JP5430211B2 - Drive motor - Google Patents

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, for example, and more particularly to a housing of the drive motor.

  In recent years, as a drive motor for a blower of a vehicle air conditioner or a hybrid vehicle ventilation system, it is necessary to have a smaller but higher performance than conventional products. There is a demand for the development of a drive motor that is excellent and that has a reduced size along the axial direction of the rotating shaft of the blower and that is also capable of reducing 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, in the brushless motor of the in-vehicle blower disclosed in Patent Document 1, in order to make the control circuit board waterproof, the lower part of the upper case is placed so as to accommodate the control circuit board separately from the scroll chamber above the upper case. Since the control circuit board storage chamber is provided with a lower case on the side, and cooling fins are provided for heat dissipation of the control circuit board, the brushless motor and the blower are actually relatively large, and the cooling fins As a result, the structure is complicated, and the manufacturing cost of the brushless motor is relatively high.

  Accordingly, the present invention provides a drive motor that has a simple structure and is excellent in waterproofness and heat dissipation, meets the demand for a thinner drive motor, and further reduces its manufacturing cost. With the goal.

  The drive motor according to the present invention is configured to attach a rotating member such as a fan to one end of a direction along the longitudinal direction and rotate the rotating shaft, and to rotate with the rotating shaft attached to the rotating shaft. A rotor assembly that is configured to face the rotor assembly in a direction along a radial direction of the rotating shaft, and disposed so as not to rotate with the rotating shaft; A control board provided at a position close to the one end side in a direction along the axial direction of the rotation shaft, and one end portion of the control board in a direction along the longitudinal direction of the rotation shaft. The control board, the rotor assembly, and the stator assembly are formed so as to extend outward along the radial direction of the rotating shaft at a side position. A motor body is formed by winging, and the housing is formed of metal, and attached to a case in which the air passage is defined inside, so that the outer surface of the air passage is exposed to the air passage. The stator assembly contained in the housing is fixed to the inner surface of the housing (claim 1). Here, examples of the case in which the air passage is defined inside include a blower case. Further, the stator assembly may be arranged on the outer peripheral side as well as the inner peripheral side of the rotor assembly as long as it is in the radial direction of the rotating shaft with respect to the rotor assembly.

  As a result, a metal housing that encloses the control board, the rotor assembly, and the stator assembly covers the control board, the rotor assembly, and the stator assembly in an umbrella shape from above, so that the control board has a waterproof function. This eliminates the need for a special control board storage chamber for storing the control board. In addition, a motor body such as a control board, a rotor assembly, and a stator assembly is formed in a housing that is made of metal having excellent thermal conductivity and whose outer surface is exposed to a blower passage of a case such as a blower case. Since all the parts are gathered, heat from the stator assembly fixed to the inner surface of the housing is transferred to the housing, and heat from the control board is also transferred to the housing, and the outer surface of the housing faces the air passage of the case Therefore, it is possible to dissipate heat from the outer surface of the housing against heat generated from the stator assembly and the control board. Further, since the control board, the rotor assembly, and the stator assembly are contained in the housing in a compact manner, it is possible to reduce the thickness by reducing the thickness in the direction along the axial direction of the rotation shaft with respect to the drive motor.

  Moreover, by arranging the transistor on the upper surface of the control board on the housing side, the control board and the transistor having a relatively large heat generation among the members contained in the housing are protruded into the blower passage of the housing. Since it can arrange | position in a part, it becomes possible to further promote the thermal radiation effect with respect to a control board | substrate and a transistor.

  And in the drive motor which concerns on this invention, the said motor main-body part is the said case via the flange provided in the end surface on the opposite side to the said control board among the sides along the axial direction of the said rotating shaft of the said housing. And is configured such that an elastic member is interposed between the housing and the flange.

  As a result, the gap between the housing and the flange is sealed by the elastic member, and water can be prevented from entering through the gap between the housing and the flange. Accordingly, it is not necessary to attach a waterproof seal member. can do. In addition, since the magnetic vibration generated by the rotor or the like housed in the housing is blocked by the elastic member and is not easily transmitted to the flange, it is possible to reduce the noise of the drive motor.

  Furthermore, in the drive motor according to the present invention, a portion of the elastic member that faces the base end side of the housing has a plurality of strip-shaped irregularities (claim 3). Thereby, since the vibration absorption effect of the elastic member is enhanced, it is possible to further reduce the noise of the drive motor.

