JP6960573B2 - Busbar unit and motor drive - Google Patents

Description

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

Servo amplifiers, inverters, and the like are known as motor drive devices for driving servo motors. The motor drive device includes an electronic component such as a capacitor or an inductor, a power semiconductor switching element, and a circuit board on which a power system control circuit for operating the power system control circuit is mounted.

In a motor drive, electronic components and circuit boards are electrically and mechanically connected to each other by bus bars that form electrical wiring. For example, Patent Document 1 discloses a motor control device including a bus bar for interconnecting a plurality of large-capacity electrolytic capacitors.

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

However, when multiple busbars are used, it is necessary to incorporate the busbars according to the parts in the housing and the board, it is necessary to align the positional relationship between the multiple busbars, and the cumulative tolerance of the parts is large. Or become. As a result, when assembling the parts, the substrate, the bus bar, etc., the assembly accuracy is lowered and the assembling man-hours are increased.

In the conventional motor drive device, the bus bar may vibrate due to external vibration generated by the operation of the motor or the like being transmitted to the motor drive device or vibration generated by electronic parts or the like in the motor drive device. .. When the bus bar vibrates, problems such as noise, deterioration of parts around the bus bar, and deterioration of the bus bar itself occur. For this reason, vibration countermeasures have become a problem in motor drive devices having a bus bar.

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

JP-A-2015-89244

The present disclosure has been made to solve such a problem, and even when a plurality of bus bars are used, the assembly accuracy does not decrease or the assembly man-hours do not increase, and the bus bar vibrates. It is an object of the present invention to provide a bus bar unit and a motor driving device that can suppress the above.

In order to achieve the above object, one aspect of the bus bar unit according to the present disclosure includes a plurality of bus bars and a resin substrate that supports 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.

Further, one aspect of the motor drive device according to the present disclosure includes the above-mentioned bus bar unit.

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

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. FIG. 3 is an exploded perspective view of the bus bar unit according to the embodiment. FIG. 4 is a sectional view taken along line IV-IV shown in FIG. FIG. 5 is a sectional view taken along line VV shown in FIG. FIG. 6A is a diagram for explaining a method of assembling the bus bar unit according to the embodiment. FIG. 6B is a diagram for explaining a method of assembling the bus bar unit according to the embodiment. FIG. 6C is a diagram for explaining a method of assembling the bus bar unit according to the embodiment. FIG. 6D is a diagram for explaining a method of assembling the bus bar unit according to the embodiment. FIG. 7 is a side view for explaining the first effect of the bus bar unit according to the embodiment. FIG. 8 is a cross-sectional view for explaining the second effect of the bus bar unit according to the embodiment. FIG. 9 is a plan view schematically showing the bus bar unit according to the first modification. FIG. 10 is a plan view schematically showing the bus bar unit according to the modified example 2. FIG. 11 is a plan view schematically showing the bus bar unit according to the modified example 3. FIG. 12 is a plan view schematically showing the bus bar unit according to the modified example 4.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, the arrangement positions and connection forms of the components, the steps (processes), the order of the steps, and the like shown in the following embodiments are examples, and the present disclosure is made. It is not the purpose of limiting. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present disclosure will be described as arbitrary components.

Each figure is a schematic view and is not necessarily exactly illustrated. In each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description may be omitted or simplified.

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

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

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

As an example, the motor 200 is a servomotor of a three-phase AC motor, and the motor drive device 100 is a servo amplifier that drives the servomotor. 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 is composed of, for example, a converter, a capacitor, an inverter, and the like. The main circuit unit and the control circuit unit are composed of a plurality of electronic components and one or more circuit boards on which the electronic components are mounted. Electronic components and circuit boards, or circuit boards are electrically and mechanically connected to each other by bus bars that form electrical wiring.

In the present embodiment, a plurality of bus bars are assembled as a bus bar unit 1. The bus bar unit 1 is attached to, for example, the housing of the motor drive device 100.

Hereinafter, the specific configuration of the bus bar unit 1 according to 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 bus bar unit 1. FIG. 4 is a sectional view taken along line IV-IV shown in FIG. FIG. 5 is a sectional view taken along line VV shown in FIG.

