JP2009123359A - Drive circuit device, and motor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive circuit device capable of suppressing variation of weld strength, and to provide a motor device equipped with the same. <P>SOLUTION: A connecting terminal 22 extended from a circuit board 36 is bent at a connecting terminal bending portion 22A, and extended upward together with a lead terminal 18 extended from a control IC 44. The end part of the connecting terminal 22 and the end part of the lead terminal 18 are bonded at a welding point 16 by electric welding. Since the connecting terminal 22 is bent to part from the lead terminal 18 at a bent point 22B, a current can be prevented from branching at a portion other than the welding point 16 during electric welding, to suppress variation of weld strength. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drive circuit device that controls a drive unit, and a motor device including the drive circuit device.

  Patent Document 1 discloses a technique for electrically connecting a plate-like lead member extended from a circuit device to another plate-like terminal by projection welding.

Specifically, by approximating the electrical conductivity of the lead member and the terminal, variation in heat generation temperature at the connection portion (welded portion) of the lead member and terminal is suppressed, and variation in welding strength is suppressed.
JP-A-3-57179

  However, if an unintended contact between the lead member and the terminal occurs in the vicinity of the connection portion between the lead member and the terminal, it is conceivable that the current is diverted, the heat generation temperature is lowered, and the welding strength varies.

  In view of the above facts, it is an object of the present invention to suppress variations in welding strength.

  A drive circuit device according to claim 1 of the present invention includes a circuit member capable of supplying a current to the drive unit, a plate-like connecting terminal extending from the circuit member, an element mounted on the circuit member, A plate-like lead terminal extending from the element and having an end connected to the end of the connection terminal at a welding point by electric welding; and on the element side from the welding point, the connection terminal and the At least one of the lead terminals is bent, and the connection terminal and the lead terminal are separated from each other.

  According to the above configuration, the plate-like connecting terminal extended from the circuit board that can supply current to the drive unit and the plate-like lead terminal extended from the element mounted on the circuit board are welded by electric welding. Connected with dots.

  Here, on the element side from the welding point, at least one of the connection terminal and the lead terminal is bent, and the connection terminal and the lead terminal are separated from each other. Thereby, it can suppress that an electric current flows and shunts other than a welding point at the time of electric welding, and can suppress the dispersion | variation in welding strength.

  According to a second aspect of the present invention, in the drive circuit device according to the first aspect, the element has a flat flat surface, the circuit member has a flat surface, and the flat surface and the flat surface overlap. Thus, the element is mounted on the circuit member.

  According to the above configuration, since the element is mounted on the circuit member so that the flat surface of the element and the flat surface of the circuit member overlap, the drive circuit device can be made compact.

  A drive circuit device according to a third aspect of the present invention is the drive circuit device according to the first or second aspect, wherein the connection terminal and the lead terminal are extended and bent from the circuit member and the element, and the connection terminal bent portion and A leaf terminal bent portion is formed and extends along an electronic component mounted on the circuit member.

  According to the above configuration, the connection terminal and the lead terminal are extended from the circuit member and the element and bent to form the connection terminal bent portion and the REIT terminal bent portion, and along the electronic component mounted on the circuit member. It is provided to extend. For this reason, it is suppressed that a connection terminal and a lead terminal protrude from a circuit member and an element, and a drive circuit device can be made compact.

  A drive circuit device according to a fourth aspect of the present invention is the drive circuit device according to the third aspect, wherein at least one of the welding point and the connecting terminal bent portion and the weld point and the lead terminal bent portion is At least one of the connecting terminal and the lead terminal is bent, and the connecting terminal and the lead terminal are separated from each other.

  According to the above configuration, the connection terminal and the lead terminal are bent by bending at least one of the connection terminal and the lead terminal between at least the weld point and the connection terminal bent part and between the weld point and the lead terminal bent part. By making it separate, a welding point can be provided in the position away from the connection terminal bending part and the lead terminal bending part with respect to the circuit member and the element. For this reason, a circuit member and an element can be protected from the heat etc. which generate | occur | produce at the time of welding.

