JP2010130723A - Motor-driven apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven apparatus capable of uniforming resistance from a substrate to terminal pins to improve noise performance, reducing a manufacturing cost, and improving the vibration absorbing performance of a connecting bus bar to suppress the generation of conduction failure. <P>SOLUTION: The motor-driven apparatus includes: terminal pins 82 upright from a substrate 5 to an excitation coil of a stator and connected to the excitation coil; and connecting bars 81 provided on the substrate 5 so as to supply a drive current and connected to the terminal pins 82. In the motor-driven apparatus, the connecting bars 81 connected to the terminal pins 82 respectively have the same shape, the terminal pins 82 are arranged at interval of 120 degrees in a circumferential direction centered at the rotating axis of the rotor, the connecting bars 81 each extend from the terminal pins 82 in the circumferential direction centered at the rotating axis, and upright piece portions 811 each as a portion for connecting each connecting bar 81 to the substrate 5 are arranged at interval of substantially 120 degrees in the circumferential direction centered at the rotating axis of the rotor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric device referred to as a so-called brushless motor used for an air conditioner of an automobile.

Conventionally, a brushless type electric device in which a rectifying mechanism such as a brush is not provided in an electric device is known from, for example, Patent Document 1 and the like.
Such an electric device includes a stator in which a plurality of exciting coils are arranged in a circumferential shape, and a rotor in which permanent magnets that rotate with respect to the stator and attract the exciting coils are arranged in a circumferential shape. Yes. In addition, the exciting coil of the stator is connected to each terminal pin of three phases (U phase, V phase, W phase), and each terminal pin is connected to a joint bar on the board side via a connection bus bar. Yes.
JP 2002-186233 A

However, in the technique described in Patent Document 1 described above, the connecting bus bars are formed in different lengths and shapes.
For this reason, the electrical resistance from a board | substrate to the terminal pin of each layer differs. The inventors of the present application have found that this difference in electrical resistance causes noise to be picked up.
In addition, since connection bus bars having different shapes are required for each phase, the number of parts is increased, and manufacturing costs are increased compared to those using a single part.
Furthermore, in the structure where the length of the connecting bus bar is different, especially the short one has a lower vibration absorption performance than the long one, exceeds the stress limit value, breaks, or the solder connection part peels off. In other words, there is a high risk of poor conduction.

  The present invention was made paying attention to the above-mentioned conventional problems, and it is possible to make the resistance uniform from the substrate to the terminal pin, improve the noise performance, and reduce the manufacturing cost. And it aims at providing the electric device which can improve the vibration absorption performance of a bus bar for connection, and can control the occurrence of poor conduction.

  In order to achieve the above-described object, the present invention provides a stator having a plurality of excitation coils, a rotor that is rotatably supported with respect to the stator and that rotates by suction and repulsion with the excitation coils, A board provided with a control circuit for controlling the magnetic field generated by the stator by switching the supply state of the drive current, a terminal pin raised from the board toward the excitation coil and connected to the excitation coil, and the drive current And a connection bar connected to the terminal pin, wherein each connection bar is of the same shape, and the terminal pin is It is arranged at intervals of approximately 120 degrees in the circumferential direction around the rotation axis of the rotor, and each connection bar extends from the terminal pin to the rotation axis. The electric device is characterized in that it extends in the circumferential direction as a center, and the connection portions to the substrate are arranged at intervals of about 120 degrees in the circumferential direction around the rotation axis. .

  According to a second aspect of the present invention, in the electric device according to the first aspect, a deformation promoting portion that facilitates deformation of the connection bar is provided in a portion extending in a circumferential direction of the connection bar. It was set as the electric device characterized by having.

  According to a third aspect of the present invention, in the electric device according to the second aspect, the deformation promoting portion includes a bent portion obtained by bending the connection bar in a radial direction of the rotation center axis. It was set as the electric device characterized.

  According to a fourth aspect of the present invention, in the electric device according to the second or third aspect, the deformation promoting portion includes a removal portion from which a part of the connection bar is removed. The device.

