CN110168904A - Bus bar unit and motor drive - Google Patents

Abstract

The bus bar unit includes a plurality of bus bars and a resin substrate for supporting the plurality of bus bars, and the plurality of bus bars are placed on the same surface of the resin substrate and fixed to the resin substrate.

Description

Bus bar unit and motor drive

technical field

The present disclosure relates to a bus bar unit and a motor drive device. The present disclosure particularly relates to a bus bar unit used in a servo amplifier for driving a servo motor.

Background technique

As a motor drive device for driving a servo motor, a servo amplifier, an inverter, and the like are known. The motor drive device includes electronic components such as capacitors and inductors, and a circuit board on which a power semiconductor switching element and a power system control circuit for operating the power semiconductor switching element are mounted, and the like.

In the motor drive device, the electronic components and the circuit board are electrically and mechanically connected to each other by bus bars forming electrical wiring. For example, Patent Document 1 discloses a motor control device including a bus bar that interconnects a plurality of electrolytic capacitors having a large capacity.

In the motor drive device, since a large current flows in the power input line and the motor output line, a plurality of bus bars are used.

However, when a plurality of bus bars are used, it is necessary to incorporate the bus bars in accordance with the components and the substrate in the case, or to align the mutual positional relationship of the plurality of bus bars, or to increase the cumulative tolerance of the components. . As a result, when assembling components, substrates, bus bars, and the like, assembly accuracy decreases or assembly man-hours increase.

In the conventional motor drive device, external vibrations generated by the operation of the motor or the like are transmitted to the motor drive device, or vibrations generated by electronic components in the motor drive device are transmitted to sometimes vibrate the bus bar. When the bus bar vibrates, the following malfunctions occur, that is, noise is generated, components around the bus bar are degraded, or the bus bar itself is degraded. Therefore, in the motor drive device having the bus bar, the countermeasure against vibration becomes a problem.

In particular, when a fuse is used as an electronic component of a motor drive device, unlike a capacitor, it is difficult to fix the fuse to the case. Therefore, the fuse is in a state of being suspended in the air. Therefore, when a fuse is used, the vibration resistance of the fuse becomes a problem.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2015-89244

SUMMARY OF THE INVENTION

The present disclosure has been made in order to solve the above-mentioned problems, and an object of the present disclosure is to provide a device capable of suppressing vibration of the bus bars without deteriorating assembly accuracy or increasing assembly man-hours even when a plurality of bus bars are used. Bus bar unit and motor drive.

To achieve the object, a technical solution of the bus bar unit of the present disclosure includes a plurality of bus bars and a resin substrate for supporting the plurality of bus bars. The plurality of bus bars are placed on the same surface of the resin substrate and fixed to the resin substrate.

In addition, a technical solution of the motor driving device of the present disclosure includes the above-mentioned bus bar unit.

According to the present disclosure, even when a plurality of bus bars are used, assembly accuracy is not lowered or assembly man-hours are not increased. In addition, the vibration of the bus bar can also be suppressed.

Description of drawings

FIG. 1 is a block diagram showing a configuration of a motor drive device according to an embodiment.

FIG. 2 is a perspective view of the bus bar unit according to the embodiment.

3 is an exploded perspective view of the bus bar unit according to the embodiment.

FIG. 4 is an IV-IV cross-sectional view shown in FIG. 2 .

FIG. 5 is a V-V cross-sectional view shown in FIG. 2 .

6A is a diagram for explaining an assembling method of the bus bar unit according to the embodiment.

6B is a diagram for explaining an assembling method of the bus bar unit according to the embodiment.

6C is a diagram for explaining an assembling method of the bus bar unit according to the embodiment.

6D is a diagram for explaining an assembling method of the bus bar unit according to the embodiment.

7 is a side view for explaining the first effect of the bus bar unit according to the embodiment.

8 is a cross-sectional view for explaining a second effect of the bus bar unit according to the embodiment.

9 is a plan view schematically showing a bus bar unit according to Modification 1. FIG.

10 is a plan view schematically showing a bus bar unit according to Modification 2. FIG.

11 is a plan view schematically showing a bus bar unit according to Modification 3. FIG.

12 is a plan view schematically showing a bus bar unit according to Modification 4. FIG.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below all show a preferred specific example of the present disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps (processes), order of steps, and the like shown in the following embodiments are examples and are not intended to limit the present disclosure. Therefore, among the components of the following embodiments, components not described in the independent claims that represent the highest-level concept of the present disclosure will be described as arbitrary components.

Each figure is a schematic diagram and is not necessarily strictly illustrated. In each drawing, the same reference numerals are attached to substantially the same structures, and overlapping descriptions may be omitted or simplified in some cases.

