JP2012060832A - Heat radiation structure of load drive control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a load drive control apparatus on an area other than a flange part and cool the load drive control apparatus.SOLUTION: A load drive control apparatus 4, driving an electric motor 3, is placed on an inner peripheral surface 11c of a housing body 11 of the electric motor 3. Heat generated from the load drive control apparatus 4 is radiated from a housing 10. Thus, the housing 10 functions as a radiator having a large heat radiating area.

Description

  The present invention relates to a heat dissipation structure for a load drive control device.

  Conventionally, in an electric blower, a blower motor, a blower fan supported on the tip end side of the rotation shaft of the blower motor, a flange portion provided on the outer peripheral side of the blower motor housing, and a load drive that outputs a drive voltage for driving the blower motor Some have a control device (for example, Patent Document 1).

JP 2006-254673 A

  In the thing of the said patent document 1, by mounting a load drive control apparatus in a flange part, load drive control apparatus is arrange | positioned in the axial direction of a ventilation fan, and load drive control is carried out by the wind blown directly from a ventilation fan. The apparatus is configured to cool. For this reason, when the blower motor is downsized and the flange portion is reduced, the load drive control device cannot be mounted on the flange portion.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a heat dissipation structure for a load drive control device in which the load drive control device is mounted in addition to the flange portion and the load drive control device can be cooled.

In order to achieve the above object, the invention described in claim 1 is a heat dissipation structure that dissipates heat generated from a load drive control device that drives an electric motor,
The electric motor is configured by housing a rotor in a housing,
The load drive control device is fixed inside the housing, and the housing constitutes a radiator that dissipates heat generated from the load drive control device.

  According to the present invention, since the load drive control device is fixed inside the housing, the housing functions as a radiator having a large heat radiation area, and the housing can dissipate much heat from the load drive control device. . Therefore, it is possible to provide a heat dissipation structure for a load drive control device that can cool the load drive control device without mounting the load drive control device on the flange portion.

  According to a second aspect of the present invention, in the heat dissipation structure of the load drive control device according to the first aspect, the electric motor is radially outward by the air sucked from the axial direction of the rotating shaft as the rotor rotates. The rotor is configured to generate a rotor wind, and the load drive control device is cooled by the rotor wind.

  According to this invention, since the load drive control device is cooled by the rotor wind, the heat from the load drive control device can be efficiently radiated.

  According to a third aspect of the present invention, in the heat dissipation structure of the load drive control device according to the first or second aspect, the first and second permanent magnets constituting the stator of the electric motor are formed on the inner peripheral surface of the housing. It is arrange | positioned and the said load drive control apparatus is being fixed to the internal peripheral surface of the said housing between the said 1st, 2nd permanent magnet.

  According to the present invention, it is possible to arrange the load drive control device using a space that is free in the housing. For this reason, the enlargement of the physique of the electric motor including the load drive control device can be suppressed.

  According to a fourth aspect of the present invention, in the heat dissipation structure for the load drive control device according to any one of the first to third aspects, in the housing, outside the portion where the load drive control device is fixed inside. A cooling fin is provided.

  According to this invention, more heat from the load drive control device can be dissipated by the cooling fins provided in the housing.

It is a figure showing the section composition of the electric blower in one embodiment of the present invention. It is AA sectional drawing in FIG. It is an external view of the electric blower of FIG. It is a figure which shows the single-piece | unit of the load drive control apparatus of FIG. It is a figure which shows the cross-sectional structure of the electric blower in the 1st modification of one Embodiment of this invention. It is a figure which shows the cross-sectional structure of the electric blower in the 2nd modification of one Embodiment of this invention. It is A arrow directional view of FIG.

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

  1, 2, and 3 show an embodiment of an electric blower 1 to which a heat dissipation structure for a drive device according to the present invention is applied. FIG. 1 is a partial cross-sectional view of the electric blower 1, and FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is an external view of the electric blower 1.

The electric blower 1 constitutes an in-vehicle air conditioner, and includes a sirocco fan 2, an electric motor 3, and a load drive control device (drive device) 4 as shown in FIG. The sirocco fan 2 is supported on the tip end side of the rotating shaft 3a of the electric motor 3 by the boss portion 2a. The sirocco fan 2 is a centrifugal blower that blows air sucked from one axial side (the upper side in the drawing) of the rotating shaft 3a to the radially outer side of the rotating shaft 3a.
The electric motor 3 constitutes a DC motor, and includes a housing 10, a rotor 20, and a stator 30 as shown in FIGS. 1 and 2.

