JP2005216622A - Welding structure of electric component and welding method of electric component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding structure of an electric component and a welding method of an electric component capable of easily positioning a metal plate resistor to metal plate wiring without separately needing a tool for positioning it, and of electrically and mechanically connecting them to each other. <P>SOLUTION: Engagement projection parts 51 and 52 are projected on a load side common wiring pattern 29 and a ground wiring pattern 31, respectively. Engagement recessed parts 53 and 54 engaging with the projection parts 51 and 52 by inserting the projection parts 51 and 52 therein are formed on a current detecting resistor 30, respectively. By inserting and engaging the projection parts 51 and 52 into/with the recessed parts 53 and 54, the resistor 30 is positioned perpendicularly to the wiring pattern 29 and the wiring pattern 31. Welding is applied by bringing a welding electrode trunk part into contact from both axial sides of the engaged projection parts 51 and 52 and the recessed parts 53 and 54, and the resistor 30 is electrically and mechanically connected to the wiring pattern 29 and the wiring pattern 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a welding structure for electric parts and a method for welding electric parts.

  Conventionally, as a method of welding a tab terminal to a metal plate wiring, there is a method disclosed in Patent Document 1. In the welding method for metal plate wiring (bus bar in the literature) disclosed in Patent Document 1, positioning holes having the same diameter are respectively formed in the metal plate wiring and the tab terminal. The distal end portion of the positioning pressing pin used for positioning the metal plate wiring and the tab terminal is a small diameter distal end portion having the same diameter as the positioning hole formed in the metal plate wiring and the tab terminal. Further, in the positioning pressing pin, the proximal end of the small diameter distal end portion is a large diameter step portion having a diameter larger than that of the small diameter distal end portion. Then, insert the small-diameter tip of the positioning retainer pin into the positioning hole of the metal plate wiring and the positioning hole of the tab terminal, and position the tab terminal against the metal plate wiring by the large-diameter stepped portion. Laser welding is performed to fix the tab terminal to the metal plate wiring.

  Conventionally, a controller for driving a motor has a wiring portion through which a large current flows in a metal plate wiring in order to increase the efficiency of the motor and reduce heat generation, and further includes a driving transistor, a coil, a current detection resistor, and the like. The circuit element is connected to the metal plate wiring by welding. Among the circuit elements, the plate-like current detection resistors are arranged so as to bridge between the metal plate wirings, and are fixed to the metal plate wirings by spot welding at both ends.

  However, since the welded portions of the metal plate wiring and the current detection resistor are both planar, it is difficult to accurately arrange the current detection resistor at a desired position with respect to the metal plate wiring. For this reason, the current detection resistor is not arranged at the correct position with respect to the metal plate wiring, that is, it is welded without being shifted from the correct position, and the position of the current detection signal terminal provided in the current detection resistor is shifted and the electric power is moved. Assembling the fan controller to the circuit board may become impossible.

Therefore, it is conceivable to use the welding method disclosed in Patent Document 1 when welding the current detection resistor to the metal plate wiring.
Japanese Patent Laid-Open No. 11-297445

  However, when the current detection resistor is welded to the metal plate wiring using the welding method disclosed in Patent Document 1, positioning is performed unless the two positioning holes respectively formed in the metal plate wiring and the current detection resistor are aligned. The pressing pin cannot be inserted into the positioning hole. At this time, it is not an easy task to align the positioning hole formed in the metal plate wiring with the positioning hole formed in the current detection resistor. Further, in order to position the metal plate wiring and the current detection resistor, a positioning pressing pin must be prepared separately.

  The present invention has been made in view of such circumstances, and the purpose of the present invention is to easily perform positioning of the metal plate resistance with respect to the metal plate wiring without requiring a separate positioning tool. It is an object of the present invention to provide a welding structure for electrical parts that can be electrically and mechanically connected, and a method for welding electrical parts.

  In order to solve the above problems, the invention according to claim 1 is directed to a welding structure of an electrical component in which a metal plate wiring and a metal plate resistance are electrically and mechanically connected by welding, and the metal plate wiring and the metal plate resistance. Are formed with concave and convex positioning portions for positioning by engaging with each other.

