JP2017158249A - Blower motor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a mounting area of a substrate and reduce a thickness, compared to a case where two substrates are installed overlapped with each other, in a blower motor unit.SOLUTION: A blower motor unit 1 includes a motor 4, an electronic substrate 5 which drives the motor, and a casing 2 which houses the electronic substrate 5. The motor 4 is a brushless motor. The electronic substrate 5 is arranged inclining in a direction arranged along a shaft core of an output shaft 42 of the brushless motor 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blower motor unit.

  For example, Patent Document 1 discloses a blower unit for a vehicle. The blower unit includes a brushed motor, a base substrate on which a drive circuit for driving the brushed motor is mounted, and a control board on which a control circuit for controlling the brushed motor is mounted. These base substrate and control substrate are formed in a substantially fan shape avoiding the motor with brush, and the substrate surface is arranged so as to be orthogonal to the axis of the output shaft, as viewed from the direction along the coaxial core. They are placed one on top of the other.

JP 2005-6413 A

  By the way, the blower motor control unit disclosed in Patent Document 1 has a brushed motor mounted on the blower motor control unit that rotationally drives the blower fan. The dimension is large. On the other hand, in recent years, an attempt has been made to reduce the thickness of the blower motor control unit by suppressing the height dimension of the blower motor control unit by mounting a brushless motor instead of the brushed motor.

  However, in the configuration disclosed in Patent Document 1, the base substrate on which the drive circuit is mounted and the control substrate on which the control circuit is mounted are arranged so as to overlap each other when viewed from the direction along the axis of the output shaft of the brushed motor. Has been. However, when a brushless motor is mounted on the blower unit disclosed in Patent Document 1, an additional circuit configuration for performing so-called electronic rectification on the brushless motor is also required. For this reason, only one of the two substrates of Patent Document 1 is sufficient to form both a control circuit and a drive circuit including an additional circuit configuration that performs electronic rectification on the brushless motor. The mounting area cannot be secured. Therefore, it is necessary to secure a space in which the two substrates are stacked inside the casing even when a brushless motor is mounted instead of the brushed motor, and the blower motor unit cannot be made sufficiently thin.

  The present invention has been made in view of the above-described problems. In the blower motor unit in which the brushless motor is mounted, the mounting area of the substrate is ensured and the thickness is reduced as compared with the case where two substrates are stacked. Objective.

  In order to achieve the above object, in the present invention, as a first means, a blower motor unit comprising a motor, an electronic board for driving the motor, and a casing for housing the electronic board, wherein the motor is It is a brushless motor, and the electronic board adopts a configuration in which the electronic board is disposed to be inclined with respect to a direction along the axis of the output shaft of the brushless motor.

  As a second means, in the first means, the electronic substrate is disposed with the substrate surface facing the tip side of the output shaft and the back surface of the substrate facing the base side of the output shaft, and one end side is the above-mentioned A circuit board that is positioned on the base side of the output shaft and is inclined so as to be positioned on the tip side of the output shaft as the other end side is separated from the output shaft; and a plurality of circuit boards that are mounted on the circuit board and have different sizes Among the plurality of electronic components, an electronic component having a relatively large protruding amount from the circuit board is mounted on the back side of the circuit board toward the other end side. It adopts the configuration of being.

  As a third means, a configuration is adopted in which the second means includes a base frame that is housed in the casing and holds the stator of the brushless motor and the circuit board.

  As a fourth means, in the third means, a configuration is adopted in which the base frame has an opening through which the winding of the brushless motor is inserted.

  As a fifth means, in the fourth means, the electronic board has a connection terminal standing from the circuit board and facing the opening, and an end of the winding is directly connected to the connection terminal. Is adopted.

  As a sixth means, in any one of the second to fifth means, a heat dissipating member connected to the electronic substrate and exhausting heat of the electronic substrate is further provided, and the heat dissipating member is disposed on the surface of the substrate. A configuration is adopted in which it is erected in a direction that is inclined with respect to it.

  As a seventh means, in the sixth means, a configuration is adopted in which the heat radiating member is in contact with the electronic component.

  As an eighth means, in the sixth means, the electronic substrate is in contact with the first thermal pad in contact with the electronic component on the back surface of the substrate and the heat dissipation member on the surface of the substrate. The second thermal pad is used, and the first thermal pad and the second thermal pad are connected to each other through a thermal hole provided so as to penetrate the circuit board.