  As described above, according to these inventions, the metal housing that encloses the control board, the rotor assembly, and the stator assembly covers the control board, the rotor assembly, and the stator assembly in an umbrella shape from above. Therefore, it is possible to provide a waterproof function, and it is not necessary to provide a control board storage chamber for storing the control board. In addition, a motor body such as a control board, a rotor assembly, and a stator assembly is formed in a housing that is made of metal having excellent thermal conductivity and whose outer surface is exposed to a blower passage of a case such as a blower case. Since all the parts are gathered, the heat from the stator assembly is transferred to the housing, and the heat from the control board is also transferred to the housing. Since the outer surface of the housing faces the air passage of the case, the stator assembly and the control board Because it is possible to dissipate heat from the outer surface of the housing against heat generated from the housing, it is possible to promote a decrease in the temperature of the entire drive motor. It is possible to reduce the size and manufacturing cost while improving.

  According to these inventions, since the control board, the rotor assembly, and the stator assembly are included in the housing, it is possible to reduce the thickness of the drive motor in the direction along the axial direction of the rotation shaft. It becomes possible.

  Furthermore, according to these inventions, among the control board, the rotor assembly, and the stator assembly contained in the housing, the control board having a relatively large heat generation amount is disposed in a portion of the housing that protrudes further in the air passage. Therefore, the heat dissipation effect on the control board can be further promoted. In addition, by disposing the transistor on the upper surface of the control board on the housing side, it is possible to further promote the heat dissipation effect on the transistor. The configuration of the present invention can be applied to both inner rotor type and outer rotor type drive motors.

  In particular, according to the second aspect of the present invention, the gap between the housing and the flange is sealed by the elastic member, so that water can be prevented from entering through the gap between the housing and the flange. Therefore, it is possible to eliminate the need for attaching a sealing member. In addition, since the magnetic vibration generated by the rotor or the like housed in the housing is blocked by the elastic member and is not easily transmitted to the flange, it is possible to reduce the noise of the drive motor.

  In particular, according to the third aspect of the present invention, the vibration absorbing effect of the elastic member is enhanced, so that the noise of the drive motor can be further reduced.

FIG. 1 is an explanatory diagram of a blower unit that uses a drive motor according to the present invention and a blower case that houses the blower unit. FIG. 1A illustrates a state in which the blower unit is housed in a blower case. Sectional drawing of the state seen from the axial direction upper side of FIG. 1, FIG.1 (B) is an AA sectional view taken on the line of FIG. 1 (A). FIG. 2 is a cross-sectional view showing a schematic configuration of the above-described drive motor, and particularly shows an outer rotor type drive motor. FIG. 3 is an explanatory view showing a state of the flange constituting the drive motor as seen from the mounting side to the motor body.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In FIG. 1, a blower unit 1 is disposed on the downstream side of a battery, for example, to cool a battery (not shown), and is used to suck and discharge air warmed by the battery. It has a case 2, a drive motor 3, and a multiblade fan 4.

  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 20 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 multi-blade fan 4 is known per se, and includes a boss portion 12 fixed to a rotary shaft 11 described below of the drive motor 3, a cone portion 13 connected to the boss portion 12, and a shaft of the rotary shaft 11. And a plurality of blades 14 provided along the circumferential direction of the outer peripheral edge of the cone portion 13, and the cone portion 13 defined by these blades 14. The air that has flowed in from the suction inlet 15 that faces is guided to the blade 14 side along the cone portion 13, and passes between the blade 14 and the blade 14.

  As shown in FIG. 2, the drive motor 3 includes a rotating shaft 11, a boss portion 31b, a stator assembly 22 mounted on the outer peripheral surface of the boss portion 31b, a control board 28, a rotor assembly 21, and a housing. The motor main body 30 is formed by 31.

  Among these, the rotating shaft 11 has a substantially circular rod shape, and a rotating member such as the multiblade fan 4 is attached to one side end which is the upper end portion side in the longitudinal direction, whereby the rotating blade 11 such as the multiblade fan 4 is covered. The rotating member is rotatable. The rotating shaft 11 is rotatably supported by bearings 23 and 24 on a cylindrical boss portion 31b extending downward along the axial direction of the rotating shaft 11 from a housing 31 described below.

  The stator assembly 22 is disposed on the lower side of the outer peripheral surface extending along the axial direction of the rotating shaft 11 of the boss portion 31b. The stator assembly 22 includes an iron core 26 and an armature winding 25 wound around the side outer peripheral surface of the core 26 a plurality of times. And the stator assembly 22 is being fixed to the inner surface of the housing 31 via the boss | hub part 31b.

  Further, the rotor assembly 21 is attached to the rotating shaft 11 below the stator assembly 22 in the axial direction of the rotating shaft 11. The rotor assembly 21 is at a position facing the stator assembly 22 in the direction along the radial direction of the rotary shaft 11, and the yoke 29 and the yoke 29 are opposed to the armature winding 25. It is comprised with the magnet 27 provided in the inner surface.