  A drive circuit device according to a fifth aspect of the present invention is the drive circuit device according to any one of the first to fourth aspects, wherein the connection terminal and the lead when viewed from a welding direction in which the connection terminal and the lead terminal are welded. The outer peripheral shape around the welding point of the terminal is overlapped.

  According to the above configuration, when the connection terminal and the lead terminal are viewed from the welding direction, the outer peripheral shapes around the welding point of the connection terminal and the lead terminal overlap, so the plate width of the connection terminal and the lead terminal is used as the welding surface. It can be used effectively, and the drive circuit device can be made compact.

  A motor device according to a sixth aspect of the present invention includes the drive circuit device according to any one of the first to fifth aspects, and a motor main body as a drive unit.

  According to the said structure, the motor main body as a drive part is controlled by the drive circuit apparatus of any one of Claims 1-5, and is rotationally driven. Since the drive circuit device according to any one of claims 1 to 5 is used and conduction failure due to variation in welding strength is suppressed, the motor body can be rotationally driven in a stable state.

  A motor device 12 employing a drive circuit device 10 as an example according to a first embodiment of the present invention will be described with reference to FIGS.

(overall structure)
First, the configuration of the motor device 12 will be described.

  As shown in FIG. 8, the motor holder 70 of the motor device 12 used in the blower motor for vehicle air conditioning includes a substantially cylindrical accommodating portion 70 </ b> A whose upper portion (upper side in FIG. 8) is closed, and the accommodating portion 70 </ b> A. And a disc-shaped flange portion 70B formed on the outer periphery. The motor main body 72 is accommodated in the accommodating portion 70A.

  The motor main body 72 is a DC motor, and has a cylindrical yoke case 74 whose upper portion is closed, a magnet 76 fixed to the inner peripheral surface of the yoke case 74, and a magnet 76 that is rotatably accommodated inside the magnet 76. And an armature 78. Such a motor main body 72 is fixed to the motor holder 70 by tightening the lid portion constituting the ceiling of the yoke case 74 and the lid portion of the accommodating portion 70A by a fixing member (not shown). .

  Further, a cover 80 that covers the lower portion of the armature 78 described above is attached to the lower opening of the yoke case 74. An opening 82 is provided between the lower opening of the yoke case 74 and the cover 80 so that the inside and outside of the motor main body 72 can communicate with each other.

  The armature 78 includes a rotation shaft 84, a core 86 fixed to the rotation shaft 84, a winding 88 wound around the core 86, and a rectification fixed to the rotation shaft 84 on the lower side of the core 86. And a child 90.

  Further, the upper end portion of the rotating shaft 84 is rotatably supported by a bearing 92 provided at the center of the lid portion of the yoke case 74. Further, the lower end portion side of the rotating shaft 84 is rotatably supported by a bearing 94 provided on the cover 80, and the lower end portion protrudes downward from the cover 80 to the outside. A fan or the like (not shown) is fixed to the lower end portion of the rotating shaft 84 protruding from the cover 80 so as to be integrally rotatable. Further, a brush holder (not shown) is provided inside the cover 80, and the brush accommodated in the brush holder is in sliding contact with the commutator 90.

  In addition, a communication hole 94 is formed in the lid portion of the yoke case 74 to communicate the inside and outside of the motor main body 72. The communication hole 94 communicates with a communication passage 96 formed in the lid portion of the housing portion 70 </ b> A of the motor holder 70.

  On the other hand, on the upper surface 70C of the flange portion 70B of the motor holder 70, a case portion 96 that accommodates the drive circuit device 10 that controls the drive of the motor main body 72 is formed.

  As shown in FIGS. 4 and 5, drive current is supplied to the drive circuit device 10 from a vehicle-mounted battery via a metal terminal 42 </ b> A of the connector portion 42 described later.

  Furthermore, the drive circuit device 10 includes a circuit board 36 on which capacitors 30 and 32 and a choke coil 34 and the like that cause power supply noise are mounted and whose lower surface is formed by a flat flat surface 36A (see FIG. 3). ing.

  The circuit board 36 is molded with the molding resin 14 to ensure an insulation state. Further, the mold resin 14 is electrically connected to the mounting hole 40A and the mounting seat surface 40 for mounting the circuit board 36 to the case portion 96 (see FIGS. 6 and 7) with a fixing member such as a screw, or to a driving power source. A connector portion 42 is formed.

