small by the thickness of the lower case of the conventional drive motor.

  In the drive motor according to the present invention, a first elastic member is interposed between a portion of the housing surrounding the rotation shaft and a side surface along the axial direction of the rotation shaft, and the rotation motor The shaft, the rotor assembly, and the stator assembly are fixed to the flange via a second elastic member (Claim 4). By interposing these first elastic member and second elastic member, transmission of vibrations from rotating parts such as the rotating shaft is reduced, and between the one end in the axial direction of the rotating shaft and the housing. Therefore, it is possible to prevent moisture such as rainwater from entering the motor internal space.

  On the other hand, in the drive motor according to the present invention, the rotated member includes a cone portion having a boss portion to which the rotation shaft is fixed, and the cone portion has a diameter of the rotation shaft rather than the boss portion. A first cylindrical portion that extends to the other end side in the axial direction of the rotary shaft on the outer side in the direction, and the housing extends to one end side in the axial direction of the rotary shaft and has an outer diameter A second cylindrical portion having a dimension smaller than an inner diameter dimension of the first cylindrical portion, and the first opening through which the rotating shaft can be inserted is provided in the second cylindrical portion, A flange is formed by the peripheral portion of the first opening extending toward the rotation axis, and the first cylindrical portion is inserted into the first cylindrical portion when the drive motor and the rotated member are assembled. Two cylindrical parts are accommodated, the first cylindrical part, the first cylindrical part and the second cylindrical part. It may be as those wherein the space defined by the cylindrical portion is relatively complex compartment (claim 5). Thus, the first elastic member described in claim 4 can be dispensed with, and the number of parts of the drive motor is reduced.

  Furthermore, in the drive motor according to the present invention, the housing is made of metal, and the heat radiation that promotes the release of the heat in the motor internal space to the outside of the motor internal space is formed on the surface facing the rotating member. A promotion part is provided (claim 6). Here, examples of the heat radiation promoting portion include a rib extending in a strip shape along the axial direction of the rotation shaft, a plurality of protrusions, or a plurality of depressions (dimples). This eliminates the need for heat dissipation devices such as cooling fins and heat sinks.

  As described above, according to these inventions, since all the parts arranged below the flange in the conventional drive motor are arranged above the flange, the parts are attached below the flange in the conventional drive motor. Therefore, the lower side of the drive motor can be made flat, and the dimension along the axial direction of the rotation axis of the drive motor is equal to the thickness of the lower case of the conventional drive motor, It can be made relatively small. As a result, the drive motor can be reduced in size, and even if the blower unit is installed in the duct, a part of the drive motor does not protrude outside the duct, and the drive motor and thus the layout of the blower unit can be improved. it can.

  In particular, according to the fourth aspect of the present invention, the first elastic member is interposed between the housing and one end portion of the rotating shaft in the axial direction, and the rotating shaft, the rotor assembly, and the stator assembly are connected to the second elastic member. By fixing to the flange via the member, it is possible to reduce the transmission of vibrations from rotating parts such as the rotating shaft, and the airtightness between the housing and one end of the rotating shaft in the axial direction is good. Since it is closed, it is possible to prevent moisture such as rainwater from entering the motor internal space from between the one end of the rotating shaft in the axial direction and the housing.

  In particular, according to the fifth aspect of the present invention, it is possible to prevent moisture such as rainwater from entering the motor internal space from between the one side end in the axial direction of the rotating shaft and the housing. Since members can be eliminated and the number of parts of the drive motor can be reduced, the manufacturing cost of the drive motor can be reduced.

  In particular, according to the fifth aspect of the present invention, since a heat radiating device such as a cooling fin or a heat sink is not necessary, the manufacturing cost of the drive motor can be reduced.