According to a second aspect of the present invention, in the welding structure for electric parts according to the first aspect, the positioning portion is welded to connect the metal plate wiring and the metal plate resistance.
According to a third aspect of the present invention, in the welding structure for an electric component according to the first or second aspect, the metal plate resistance and the metal plate wiring are electric components that constitute a motor control circuit.

  According to a fourth aspect of the present invention, there is provided a welding method of an electrical component in which a metal plate wiring and a metal plate resistance are electrically and mechanically connected by welding, and the metal plate wiring and the metal plate resistance are engaged with each other. An uneven positioning portion for positioning is formed, and the positioning is engaged with each other by positioning the metal plate resistance with respect to the metal plate wiring.

According to a fifth aspect of the present invention, in the welding structure for electric parts according to the fourth aspect, the positioning portion is welded to connect the metal plate wiring and the metal plate resistance.
According to a sixth aspect of the present invention, in the electric component welding method according to the fourth or fifth aspect, the metal plate wiring and the metal plate resistance are electric components constituting a motor control circuit.

(Function)
According to the first and fourth aspects of the present invention, since the metal plate wiring and the metal plate resistor are formed with the concave and convex positioning portions for positioning by engaging with each other, the positioning portions are engaged. By doing so, the metal plate resistance is positioned with respect to the metal plate wiring. The positioning part has a simple concave and convex configuration, and by simply engaging the concave and convex positioning part, positioning of the metal plate resistance with respect to the metal plate wiring can be easily performed without the need for a separate positioning tool. be able to.

  According to the second and fifth aspects of the present invention, in the positioning portion where the metal plate wiring and the metal plate resistance are engaged, since the adhesion between the metal plate wiring and the metal plate resistance is high, the formation of the weld nugget is formed. Becomes easy. Accordingly, the bonding strength between the metal plate wiring and the metal plate resistance can be improved.

  According to the third and sixth aspects of the present invention, the metal plate wiring and the metal plate resistor constituting the motor control circuit are formed with concave and convex positioning portions for positioning by engaging with each other. Therefore, the metal plate resistance is positioned with respect to the metal plate wiring by engaging the positioning portion. The positioning part has a simple concave and convex configuration, and by simply engaging the concave and convex positioning part, positioning of the metal plate resistance with respect to the metal plate wiring can be easily performed without the need for a separate positioning tool. be able to.

  According to the present invention, it is possible to easily perform positioning of the metal plate resistance with respect to the metal plate wiring without the need for a separate positioning tool, and an electric component welding structure that can be electrically and mechanically connected to each other. , And a method for welding electrical parts.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, an electric fan controller 1 as a control circuit is for controlling a brushless motor 3 as a motor to perform a blowing operation based on a command from a host controller 2. The electric fan controller 1 is provided inside the brushless motor 3.

  The brushless motor 3 includes three coils 4 to 6, a sensor magnet 7, and a Hall IC 8. The sensor magnet 7 and the Hall IC 8 detect the rotation angle of a rotor (not shown) of the brushless motor 3. That is, the rotation angle of the rotor is detected by detecting the magnetic flux of the sensor magnet 7 by the Hall IC 8, and the driving of the brushless motor 3 is controlled based on the rotation angle detection signal.

  One end of the host controller 2 is connected to the vehicle-mounted battery 13 via the fuse 11 and the ignition switch 12, and the other end is grounded (connected to the ground GND). The host controller 2 is an engine ECU of the automobile, and performs control for adjusting the amount of cooling air that passes through the radiator according to the temperature of cooling water of the engine as one control. Specifically, the host controller 2 outputs a command value signal to the electric fan controller 1, and the electric fan controller 1 adjusts the output of the brushless motor 3, that is, the rotation speed, based on the command value signal.

  The electric fan controller 1 includes six n-channel MOS FETs (hereinafter simply referred to as FETs) 21 to 26, a choke coil 27, a current detection resistor 30 as a metal plate resistor, diodes 32 to 37, and an FET drive circuit. 38, a logical operation circuit 39, a temperature detection element 40, a step-down circuit 42, a resistor 41, and two capacitors 43 and 44.