  As a ninth means, in the first to eighth means, the casing is configured to introduce an introduction opening for introducing gas outside the casing into the inside, and discharge the gas introduced from the introduction opening to the outside. The electronic substrate is arranged in the stream line of the gas flowing from the introduction opening to the central opening.

  According to the present invention, the electronic board is disposed so as to be inclined with respect to a direction along the axis of the output shaft of the brushless motor (hereinafter referred to as the axis direction). For this reason, the blower motor unit can be made thinner as compared with the case where two electronic substrates are arranged so as to overlap each other in the axial direction of the output shaft. Furthermore, the mounting area can be increased without increasing the size in the radial direction of the output shaft, as compared with the case where the electronic substrate is disposed perpendicular to the axis of the output shaft. Therefore, according to the present invention, in the blower motor unit, it is possible to secure the mounting area of the substrate and to make it thinner than when two substrates are stacked.

It is sectional drawing containing the blower motor unit which concerns on one Embodiment of this invention. It is a front view of the circuit board in one embodiment of the present invention. It is a cross-sectional enlarged view containing the thermal radiation member and circuit board in one Embodiment of this invention. It is a cross-sectional enlarged view which shows the modification of arrangement | positioning of the electronic component and heat radiating member in one Embodiment of this invention.

Hereinafter, an embodiment of a blower motor unit according to the present invention will be described with reference to the drawings.
The blower A is disposed in a part of a duct constituting the vehicle air conditioner. The duct is provided with a scroll-shaped fan provided with a mounting portion to which the blower motor unit 1 is mounted, an air inlet opening at the top of the mounting portion, and an air delivery port directed downstream (leftward in FIG. 1). Cases are connected. The blower motor unit 1 includes a motor 4 mounted on a mounting portion via a bracket (not shown), and an impeller B fixed to the output shaft 42 of the motor 4 and rotatably disposed in a fan case. The impeller B is a centrifugal fan having a large number of blades on the outer periphery thereof, and is rotated by the blower motor unit 1 through the output shaft 42 to suck in air from the air inlet and blow it through the air outlet. .
In the following description, the side where the impeller B is attached to the blower motor unit 1 is described as the upper side.

  As shown in FIG. 1, the casing 2 is formed by fixing an upper casing portion 2 </ b> A and a lower casing portion 2 </ b> B, and includes a casing portion 20 and a gas guide portion 21. The casing part 20 is a flat, substantially cylindrical container-like part, and the electronic substrate 5, the motor 4, and the heat dissipation member 6 are accommodated therein. The casing portion 20 has a substantially circular upper surface portion 20a, a peripheral surface portion 20b, and a substantially circular bottom surface portion 20c. The casing part 20 has the center opening part 20d and the heat radiating member exposure opening part 20e.

  The central opening 20d is an opening formed in the central portion of the upper surface portion 20a, and accommodates a rotor 41 (described later) of the motor 4 and exposes the rotor 41. The heat radiating member exposed opening 20 e is an opening formed at a position corresponding to the heat radiating member 6, and is provided to project the upper part of the heat radiating member 6 to the outside of the casing 2. Moreover, the casing part 20 has an opening in which the gas guide part 21 is connected to the peripheral surface part 20b.

  As shown in FIG. 1, the gas guide portion 21 is a pipe-like portion bent upward, and one end thereof is connected to an opening formed in the peripheral surface portion 20 b of the casing portion 20. Moreover, the gas guide part 21 has the introduction opening part 21a in the other end. The introduction opening 21a is formed toward the upper side where the impeller B is disposed. The introduction opening 21 a is an opening for taking outside air into the casing 2. Such a gas guide part 21 takes in a part of the flow of the gas generated by the impeller B and allows the outside air to flow into the casing part 20.

  Note that the casing 2 having such a shape is formed by combining the upper casing portion 2A and the lower casing portion 2B which are divided into two vertically on the peripheral surface portion 20b. The upper casing portion 2A is an upper member including the upper surface portion 20a, and the lower casing portion 2B is a lower member including the bottom surface portion 20c.

  As shown in FIG. 1, the base frame 3 is a member provided inside the casing 2 and supports the motor 4, the electronic substrate 5, and the heat dissipation member 6. The motor 4 and the heat radiating member 6 are attached to the surface of the base frame 3 on the upper casing portion 2A side (hereinafter referred to as the frame surface), and the electronic substrate 5 is mounted on the surface of the base frame 3 on the lower casing portion 2B side ( Hereinafter, it is attached to the rear surface of the frame. Such a base frame 3 includes a motor holding portion 31, a heat radiating member fixing portion 32, an opening portion 33, a lower bearing holding portion 34 and an inclined portion 35.