  With such a configuration, the drive motor 3 rotates the rotor assembly 21 with a rotating magnetic field generated by the stator assembly 22, and further rotates the rotating shaft 11 with the rotation of the rotor assembly 21.

  Furthermore, the drive motor 3 has a control board 28 on which electronic parts for controlling the current supplied to the armature winding 25 of the stator assembly 22 to be switched by an electronic switch are arranged. The substrate 28 is disposed on the upper end side in the direction along the axial direction of the rotary shaft 11 with respect to the stator assembly 22 and the rotor assembly 21.

  The drive motor 3 extends outward along the radial direction of the rotary shaft 11 at a position on the upper end side of the control board 28 in the direction along the longitudinal direction of the rotary shaft 11, and then the rotary shaft 11. The housing main body 31a is formed in an umbrella shape by extending substantially along the axial direction, a cylindrical boss 31b extending from the approximate center of the housing main body 31a along the axial direction of the rotary shaft 11, and the housing main body 31a. A housing 31 having a boss portion 31c extending downward along the axial direction of the rotary shaft 11 from a portion in the vicinity of the outer edge of the inner surface.

  Accordingly, the housing 31 includes all components constituting the motor main body 30 such as the control board 28, the stator assembly 22, and the rotor assembly 21 by the housing main body 31a formed in an umbrella shape. In addition, as described above, the rotary shaft 11 is rotatably supported by the boss portion 31b via the bearings 23 and 24, and the screw 39 is connected by communicating the hole of the control board 28 and the hole of the boss portion 31c. The control board 28 is attached to the housing 31 by being inserted and screwed into the holes of the control board 28 and the boss portion 31c. In addition, the control board 28 is disposed closer to the housing body 31 a side of the housing 31 in the direction along the axial direction of the rotating shaft 11 than the stator assembly 22 and the rotor assembly 21.

  A transistor 37 is disposed on the upper surface of the control board 28. Silicon grease 38 is applied to the periphery of the transistor 37, and the heat of the transistor 37 is transmitted to the housing body 31 a of the housing 31 through the silicon grease 38 so that the heat can be dissipated.

  In order to attach the drive motor 3 to the blower case 2 on the lower end side (the side opposite to the side on which the rotating shaft 11 is projected), which is the opening side in the housing 31 of the motor main body 30, for example, resin A flange 32 made of metal is attached.

  The multiblade fan 4 is housed in the blower case 2 so that the suction port 15 is close to the opening 6 of the blower case 2, and the motor main body 30 of the drive motor 3 is disposed inside the blower case 2. 1 is attached to the lower side wall 9 of the blower case 2 via the flange 32 so as to protrude to the side of the blower case 2 as shown in FIG. 4 and the inner surface of the blower case 2 define a scroll-like air passage 40 that pumps air sent from the space between the blades of the multiblade fan 4 to the radially outer side of the rotary shaft 11 toward the discharge port 20. Has been.

  That is, if the dimension (H) along the axial direction of the rotating shaft 11 of the blower unit 1 itself is set to be the same as that of the conventional blower unit, the lower side wall 9 of the blower case 2 is provided at the lower end of the motor main body 30. The dimension along the axial direction of the rotating shaft 11 of the outer peripheral wall 10 is larger than the conventional one so as to contact the flange 32 formed, and the air passage 40 is expanded to reach the flange 32 provided at the lower end of the motor main body 30. doing. For this reason, in the past, the motor body containing the control board and the like was placed outside the blower case, and the periphery of the motor body became a dead space and was not used effectively. In FIG. 2, the periphery of the motor main body 30 is used as the air blowing path 40.

  By the way, the housing 31 of the motor main body 30 of the drive motor 3 has an outer surface in the air passage 40 that is enlarged as described above as shown in FIGS. Furthermore, the housing 31 is made of a material having excellent thermal conductivity, for example, a metal such as aluminum. The blower case 2 may be configured by connecting a plurality of case members with a fixture.

However, with the arrangement and configuration of the housing 31 of the motor main body 30, even if the control board 28 and the stator assembly 22 contained in the housing 31 generate heat, the outer surface of the housing main body 31 of the housing 31 (particularly its surface). Since the lateral outer surface is exposed to the air passage 40, the heat generated from the control board 28 and the stator assembly 22 is transmitted to the housing 31 having high thermal conductivity, and further from the outer surface of the housing body 31a of the housing 31. Since heat can be radiated , the drive motor 3 can be radiated with a simple structure without using a heat radiating device such as a heat sink . Along with this, it is possible to reduce the relative manufacturing cost of the blower unit 1 by reducing the number of parts, and to further reduce the size of the drive motor 3 and thus the blower unit 1.