Fig.1 (a) is description about the ventilation unit which uses the thing concerning Example 1 among the drive motors concerning this invention, and the blower case which accommodated this ventilation unit, FIG.1 (b) is FIG. It is AA sectional view taken on the line of a). FIG. 2 is a cross-sectional view illustrating the configuration of the drive motor according to the first embodiment. FIG. 3 is an explanatory diagram showing an external configuration of the drive motor according to the first embodiment, in particular, a structure of the heat radiation promoting portion. FIG. 4A is an explanatory view showing the configuration of the control board used in the drive motor according to the first embodiment, particularly the configuration on the bottom side, and FIG. 4B is the same as the first embodiment. It is explanatory drawing which showed the structure of the flange used for the drive motor which concerns, especially the structure of the upper surface side. FIG. 5 is an explanatory diagram illustrating a configuration of a first elastic member used in the drive motor according to the first embodiment. FIG. 6 is an explanatory diagram illustrating another configuration example of the heat dissipation promoting unit illustrated in FIG. 3 in the drive motor according to the first embodiment. FIG. 7 is a cross-sectional view showing a modified example of the drive motor shown in FIG. 2 in which the first elastic member is not necessary in the cylindrical space between the housing and the rotating shaft. FIG. 8A is an explanation of a blower unit using the drive motor according to the second embodiment of the drive motor according to the present invention and a blower case containing the blower unit. FIG. It is BB sectional drawing of a). FIG. 9 is a cross-sectional view showing the configuration of the drive motor according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described by dividing them into a first embodiment and a second embodiment with reference to the accompanying drawings.

  First, the blower unit 1 according to the first embodiment will be described with reference to FIGS. 1 to 6.

  The blower unit 1 is disposed, for example, on the downstream side of the battery to cool a battery (not shown), and is used for sucking and discharging air warmed by the battery, and is for a small air volume. The scroll blower case 2, the drive motor 3, and the multiblade fan 4 are configured.

  The blower case 2 is made of resin or the like, and is arranged in such a manner that the bell mouth 5 has an upper wall 7 having an opening 6 provided integrally or separately, and is opposed to the upper wall 7 with a predetermined interval. A lower side wall 9 in which a motor insertion hole 8 for attaching the drive motor 3 is formed, and an outer peripheral wall 10 provided in such a manner that the discharge port 11 is left so as to connect the outer peripheral edges of the upper side wall 7 and the lower side wall 9. It is comprised. The outer peripheral wall 10 is formed in a spiral shape starting from the winding start portion 10a and extending along the circumferential direction of the multi-blade fan 4 from here to the distance from the center of the multi-blade fan 4 gradually increasing.

  The multiblade fan 4 is known per se, and as shown in FIGS. 1 and 2, a boss portion 13 fixed to a rotating shaft 12 of the drive motor 3 described below and a boss portion 13 connected to the boss portion 13. And a plurality of blades 15 provided along the circumferential direction of the outer peripheral edge of the cone portion 14 and standing along the axial direction of the rotary shaft 12. The air that is defined by 15 and flows in from the suction port 27 that faces the cone portion 14 is guided to the blade 15 side along the cone portion 14 and passes between the blade 15 and the blade 15. ing.

  As shown in FIGS. 1, 2, and 3, the drive motor 3 includes a rotating shaft 12, a boss housing 16, a stator assembly 17 attached to the outer peripheral surface of the boss housing 16, a control board 18, The rotor body 19, the housing 20, and the flange 21 constitute a motor body 22.

  Among these, the rotating shaft 12 has a substantially circular rod shape, and a rotating member such as the multiblade fan 4 is attached to one end which is the upper end side in the longitudinal direction. The rotating member is rotatable. The rotating shaft 12 is rotatably supported via bearings 23 and 24 on a cylindrical boss housing 16 extending downward along the axial direction of the rotating shaft 12 from a housing 20 having the following configuration.

  A stator assembly 17 is disposed on the outer peripheral surface of the boss housing 16 that extends along the axial direction of the rotary shaft 12. The stator assembly 17 includes an iron core and armature windings wound around the side outer peripheral surface of the core a plurality of times. The stator assembly 17 is attached to the inner surface of the flange 21 via the boss housing 16 and further via a second elastic member 45 described later.