  The motor holding part 31 is a part to which a stator 40 of the motor 4 described later is fixed. The heat radiating member fixing portion 32 is a part where an opening through which the heat radiating member 6 is inserted is formed and the heat radiating member 6 is fixed. The opening 33 is a hole that communicates the front surface of the frame and the rear surface of the frame that are disposed across the motor holding portion 31 and the inclined portion 35, and the winding 40a of the motor 4 described later is inserted therethrough. The opening 33 does not hinder the flow of air flowing between the lower casing portion 2B and the base frame 3 from moving toward the central opening 20d. The lower bearing holding portion 34 is a recess in which a lower bearing 43b that supports an output shaft 42 of the motor 4 to be described later is disposed. The lower bearing holding portion 34 is a frame rear surface of the motor holding portion 31 and the output shaft 42 is inserted therethrough. Formed in position. The inclined portion 35 is a portion that is formed so as to be directed toward the introduction opening 21 a side of the casing 2 from the base position of the output shaft 42, and is inclined with respect to the direction along the axis of the output shaft 42. In the inclined portion 35, the electronic substrate 5 is fixed to the back surface side of the frame, and the heat dissipation member 6 is fixed to the front surface side of the frame.

  The motor 4 is a three-phase AC brushless motor fixed to the base frame 3. As shown in FIG. 1, the motor 4 includes a stator 40, a rotor 41, an output shaft 42, and a rotation support portion 43. The stator 40 is disposed on the motor holding portion 31 of the base frame 3. The stator 40 is a member that has a winding 40a and forms a magnetic field. The stator 40 has a gas flow path formed at a position overlapping the ventilation hole of the base frame 3. The winding 40a is a wound thin metal wire, and its surface is covered with an insulating material. The winding 40 a is inserted through the opening 33 and connected to the electronic substrate 5.

  The rotor 41 is a member (outer rotor) that is rotatably provided outside the stator 40. The rotor 41 is rotated by being pulled by a magnetic field formed by the stator 40. The rotor 41 has a ventilation opening (not shown) at a position corresponding to the gas flow path. The output shaft 42 is inserted through the stator and press-fitted and fixed to the rotor 41, and is connected to the impeller B as shown in FIG. The output shaft 42 transmits the rotational power generated by the motor 4 to the impeller B. The rotation support portion 43 is a cylindrical member in which an upper bearing 43a that pivotally supports the distal end side of the output shaft 42 is disposed on the inner side. The rotation support portion 43 is press-fitted into the stator 40 and is located above the lower bearing holding portion 34 (on the frame surface side). ) Is attached to the motor holding portion 31 coaxially with the lower bearing holding portion 34. Further, a lower bearing 43 b is disposed in the lower bearing holding portion 34. Thereby, the output shaft 42 is rotatably supported by the base frame 3.

  FIG. 2 is a front view of the electronic substrate 5 in the present embodiment. The electronic board 5 includes a drive circuit including electronic components 5B having different sizes such as a plurality of capacitors and switching elements for supplying a PWM-controlled drive current to the motor 4, and a programmable control element (not shown). (CPU). The electronic board 5 includes a control circuit that is connected to the switching element and supplies a control signal to the switching element, and a circuit board 5A that has wiring of these circuits. In FIG. 2, only some of the electronic components are shown, and other electronic components are not shown.