  The connector portion 42 is provided with a plurality (three in the present embodiment) of metal terminals 42A that are electrically connected to the circuit board 36, and these metal terminals 42A are extended from the drive power supply. A current is supplied to the drive circuit device 10 in contact with the terminal of a connector provided at the tip of the supply wire.

  In addition, the circuit board 36 is provided with a bus bar 24 that is formed of a plate-like conductive metal (for example, a metal plate such as copper, phosphor bronze, or the like) and flows current to a predetermined position. The portion protrudes from the mold resin 14 as the connection terminal 22 and extends. The details of the connecting terminal 22 will be described later.

  Further, as shown in FIG. 5, below the circuit board 36 (below shown in FIG. 5), an external operation signal is received and the drive power supplied to the motor body 72 (see FIG. 8) is adjusted. A control IC 44 for adjusting the rotation speed of the motor main body 72 to a speed corresponding to the operation signal is provided. The control IC 44 has a flat plate shape with a flat surface 44A that is flat on the upper side. When the control IC 44 is mounted on the circuit board 36, the flat surface 44A and the flat surface 36A of the circuit board 36 overlap each other. ing.

  Further, a plate-like REIT terminal 18 that electrically connects the control IC 44 and the connecting terminal 22 described above extends from the side surface of the control IC 44. Details of the lead terminal 18 will be described later.

  Further, below the control IC 44, a sheet-shaped heat radiation sheet 46 and a heat sink 48 for radiating heat generated in the circuit board 36 and the control IC 44 to the atmosphere are provided. The heat sink 48 is formed from a metal material having high heat dissipation such as aluminum, and has a plate-shaped heat dissipation plate 48B and a cylindrical connection cylindrical portion 48A (2 in the present embodiment) that is erected on the upper surface of the heat dissipation plate 48B. Provided). The connecting cylindrical portion 48A is fitted into the through hole 26 of the circuit board 36 provided at a position corresponding to the connecting cylindrical portion 48A, and the heat sink 48 is fixed to the circuit board 36.

  Further, a plurality of columnar heat radiating fins 48C are provided on the lower surface of the heat radiating plate 48B (the surface opposite to the circuit board 36). The heat radiating fins 48C increase the surface area to heat the atmosphere. Easy to release.

  In addition, the heat dissipation sheet 46 sandwiched between the heat sink 48 and the control IC 44 has an insulating property to insulate the control IC 44 and the heat sink 48, and also effectively transfers heat generated from the control IC 44 to the heat sink 48 to provide a heat dissipation effect. In order to increase, it is formed in a rectangular shape with a synthetic resin material having good thermal conductivity.

(Main part configuration)
Next, the connection terminal 22 extending from the circuit board 36 and the lead terminal 18 extending from the control IC 44 will be described.

  As shown in FIGS. 1, 2, and 5, a plurality (five in the present embodiment) of lead terminals 18 extend from the side surface of the control IC 44, and are bent upward at the REIT terminal bent portion 18 </ b> A. The circuit board 36 is provided so as to extend along the capacitors 30 and 32 mounted on the circuit board 36.

  Furthermore, a spherical convex portion 18B (see FIG. 2A) that is convex toward the circuit board 36 is formed in the vicinity of the tip portion of the lead terminal 18.

  On the other hand, a plurality (five in this embodiment) of connection terminals 22 extend from the side of the mold resin 14 that molds the circuit board 36 and is bent upward at the connection terminal bent portion 22A. It extends along the mounted capacitor 30 and choke coil 34 so as to face the lead terminal 18.

  Also, as shown in FIG. 2A, the vicinity of the tip of the connection terminal 22 before being connected to the lead terminal 18 at the welding point 16 (see FIG. 2B) by projection welding (electric welding) is The plate surface of the connecting terminal 22 and the plate surface of the lead terminal 18 are arranged in parallel, and the projection 18B of the lead terminal 18 contacts the plate surface of the connecting terminal 22 facing the lead terminal 18. .