  Further, the rotor shaft 19 is attached to the rotating shaft 12 on the upper side of the rotating shaft 12 in the axial direction from the stator assembly 17. The rotor assembly 19 faces the stator assembly 17 in a direction along the radial direction of the rotating shaft 12, and the inner surface of the yoke 25 faces the yoke 25 and the armature winding of the stator assembly 17. And a magnet 26 provided on the head. The magnet 26 is, for example, a sintered ferrite magnet.

  With this configuration, the drive motor 3 rotates the rotor assembly 19 with the rotating magnetic field generated by the stator assembly 17, and further rotates the rotating shaft 12 with the rotation of the rotor assembly 19.

  Furthermore, the drive motor 3 includes a relatively thin plate-like control board 18 on which electronic components for controlling the current supplied to the armature winding of the stator assembly 17 are switched by an electronic switch. Have. More specifically, the control board 18 includes a capacitor 29, a heat dissipation component 30 such as a transistor, and the like. In the first embodiment, the control board 18 is disposed on the lower end side of the stator assembly 17 and the rotor assembly 19 in the direction along the axial direction of the rotary shaft 12, and includes a capacitor 29, a transistor, and the like. The heat radiating component 30 is also arranged on the bottom surface side of the control board 18.

  The housing 20 is in the vicinity of the end of the rotating shaft 12 on the boss portion 13 side and at the end opposite to the boss portion 13 side of the rotating shaft 12 while expanding from the periphery of the rotating shaft 12 in the radial direction of the rotating shaft 12. It extends in the direction opposite to the boss portion 13 side and is opened to be larger than the boss portion 13 side. The overall shape is a cylindrical shape in which both sides in the axial direction of the rotating shaft are open and from the radial direction of the rotating shaft. It looks like an open umbrella. The open end of the housing 20 extends outward in the radial direction of the rotary shaft 12 to form a collar portion 20a. The housing 20 is formed using a material having excellent thermal conductivity, for example, a metal such as aluminum.

  The flange 21 can close the open side located opposite to the boss portion 13 of the housing 20, and as shown in FIGS. 2 and 4B, at least the flange portion 20 a of the housing 20. A recessed portion 32 that can be joined to the end portion is formed, and a recessed portion 33 is opened at a central portion thereof so as to face the housing 20 side. Further, a plurality of projections 34 are provided on the bottom surface of the recess 33 of the flange 21, and an insertion portion 34 a is formed on the top of the projection 34. The insertion portion 34a of the projection 34 can be inserted into the insertion hole 35 formed on the bottom surface side of the control board 18 shown in FIG. 4A, and as shown in FIG. 34 can be a support column that supports the control board 18 from the flange 21 side. The flange 21 is made of a resin such as polypropylene (PP) resin. But you may make it form the metal about the flange 21 as a raw material.

  Therefore, by assembling the housing 20 and the flange 21 to each other using the bolts 28, a motor internal space 37 is formed in the drive motor 3 as shown in FIG. The motor internal space 37 includes at least the end portion on the opposite side of the control board 18 and the rotating shaft 12 from the boss portion 13, and the stator assembly 17 and the rotor assembly 19 in the space above the control board 18. Is included. In the motor internal space 37, a lower space portion is formed below the control board 18 mainly using the recess 33 of the flange 21, and a heat dissipation component 30 such as a capacitor 29 or a transistor is disposed in the lower space portion. Has been. Here, the recessed portion 33 is only required to be able to arrange small electronic components such as the capacitor 29 and the transistor, and is, for example, a small space having an axial dimension of 10 mm or less.