  As shown in FIG. 1, the housing 10 is a motor housing including a housing main body 11 and a lid portion 12. The housing body 11 is formed in a cylindrical shape. The housing body 11 has an opening on one side in the axial direction (upper side in the drawing) and a bottom 11a on the other side in the axial direction (lower side in the drawing).

  As shown in FIG. 2, the inner peripheral surface 11c of the housing body 11 is provided with a recess 13 that is recessed radially outward (left side in the figure). The bottom surface 13a of the recess 13 is formed in a flat shape and constitutes a contact surface that contacts the load drive control device 4 as will be described later.

  Cooling fins 14 constituting the concavo-convex portions are provided on the outer side in the radial direction with respect to the bottom surface 13 a of the outer peripheral surface 11 d of the housing body 11. As shown in FIGS. 2 and 3, the cooling fin 14 includes a plurality of concave portions 14 a and a plurality of convex portions 14 b.

  The recess 14a is formed so as to be recessed toward the bottom surface 13a side (the back side perpendicular to the paper surface in FIG. 3) over the axial direction (vertical direction in FIG. 3) of the rotating shaft 3a of the electric motor 3. The convex portion 14b is formed so as to protrude on the opposite side to the bottom surface 13a (the front side in the direction perpendicular to the paper surface in FIG. 3) across the axial direction of the rotating shaft 3a of the electric motor 3. The plurality of concave portions 14a and the plurality of convex portions 14b are arranged alternately. The cooling fin 14 in the present embodiment includes eight convex portions 14b and seven concave portions 14a.

  As shown in FIG. 2, mounting portions 11 e and 11 f are provided on the outer peripheral surface 11 d of the housing body 11. The attachment portions 11e and 11f are plate members and are formed so as to protrude radially outward from the outer peripheral surface 11d of the housing body 11 respectively. A hole 11g is formed in each of the attachment portions 11e and 11f. The attachment portions 11e and 11f constitute an air conditioner unit attachment portion for supporting the electric motor 3 on a casing (not shown) of the in-vehicle air conditioner.

  The lid portion 12 in FIG. 1 is provided so as to cover an opening portion on one axial side (the upper side in FIG. 1) of the housing body 11. The lid 12 is provided with a hole 12a for allowing the rotary shaft 3a to pass therethrough.

  As shown in FIG. 1, the rotary shaft 3 a is disposed in the housing 10, and the axial direction of the rotary shaft 3 a coincides with the axial direction of the housing body 11. The rotary shaft 3 a has a distal end side on one side in the axial direction that protrudes outside the housing 10 through the hole 12 a of the lid portion 12. The rotating shaft 3a is rotatably supported by bearings 4a and 4b. The bearing 4a is disposed on one axial side (illustrated upper side) of the rotating shaft 3a, and the bearing 4b is disposed on the other axial side (lower illustrated) of the rotating shaft 3a. The bearing 4 a is fitted in the hole 12 a of the lid 12 and supported by the lid 12, and the bearing 4 b is supported by the housing body 11.

  As shown in FIG. 2, the rotor 20 includes a rotor core 21. The rotor core 21 is composed of a cylindrical portion 23 and a plurality of convex portions 24 as shown by a broken portion indicated by an arrow B in FIG. A broken portion indicated by an arrow B indicates a state in which a part of the coil 26 wound around the rotor core 21 is broken as will be described later. The rotating shaft 3a is fitted in the hollow portion (not shown) of the cylindrical portion 23. The plurality of convex portions 24 are formed so as to protrude radially outward from the cylindrical portion 23 over the axial direction of the cylindrical portion 23 (the direction perpendicular to the paper surface in FIG. 2). The plurality of convex portions 24 are each formed in a T shape. The plurality of convex portions 24 are arranged in the circumferential direction of the cylindrical portion 23. Thereby, the recessed part 25 is formed in the adjacent two convex part 24 among the some convex parts 24. FIG. The rotor core 21 of the present embodiment has 13 convex portions 24 and 12 concave portions 25. A coil 26 is wound around the cylindrical portion 23 of the rotor core 21 so as to pass through each recess 25. As will be described later, the coil 26 generates a rotating magnetic field, and its end is connected to a commutator (not shown).

  The stator 30 is composed of permanent magnets 30a and 30b. As shown in FIG. 2, the permanent magnets 30 a and 30 b are formed in an arc shape, and are disposed on the inner peripheral surface 11 c of the housing body 11. The permanent magnets 30 a and 30 b are arranged so as to face each other via the rotor 20.