  The circuit board 5A has a substantially semicircular shape in which the output shaft 42 side is a chord and the peripheral surface portion 20b side is an arc. The circuit board 5A is arranged so as to be inclined in a direction in which an end portion (one end side) forming a string is on the lower side and an end portion (other end side) forming an arc is on the upper side. That is, as shown in FIG. 1, the circuit board 5 </ b> A is arranged so that one end side thereof is directed toward the base side of the output shaft 42, and the other end side is positioned on the distal end side of the output shaft 42 as it is separated from the output shaft 42. It arrange | positions toward the introduction opening part 21a side. Furthermore, the circuit board 5 </ b> A is arranged eccentrically with respect to the output shaft 42 of the motor 4 inside the casing 2. Thus, a triangular space K is formed in the casing 2 by being surrounded by the lower casing portion 2B and the circuit board 5A and having the circuit board 5A as an oblique side in a side view. Thereby, the electronic board | substrate 5 is arrange | positioned in the streamline of the gas which flows from the introduction opening part 21a to the center opening part 20d. Further, the circuit board 5A has a notch 50 corresponding to the opening 33 of the base frame 3 in the vicinity of the base side of the output shaft 42, and the lower surface of the circuit board 5A (hereinafter referred to as the back surface of the substrate). And a connection terminal 51 arranged so as to protrude from the notch 50. The end of the winding 40a of the motor 4 is directly connected to the connection terminal 51 by electrodeposition. Note that the notch 50 does not hinder the flow of air flowing between the lower casing portion 2B and the base frame 3 from moving toward the central opening 20d, similarly to the opening 33 described above. The control circuit is a sensorless control system that does not require a rotation detection sensor. Thus, the electronic board 5 does not need to include a rotation angle detector for detecting the rotation angle state of the output shaft 42 in the vicinity of the output shaft 42, and therefore the notch 50 is provided in the vicinity of the root side of the output shaft 42. It can be easily formed.

  In the electronic component 5B mounted on the circuit board 5A, the capacitor or the like has a large protruding amount from the circuit board 5A, so that it is on the back surface of the electronic board 5 and in the vicinity of the end portion forming the arc of the electronic board 5. Arranged close together. That is, the capacitors and the like are arranged in a triangular space K with the circuit board 5 </ b> A as an oblique side inside the casing 2.

  FIG. 3 is an enlarged cross-sectional view including the heat dissipation member 6 and the electronic substrate 5. A switching element or the like (hereinafter referred to as a heat generating electronic component 5B1) of the electronic substrate 5 becomes a heat generation source when the blower motor unit 1 according to the present embodiment is driven. The circuit board 5A has a thermal hole 52 and a thermal pad 53 at a position where the heat generating electronic component 5B1 is disposed.

  The thermal pad 53 faces the aforementioned triangular space K, and includes a first thermal pad 53a on which the heat generating electronic component 5B1 is mounted and a second thermal pad 53b that is thermally connected to the heat dissipation member 6. Have. The thermal hole 52 is a member that is provided so as to penetrate the circuit board 5A and thermally connects the first thermal pad 53a and the second thermal pad 53b. For example, the thermal hole 52 has a low thermal resistance such as solder or copper material (via). The heat conduction is facilitated by being densely filled with the members.

  The heat radiating member 6 is disposed above the triangular space K, and is fixed to the frame surface side of the base frame 3 via a fixing portion (not shown). As for this heat radiating member 6, the upper end part 60 is exposed to the exterior from the heat radiating member exposure opening part 20e provided in the upper surface part 20a of the casing part 20. As shown in FIG. Further, the heat dissipating member 6 is provided with a lower end portion 60 a formed on an inclined surface along the substrate surface of the circuit board 5 </ b> A arranged to be inclined inside the casing 2. Such a lower end portion 60a is inserted into the heat radiating member fixing portion 32, and is thermally connected to the second thermal pad 53b of the circuit board 5A on the back surface side of the frame. Thereby, the heat radiating member 6 can discharge the heat of the heat generating electronic component 5 </ b> B <b> 1 to the outside of the casing 2. Note that an auxiliary heat transfer member such as a heat conductive sheet or thermal grease may be attached to the lower end portion 60a. In this case, the heat radiating member 6 and the second thermal pad 53b are brought into close contact with each other by the auxiliary heat transfer member, and heat transfer is improved.

  FIG. 4 is an enlarged cross-sectional view showing a modified example of the arrangement of the electronic component 5B and the heat dissipation member 6 according to the present invention. As shown in this figure, a heat generating electronic component 5B1 having a particularly large heat generation amount may be disposed on the surface side of the circuit board 5A, and the heat generating electronic component 5B1 and the heat dissipating member 6 may be in contact with each other. In this case, the thermal hole 52 and the thermal pad 53 are not provided, and an auxiliary heat transfer member such as a heat conductive sheet is interposed between the heat dissipation member 6 and the heat generating electronic component 5B1. With the configuration shown in FIG. 4, there is a margin in the mountable area where the electronic component 5B can be mounted on the back side of the substrate. Therefore, the remaining electronic component 5B (for example, a capacitor having a large protruding amount from the circuit board 5A) can be easily disposed on the back side of the board.