In addition, in this specification and the drawings, the X axis, the Y axis, and the Z axis represent three axes of a three-dimensional orthogonal coordinate system. In this embodiment, the Z axis direction is the vertical direction, and the Z axis is vertical The direction (direction parallel to the XY plane) is the horizontal direction. The X-axis and the Y-axis are axes that are orthogonal to each other and both are orthogonal to the Z-axis.

(Embodiment)

The motor drive device 100 of the embodiment will be described with reference to FIG. 1 . FIG. 1 is a block diagram showing the configuration of a motor drive device 100 according to the embodiment.

The motor drive device 100 is a device for driving the motor 200 . Specifically, the motor drive device 100 supplies the electric power for operating the electric motor 200 to the electric motor 200 .

As an example, the motor 200 is a servo motor of a three-phase AC motor, and the motor drive device 100 is a servo amplifier that drives the servo motor. Therefore, the motor drive device 100 receives a control command for driving the motor 200 from the controller, and controls the rotation of the motor 200 according to the control command.

The motor drive device 100 includes, for example, a main circuit unit of a power system that controls electric power supplied via a power supply terminal, and a control circuit unit that processes a control command from a controller. The main circuit includes, for example, a converter, a capacitor, an inverter, and the like. The main circuit unit and the control circuit unit include a plurality of electronic components and one or more circuit boards on which the electronic components are mounted. The electronic component and the circuit board or the circuit boards are electrically and mechanically connected to each other by bus bars forming electrical wiring.

In this embodiment, a plurality of bus bars are aggregated into the bus bar unit 1 . The bus bar unit 1 is attached to, for example, a casing of the motor drive device 100 .

Hereinafter, the specific structure of the bus bar unit 1 of the embodiment will be described in detail with reference to FIGS. 2 to 5 . FIG. 2 is a perspective view of the bus bar unit 1 according to the embodiment. FIG. 3 is an exploded perspective view of the above-described bus bar unit 1 . FIG. 4 is an IV-IV cross-sectional view shown in FIG. 2 . FIG. 5 is a V-V cross-sectional view shown in FIG. 2 .

As shown in FIGS. 2 to 5 , the bus bar unit 1 includes a plurality of bus bars 10 and a resin substrate 20 for supporting the plurality of bus bars 10 .

For example, the bus bar unit 1 is incorporated into the motor drive device 100 by placing the resin substrate 20 together with the circuit board on the housing of the motor drive device 100 . For example, the bus bar unit 1 is arranged between two circuit boards. In this case, one of both ends of each bus bar 10 is electrically and mechanically connected to one of the two circuit boards. The other of both ends of each bus bar 10 is electrically and mechanically connected to the other of the two circuit boards. Specifically, as will be described later, the bus bar unit 1 is connected to two circuit boards using mounting holes 11 c , 12 c , and 13 c formed in the plurality of bus bars 10 , respectively.

Each of the bus bars 10 is an electrical conductor formed of a conductive material. In the present embodiment, each bus bar 10 is made of a metal material such as copper. Each bus bar 10 is a flat metal plate with a constant thickness.

The plurality of bus bars 10 are placed on the same surface of the resin substrate 20 and fixed to the resin substrate 20 . That is, each bus bar 10 is in surface contact with the resin substrate 20 .

The resin substrate 20 functions as a holder for holding the plurality of bus bars 10 arranged on the resin substrate 20 . A pair of claw portions 21 are formed on the resin substrate 20 for locking both end portions in the width direction of each bus bar 10 . The plurality of bus bars 10 are held on the resin substrate 20 by the claws 21 .

One and the other of the pair of claw portions 21 are formed at positions opposed to the width direction of each bus bar 10 . Specifically, the pair of claw portions 21 are formed so as to sandwich the side surfaces of both end portions in the width direction of each bus bar 10 . Thereby, the movement of each bus bar 10 in the arrangement direction (X-axis direction) of one and the other of the pair of claws 21 is restricted by the pair of claws 21 .

The pair of claw portions 21 are formed to be hooked on the surfaces of both end portions of each bus bar 10 . Thereby, the movement of each bus bar 10 in the direction (Z-axis direction) perpendicular to the main surface of the resin substrate 20 is restricted by the pair of claw portions 21 .

In this way, each bus bar 10 is held by the resin substrate 20 in a state where the movement in both directions of the X-axis direction and the Z-axis direction is restricted by engaging with the pair of claw portions 21 . As a result, the mounting accuracy of the mutual positional relationship of the plurality of bus bars 10 is improved. In addition, since each bus bar 10 is locked to the pair of claw portions 21 , each bus bar 10 is fixed to the resin substrate 20 without being adhered to the resin substrate 20 or by resin molding on the resin substrate 20 .