  Therefore, in the drive motor 3 according to the first embodiment, since all the parts arranged below the flange 21 in the conventional drive motor are arranged above the flange 21, the flange 21 in the conventional drive motor is arranged. Since the lower case attached below is not required, the lower side of the drive motor 3 is formed in a substantially flat shape as shown in FIG. 1B and FIG. In addition, it is possible to avoid the drive motor 3 from protruding outside the duct, and the layout of the drive motor 3 when the blower unit 1 is mounted on a vehicle or the like can be improved. As the drive motor 3 is configured as described above, the dimension H1 (shown in FIG. 1B) along the axial direction of the rotary shaft 12 of the drive motor 3 is set to the lower case of the conventional drive motor. The thickness can be made relatively small.

  Further, the portion in the vicinity of the boss portion 13 that becomes the starting end side of the flange 21 and that faces the side peripheral surface of the rotary shaft 12 rotates between the side peripheral surface of the rotary shaft 12 as shown in FIG. An annular space 39 extending in a cylindrical shape along the axial direction of the shaft 12 is provided, and a first elastic member 36 formed of a material having elasticity is interposed in the annular space 39.

  The first elastic member 36 is formed of, for example, nitrile rubber (NBR) or the like, and as shown in FIG. 5, an annular plate-like bottom wall portion 40 having a circular hole 41 at the center, An outer peripheral wall portion 42 that has a shape extending from the outer peripheral edge of the bottom wall portion 40 along the axial direction of the circular hole 41 and is in contact with the inner peripheral surface of the flange 21 when mounted in the annular space 39; The wall 40 has a shape in which the thickness gradually decreases along the axial direction of the circular hole 41 from the inner peripheral edge of the wall portion 40 and extends in an oblique direction. And an inner peripheral wall portion 43 in contact with the side peripheral surface. In this embodiment, the first elastic member 36 includes a leaf spring 44 extending from the outer peripheral wall portion 42 to the bottom wall portion 40 as shown in FIG.

  Thus, the first elastic member 36 is mounted between the housing 20 and the rotary shaft 12 with good airtightness and in a state where the rotary shaft 12 is rotatable and functions as a sealing material. It is possible to prevent water or the like from entering the motor internal space 37 from between the rotary shaft 12 and the rotating shaft 12 and to prevent magnetic vibration and rotational vibration of the rotating shaft 12 from being transmitted to the housing 20.

  Further, in this embodiment, at least the rotating shaft 12, the boss housing 16, and the rotor assembly 19 are fixed to the flange 21 via the second elastic member 45 shown in FIGS. 2 and 4B. The second elastic member 45 is formed of an elastic material. As shown in FIG. 4B, the second elastic member 45 is a plurality of holes extending radially and linearly from the through hole 46. And the strip-shaped portion 47. Further, as shown in FIG. 4A, an extension portion 16a extending radially from the boss housing 16 is formed on the bottom surface side of the control board 18, and the extension portion 16a has a distal end in the extension direction. A protrusion 48 having an outer diameter that can be inserted into the through hole 46 of the second elastic member 45 is formed. As a result, the second elastic member 45 prevents magnetic vibration and rotational vibration from the rotating body such as the rotating shaft 12, the stator assembly 17, and the rotor assembly 19 from being transmitted to the flange 21.

  On the other hand, as a modification of the embodiment shown in FIG. 2, the drive motor 3 has a combination of a housing 20 and a cone portion 14 constituting a rotated member such as the multiblade fan 4 as shown in FIG. It is good also as a structure which does not have the 1st elastic member 36. FIG. In other words, the cone portion 14 is located on the motor internal space 37 side (the other end side in the axial direction of the rotating shaft 12) in a shape along the axial direction of the rotating shaft 12 outside the boss portion 13 in the radial direction of the rotating shaft 12. ) Has a cylindrical portion 56 extending toward the top. The housing 20 has a cylindrical portion 57 extending toward the boss portion 13 (one end side in the axial direction of the rotating shaft 12) along the axial direction of the rotating shaft 12. The outer diameter dimension of the shaped portion 57 is relatively smaller than the inner diameter dimension of the cylindrical portion 56, while the inner diameter dimension forms a cylindrical space 39 between the rotary shaft 12 and the inner diameter dimension. The size is possible. The end of the tubular portion 57 on the boss portion 13 side has a through hole 58 through which the rotary shaft 12 can be inserted, and the peripheral edge of the through hole 58 is connected to the rotary shaft 12 along the radial direction of the rotary shaft 12. A flange 59 extending toward the top is formed.