  According to a fifth aspect of the present invention, in the electric device according to any one of the first to fourth aspects, the substrate includes a first narrow hole and a second narrow hole extending in two orthogonal directions. A support hole is formed, and an insertion portion formed in a substantially L-shaped cross-sectional shape is formed in the connection portion of the connection bar to the substrate so as to be inserted into the first narrow hole and the second narrow hole. It was set as the electric device characterized by having.

  According to a sixth aspect of the present invention, in the electric device according to the fifth aspect, the insertion portion is formed with a convex portion that protrudes in the width direction of each fine hole and is pressed against the inner periphery of each fine hole. It was set as the electric device characterized by having.

In the electric device of the present invention, since each connection bar is shared, the electric resistance of the portion that supplies the drive current from the substrate to the exciting coil can be equalized, and the influence of noise due to non-uniform electric resistance can be prevented. In addition, since the connection bar of each phase is formed in the same shape, the parts can be shared and the cost can be reduced as compared with the connection bar having a different shape in each phase.
Furthermore, since the connection part of the connection bar to the substrate is arranged in a circumferential shape and the connection bar extends in the circumferential direction, all the connection bars can be formed in the same length and in a long shape. It becomes possible. Therefore, the vibration absorption capacity of all connection bars can be improved. Compared with the shortened one of the connection bars, the connection bars are broken due to exceeding the stress limit, and the continuity failure is caused by peeling of the solder connection parts. Can be prevented.

In the invention according to claim 2, since the connection bar is provided with a deformation promoting portion that facilitates deformation, the vibration absorption performance of the connection bar is enhanced, and the breakage of the connection bar due to exceeding the stress limit is further suppressed. it can.
In the invention according to claim 3, the deformation promoting portion includes a bent portion obtained by bending the connection bar in the radial direction of the rotation center axis, and the elastic modulus is reduced by easy processing to reduce vibration absorption performance. Can be improved.
Furthermore, in the invention according to claim 4, the deformation promoting portion is provided with a removal portion from which a part of the connection bar is removed, and this invention also has a shock absorbing performance by reducing the elastic modulus by easy processing. Can be improved.

In the fifth aspect of the invention, when the connection bar is temporarily fixed to the substrate, the insertion portion having a substantially L-shaped cross section is inserted into the first narrow hole and the second narrow hole of the support hole of the substrate. In this case, for the input in the direction orthogonal to the rising direction from the substrate of the connection bar, it can be received by the two L-shaped surfaces of the insertion portion, compared with the case where the insertion portion is simply a strip shape, The support strength is improved and the temporary fixing strength of the connection bar is improved.
Furthermore, in the invention according to claim 6, since the convex portion formed in the insertion portion is pressed against the inner periphery of each narrow hole, the relative movement of the insertion portion with respect to each narrow hole is This is more restrictive than those that do not have a temporary fixing performance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
An electric device according to an embodiment of the present invention includes a stator (3) having a plurality of excitation coils (33), and is rotatably supported with respect to the stator (3). A substrate (5) provided with a control circuit for controlling the magnetic field generated by the stator (3) by switching the supply state of the drive current to the excitation coil (33) by rotating the rotor (4) by repulsion; A terminal pin (82) that is raised from (5) toward the exciting coil (33) and connected to the exciting coil (33), and provided on the substrate (5) so as to be able to supply the drive current; And a connecting bar (81) connected to the terminal pin (82), wherein each connecting bar (81) has the same shape, and the terminal pin (82) The rotating shaft (41) of the rotor (4) is arranged at an interval of approximately 120 degrees in the circumferential direction, and each connection bar (81) extends from the terminal pin (82) to the rotating shaft (41). The central portion extends in the circumferential direction, and the connection portions to the substrate (5) are arranged at intervals of about 120 degrees in the circumferential direction around the rotating shaft (41). This is an electric device.