  In the six FETs 21 to 26, FETs 21 and 22, FETs 23 and 24, and FETs 25 and 26 connected in series two by two are connected in parallel. The drains of the FETs 21, 23, 25 are connected to the battery 13 via the choke coil 27 and the fuse 28, and the sources of the FETs 22, 24, 26 are connected to the low-side common wiring 29, the current detection resistor 30, and the ground wiring 31. Is grounded. Between the sources and drains of the FETs 21 to 26, diodes 32 to 37 for protecting the FETs 21 to 26 are connected. One end of the coil 4 of the brushless motor 3 is connected between the source of the FET 21 and the drain of the FET 22, and one end of the coil 5 is connected between the source of the FET 23 and the drain of the FET 24, and the source of the FET 25 and the FET 26 are connected. One end of the coil 6 is connected to the drain. The other ends of the coils 4 to 6 are connected to each other. The gates of the FETs 21 to 26 are connected to the FET drive circuit 38. The FET drive circuit 38 controls the rotational speed of the brushless motor 3 by controlling the FETs 21 to 26 on and off according to the logic signal output from the logic operation circuit 39. The current detection resistor 30 includes current detection signal terminals 30 a at both ends, and is connected to a logical operation circuit 39. The current detection resistor 30 is provided for detecting a current flowing in the circuit.

  One end of the temperature detecting element 40 is connected to the choke coil 27 via a resistor 41, and the other end is grounded. The temperature detection element 40 detects the ambient temperature in the vicinity of the electric fan controller 1, changes its resistance value according to the detected ambient temperature, and outputs a voltage divided by the resistor 41 to the logic operation circuit 39.

  The logic operation circuit 39 is supplied with power through the fuse 28, the choke coil 27, and the step-down circuit 42 by reducing the voltage of the battery 13 to 5 V, which is the operation voltage of the logic operation circuit 39. The logical operation circuit 39 has two main functions. One of them detects the rotation angle of the rotor based on the rotation angle detection signal output from the Hall IC 8, and the coil 4 according to the detected rotation angle. This is a function of outputting a logic signal for supplying drive current to .about.6. The other is to monitor the voltage, current, ambient temperature, etc. of the electric fan controller 1, and limit or stop the supply of drive current to the brushless motor 3 when an abnormality such as overcurrent, overvoltage, or overheating occurs. This function protects the electric fan controller 1.

  One end of the choke coil 27 is grounded via a capacitor 43, and the other end is grounded via a capacitor 44. These capacitors 43 and 44 and the choke coil 27 are provided in order to reduce the noise of the power supplied to the electric fan controller 1.

  In the electric fan controller 1 described above, in order to increase the efficiency of the brushless motor 3 and reduce heat generation, the wiring portion through which a large current flows is formed of a metal plate on the circuit board. Furthermore, circuit elements such as the FETs 21 to 26, the choke coil 27, and the current detection resistor 30 are connected to the wiring portion by welding.

  FIG. 2 shows the wiring in the current detection resistor 30 which is one of the electrical components. Both the low-side common wiring 29 and the ground wiring 31 which are one of the electrical components are formed in a strip shape from a metal plate, and are arranged in parallel with a certain interval. Further, columnar engaging convex portions 51 and 52 that respectively constitute positioning portions are provided in the same direction at the center in the width direction of the low-side common wiring 29 and the ground wiring 31. The engagement convex portion 51 of the low-side common wiring 29 and the engagement convex portion 52 of the ground wiring 31 are the center of the engagement convex portion 51 and the engagement convex portion as viewed from the axial direction of the engagement convex portions 51, 52. A straight line passing through the center of the portion 52 is arranged so as to be orthogonal to the low-side common wiring 29 and the ground wiring 31. The diameter of the engaging projections 51 and 52 is about half of the width of the low-side common wiring 29 and the ground wiring 31. And since the engagement convex parts 51 and 52 are formed by embossing, the back side is a cylindrical recessed part which has an opening part. Moreover, the outer diameter of the engagement convex parts 51 and 52 is formed smaller than the outer diameter of the welding electrode trunk part X (refer FIG. 3).