  Further, as shown in FIG. 2C, the outer peripheral shape around the welding point 16 of the connecting terminal 22 and the lead terminal 18 when viewed from the direction (welding direction) orthogonal to the plate surface of the lead terminal 18. The outer peripheral shapes of the connecting terminal 22 and the lead terminal 18 are determined so that they overlap.

  Here, a bending point 22 </ b> B where the connection terminal 22 is bent away from the lead terminal 18 is provided on the control IC 44 side of the welding point 16 in the connection terminal 22. Thereby, the connection terminal 22 and the lead terminal 18 are close to each other only in the vicinity of the welding point 16.

(Action / Effect)
Next, a welding procedure for performing projection welding of the connecting terminal 22 and the lead terminal 18 at the welding point 16 will be described.

  As shown in FIG. 2A, the vicinity of the distal end portions of the connection terminal 22 and the lead terminal 18 before welding hits a convex portion 18 </ b> B formed on the lead terminal 18. In this state, the welding electrode 52 is disposed so as to contact the back surface of the connecting terminal 22 (the surface not facing the lead terminal 18), and further, contact the back surface of the lead terminal 18 (the surface not facing the connecting terminal 22). The welding electrode 54 is disposed on the surface.

  As shown in FIG. 2C, a detail 54 </ b> A that is thinner than the plate width of the lead terminal 18 is provided at the lower end of the welding electrode 54, and the convex portion 18 </ b> B is provided between the detail 54 </ b> A and the welding electrode 52. Is arranged.

  Next, as shown in FIG. 2B, a current is passed from the welding electrode 54 to the welding electrode 52 through the convex portion 18 </ b> B of the lead terminal 18 and the connection terminal 22. In this way, by concentrating current on the convex portion 18B, the vicinity of the convex portion 18B is heated (resistive heat), and the convex portion 18B is softened.

  Further, the welding electrode 54 is moved to the welding electrode 52 side (arrow A side), the softened convex portion 18B is pressed against the connection terminal 22, and the connection terminal 22 and the lead terminal 18 are connected at the welding point 16.

  Here, as described above, since the connecting terminal 22 is bent away from the lead terminal 18 at the bending point 22B, it is possible to suppress a current from flowing other than the welding point 16 to be shunted during projection welding. And variation in welding strength can be suppressed.

  Moreover, since the connection terminal 22 and the REIT terminal 18 can be welded in a stable state by suppressing the variation in welding strength, poor conduction between the connection terminal 22 and the REIT terminal 18 can be suppressed.

  Further, since the connecting terminal 22 is bent away from the lead terminal 18 at the bending point 22B, even if the positional accuracy of the connecting terminal 22 or the lead terminal 18 is low, it is possible to suppress the diversion.

  Further, the connection terminal 22 and the lead terminal 18 are extended from the circuit board 36 and the control IC 44 and bent at the connection terminal bent part 22A and the REIT terminal bent part 18A, and the capacitor 30 and the choke mounted on the circuit board 36 are connected. It is provided so as to extend along the coil 34. For this reason, it is suppressed that the connection terminal 22 and the lead terminal 18 protrude from the circuit board 36 and the control IC 44, and the drive circuit device 10 can be made compact.

  Further, the connection terminal bent portion is bent with respect to the circuit board 36 and the control IC 44 by bending the connection terminal 22 between the welding point 16 and the connection terminal bent portion 22 </ b> A and separating the connection terminal 22 and the lead terminal 18. The welding point 16 can be provided at a position away from 22A and the lead terminal bent portion 18A. For this reason, the circuit board 36 and the control IC 44 can be protected from heat generated during welding.

  Further, since the control IC 44 is mounted on the circuit board 36 so that the flat surface 44A of the control IC 44 overlaps the flat surface 36A of the circuit board 36, the drive circuit device 10 can be made compact.

  Further, since the outer peripheral shapes of the connecting terminal 22 and the lead terminal 18 are determined so that the outer peripheral shapes of the connecting terminal 22 and the lead terminal 18 overlap when the connecting terminal 22 and the lead terminal 18 are viewed from the welding direction. The plate widths of the terminals 22 and the lead terminals 18 can be used effectively as welding surfaces, and the drive circuit device 10 can be made compact.