  In the blower A provided with such a blower motor unit 1, when the motor 4 starts to be driven under energization control by the electronic substrate 5, the output shaft 42 is rotated along with the rotor 41, and the impeller B is rotated. The When the impeller B is rotated, an airflow is generated around the impeller B. As shown in FIG. 1, a part of this gas flows into the blower motor unit 1 from the introduction opening 21a. The gas flowing in from the introduction opening 21a passes through the gas guide 21 and flows into the space K formed by the electronic substrate 5 and the lower casing portion 2B. At this time, the heat generating electronic component 5B1 is disposed in a space K formed by the electronic substrate 5 and the lower casing portion 2B. Therefore, the electronic component 5B comes into contact with a large amount of gas and is efficiently cooled.

  Further, the gas that has flowed into the space K formed by the electronic substrate 5 and the lower casing portion 2 </ b> B passes through the opening 33 of the base frame 3 from the cutout portion 50 of the electronic substrate 5 and flows into the motor 4. . The gas flowing into the motor 4 passes through the gas flow path and is discharged to the outside of the casing 2 through the central opening 20d. Since the gas discharged to the outside flows along the upper surface portion 20 a of the casing 2, it contacts the upper end portion 60 of the heat radiating member 6. Here, the heat generated from the heat generating electronic component 5B1 is conducted to the thermal hole 52 by the first thermal pad 53a. Further, the heat conducted to the thermal hole 52 is conducted from the second thermal pad 53b to the heat radiating member 6. The heat radiating member 6 is cooled by the gas in contact with the heat radiating member 6.

  According to the blower motor unit 1 of this embodiment, the motor 4 is a brushless motor. Since this brushless motor does not have a brush in the motor, it can be reduced in size as compared with a motor with a brush. Furthermore, the electronic substrate 5 is disposed to be inclined with respect to the direction along the axis of the output shaft 42. Thereby, the blower motor unit 1 can be reduced in size.

  Further, according to the blower motor unit 1 of the present embodiment, the electronic board 5 is brushless so that one end side is positioned on the base side of the output shaft 42 and the other end side is positioned on the distal end side of the output shaft 42 as the distance from the output shaft 42 increases. The circuit board 5A is disposed to be inclined with respect to the direction along the axis of the output shaft of the motor. Further, the electronic board 5 includes a plurality of electronic components 5B that are mounted on the circuit board 5A and have different sizes. Among the plurality of electronic components 5B, the electronic component 5B having a relatively large protruding amount from the board is brought close to the other end side of the circuit board 5A and arranged in the vicinity of the peripheral surface portion 20b of the casing 2. Thereby, the electronic component 5B having a large protruding amount from the circuit board 5A, such as a capacitor, is disposed in a triangular space K formed by the electronic board 5 and the lower casing portion 2B. Therefore, the blower motor unit 1 can arrange the electronic component 5B on the circuit board 5A without waste, and the blower motor unit 1 can also be reduced in size.

  The blower motor unit 1 of the present embodiment includes a base frame 3 that holds the stator 40 of the motor 4 and the circuit board 5A. Thereby, the electronic substrate 5 can be freely arranged inside the casing 2. Furthermore, the base frame 3 includes an opening 33 through which the end of the winding 40a of the motor 4 is inserted. Therefore, the stator 40 of the motor 4 held by the base frame 3 and the circuit board 5A can be easily connected. Also by this, the electronic board | substrate 5 can be freely arrange | positioned inside the casing 2. FIG.

  Further, according to the blower motor unit 1 of the present embodiment, the winding 40 a of the motor 4 is directly connected to the connection terminal of the electronic board 5. That is, the stator 40 that vibrates in different vibration modes due to the difference in material and shape and the electronic substrate 5 are directly connected by the flexible winding 40a. Thereby, it is not necessary to provide an anti-vibration member or the like that absorbs the difference in vibration mode between the stator 40 and the electronic substrate 5. Therefore, the number of parts of the blower motor unit 1 can be reduced, and the blower motor unit 1 can be downsized.

  Further, according to the blower motor unit 1 of the present embodiment, the heat radiating member 6 is thermally connected to the electronic substrate 5 and has the lower end portion 60 a formed obliquely along the electronic substrate 5. Thereby, the heat radiating member 6 with the upper end portion 60 exposed to the outside from the heat radiating member exposed opening 20e provided on the upper surface portion 20a of the casing portion 20 is easy with respect to the electronic substrate 5 arranged to be inclined. Thermally connected to. Therefore, the heat generated from the electronic substrate 5 can be efficiently discharged outside the casing 2.