  The load drive control device 4 includes a MOSFET, a control circuit, and the like, and is a drive for driving the electric motor 3 in accordance with a command from an electronic control device (not shown) based on an output voltage of a power supply device (not shown). Output voltage. In addition, the load drive control device 4 is provided with a smoothing circuit for stabilizing the output voltage of the power supply device.

  On the inner peripheral surface 11c of the housing body 11, the load drive control device 4 is located on one side in the circumferential direction with respect to the permanent magnet 30a (counterclockwise direction in FIG. 2) and on the other side in the circumferential direction with respect to the permanent magnet 30b. It is located on the side (clockwise direction in FIG. 2).

  As shown in FIG. 4, the load drive control device 4 of the present embodiment is a mold type IC composed of an IC body 40 and leads 41 to 45 formed in a rectangular plate shape. As shown in FIG. 2, the IC body 40 is disposed in the recess 13 of the housing body 11. The IC body 40 is arranged with its surface 42b facing the rotor 20 side. The IC main body 40 has a back surface 42 a disposed toward the bottom surface 13 a of the recess 13 of the housing main body 11. The back surface 42a of the IC body 40 is fixed to the bottom surface 13a of the recess 13 of the housing body 11 by bonding with an adhesive.

  The leads 41, 42, and 43 are formed so as to protrude from the IC body 40 to one axial side of the rotating shaft 3a (the lower side in FIG. 1). As shown in FIG. 1, the lead 41 is formed in an L shape and is connected to a corresponding L-shaped terminal 52 a in the connector 52. Like the lead 41, the leads 42 and 43 are formed in an L shape and are connected to corresponding L-shaped terminals (not shown) in the connector 52.

  The lead 41 constitutes a battery terminal, and is connected to the plus electrode of the power supply device via the connector 52 and the electric wire 53. The lead 43 constitutes a ground terminal, and is connected to the negative electrode of the power supply device via the connector 52 and the electric wire 53. The lead 42 constitutes an input signal terminal, and is connected to the electronic control device via the connector 52 and the electric wire 53. The connector 52 is fitted in the hole of the bottom 11 a of the housing body 11.

  4 are connected to a brush (not shown) via two relay terminals (only one relay terminal 46 is shown in FIG. 1). The two relay terminals are each formed in an L shape and supported by the housing 10. The brush is supported by the housing 10 and applies a drive voltage output from the load drive control device 4 to the commutator in contact with a commutator (commutator) 50 (see FIG. 1).

  Next, the operation of this embodiment will be described.

  First, the load drive control device 4 outputs a drive voltage based on the output voltage of the power supply device. When this drive voltage is applied to the commutator via the brush, a current flows through the coil 26 of the rotor 20. At this time, a rotational force based on the magnetic field generated by the stator and the current is generated in the coil 26. Along with this, the rotor 20 rotates the rotary shaft 3a. For this reason, the rotating shaft 3 a rotates the sirocco fan 2.

  Here, heat is generated when the load drive control device 4 outputs a drive voltage. This heat is transferred from the back surface 42 of the IC body 40 to the housing 10 through the bottom surface 13 a of the recess 13. For this reason, the heat from the IC body 40 is radiated from the housing 10. In particular, a large amount of heat is radiated from the cooling fins 14 located radially outside the load drive control device 4 in the housing main body 11 of the housing 10.

  In addition to this, when the rotor 20 rotates, with the rotation of the plurality of convex portions 24, the air is sucked in from the axial direction of the rotating shaft 3a to generate an air flow radially outward. This air flow is blown to the IC body 40 of the load drive control device 4 as rotor wind.

  According to the present embodiment described above, the load drive control device 4 that drives the electric motor 3 is disposed on the inner peripheral surface 11 c of the housing body 11 of the electric motor 3. Since the heat generated from the load drive control device 4 is radiated from the housing 10, the housing 10 functions as a radiator having a large heat radiation area. That is, the cooling effect can be enhanced by directly mounting the load drive control device 4 on the housing 10. For this reason, it becomes possible to cool the load drive control device 4 corresponding to the electric motor 3 with the flange portion reduced in this embodiment.

  Cooling fins 14 including a plurality of convex portions and a plurality of concave portions are provided on the outer side in the radial direction with respect to the load drive control device 4 in the housing body 11 of the electric motor 3 of the present embodiment. For this reason, the performance (namely, heat dissipation) which radiates the heat from the load drive control device 4 can be improved. Therefore, the load drive control device 4 can be efficiently cooled.