  The current detection resistor 30 has a rectangular plate shape, the length in the longitudinal direction is slightly longer than the width between the wires including the low-side common wire 29 and the ground wire 31, and the length in the short direction is the low side. It is formed to be slightly longer than the width of the side common wiring 29 (or the ground wiring 31). Two current detection signal terminals 30 a for connection to the logic operation circuit 39 are fixed at substantially the center of the current detection resistor 30. Further, the engaging convex portions 51 and 52 are fitted and inserted near both ends in the longitudinal direction of the current detection resistor 30 to engage with the engaging convex portions 51 and 52 to form a positioning portion. Engaging recesses 53 and 54 are formed, respectively. Further, the engagement recesses 53 and 54 are located at the approximate center in the short direction of the current detection resistor 30. The inner diameters of the engagement recesses 53 and 54 are substantially equal to the outer diameter of the engagement protrusions 51 and 52, and the depths of the engagement recesses 53 and 54 are substantially equal to the heights of the engagement protrusions 51 and 52. By forming the outer diameters and depths of the engagement recesses 53 and 54 in this way, the low-side common wiring 29 and the ground wiring when the engagement recesses 53 and 54 and the engagement projections 51 and 52 are engaged with each other. The degree of adhesion between 31 and the current detection resistor 30 is increased. The bottom surfaces 53a of the engaging concave portions 53 and 54 (only the bottom surface of the engaging concave portion 53 is shown in FIG. 3) are the upper surfaces 51a of the engaging convex portions 51 and 52 when engaged with the engaging convex portions 51 and 52. , 52a.

  The current detection resistor 30 as described above is arranged so as to bridge the low-side common wiring 29 and the ground wiring 31, and the engaging convex portion 51 formed in the low-side common wiring 29 is used as the engaging concave portion 53. The engaging protrusions 52 formed on the ground wiring 31 are inserted into the engaging recesses 54 and engaged with each other. As a result, the current detection resistor 30 is positioned at right angles to the low-side common wiring 29 and the ground wiring 31. At this time, the upper surfaces 51a and 52a of the engaging convex portions 51 and 52 and the bottom surfaces 53a of the engaging concave portions 53 and 54 are in contact with each other. Then, the welding electrode trunk portion X is brought into contact with both sides of the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54 in the axial direction, and is pressed and heated, whereby the engaging convex portions 51 and 52 are engaged. The engagement recesses 53 and 54 are welded. Specifically, a weld nugget is formed between the upper surfaces 51a and 52a of the engaging convex portions 51 and 52 and the bottom surface 53a of the engaging concave portions 53 and 54, and the current detection resistor 30 is connected to the low-side common wiring 29 and the ground wiring 31. Is electrically and mechanically connected.

As described above, the present embodiment has the following effects.
(1) Concave and convex engaging convex portions 51 and 52 and engaging concave portions 53 and 54 for engaging and positioning the low side common wiring 29 and ground wiring 31 and the current detection resistor 30 with each other; Is formed. Therefore, the current detecting resistor 30 is positioned with respect to the low-side common wiring 29 and the ground wiring 31 by engaging the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54 respectively. By simply engaging the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54 having a simple configuration such as a concavo-convex shape, the low side common wiring 29 and The current detection resistor 30 can be positioned with respect to the ground wiring 31. Therefore, it is possible to prevent the position of the current detection resistor 30 and the current detection signal terminal 30a connected to the circuit board of the electric fan controller 1 from being shifted and cannot be assembled.

  (2) The low-side common wiring 29 and the ground wiring 31 are connected to the low-side common wiring 29 and the ground wiring 31 in the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54 in which the current detection resistor 30 is engaged. 31 and the current detection resistor 30 have a high degree of adhesion. Furthermore, since the upper surfaces 51a and 52a of the engaging convex portions 51 and 52 and the bottom surfaces 53a of the engaging concave portions 53 and 54 are in contact with each other, the degree of adhesion is further increased. Therefore, formation of a weld nugget becomes easy and welding strength can be improved.

(3) Since the outer diameters of the engaging convex portions 51 and 52 are formed smaller than the outer diameter of the welding electrode trunk portion X, they are easily heated intensively, and the efficiency of welding can be increased.
In addition, you may change embodiment of this invention as follows.

  In the above embodiment, the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54 are all cylindrical, but are not limited to a cylindrical shape. As long as the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54 can be engaged with each other, they may have any shape such as a quadrangular prism shape or a trapezoidal shape.

  In the above embodiment, the engagement convex portions 51 and 52 are formed in the low-side common wiring 29 and the ground wiring 31, and the engagement concave portions 53 and 54 are formed in the current detection resistor 30, but the low-side common wiring 29 and the ground wiring 31 may be formed with engaging concave portions 53 and 54, and the current detecting resistor 30 may be formed with engaging convex portions 51 and 52.