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

The bus bar unit 1 is incorporated into the motor drive device 100, for example, by mounting the resin substrate 20 together with the circuit board in 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 the ends of each bus bar 10 is electrically and mechanically connected to one of the two circuit boards. The other at both ends of each busbar 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 by mounting holes 11c, 12c, and 13c formed in the plurality of bus bars 10, respectively.

Each bus bar 10 is a conductor made 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 having 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 and the resin substrate 20 are in surface contact with each other.

The resin substrate 20 functions as a holder for holding a plurality of bus bars 10 arranged on the resin substrate 20. The resin substrate 20 is formed with a pair of claws 21 that hook both ends of each bus bar 10 in the width direction. A plurality of bus bars 10 are held by the claws 21 on the resin substrate 20.

One and the other of the pair of claw portions 21 are formed at positions facing each other in 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. As a result, the movement of each bus bar 10 in the alignment 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 shaped so as to be hooked on the surfaces of both end portions of each bus bar 10. As a result, the movement of each bus bar 10 in the direction perpendicular to the main surface of the resin substrate 20 (Z-axis direction) is restricted by the pair of claws 21.

In this way, each bus bar 10 is held by the resin substrate 20 in a state in which movement in two directions in the X-axis direction and the Z-axis direction is restricted by being hooked on 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. Further, since each bus bar 10 is hooked on a pair of claw portions 21, it is fixed to the resin substrate 20 without being adhered to the resin substrate 20 or being resin-molded.

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

A protrusion 22 is formed on the resin substrate 20. A plurality of protrusions 22 are formed so as to correspond to the holes 10b formed in each bus bar 10. Each of the plurality of protrusions 22 has a shape that fits into a hole 10b formed in each bus bar 10. By fitting the hole 10b of the bus bar 10 into the protrusion 22, the movement of the bus bar 10 in the horizontal direction (lateral direction) with respect to the resin substrate 20 is restricted. As a result, 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 is improved.

The resin substrate 20 is formed with a recess 23 in which the nut 50 is housed. The nut 50 is housed in the recess 23 and fixed to the resin substrate 20. The recess 23 is formed at a position overlapping each of the through hole 10a formed in the bus bar 10 and the mounting hole 31a of the mounting plate 31 of the electric circuit component 30. That is, the nut 50 arranged in the recess 23 is coaxial with the through hole 10a of the bus bar 10 and the mounting hole 31a of the electric wire component 30. In the present embodiment, four recesses 23 are formed. Therefore, four nuts 50 are also arranged. The nut 50 is, for example, an embedded nut, but is not limited thereto.

The resin substrate 20 configured in this manner includes polyethylene terephthalate (also referred to as "PET"), polybutylene terephthalate (also referred to as "PBT"), and polycarbonate (also referred to as "PC"). It is composed of a resin containing the above-mentioned material or an insulating resin such as polypropylene (Polypropanol, also referred to as "PP"). The plan view shape of the resin substrate 20 is, for example, a rectangle, but the shape thereof is not limited to this.

In the present embodiment, the plurality of bus bars 10 arranged on the resin substrate 20 are 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, V-phase, and V-phase, respectively. For W phase.

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 bar 10 located on the outer side of the plurality of, specifically three rows of bus bars 10, is a divided bus bar divided into a plurality of parts. The divided bus bar is composed of a plurality of metal plates. A row of busbars can consist of undivided busbars. Further, the bus bar in one row may be composed of a plurality of metal plates, that is, a bus bar divided into at least two.

Specifically, the first bus bar 11 and the third bus bar 13 are divided bus bars. As an example, each of the first bus bar 11 and the third bus bar 13 is divided into two. The first bus bar 11 is composed of a first metal plate 11a (first bus bar portion) and a second metal plate 11b (second bus bar portion). Further, the third bus bar 13 is composed of 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 housing or the like, the mounting holes 11c and 13c are mounted at predetermined positions on the corresponding circuit boards, respectively.