The pair of claw portions 21 are formed integrally with the resin substrate 20 . At least one set of the pair of claws 21 is provided for each bus bar 10 . In the present embodiment, two sets of a pair of claw portions 21 are provided for each bus bar 10 .

Protrusions 22 are formed on the resin substrate 20 . A plurality of protrusions 22 are formed so as to correspond to the holes 10 b formed in the respective bus bars 10 . Each protrusion 22 of the plurality of protrusions 22 has a shape that can be fitted into the hole 10 b formed in each bus bar 10 . By fitting the holes 10 b of the bus bar 10 with the protrusions 22 , the movement of the bus bar 10 in the horizontal direction (lateral direction) with respect to the resin substrate 20 is restricted. Thereby, the positioning of each bus bar 10 with respect to the resin substrate 20 can be performed, and the mounting accuracy of the mutual positional relationship of the plurality of bus bars 10 can be improved.

The resin substrate 20 is formed with a concave portion 23 for accommodating the nut 50 . The nut 50 is accommodated in the recessed portion 23 and is fixed to the resin substrate 20 . The recesses 23 are formed at positions where the through holes 10 a formed in the bus bars 10 overlap with the respective mounting holes 31 a of the mounting plate 31 of the circuit component 30 . That is, the nut 50 arranged in the recessed portion 23 is coaxial with the through hole 10 a of the bus bar 10 and the mounting hole 31 a of the circuit member 30 . In the present embodiment, four concave portions 23 are formed. Therefore, four nuts 50 are also arranged. The nut 50 is, for example, a recessed nut, but is not limited to this.

The resin substrate 20 thus constituted is composed of polyethylene terephthalate (Polyethyleneterephthalate. Also referred to as "PET".), polybutylene terephthalate (Polybutyleneterephthalate. Also referred to as "PBT".) and Polycarbonate (also known as "PC".) resin or polypropylene (Polypropylene. Also known as "PP".) and other insulating resins. The planar shape of the resin substrate 20 is, for example, a rectangle, but is not limited to this.

In the present embodiment, the plurality of bus bars 10 arranged on the resin substrate 20 are three bus bars of the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 . When the motor drive device 100 incorporating the bus bar unit 1 drives a three-phase AC motor, as an example, the first bus bar 11 , the second bus bar 12 and the third bus bar 13 are for U-phase and V-phase, respectively. Phase use and W phase use.

The first bus bar 11 , the second bus bar 12 , and the third bus bar 13 are arranged on the resin substrate 20 in this order. That is, the second bus bar 12 is arranged between the first bus bar 11 and the third bus bar 13 .

In the present embodiment, the bus bars 10 located on the outer side among the bus bars 10 in multiple rows, specifically, the bus bars 10 in the three rows are divided bus bars divided into a plurality of parts. The split bus bar is composed of a plurality of metal plates. A 1-row bus bar can be composed of non-divided bus bars. In addition, a row of bus bars may be composed of a plurality of metal plates, that is, a bus bar divided into at least two parts.

Specifically, the first bus bar 11 and the third bus bar 13 are divided bus bars. As an example, the first bus bar 11 and the third bus bar 13 are each divided into two parts. The first bus bar 11 includes a first metal plate 11a (first bus bar portion) and a second metal plate 11b (second bus bar portion). In addition, the third bus bar 13 includes a third metal plate 13a (third bus bar portion) and a fourth metal plate 13b (fourth bus bar portion). Mounting holes 11c and 13c are formed in the first bus bar 11 and the third bus bar 13, respectively. When the bus bar unit 1 is incorporated into a case or the like, the mounting holes 11c and 13c are mounted at predetermined positions of the corresponding circuit boards, respectively.

On the other hand, the second bus bar 12 is a non-divided bus bar that is not divided. That is, the second bus bar 12 is a single board. Mounting holes 12 c are formed in the second bus bar 12 . The mounting holes 12c are mounted in predetermined positions of the corresponding circuit boards when the bus bar unit 1 is incorporated into a case or the like.

The first bus bar 11 and the third bus bar 13 are formed with through holes 10 a through which the screws 40 are inserted. One through hole 10a of the first bus bar 11 is formed in each of the portions of the first metal plate 11a and the second metal plate 11b that face each other. The same is true for the third bus bar 13. The through hole 10a of the third bus bar 13 is formed one by one in each of the portions of the third metal plate 13a and the fourth metal plate 13b that face each other. In addition, the second bus bar 12 is not formed with through holes 10 a through which the screws 40 are inserted.