  The heat generated from the control board 28, particularly the heat of the transistor 37, is provided so that the silicon grease 38 applied around the transistor 37 is filled with the adjacent housing 31. Heat dissipation to the (air blowing path 40) is possible. Further, since heat generated by the current flowing through the armature winding 25 is also transmitted to the boss 31c of the housing 31 through the iron core 26, heat can be radiated to the outside (the air blowing path 40) through the housing 31. . Further, since the air in the housing 31 is agitated by the rotor assembly 21, it is convenient for heat radiation of the heat-generating components stored in the housing 31.

  Moreover, in this embodiment, the control board 28 is disposed on the multiblade fan 4 side of the stator assembly 22 and the rotor assembly 21 in the housing 31, so that the control board 28 is closer to the housing 31 than other devices. Since the housing 31 is located close to the side where the air flow by the multi-blade fan 4 is large, the heat radiation effect through the housing 31 can be better obtained.

  Further, the drive motor 3 has an elastic member 33 interposed between the housing 31 and the flange 32 as shown in FIGS. The elastic member 33 has an annular shape and has an insertion portion 35 for being fixed to the flange 32 by engaging with an engagement hole 36 extending along the thickness direction of the flange 32. The housing 31 and the flange 32 are fixed by passing screws (not shown) through the plurality of through holes 41 shown in FIG. 3 and attaching them to screw receiving holes (not shown) provided in the housing 31. For example, it is performed by a known means. As described above, by interposing the elastic member 33 between the housing 31 and the flange 32, magnetic vibration generated in the rotor assembly 21 and the like housed in the housing 31 is blocked by the elastic member 33 and transmitted to the flange 32. Since it becomes difficult, the noise of the drive motor 3 can be reduced. Further, since the elastic member 33 also has a function of preventing water from entering through the gap between the housing 31 and the flange 32, it is possible to eliminate the need for attaching a waterproof seal member. The elastic member 33 is made of a material generally used in a vehicle air conditioner such as EPDP (ethylene-propylene-diene rubber), butyl rubber, or a polymer compound called an elastomer.

  As shown in FIGS. 2 and 3, the elastic member 33 has a plurality of recesses 34 extending in the center direction of the ring in the annular portion. As shown, it does not have to reach the radially outer edge of the annular portion of the elastic member 33. Thereby, the housing 31 is in a floating state with respect to the flange 32, and the vibration absorbing effect of the elastic member 33 is enhanced, so that the drive motor 3 can be further reduced in noise.

  Although the embodiment of the invention has been described by taking an outer rotor type motor in which the rotor assembly rotates on the outer periphery of the stator assembly as an example, it should be understood that the rotor assembly is disposed on the inner periphery side of the stator assembly. It is also possible to apply to a rotating inner rotor type motor.

DESCRIPTION OF SYMBOLS 1 Blower unit 2 Blower case 3 Drive motor 4 Multiblade fan 11 Rotating shaft 21 Rotor assembly 22 Stator assembly 23 Bearing 24 Bearing 25 Armature winding 27 Magnet 28 Control board 30 Motor main body 31 Housing 31a Housing main body 31b Boss part 32 Flange 33 Elastic member 34 Concave portion 35 Insertion portion 36 Engagement hole 40 Air passage 41 Through-hole

Claims (3)

A rotating shaft for rotating a rotating member such as a fan attached to one end of a direction along the longitudinal direction, a rotor assembly attached to the rotating shaft and capable of rotating together with the rotating shaft; A stator assembly that is opposed to the rotor assembly in a direction along the radial direction of the rotating shaft and is arranged so as not to rotate with the rotating shaft; The control board provided at a position close to the one end side in the direction, and the rotation shaft at a position on one end side of the control board in the direction along the longitudinal direction of the rotation axis And a housing formed to extend outward along a radial direction of the control board, enclose the control board, the rotor assembly, and the stator assembly. Forming a body part,
The housing is made of metal and attached to a case in which an air passage is defined inside such that the outer surface of the air passage is exposed, and the stator assembly enclosed in the housing is mounted. A drive motor fixed to the inner surface of the housing. The motor main body is adapted to be attached to the case via a flange provided on an end surface opposite to the control board side of the housing along the axial direction of the rotating shaft. The drive motor according to claim 1, wherein an elastic member is interposed between the housing and the flange.   The drive motor according to claim 2, wherein a portion of the elastic member facing the base end side of the housing has a plurality of strip-shaped irregularities.

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