  Below, based on FIGS. 1-4, the electrically-driven apparatus A of Example 1 of the best embodiment of this invention is demonstrated.

  The electric apparatus A according to the first embodiment is applied to, for example, a blower unit of an automobile air conditioner, and is used to rotate a sirocco type fan 1.

As shown in FIG. 3, the electric device A includes a case 2, a stator 3, and a rotor 4.
The case 2 accommodates the substrate 5, the switching element 6, and the like. The case 2 includes an upper case 21 and a lower case 22, and an accommodation space 23 is formed between the cases 21 and 22. A flange 21f for attachment extends in the outer peripheral direction on the outer periphery of the upper case 21.

The stator 3 is fixed to the upper case 21, a stator housing 31 fixed to the upper case 21, a core 32 attached to the outer periphery of the stator housing 31, and a plurality of exciting coils 33 wound around the core 32. It is equipped with.
The stator housing 31 is formed in a substantially cylindrical shape, and a flange 31 f extending in the outer diameter direction at the lower end thereof is fixed to the upper case 21.
Although not shown, the core 32 is a laminate of thin metal plates and is fixed to the outer periphery of the stator housing 31.
In this embodiment, a plurality of exciting coils 33 corresponding to the three phases of the U phase, the V phase, and the W phase are provided.

The rotor 4 is provided with a rotating shaft 41 penetrating the stator housing 31, a substantially inverted saddle-shaped yoke 42 fixed to the distal end side of the rotating shaft 41, and a plurality of rotors 4 in the circumferential direction on the inner periphery of the yoke 42. And a permanent magnet 43.
The rotating shaft 41 is rotatably supported by the stator housing 31 via a bearing 34. A blower fan 1 is attached to the tip of the rotating shaft 41.

  The yoke 42 is made of metal, and the rotor 4 is rotated by the interaction between the permanent magnet 43 fixed to the yoke 42 and the magnetic field of the exciting coil 33 of the stator 3.

A wiring pattern (not shown) is provided on the substrate 5, and a switching element 6 for switching the drive current flowing through the exciting coil 33 of the stator 3 and a control circuit (not shown) for controlling the switching are mounted.
The switching element 6 is in contact with a heat sink 7 for heat dissipation.

Further, in the first embodiment, a drive control circuit 8 for supplying a drive current to the exciting coil 33 is provided on the substrate 5.
In the drive control circuit 8, connection bars 81, 81, 81 and terminal pins 82, 82, 82 are provided between the substrate 5 and the exciting coil 33 as shown in FIG. Each connection bar 81 is electrically connected to the substrate 5 so that a drive current can be supplied from the substrate 5. The terminal pin 82 is electrically connected to the connection bar 81 and the excitation coil 33.

The terminal pin 82 is formed in a thin plate shape with metal, and on the circumference of the substrate 5 around the axis of the rotation shaft 41 at the outer diameter direction position of the shaft through hole 51 through which the rotation shaft 41 passes. It passes through the pin through holes 52 opened at equal intervals in the circumferential direction, that is, at intervals of 120 °, and is erected substantially parallel to the rotation shaft 41 (see FIG. 3).
At the tip of the terminal pin 82, there is provided a hook portion 82a for connecting the exciting coil 33 by folding the cut and raised portion into a substantially L-shaped cross section.

The connection bar 81 connects the circuit on the substrate 5 and the terminal pin 82, and extends in the circumferential direction so as to surround the shaft through hole 51 (see FIG. 2).
The connection bar 81 is formed in a thin plate shape from metal, and is electrically connected to a circuit on the substrate 5 and raised from the substrate 5, and a tip portion of the rising piece 811. An intermediate extending portion 812 extending in the circumferential direction from the outer peripheral portion of the intermediate extending portion 812, and a joining piece portion 813 joined to the terminal pin 82 by welding at the tip of the intermediate extending portion 812.