  In the above embodiment, the engaged projections 51 and 52 and the engagement recesses 53 and 54 engaged are welded. However, a place other than the engagement projections 51 and 52 and the engagement recesses 53 and 54 is used. However, welding may be applied to the place where the low-side common wiring 29 and ground wiring 31 and the current detection resistor 30 overlap each other.

  In the above embodiment, the upper surfaces 51a and 52a of the engaging convex portions 51 and 52 and the bottom surface 53a of the engaging concave portions 53 and 54 are formed to contact each other. In this case, welding may be performed at a place other than the engaging convex portions 51 and 52 and the engaging concave portions 53 and 54.

In the above embodiment, the engaging convex portions 51 and 52 are formed with an outer diameter smaller than the outer diameter of the welding electrode trunk portion X, but may be formed larger than the outer diameter of the welding electrode trunk portion X.
In the above embodiment, the present invention is used for the electric fan controller 1 of the brushless motor 3. However, the present invention is not limited to the electric fan controller 1, and other brushless motor control circuits including a current detection resistor 30 or a DC motor. You may use for a control circuit.

The technical idea that can be grasped from the above embodiment will be described below.
(A) A welding structure for an electrical component according to any one of claims 1 to 3, wherein the positioning portion includes an engaging convex portion and an engaging concave portion into which the engaging convex portion enters and is engaged. The engaging convex portion and the engaging concave portion are formed so that the outer diameter of the engaging convex portion and the inner diameter of the engaging concave portion are substantially equal, and the upper surface of the engaging convex portion and the engaging concave portion A welded structure for electrical parts, wherein the welded structure is formed so as to abut against a bottom surface.

  If comprised in this way, since the outer diameter of an engaging convex part and the outer diameter of an engaging recessed part are formed substantially equal, metal plate resistance is more reliably positioned with respect to metal plate wiring. Furthermore, the upper surface of the engaging convex portion and the bottom surface of the engaging concave portion are in contact with each other, and the degree of adhesion between the metal plate wiring and the metal plate resistance is further increased, and welding can be performed more efficiently.

(B) The welding structure for electric parts according to claim 3, wherein the control circuit is provided in the motor.
(C) The electric component welding method according to claim 5, wherein the positioning portion includes an engaging convex portion and an engaging concave portion into which the diameter convex portion is inserted, and the engaging convex portion. The outer diameter of the electrode is formed smaller than the outer diameter of the welding electrode trunk, and the welding trunk is brought into contact with the positioning portion to perform welding.

The circuit block diagram for demonstrating the controller for motor drive. The top view of resistance for electric current detection. AA sectional drawing in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric fan controller as a control circuit, 3 ... Brushless motor as a motor, 29 ... Low side common wiring as a metal plate wiring, 30 ... Current detection resistance as a metal plate resistance, 31 ... Ground as a metal plate wiring Wiring, 51, 52... Engaging protrusions constituting the positioning portion, 53, 54... Engaging recesses constituting the positioning portion.

Claims (6)

A welded structure of electrical parts that electrically and mechanically connects metal plate wiring and metal plate resistance by welding,
A welding structure for electrical parts, wherein the metal plate wiring and the metal plate resistor are formed with concave and convex positioning portions for positioning by engaging with each other. It is a welding structure of the electric parts according to claim 1,
A welding structure for electrical parts, wherein the positioning portion is welded to connect the metal plate wiring and the metal plate resistance. A welding structure for an electrical component according to claim 1 or 2,
The metal plate resistance and the metal plate wiring are electrical components that constitute a motor control circuit. A method of welding an electrical component in which a metal plate wiring and a metal plate resistance are connected electrically and mechanically by welding,
Forming an uneven positioning portion that engages and positions the metal plate wiring and the metal plate resistor,
A welding method for electrical parts, wherein the positioning is performed by engaging the positioning portions with each other to position the metal plate resistance with respect to the metal plate wiring. It is a welding structure of the electric parts according to claim 4,
A welding method for electrical parts, wherein the positioning portion is welded to connect the metal plate wiring and the metal plate resistance. A method for welding electrical parts according to claim 4 or claim 5,
The method for welding electrical parts, wherein the metal plate wiring and the metal plate resistance are electrical parts constituting a control circuit of a motor.

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