In the present embodiment, when the rotor 20 of the electric motor 3 rotates, the rotor wind can be blown to the IC body 40 of the load drive control device 4 as the plurality of convex portions 24 rotate. That is, by mounting the load drive control device 4 inside the housing body 11, the load drive control device 4 can be cooled by the wind from the rotor 20.
Therefore, the load drive control device 4 can be cooled more efficiently.

  The load drive control device 4 according to the present embodiment has a circumferential direction with respect to the permanent magnet 30a on the inner circumferential surface 11c of the housing body 11 of the housing 10 of the electric motor 3 and with respect to the permanent magnet 30b. Located on the other side of the direction. Therefore, the load drive control device 4 can be arranged in the housing 10 using the vacant space. For this reason, the enlargement of the physique can be suppressed as the electric blower 1 including the load drive control device 4.

  In the present embodiment, the example in which the cooling fins 14 are provided in the housing main body 11 of the housing 10 has been described, but instead of this, the cooling fins 14 may be as shown in FIG. In FIG. 5, the cooling fin 14 and the recess 13 are formed, and the support member 14 </ b> A that supports the load drive control device 4 by the recess 13 is provided separately from the housing body 11, and the support member 14 </ b> A is provided in the housing body 11. 110 is arranged so as to cover 110.

  In the present embodiment, the recess 13 is provided on the inner peripheral surface 11c of the housing body 11, and the load drive control device 4 is supported by the recess 13, but instead, as shown in FIGS. Alternatively, the load drive control device 4 may be arranged. FIG. 6 is a front view showing the inside of the housing main body 11 of the electric blower 1. FIG. 7 is a bottom view showing the inside of the housing main body 11 from the bottom 11a side, as seen from the direction of arrow A in FIG.

  The load drive control device 4 is disposed on the inner surface 11 h of the bottom 11 a of the housing body 11. The IC main body 40 of the load drive control device 4 shown in FIGS. 6 and 7 is formed in a fan shape (see FIG. 7) when viewed from the axial direction of the rotating shaft 3a. Relay terminals 44a and 45a are connected to the leads 44 and 45, respectively. The relay terminals 44a and 45a are formed so as to extend in the axial direction of the rotating shaft 3a. The leading ends of the relay terminals 44a and 45a are located in the vicinity of the commutator 50, and are connected to the commutator 50 via brushes (not shown).

  In the present embodiment, an example in which a DC motor is used as the electric motor 3 has been shown, but an AC motor may be used as the electric motor 3 instead. In this case, the load drive control device 4 constitutes an inverter circuit that outputs an alternating current to the alternating current motor based on the output voltage of the power supply device.

  In this embodiment, although the example which applied the heat dissipation structure of the load drive control apparatus which concerns on this invention to the electric blower 1 was shown, the load drive control apparatus 4 is arrange | positioned on the inner wall of the housing 10 of the electric motor 3, and the housing 10 is arranged. As long as it functions as a radiator of the load drive control device 4, the heat dissipation structure of the load drive control device according to the present invention may be applied to any device.

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Sirocco fan 3 Electric motor 3a Rotating shaft 4 Load drive control apparatus 10 Housing 11 Housing main body 12 Cover part 14 Cooling fin 14a, 14b Convex part 20 Rotor 21 Rotor core 22 Hollow part 23 Cylindrical part 24 Convex part 26 Coil 30 Stator

Claims (4)

A heat dissipation structure that dissipates heat generated from a load drive control device that drives an electric motor,
The electric motor is configured by housing a rotor in a housing,
A heat dissipation structure for a load drive control device, wherein the load drive control device is fixed inside the housing, and the housing constitutes a heat radiator that dissipates heat generated from the load drive control device.   The electric motor is configured to generate rotor wind radially outward by the air sucked from the axial direction of the rotating shaft as the rotor rotates, and the load drive control device is cooled by the rotor wind. The heat dissipation structure for a load drive control device according to claim 1, wherein the heat dissipation structure is configured as described above.   First and second permanent magnets constituting a stator of the electric motor are arranged on an inner peripheral surface of the housing, and the load drive control device is configured such that the load driving control device includes the housing between the first and second permanent magnets. The heat dissipating structure of the load drive control device according to claim 1, wherein the heat dissipating structure is fixed to an inner peripheral surface of the load drive control device.   4. The load drive control device according to claim 1, wherein a cooling fin is provided outside the portion of the housing where the load drive control device is fixed inside. 5. Heat dissipation structure.

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