  Thus, when the driven member such as the multi-blade fan 4 and the drive motor 3 are assembled, the cylindrical portion 57 of the housing 20 is accommodated in the cylindrical portion 56 of the cone portion 14, and the cylindrical portion 56 and the cylindrical portion A complex space (labyrinth space) consisting of a portion extending along the axial direction of the rotating shaft 12 and a portion extending along the radial direction of the rotating shaft 12 above the space portion is formed between the cylindrical portions 57. Partitioned. Therefore, it is possible to prevent external moisture from entering the motor internal space 37 from the through hole 58 and the cylindrical space 39, so that the first elastic member 36 is unnecessary.

  Furthermore, as shown in FIG. 4A, a connection device 49 having a spring function is provided on the bottom surface side of the control board 18, and the connection board 49 connects the control board 18 and the stator assembly 17 to each other. In addition to securing an electrical path, magnetic vibration and rotational vibration from a rotating body including the rotating shaft 12 are suppressed from being transmitted to the control board 18.

  On the other hand, for example, a silicon adhesive is applied between the end portion of the control board 18 and the flange portion 20a of the housing 20, so that the heat generated from the heat radiation component 30 such as a transistor is transferred to the control board 18. After being transmitted to the housing 20 through the silicon adhesive, the heat is radiated from the housing 20 to the outside. And in the part where the heat from the control board 18 of the housing 20 is transmitted, as shown in FIG. 1B, FIG. 2 and FIG. Is formed. Thereby, the rib 51 functions as a heat radiation promoting part that promotes heat radiation from the housing 20, and heat radiation from the housing 20 can be performed more efficiently.

  Instead of the ribs 51, the housing 20 may be configured to increase the surface area by providing a plurality of projections 52 as shown in FIG. 6 as a heat dissipation promoting part that promotes heat dissipation from the housing 20. . Although not shown, a plurality of dents (dimples) recessed inside the housing 20 may be provided to increase the surface area of the housing 20.

  In this way, the material of the housing 20 is made of aluminum or the like having excellent thermal conductivity, and a silicon adhesive is applied between the control board 18 and the housing 20, and further heat dissipation is promoted to promote heat dissipation from the housing 20 to the housing 20. By providing ribs 51, protrusions 52, dents (dimples), and the like as parts, a heat dissipation device such as a heat sink can be dispensed with.

  The blower unit 1 according to the second embodiment will be described with reference to FIGS. 8 and 9. However, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is basically omitted.

  As shown in FIGS. 8 and 9, the drive motor 3 according to the second embodiment also includes a rotating shaft 12, a boss housing 16, a stator assembly 17 mounted on the outer peripheral surface of the boss housing 16, and a control board 18. The motor body 22 is formed by the rotor assembly 19, the housing 20, and the flange 21.

  The rotating shaft 12 has a rotating member such as the multi-blade fan 4 attached to one end thereof so that the rotating member such as the multi-blade fan 4 can be rotated, and the boss housing 16 is provided with bearings 23 and 24 via the bearings 23 and 24. And is rotatably supported.

  Further, a stator assembly 17 is disposed outside the outer peripheral surface extending along the axial direction of the rotating shaft 12 of the boss housing 16, and the stator assembly 17 is interposed via the boss portion 13 and further via the second elastic member 45. And attached to the inner surface of the flange 21. Further, the rotor shaft 19 is attached to the rotating shaft 12 below the stator assembly 17 in the axial direction of the rotating shaft 12. The rotor assembly 19 is located at a position facing the stator assembly 17 in a direction along the radial direction of the rotary shaft 12.