In addition, holes 10 b into which the protrusions 22 of the resin substrate 20 are inserted are formed in the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 , respectively. The hole 10b is a fitting hole (positioning hole) into which the protrusion 22 can be fitted. Two holes 10 b are formed in the first bus bar 11 . Specifically, the hole 10b of the 1st bus bar 11 is formed one each in the mutually opposing part of the 1st metal plate 11a and the 2nd metal plate 11b. Similarly, two holes 10 b are formed in the third bus bar 13 . Specifically, one hole 10b of the third bus bar 13 is formed in each of the portions facing each other of the third metal plate 13a and the fourth metal plate 13b. On the other hand, one hole 10 b is formed in the second bus bar 12 . The hole 10 b of the second bus bar 12 is formed in the center portion of the second bus bar 12 . In addition, the hole 10b of each bus bar 10 is, for example, a through hole, but is not limited to a through hole as long as the protrusion 22 can be fitted with a recessed portion that does not penetrate the bus bar 10 .

In addition, the first bus bar 11 and the third bus bar 13 divided into two are provided with circuit components 30 in the divided portions, respectively. The circuit component 30 is an electronic component that constitutes a circuit in the bus bar 10 (the first bus bar 11 and the third bus bar 13 ) that are divided bus bars. That is, the 1st bus bar 11 and the 3rd bus bar 13 are electrically connected via the circuit member 30, respectively. In other words, the first bus bar 11 and the third bus bar 13 are divided for mounting the circuit component 30 .

Specifically, in the first bus bar 11 , the first metal plate 11 a and the second metal plate 11 b are electrically and mechanically connected via the circuit member 30 . Similarly, in the third bus bar 13 , the third metal plate 13 a and the fourth metal plate 13 b are electrically and mechanically connected via the circuit member 30 .

In this embodiment, the circuit component 30 is a fuse. In addition, the circuit component 30 may be a relay, a switch, a reactor, or the like other than a fuse.

The circuit component 30 is fixed to the resin substrate 20 with screws 40 . Specifically, the circuit member 30 is provided with a pair of conductive mounting plates 31 for fixing to the resin substrate 20 . Mounting holes 31 a are formed in the mounting plate 31 . The circuit components 30 are arranged on the first bus bar 11 (or the third bus bar 13 ) so that the mounting holes 31 a correspond to the through holes 10 a of the first bus bar 11 (or the third bus bar 13 ) and the nuts 50 fixed to the resin substrate 20 , respectively. Article 13). That is, the mounting hole 31a, the through hole 10a, and the hole of the nut 50 overlap.

In this state, the screw 40 is inserted through the mounting hole 31 a and the through hole 10 a and screwed to the nut 50 , and the circuit component 30 is screwed through the first bus bar 11 (or the third bus bar 13 ) as the divided bus bar. on the resin substrate 20 . That is, the first bus bar 11 (or the third bus bar 13 ) and the circuit component 30 are fastened together with the screw 40 and the nut 50 , and the first bus bar 11 (or the third bus bar 13 ) is attached to the mounting plate of the circuit component 30 . 31 and the resin substrate 20 are sandwiched.

In addition, the second bus bar 12 is not screwed to the resin substrate 20 by the screws 40 . Therefore, the first bus bar 11 (or the third bus bar 13 ) as the divided bus bar to which the circuit components are screwed and the second bus bar 12 as a single non-divided bus bar are alternately arranged on the resin substrate 20 .

Next, an assembling method of the bus bar unit 1 of the embodiment will be described with reference to FIGS. 6A to 6D . 6A to 6D are diagrams for explaining an assembling method of the bus bar unit 1 according to the embodiment.

First, as shown in FIG. 6A , the resin substrate 20 in which the nut 50 is accommodated in the concave portion 23 is prepared. The nut 50 is embedded and fixed to the concave portion 23 of the resin substrate 20 .

Next, as shown in FIG. 6B , the plurality of bus bars 10 (the first bus bar 11 , the second bus bar 12 and the third bus bar 13 ) are placed on the same surface of the resin substrate 20 and held on the resin substrate 20 .

Specifically, the bus bars 10 are arranged on the resin substrate 20 so that the holes 10 b of the respective bus bars 10 are fitted with the protrusions 22 of the resin substrate 20 , and the respective bus bars 10 are locked to the pair of claws 21 by snap fitting. .

In this embodiment, the first metal plate 11a of the first bus bar 11, the second metal plate 11b of the first bus bar 11, the second bus bar 12, the third metal plate 13a of the third bus bar 13, and the third 3. The fourth metal plate 13b of the bus bar 13 is pressed into the pair of claw portions 21, respectively, until the tips of the pair of claw portions 21 are hooked on the surfaces of these members. As a result, the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 are held by the resin substrate 20 by restricting the movements in the Z-axis direction and the X-axis direction by the pair of claws 21 .

At this time, by fitting the holes 10 b of the bus bars 10 with the protrusions 22 of the resin substrate 20 , the bus bars 10 are placed in a state in which the through holes 10 a and the nuts 50 are overlapped.