Further, according to the blower motor unit 1 of the present embodiment, the heat generating electronic component 5B1 having a particularly large heat generation amount is disposed on the surface side of the circuit board 5A so that the heat generating electronic component 5B1 and the heat dissipation member 6 are in contact with each other. Also good. Thereby, a capacitor or the like having a large protruding amount from the circuit board 5A can be easily arranged on the back side of the board.

Further, according to the blower motor unit 1 of the present embodiment, the electronic substrate 5 is in contact with the first thermal pad 53a connected to the electronic component on the back surface side of the substrate and the heat dissipation member 6 on the substrate surface side. 2 thermal pads 53b, and these thermal pads 53 are connected to each other through a thermal hole 52 provided so as to penetrate the circuit board 5A. Thereby, the heat generated in the heat generating electronic component 5 </ b> B <b> 1 can be conducted to the heat radiating member 6. Therefore, also by this, the heat of the electronic substrate 5 can be efficiently discharged.

  In addition, the blower motor unit 1 of the present embodiment has an introduction opening 21a and a central opening 20d, and the electronic substrate 5 is disposed in a streamline of gas flowing from the introduction opening 21a to the central opening 20d. ing. Thereby, the electronic substrate 5 can always be in contact with gas while the motor 4 is driven. Therefore, also by this, the heat of the electronic substrate 5 can be efficiently discharged.

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the thermal holes 52 are arranged in a single column shape connecting the first thermal pad 53a and the second thermal pad 53b. However, the present invention is not limited to this. . A plurality of thermal holes 52 may be provided.

(2) In the above embodiment, the electronic substrate 5 is fixed to the inclined portion 35 of the base frame 3, but the present invention is not limited to this. The electronic substrate 5 is inclined by fixing one end to the base frame 3 and fixing the other end to the peripheral surface portion 20b of the casing 2 above the fixing position in the base frame 3 in the axial direction. It may be arranged.

DESCRIPTION OF SYMBOLS 1 ... Blower motor unit, 2 ... Casing, 3 ... Base frame, 33 ... Opening part, 35 ... Inclination part, 4 ... Motor, 42 ... Output shaft, 5 ... Electronic board, 5A ... Circuit board, 5B ... Electronic component, 50 ... Notch part, 51 ... Connection terminal, 52 ... Thermal hole, 53 ... Thermal pad, 6 ... Heat dissipation member

Claims (9)

A blower motor unit comprising a motor, an electronic board that drives the motor, and a casing that houses the electronic board,
The motor is a brushless motor;
The blower motor unit, wherein the electronic board is disposed to be inclined with respect to a direction along the axis of the output shaft of the brushless motor. The electronic substrate is
The substrate surface is arranged with the front side of the output shaft and the back side of the substrate facing the base side of the output shaft, and one end side is located on the base side of the output shaft and the other end side is separated from the output shaft. A circuit board that is inclined so as to be positioned on the tip side of the output shaft;
A plurality of electronic components mounted on the circuit board and having different sizes;
Among the plurality of electronic components, an electronic component having a relatively large protruding amount from the circuit board is mounted on the back surface side of the circuit board and close to the other end side. The blower motor unit according to claim 1.   3. The blower motor unit according to claim 2, further comprising a base frame that is accommodated in the casing and holds a stator of the brushless motor and the circuit board.   The blower motor unit according to claim 3, wherein the base frame has an opening through which a winding of the brushless motor is inserted. The electronic board has a connection terminal standing from the circuit board and facing the opening,
The blower motor unit according to claim 4, wherein an end of the winding is directly connected to the connection terminal. A heat dissipating member connected to the electronic substrate and discharging heat of the electronic substrate;
The blower motor unit according to any one of claims 2 to 5, wherein the heat radiating member is erected in a direction inclined with respect to the substrate surface.   The blower motor unit according to claim 6, wherein the heat radiating member is in contact with the electronic component. The electronic substrate is
A first thermal pad in contact with the electronic component on the back surface of the substrate, and a second thermal pad in contact with the heat dissipation member on the surface of the substrate;
The blower motor unit according to claim 6, wherein the first thermal pad and the second thermal pad are connected to each other so as to be capable of transferring heat by a thermal hole provided so as to penetrate the circuit board. The casing is
An introduction opening for introducing gas outside the casing into the interior;
A central opening for discharging the gas introduced from the introduction opening to the outside,
The blower motor unit according to any one of claims 1 to 8, wherein the electronic board is disposed in a streamline of the gas flowing from the introduction opening to the central opening.

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