  The drive motor 3 has a control board 18 on which electronic components that perform control such as switching of the current supplied to the armature winding of the stator assembly 17 with an electronic switch are disposed. More specifically, the control board 18 includes a heat dissipation component 30 such as a transistor. The control board 18 is arranged on the upper end side in the direction along the axial direction of the rotary shaft 12 relative to the stator assembly 17 and the rotor assembly 19.

  The housing 20 is basically formed of the same configuration and material as in the first embodiment. That is, the housing 20 is in the vicinity of the end of the rotating shaft 12 on the boss portion 13 side and extends from the periphery of the rotating shaft 12 in the radial direction of the rotating shaft 12 while being opposite to the boss portion 13 side of the rotating shaft 12. While extending toward the portion, the side opposite to the boss portion 13 is opened, and the overall shape thereof is a substantially open umbrella shape. The housing 20 is made of a material having excellent thermal conductivity, for example, a metal such as aluminum. In this embodiment, the housing 20 has a boss housing 16 that extends downward along the axial direction of the rotary shaft 12 from the vicinity of the outer edge of the inner surface. The flange 21 can close the open side of the housing 20, and as shown in FIG. 9, the flange portion 33 is opened at the central portion thereof so as to face the housing 20 side.

  Thereby, the motor internal space 37 is formed in the drive motor 3 as shown in FIG. 9 by assembling the housing 20 and the flange 21 to each other. The motor internal space 37 includes at least the end portion opposite to the boss portion 13 of the control board 18 and the rotating shaft 12, and the stator assembly 17 and the rotor assembly 19 in a space section below the control board 18. Is included. In the motor internal space 37, an upper space portion is formed above the control board 18, and a heat dissipation component 30 such as a transistor is disposed in this space portion. Here, the recessed portion 33 is only required to be able to arrange small electronic components such as the capacitor 29 and the transistor, and is, for example, a small space having an axial dimension of 10 mm or less.

  Therefore, even in the drive motor 3 according to the second embodiment, since all the parts arranged below the flange 21 in the conventional drive motor are arranged above the flange 21, the flange 21 in the conventional drive motor is arranged. Since the lower case attached below is not required, as shown in FIG. 8B and FIG. 9, the lower side of the drive motor 3 has a substantially flat shape, and the blower unit 1 is installed in the duct. In addition, it is possible to avoid the drive motor 3 from protruding from the duct, and the layout of the drive motor 3 when the blower unit 1 is mounted on a vehicle or the like can be improved. As the drive motor 3 is configured as described above, the dimension H2 (shown in FIG. 8B) along the axial direction of the rotary shaft 12 of the drive motor 3 is set to the lower case of the conventional drive motor. The thickness can be made relatively small.

  In the drive motor 3 according to the second embodiment, silicon grease 53 is applied around the heat dissipation component 30 such as a transistor. Thereby, the heat generated by the heat dissipation component 30 is transmitted to the housing 20 through the silicon grease 53 and is radiated to the outside from the housing 20. In the drive motor 3 according to the second embodiment, a heat radiation promoting part such as the rib 51 shown in FIG. 9 may be provided. As a result, heat can be radiated from the housing 20 by the heat radiating promotion portions such as the housing 20 and the rib 51, and further, the heat radiated can be promoted, so that the heat radiated from the housing 20 can be efficiently performed. And a heat dissipation device such as a heat sink can be eliminated.

  Further, in the drive motor 3 according to the second embodiment, an elastic member 54 is interposed between the housing 20 and the flange 21. Thereby, the rotational vibration and magnetic vibration generated in the rotating body such as the rotor assembly 19 are shielded by the elastic member 54, and the transmission of the vibration to the flange 21 is suppressed. Furthermore, by using an upper bearing 23 interposed between the rotary shaft 12 and the housing 20 as a ball bearing, the bearing 23 suppresses rainwater flying with the wind from entering the motor internal space 37. It is possible.