  The rising piece portion 811 is formed in a substantially rectangular thin plate shape, and as shown in FIG. 2, a terminal pin 82 (for example, 82 (a) in FIG. 2) to which the joining piece portion 813 is coupled and a counterclockwise shape in the figure. A terminal pin 82 (for example, 82 (b) in FIG. 2) adjacent in the rotation direction is disposed at a position in the outer diameter direction, inserted into a support hole 53 opened in the substrate 5, and penetrates the substrate 5, 5 is provided with a base end connection portion (connection portion: plug-in portion) 814 connected to the drive circuit 5.

  As shown in FIG. 4, the support hole 53 includes a first narrow hole 531 extending in a tangential direction of an arc centered on the axis of the shaft through hole 51 (in the direction of arrow SS in the drawing), and the first narrow hole 531. And a second fine hole 532 extending in the outer diameter direction of the shaft center (in the direction of arrow OT in the drawing) from the intermediate portion of the first central portion.

  The base end connection portion 814 is formed by bending only the base end portion of the rising piece portion 811 into a base portion 814a inserted into the first narrow hole 531 and a substantially L shape in the outer diameter direction with respect to the base portion 814a. The bent portion 814b is substantially L-shaped. In addition, convex portions 814c, 814c, and 814d that are convex in the thickness direction and extend in the thickness direction of the substrate 5 are formed in the base portion 814a and the bent portion 814b of the base end connection portion 814. The convex portions 814c, 814 c and 814 d are pressed against the support hole 53 so that no gap is formed between the support hole 53 and the support hole 53.

  The intermediate extension 812 is formed in a thin plate shape substantially parallel to the substrate 5. The intermediate extension portion 812 is provided with a deformation promoting portion 815 that facilitates deformation in the direction along the rotation shaft 41 and in the radial direction of the rotation shaft 41.

In the first embodiment, the deformation promoting portion 815 includes a bent portion 815a and a hollow portion 815b shown in FIG.
The deformation promoting portion 815 is bent in a substantially W shape so as to meander the intermediate extending portion 812 in the radial direction of the rotating shaft 41.
The hollow portion 815 b is formed by cutting out the center portion in the width direction of the intermediate extending portion 812 along the extending direction of the intermediate extending portion 812.

Next, a connection procedure between the drive circuit of the substrate 5 and the terminal pins 82 will be briefly described.
The terminal pin 82 hooks and electrically connects the plurality of exciting coils 33 to the hook portions 82a of the terminal pins 82 of the corresponding phases.
On the other hand, the connection bar 81 inserts the proximal end connection portion 814 into the support hole 53 of the substrate 5 and temporarily fixes it in the standing state. At this time, the base portion 814a of the base end connection portion 814 and the convex portions 814c, 814c, and 814d of the bent portion 814b are pressed into the first narrow hole 531 and the second narrow hole 532 of the support hole 53 without any gaps, respectively. And since the base part 814a and the bending part 814b are supported by two surfaces of the tangent direction of arrow SS and the radial direction of arrow OT orthogonal to this, it is firmly temporarily fixed.

  In this state, the terminal pin 82 is inserted into the pin through hole 52 of the substrate 5, and the stator housing 31 is attached to the upper case 11 side so as to contact the joining piece portion 813 of the connection bar 81. Then, the terminal pin 82 and the connecting piece portion 813 of the connection bar 81 are electrically connected by welding or soldering. Further, the portion protruding from the pin through hole 52 of the terminal pin 82 to the back side of the substrate 5 and the portion protruding to the back side of the substrate 5 of the connection bar 81 are brazed to the drive circuit of the substrate 5 respectively. Connect by such as.