Next, as shown in FIG. 6C , the circuit component 30 is mounted on the first bus bar 11 and the third bus bar 13 as divided bus bars. At this time, regarding the circuit component 30 corresponding to the first bus bar 11 , the circuit component 30 is arranged so that the mounting hole 31 a of the mounting plate 31 overlaps with the pair of through holes 10 a of the first bus bar 11 . As a result, the circuit component 30 is placed at a position sandwiched between the pair of claw portions 21 of the two sets of holding the first bus bar 11 .

In addition, about the 3rd bus bar 13, the circuit member 30 is arrange|positioned in the 3rd bus bar 13 similarly to the 1st bus bar 11.

Next, as shown in FIG. 6D , the circuit component 30 is fixed to the resin substrate 20 with the screws 40 . Specifically, the screw 40 is inserted into the mounting hole 31 a of the circuit member 30 and the through hole 10 a of the first bus bar 11 (and the third bus bar 13 ) and screwed to the nut 50 . Thereby, the circuit member 30 is screwed to the resin substrate 20 via the first bus bar 11 (and the third bus bar 13 ).

In this way, the first bus bar 11 and the third bus bar 13 which are divided bus bars are not only held on the resin substrate 20 by the claws 21 , but are also held by pressing the mounting plate 31 against the resin substrate 20 by screwing the circuit component 30 . on the resin substrate 20 . On the other hand, the second bus bar 12 , which is a non-divided bus bar, is held by the resin substrate 20 only by the claw portion 21 .

The bus bar unit 1 in which the plurality of bus bars 10 , the resin substrates 20 , and the circuit components 30 are integrated (unitized) can be assembled as described above.

(Summarize)

As described above, the bus bar unit 1 of the present embodiment includes the plurality of bus bars 10 and the resin substrate 20 for supporting the plurality of bus bars 10 . The plurality of bus bars 10 are placed on the same surface of the resin substrate 20 and fixed to the resin substrate 20 . That is, a plurality of bus bars 10 are assembled into one resin substrate 20 to form a unit.

Thereby, when incorporating a plurality of bus bars 10 into a product such as a motor drive device, instead of incorporating the plurality of bus bars 10 as a plurality of components into a case or the like, the plurality of bus bars 10 can be united as a bus bar. One component of the unit 1 is incorporated into a case or the like. Therefore, it is possible to improve assembly accuracy and reduce assembly man-hours.

In addition, as described above, the first bus bar 11 and the third bus bar 13 that are divided bus bars have more parts attached to other components than the second bus bar 12 that is a non-divided bus bar. Therefore, in the bus bar unit 1 , the mounting holes 11 c included in the first bus bar 11 and the mounting holes 13 c included in the third bus bar 13 have a higher positional accuracy than the positions of the mounting holes 12 c included in the second bus bar 12 . The accuracy tends to be slightly lower.

Therefore, in the bus bar unit 1 of the present embodiment, the second bus bar 12 which is a non-divided bus bar having the mounting hole 12c with high positional accuracy is used as a reference when it is incorporated into a case or the like. With this configuration, the other mounting holes 11c and 13c existing on the bus bar unit 1 only improve the relative positional accuracy with respect to the mounting hole 12c, and also improve the positional accuracy with respect to the predetermined position existing on the casing and the like side .

In the bus bar unit 1 of the present embodiment, the second bus bar 12 which is a non-divided bus bar is arranged in the center, and the first bus bar 11 and the third bus bar 13 which are the divided bus bars are arranged on the outer side. In other words, it is a structure in which the non-segmented bus bar is not located at the outermost side. With this configuration, the bus bar unit 1 can suppress the mounting holes 11c and 13c of the first bus bar 11 and the third bus bar 13 centering on the second bus bar 12 having a high positional accuracy of the mounting hole 12c. The plurality of bus bars 10 are incorporated into a case or the like in a state of being misaligned. Therefore, the bus bar unit 1 can reduce the man-hours required for incorporating the plurality of bus bars 10 into a case or the like.

In addition, as another example of the present embodiment, when two rows of bus bars are used, as long as any one of the bus bars is a non-divided bus bar, the bus bar unit can obtain the above-described effects.

Alternatively, when five rows of bus bars are used, as long as at least one of the bus bars is a non-divided bus bar, the bus bar unit can obtain the above-mentioned effects. In particular, as long as any one of the bus bars located in the second row to the fourth row is a non-segmented bus bar, the bus bar unit can obtain the above-mentioned effects that are more remarkable.