  In addition, although the embodiment of the invention has been described by taking the outer rotor type motor in which the rotor assembly rotates on the outer periphery of the stator assembly in both the first and second embodiments as an example, it should be understood that the present invention is not limited to the stator assembly. It is also possible to apply the inner peripheral side of the motor to an inner rotor type motor in which the rotor assembly rotates. Moreover, this drive motor can be used in the ventilation unit of a vehicle air conditioner.

DESCRIPTION OF SYMBOLS 1 Blower unit 2 Blower case 3 Drive motor 4 Multiblade fan 12 Rotating shaft 13 Boss part 14 Cone part 15 Blade 17 Stator assembly 18 Control board 19 Rotor assembly 20 Housing 21 Flange 23 Bearing 25 Yoke 26 Magnet 30 Heat radiation component 36 1st Elastic member 37 Motor internal space 39 Cylindrical space 45 Second elastic member 51 Rib (heat dissipation promoting portion)
52 Protrusion (heat dissipation promotion part)
54 Elastic member 56 Tubular part 57 Tubular part 58 Through hole 59 Flange

Claims (6)

A rotational force is transmitted to the rotated member to rotate the rotated member,
A rotating shaft for attaching and rotating the rotated member to one end of a direction along the axial direction, a rotor assembly attached to the rotating shaft and rotating together with the rotating shaft, and the rotation with respect to the rotor assembly A stator assembly that faces the direction along the radial direction of the shaft and is arranged so as not to rotate together with the rotating shaft, and a control board that controls the rotation of the rotating shaft and the rotor assembly,
The rotor assembly, the stator assembly, and the control board are extended in the axial direction of the rotary shaft in the vicinity of one end in the axial direction of the rotary shaft and from the periphery of the rotary shaft in the radial direction of the rotary shaft. A motor internal space defined by a housing that is open on the other end side thereof and a flange that closes the other end side in the axial direction of the rotating shaft of the housing,
One end of the rotating shaft in the axial direction protrudes outward from the housing toward the rotated member side, and the other end of the rotating shaft in the axial direction is included in the motor internal space. A drive motor characterized by that.   The control board is disposed in the vicinity of one end portion of the rotating shaft in the axial direction than the stator assembly and the rotor assembly, and a yoke is disposed in the vicinity of the other end portion in the axial direction of the rotating shaft. The drive motor according to claim 1.   The control board is disposed near the other end in the axial direction of the rotating shaft than the stator assembly and the rotor assembly, and a yoke is disposed near one end in the axial direction of the rotating shaft. The drive motor according to claim 1.   A first elastic member is interposed between a portion of the housing surrounding the rotation shaft and the rotation shaft, and the rotation shaft, the rotor assembly, and the stator assembly are interposed via a second elastic member. 4. The drive motor according to claim 1, wherein the drive motor is fixed to the flange. 5. The rotating member includes a cone portion having a boss portion to which the rotation shaft is fixed, and the cone portion is the other side in the axial direction of the rotation shaft at a radially outer side of the rotation shaft than the boss portion. A first tubular portion extending toward the end of the
The housing includes a second cylindrical portion that extends toward one end in the axial direction of the rotating shaft and has an outer diameter that is smaller than an inner diameter of the first cylindrical portion. The first opening through which the rotating shaft can be inserted is provided in the cylindrical portion, and a peripheral portion of the first opening extends toward the rotating shaft, thereby forming a flange.
When the drive motor and the rotated member are assembled, the second cylindrical portion is accommodated in the first cylindrical portion, and the first cylindrical portion, the first cylindrical portion, and the 4. The drive motor according to claim 1, wherein a space defined by the second cylindrical portion is relatively complicatedly partitioned.   The housing is made of metal, and a heat radiation promoting portion is provided on a surface facing the rotated member to promote the release of heat in the motor internal space to the outside of the motor internal space. The drive motor according to claim 1, claim 2, claim 3, claim 4, or claim 5.

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