In the first embodiment configured as described above, the effects listed below can be obtained.
a) Since the connection bar 81 for connecting the drive circuit for supplying the drive current to the substrate 5 and the terminal pins 82 connected to the excitation coils 33 of the U-phase, V-phase, and W-phase are shared. The electrical resistance in the connection portion can be made uniform, and noise can be reduced as compared with the connection bar 81 having a different shape and different electrical resistance. In addition, since noise can be reduced, it is possible to reduce the cost by omitting the circuit configuration for preventing noise.

  b) Since the connection bar 81 of each phase can be shared, the number of parts can be reduced and the cost can be reduced as compared with the case where different connection bars are used in the UVW phase.

  c) Since the rising piece portion 811 which is a connection portion of the connection bar 81 to the substrate 5 and the base end connection portion 814 at the lower end thereof are arranged circumferentially, and the connection bar 81 extends in the circumferential direction, It is possible to form the connection bar 81 in the same length and in a long shape. Therefore, the vibration absorbing ability of all the connection bars 81 can be improved, and the connection bar 81 is damaged due to exceeding the stress limit or the conduction failure due to the peeling of the solder connection part, as compared with the case where any one of the connection bars is shortened. Can be prevented.

d) Since the deformation promoting portion 815 that facilitates deformation in the axial direction and the radial direction of the rotation shaft 41 is provided in the intermediate extension portion 812 of the connection bar 81, vibration absorption of the connection bar 81 with respect to vibration during rotation of the rotor 4 is achieved. The performance is improved, and the breakage of the connection bar 81 due to exceeding the stress limit can be further suppressed.
e) The deformation promoting portion 815 includes a bent portion 815a in which the connection bar 81 is bent in the radial direction of the rotating shaft 41, and the vibration absorption performance can be improved by reducing the elastic modulus by easy processing. it can.
f) The deformation promoting portion 815 includes a hollow portion 815b from which the intermediate portion in the width direction of the connection bar 81 is removed, and the impact absorption performance can be improved by reducing the elastic modulus with easy processing.

  g) When the connection bar 81 is temporarily fixed to the substrate 5, the base end connection portion 814 having a substantially L-shaped cross section is connected to the first narrow hole 531 and the second narrow hole 532 that are substantially orthogonal to the support hole 53 of the substrate 5. I was going to plug it in. In this case, the L-shaped base portion 814a of the base end connection portion 814 is input in the direction perpendicular to the rising direction of the connection bar 81 from the substrate 5 and in the tangential direction and radial direction of the arc coaxial with the rotation shaft 41. Further, it can be received by two surfaces of the bent portion 814b, and the support strength is improved and the temporary fixing strength of the connection bar 81 is improved as compared with the case where the base end connection portion is simply a strip shape.

h) Since the convex portions 814c, 814c, and 814d formed on the proximal end connection portion 814 are in pressure contact with the inner circumferences of the respective narrow holes 531 and 532, relative to the respective narrow holes 531 and 532 of the proximal end connection portion 814. The movement is regulated more than that without the convex portions 814c, 814c, and 814d, and the temporary fixing performance is further improved.
This also improves work performance.

  As mentioned above, although embodiment and Example 1 of this invention were explained in full detail with reference to drawings, specific structure is not restricted to this Embodiment and Example 1, and does not deviate from the summary of this invention. A degree of design change is included in the present invention.

  For example, in the first embodiment, the electric device is applied to a blower unit of an automobile air conditioner. However, the electric device is not limited to an automobile, but can be applied to other blower units such as household and industrial use. Furthermore, the present invention can be applied not only to the blower unit but also to other household and industrial devices.

  In the first embodiment, the electric motor is shown in which the rotor 4 is provided on the outer side of the stator 3, but conversely, the present invention can be applied to a motor in which the rotor is provided on the inner side of the stator.

  In the first embodiment, the connection bar 81 has a length substantially overlapping the two terminal pins 82 and 82 adjacent in the circumferential direction in the radial direction, but is not limited thereto. Longer than this is advantageous in preventing breakage beyond the stress limit. Further, if desired performance can be obtained, it may be formed shorter than that shown in the embodiment.