Furthermore, also in the bus bar unit 1 of the present embodiment, the vibration of the bus bar 10 can be suppressed. This vibration suppressing effect will be described with reference to FIGS. 7 and 8 . FIG. 7 is a side view for explaining the first effect of the bus bar unit 1 according to the embodiment. FIG. 8 is a cross-sectional view for explaining the second effect of the bus bar unit 1 described above.

Vibration from the outside of the motor drive device 100 in which the bus bar unit 1 is incorporated or vibrations generated by electronic components and the like in the motor drive device 100 are transmitted to the bus bar unit 1 . In this case, in the structure in which the bus bar 10 is held on the resin substrate 20 in a non-adhesive manner by the claws 21 and the like, as shown in FIG. 7 , the bus bar 10 vibrates due to the vibration transmitted to the bus bar unit 1 . . Specifically, the bus bar 10 vibrates so as to bend vertically in the Z-axis direction according to the natural frequency of the bus bar 10 with each of the mounting holes 11 c , 12 c , and 13 c as both ends. That is, the bus bar 10 vibrates so as to undulate in the Y-axis direction.

In contrast, in FIG. 8 , since the bus bars 10 are placed on the resin substrate 20 , the resin substrate 20 functions as a buffer and absorbs the vibration of each bus bar 10 by the resin elastic force generated by the resin substrate 20 .

In addition, in the bus bar unit 1 of FIG. 8 , the plurality of bus bars 10 are placed on the same surface of the resin substrate 20 . Specifically, the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 are placed on the same surface of the resin substrate 20 .

Thereby, as shown in FIG. 8, the vibration of the 1st bus bar 11, the 2nd bus bar 12, and the 3rd bus bar 13 can cancel each other out. That is, since the natural frequencies of the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 are different, the vibrations of the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 can be mutually cancel, so that the vibration can be attenuated.

In this way, the bus bar unit 1 of the present embodiment can absorb the vibrations of the plurality of bus bars 10 one by one by the resin substrate 20 (first effect). In addition, the bus bar unit 1 can cancel the vibrations of the plurality of bus bars 10 with each other (second effect). Thereby, the vibration generated in each of the bus bars 10 of the plurality of bus bars 10 arranged on the resin substrate 20 can be effectively suppressed.

As described above, even when a plurality of bus bars 10 are used, the bus bar unit 1 of the present embodiment can be incorporated into a case or the like without reducing assembly accuracy or increasing assembly man-hours. In addition, vibration of the bus bar 10 can also be suppressed.

In addition, in the present embodiment, at least one bus bar 10 among the plurality of bus bars 10 is a divided bus bar divided into at least two parts. The divided bus bars are electrically connected via the circuit member 30 . In addition, at least one bus bar 10 among the plurality of bus bars 10 is a non-divided bus bar that is not divided.

The weight of the circuit component 30 is relatively high, and the rigidity is relatively high, so that the natural frequency is reduced. In particular, the fuse is heavy and rigid. Therefore, the natural frequencies are greatly different between the divided bus bars connected together by the circuit components 30 and the non-divided bus bars to which the circuit components 30 are not connected. Therefore, by including the divided bus bar and the non-divided bus bar in the plurality of bus bars 10, the vibration of the divided bus bar and the non-divided bus bar can be effectively caused to be caused by the vibration of the divided bus bar and the non-divided bus bar without resonance between the divided bus bar and the non-divided bus bar. Vibration cancellation. Therefore, the vibration generated in each of the plurality of bus bars 10 can be further effectively suppressed.

In addition, in the direction intersecting the direction in which the plurality of bus bars 10 extend (the X-axis direction in each drawing), in the bus bar unit 1, the resonance vibration at the outer side of the resin substrate 20 is higher than the resonance at the center portion. Tendency to vibrate strongly.

Then, in the bus bar unit 1, when a plurality of bus bars are arranged so that three or more bus bars are arranged side by side, if the outermost bus bar among the plurality of bus bars is a divided bus bar, It is easier to suppress resonance vibration generated outside the resin substrate 20 .

When a fuse is used as an electronic component of a motor drive device, the vibration resistance of the fuse becomes a problem. However, by using the fuse as the circuit component 30 of the divided bus bar as in the present embodiment, the natural frequencies of the divided bus bar and the non-divided bus bar can be greatly different. Therefore, the vibration of the divided bus bar and the vibration of the non-divided bus bar can be effectively canceled, and the vibration generated in each bus bar 10 can be efficiently attenuated. That is, by using the fuse as the circuit member 30 as in the present embodiment, not only the problem of vibration generated in each bus bar 10 but also the problem of the vibration resistance of the fuse can be solved.