  Further, since the rotation shaft 84 of the motor device 12 is controlled and rotated by the drive circuit device 10 in which poor conduction is suppressed, the rotation shaft 84 can be rotated in a stable state.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above embodiment, the connecting terminal 22 is bent and separated from the lead terminal 18, but the connecting terminal and the lead terminal may be separated by bending the lead terminal or bending the connecting terminal and the lead terminal.

  Moreover, although the said embodiment demonstrated the projection welding as an example of electric welding, spot welding etc. may be sufficient.

  Next, a motor device 102 employing the drive circuit device 100 according to the second embodiment will be described with reference to FIG.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. As shown in FIG. 9, in the second embodiment, unlike the first embodiment, the connecting terminal 104 is bent at a curved point 104A at a right angle away from the lead terminal 18, and further at a curved point 104B. It is configured to be bent at a right angle downward.

  Thus, the connection terminal 104 can be easily separated from the lead terminal 18 by bending the connection terminal 104 between two stages.

It is the expanded sectional view which showed the motor apparatus which concerns on 1st Embodiment of this invention, and showed the connection terminal vicinity of the drive circuit device. (A) (B) (C) It is the side view and front view which showed the connection terminal vicinity of the drive circuit apparatus employ | adopted as the motor apparatus which concerns on 1st Embodiment of this invention. It is the side view which showed the whole drive circuit apparatus employ | adopted as the motor apparatus which concerns on 1st Embodiment of this invention. It is the top view which looked at the whole drive circuit device employ | adopted as the motor apparatus which concerns on 1st Embodiment of this invention from the top. It is the disassembled perspective view which showed the drive circuit apparatus employ | adopted as the motor apparatus which concerns on 1st Embodiment of this invention. It is the top view which looked at the motor apparatus concerning a 1st embodiment of the present invention from the top. It is sectional drawing which showed the upper part of the motor apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which showed the whole motor apparatus which concerns on 1st Embodiment of this invention. (A) (B) It is the side view and front view which showed the connection terminal vicinity of the drive circuit apparatus employ | adopted as the motor apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Drive circuit apparatus, 12 ... Motor apparatus, 16 ... Welding point, 18 ... Reed terminal, 18A ... Reed terminal bending part, 22 ... Connection terminal, 22A ... Connection terminal bent portion, 30 ... capacitor (electronic component), 32 ... capacitor (electronic component), 34 ... choke coil (electronic component), 36 ... circuit board (circuit member), 36A ..Flat surface, 44 ... Control IC (element), 44A ... Flat surface, 72 ... Motor body (drive unit), 84 ... Rotation shaft (motor rotation shaft), 100 ... Drive Circuit device 102 ... Motor device 104 ... Connecting terminal

Claims (6)

A circuit member capable of supplying a current to the drive unit;
A plate-like connecting terminal extending from the circuit member;
An element mounted on the circuit member;
A plate-like lead terminal extending from the element and having an end connected to the end of the connection terminal at a welding point by electric welding;
With
At least one of the connection terminal and the lead terminal is bent on the element side from the welding point, and the connection terminal and the lead terminal are separated from each other.   2. The element according to claim 1, wherein the element has a flat flat surface, the circuit member has a flat surface, and the element is mounted on the circuit member so that the flat surface and the flat surface overlap each other. The drive circuit device described.   The connection terminal and the lead terminal are extended from the circuit member and the element and bent to form a connection terminal bent portion and a REIT terminal bent portion, and extend along an electronic component mounted on the circuit member. The drive circuit device according to claim 1, wherein the drive circuit device is provided.   At least one of the connection terminal and the lead terminal is bent between at least one of the welding point and the connection terminal bent portion and between the weld point and the lead terminal bent portion, and the connection terminal and the lead terminal. The drive circuit device according to claim 3, wherein the drive circuit devices are separated from each other.   5. The outer peripheral shape around the welding point of the connection terminal and the lead terminal overlaps when viewed from the welding direction in which the connection terminal and the lead terminal are welded. The drive circuit device according to item. The drive circuit device according to any one of claims 1 to 5,
A motor body as a drive unit;
A motor device comprising:

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