Moreover, although the deformation | transformation promotion part 815 showed what was provided with the bending part 815a and the hollow part 815b, it is good also as a structure which provided only any one.
Further, the deformation promoting part may be provided at a place other than the intermediate extension part as long as it facilitates the deformation of the connection bar. Furthermore, the deformation promoting part is not limited to the bent part 815a and the hollow part 815b shown in the embodiment, for example, a part where the plate thickness of the connection bar is partially reduced, or a bent part, You may use what was bent in the thickness direction of the connection bar. Further, as the removal portion, in addition to the hollow portion 815b shown in the first embodiment, a part of the connection bar may be cut out from the edge side, or a hollow portion in which a part is hollowed out. It is not limited to what was formed in the groove | channel shape continuous in the extension direction like Example 1, You may use what provided multiple round or polygonal holes.

  Moreover, in Example 1, although the L-shaped direction of the base end connection part 814 as an insertion part was made into the tangential direction and radial direction, if the direction is two directions substantially orthogonal, in Example 1, It is not limited to the direction shown, for example, you may incline at about 45 degrees to radial direction.

  Moreover, in Example 1, although the convex part showed what was bent and formed by the substantially constant cross-sectional thickness, it is not limited to this, You may form only thickness in a convex part. . Furthermore, the shape, number, and protruding direction of the convex portions are not limited to those shown in the first embodiment, and for example, the protruding portions may protrude in both directions in the thickness direction of the connection bar. In this case, a large number of them may be provided to form a wave shape.

It is a perspective view which shows the principal part of the electrically-driven apparatus A of Example 1 of the best form of this invention. FIG. 3 is a plan view illustrating a main part of the electric device A according to the first embodiment. 1 is a cross-sectional view showing an electric device A of Example 1. FIG. FIG. 6 is a cross-sectional view showing a state in which a base end connection portion 814 of the electric device A of Example 1 is inserted into a support hole 53.

Explanation of symbols

3 Stator 4 Rotor 5 Substrate 33 Excitation coil 41 Rotating shaft 53 Support hole 81 Connection bar 82 Terminal pin 531 First narrow hole 532 Second narrow hole 811 Upright piece (connection portion)
814 Base end connection part (connection part: plug-in part)
814a Base part 814b Bending part 814c Convex part 814d Convex part 815 Deformation promoting part 815a Bending part 815b Void part (removal part)
A Electric device

Claims (6)

A stator having a plurality of exciting coils;
A rotor that is rotatably supported with respect to the stator and rotates by suction and repulsion with the excitation coil;
A substrate provided with a control circuit for controlling the magnetic field generated by the stator by switching the supply state of the drive current to the excitation coil;
Terminal pins raised from the substrate toward the excitation coil and connected to the excitation coil;
A connection bar provided on the substrate so as to be able to supply the drive current, and connected to the terminal pin;
An electric device comprising:
Each connection bar has the same shape,
The terminal pins are arranged at intervals of approximately 120 degrees in the circumferential direction around the rotation axis of the rotor,
Each connection bar extends from the terminal pin in the circumferential direction around the rotation axis, and the connection portion to the substrate is spaced approximately 120 degrees in the circumferential direction around the rotation axis. It is arrange | positioned by the electric device characterized by the above-mentioned.   The electric device according to claim 1, wherein a deformation promoting portion that facilitates deformation of the connection bar is provided at a portion extending in a circumferential direction of the connection bar.   The electric device according to claim 2, wherein the deformation promoting portion includes a bent portion obtained by bending the connection bar in a radial direction of the rotation center axis.   4. The electric device according to claim 2, wherein the deformation promoting portion includes a removal portion obtained by removing a part of the connection bar. 5. A supporting hole having a first narrow hole and a second narrow hole extending in two orthogonal directions is formed on the substrate,
The insertion portion formed in a substantially L-shaped cross-sectional shape so as to be inserted into the first narrow hole and the second narrow hole is formed in a connection portion of the connection bar to the substrate. The electric device of any one of Claims 1-4.   The electric device according to claim 5, wherein a convex portion that protrudes in a width direction of each narrow hole and is press-contacted to an inner periphery of each narrow hole is formed in the insertion portion.

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