In addition, in this embodiment, the 1st bus bar 11 which is a division|segmentation bus bar, the 2nd bus bar 12 which is a non-segmentation bus bar, and the 3rd bus bar 13 which is a division|segmentation bus bar are arranged in this order. That is, between the first bus bar 11 and the third bus bar 13 which are divided bus bars, the second bus bar 12 which is a non-divided bus bar is arranged. As a result, compared with the case where the divided bus bars and the non-divided bus bars are continuously arranged adjacent to each other, the vibration generated in each of the plurality of bus bars 10 can be further effectively suppressed.

In the present embodiment, the resin substrate 20 is formed with a pair of claw portions 21 for locking both ends in the width direction of each of the bus bars 10 of the plurality of bus bars 10 . At least one set of the pair of claws 21 is provided for each of the plurality of bus bars 10 .

Thereby, each bus bar 10 can be easily held on the resin substrate 20 without being adhered to the resin substrate 20 . Thereby, the bus bar unit 1 can be easily assembled. Therefore, since workability|operativity improves, several bus bars 10 can be easily accommodated in a case etc., without consuming assembly man-hours. In addition, by providing the pair of claw portions 21, the mounting accuracy of the mutual positional relationship of the plurality of bus bars 10 is improved, so that the assembly accuracy can be further improved.

In the present embodiment, holes 10 b are provided in each of the plurality of bus bars 10 , and a plurality of protrusions 22 are provided in the resin substrate 20 , and the plurality of protrusions 22 are fitted into the holes 10 b of the bus bars 10 , respectively.

With this configuration, by fitting the protrusions 22 into the holes 10 b of the bus bars 10 , the positioning of the bus bars 10 with respect to the resin substrate 20 can be performed. Thus, even when a plurality of bus bars 10 are used, erroneous assembly can be prevented and assembly can be simplified. Therefore, the plurality of bus bars 10 can be easily incorporated into a case or the like without requiring many assembly man-hours. By fitting the holes 10 b of the bus bars 10 with the protrusions 22 of the resin substrate 20 , the mounting accuracy of the mutual positional relationship of the plurality of bus bars 10 is improved, so that the mounting accuracy can be further improved.

In addition, the plurality of bus bars 10 of the present embodiment may be the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 , the first bus bar 11 , the second bus bar 12 , and the third bus bar 12 . 13 are arranged in order, the first bus bar 11 and the third bus bar 13 are divided bus bars, and the second bus bar 12 is a non-divided bus bar.

In addition, the motor drive device 100 of the present embodiment may include the bus bar unit 1 .

(Variation)

As mentioned above, although the bus bar unit 1 and the motor drive device 100 of the present disclosure have been described in the embodiments, the present disclosure is not limited to the embodiments.

For example, in the embodiment, the three bus bars 10 of the first bus bar 11 , the second bus bar 12 , and the third bus bar 13 are arranged on the resin substrate 20 , but the present invention is not limited thereto. The number of bus bars 10 arranged on the resin substrate 20 may be two or four or more (for example, six).

(Variation 1)

For example, FIG. 9 is a plan view schematically showing the bus bar unit 1A of Modification 1. As shown in FIG. As in the bus bar unit 1A shown in FIG. 9 , only the two bus bars 10 , which are the first bus bar 11 as the divided bus bar and the second bus bar 12 as the non-divided bus bar, may be placed on the resin substrate 20 . .

With this configuration, the resin substrate 20 can also absorb vibrations of the first bus bar 11 and the second bus bar 12 one by one. Moreover, the vibration of the 1st bus bar 11 and the vibration of the 2nd bus bar 12 can cancel each other. Thereby, the vibration which generate|occur|produces in the 1st bus bar 11 and the 2nd bus bar 12 can be suppressed effectively.

(Variation 2)

FIG. 10 is a plan view schematically showing the bus bar unit 1B of Modification 2. FIG. Like the bus bar unit 1B shown in FIG. 10 , only two second bus bars 12 that are non-divided bus bars may be placed on the resin substrate 20 as the plurality of bus bars 10 . In addition, although not shown in the figure, only two first bus bars 11 serving as divided bus bars may be placed on the resin substrate 20 as a plurality of bus bars 10 .

In this way, regardless of whether the plurality of bus bars 10 are only non-divided bus bars or only divided bus bars, the first effect that the vibration of each bus bar 10 can be absorbed by the resin substrate 20 as described in FIG. 7 is obtained.

(Variation 3)

FIG. 11 is a plan view schematically showing a bus bar unit 1C of Modification 3. FIG. In this case, regardless of whether the plurality of bus bars 10 are only non-divided bus bars or only divided bus bars, as long as the shapes of the plurality of bus bars 10 are different from each other as in the bus bar unit 1C shown in FIG. 11 , each bus bar The natural frequency of 10 is different. Therefore, as described with reference to FIG. 8 , the second effect that the vibrations of the bus bars 10 can be mutually absorbed and the vibrations can be canceled and attenuated can be obtained. In addition, although not shown, even if the plurality of bus bars 10 are only undivided bus bars or only divided bus bars and have the same shape, as long as the width, thickness, etc. of the respective bus bars 10 are different, the respective bus bars 10 The natural frequencies are different. Thereby, the second effect that the vibrations of the bus bars 10 can be mutually absorbed and the vibrations can be canceled and attenuated can be obtained.

(Variation 4)

FIG. 12 is a plan view schematically showing the bus bar unit 1D of Modification 4. FIG. Like the bus bar unit 1D shown in FIG. 12 , the resin substrate 20 may further be formed with ribs 24 for determining the position of the circuit component 30 . Thereby, the circuit component 30 can be easily mounted on the predetermined position of the 1st bus bar 11 and the 3rd bus bar 13. Thus, the bus bar unit 1D can be assembled more easily.

In addition, in the embodiment, the three bus bars 10 (the first bus bar 11 , the second bus bar 12 and the third bus bar 13 ) are used for the U-phase, the V-phase and the W-phase, but it is not limited to this. In addition, when there are two bus bars 10, the two bus bars 10 can be used for the high-voltage side and the low-voltage side corresponding to the DC voltage.

In addition, in the embodiment, the motor drive device 100 in which the bus bar unit 1 is incorporated is used as a servo amplifier, but it is not limited to this. As the motor drive device 100, an inverter device or the like may be used.

In addition, in the embodiment, the bus bar unit 1 is incorporated in the motor driving device 100 , but the present invention is not limited to this, and the bus bar unit 1 may be incorporated in various power supply devices other than the motor driving device 100 . In this case, the load of the power supply device including the bus bar unit 1 may be electrical equipment other than the motor.

In addition to this, the present disclosure also includes forms obtained by applying various modifications to the embodiments and modified examples that can be conceived by those skilled in the art, or to use the embodiments and modified examples within a range that does not deviate from the gist of the present disclosure. A form that can be realized by combining the constituent elements and functions arbitrarily.

Industrial Availability

Since the technology of this disclosure can suppress the vibration of a bus bar, it can be utilized for various electronic apparatuses, such as a bus bar unit and a motor drive device.

Description of reference numerals

1, 1A, 1B, 1C, 1D, bus bar unit; 10, bus bar; 10a, through hole; 10b, hole; 11, the first bus bar; 11a, the first metal plate; 11b, the second metal plate; 11c , 12c, 13c, mounting holes; 12, the second bus bar; 13, the third bus bar; 13a, the third metal plate; 13b, the fourth metal plate; 20, the resin substrate; 21, the claw; 22, the protrusion; 23, recessed part; 24, rib; 30, circuit component; 31, mounting plate; 31a, mounting hole; 40, screw; 50, nut; 100, motor drive device; 200, motor.

Claims (10)

1. A bus bar unit, wherein, The bus bar unit includes: Multiple bus bars: and a resin substrate for supporting the plurality of bus bars, The plurality of bus bars are placed on the same surface of the resin substrate and fixed to the resin substrate. 2. The bus bar unit of claim 1, wherein, At least one bus bar among the plurality of bus bars is a split bus bar divided into at least two parts, The divided bus bars are electrically connected via circuit components. 3. The bus bar unit of claim 2, wherein, At least one bus bar among the plurality of bus bars is an undivided non-divided bus bar. 4. The bus bar unit of claim 3, wherein, When the plurality of bus bars are arranged so that three or more bus bars are arranged side by side, the outermost bus bar among the plurality of bus bars is the divided bus bar. 5. The bus bar unit of claim 3, wherein, The plurality of bus bars are a first bus bar, a second bus bar, and a third bus bar, The first bus bar, the second bus bar, and the third bus bar are arranged in the order of the first bus bar, the second bus bar, and the third bus bar, The first bus bar and the third bus bar are the divided bus bars, The second bus bar is the non-divided bus bar. 6. The bus bar unit according to any one of claims 2 to 5, wherein: Ribs for determining the positions of the circuit components are formed on the resin substrate. 7. The bus bar unit according to any one of claims 2 to 6, wherein: The circuit components are fuses. 8. The bus bar unit according to any one of claims 1 to 7, wherein: A hole is provided in each of the plurality of bus bars, The resin substrate is provided with a plurality of protrusions, and the plurality of protrusions are respectively fitted into the holes of the bus bars of the plurality of bus bars. 9. The bus bar unit according to any one of claims 1 to 8, wherein: A pair of claws for engaging both ends in the width direction of each of the plurality of bus bars are formed on the resin substrate, At least one set of the pair of claws is provided with respect to each of the plurality of bus bars. 10. A motor drive, wherein, The motor drive device includes the bus bar unit according to any one of claims 1 to 9.