On the other hand, the second bus bar 12 is an undivided non-divided bus bar. That is, the second bus bar 12 is a single plate. A mounting hole 12c is formed in the second bus bar 12. When the bus bar unit 1 is incorporated into a housing or the like, the mounting holes 12c are mounted at predetermined positions on the corresponding circuit board.

A through hole 10a through which the screw 40 penetrates is formed in the first bus bar 11 and the third bus bar 13. The through holes 10a of the first bus bar 11 are formed one by one in the portions of the first metal plate 11a and the second metal plate 11b facing each other. Similarly, in the third bus bar 13, the through holes 10a of the third bus bar 13 are formed one by one in the portions of the third metal plate 13a and the fourth metal plate 13b facing each other. The second bus bar 12 is not formed with a through hole 10a through which the screw 40 penetrates.

Further, each of the first bus bar 11, the second bus bar 12, and the third bus bar 13 is formed with a hole 10b into which the protrusion 22 of the resin substrate 20 is inserted. The hole 10b is a fitting hole (matching hole) that fits into the protrusion 22. Two holes 10b are formed in the first bus bar 11. Specifically, the holes 10b of the first bus bar 11 are formed one by one in the portions of the first metal plate 11a and the second metal plate 11b facing each other. Similarly, two holes 10b are formed in the third bus bar 13. Specifically, the holes 10b of the third bus bar 13 are formed one by one in the portions of the third metal plate 13a and the fourth metal plate 13b facing each other. On the other hand, one hole 10b is formed in the second bus bar 12. The hole 10b of the second bus bar 12 is formed in the central portion of the second bus bar 12. The hole 10b of each bus bar 10 is, for example, a through hole, but is not limited to the through hole as long as it has a structure that fits with the protrusion 22, and may be a recess that does not penetrate the bus bar 10.

Further, in each of the first bus bar 11 and the third bus bar 13 divided into two, the electric circuit component 30 is arranged in the divided portion. The electric circuit component 30 is an electronic component that constitutes an electric circuit in the bus bar 10 (first bus bar 11, third bus bar 13) of the divided bus bar. That is, the first bus bar 11 and the third bus bar 13 are electrically connected to each other via the electric circuit component 30. In other words, the first bus bar 11 and the third bus bar 13 are divided to attach the electric circuit component 30.

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

In this embodiment, the electric circuit component 30 is a fuse. The electric circuit component 30 may be a relay, a switch, a reactor, or the like, in addition to the fuse.

The electric circuit component 30 is fixed to the resin substrate 20 by a screw 40. Specifically, the electric circuit component 30 is provided with a pair of conductive mounting plates 31 for fixing to the resin substrate 20. A mounting hole 31a is formed in the mounting plate 31. In the electric circuit component 30, the first bus bar 11 (or the third bus bar 13) has a mounting hole 31a corresponding to each of the through hole 10a of the first bus bar 11 (or the third bus bar 13) and the nut 50 fixed to the resin substrate 20. 3 It is arranged in the bus bar 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 into the mounting hole 31a and the through hole 10a and screwed into the nut 50, so that the electric circuit component 30 is made of resin via the first bus bar 11 (or third bus bar 13) which is a split bus bar. It is screwed to the substrate 20. That is, the first bus bar 11 (or the third bus bar 13) and the electric circuit component 30 are fastened together by the screw 40 and the nut 50, and the first bus bar 11 (or the third bus bar 13) is attached to the electric circuit component 30. It is sandwiched between the plate 31 and the resin substrate 20.

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

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

First, as shown in FIG. 6A, a resin substrate 20 in which the nut 50 is housed in the recess 23 is prepared. The nut 50 is embedded and fixed in the recess 23 of the resin substrate 20.

Next, as shown in FIG. 6B, a plurality of bus bars 10 (first bus bar 11, second bus bar 12, 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 bar 10 is arranged on the resin substrate 20 so that the hole 10b of each bus bar 10 fits into the protrusion 22 of the resin substrate 20, and each bus bar 10 is snap-fitted to the pair of claws 21. Stop it.

In the present 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 bus bar 13 Each of the fourth metal plates 13b of the above is pushed into the pair of claw portions 21 until the tips of the pair of claw portions 21 are hooked on these surfaces. As a result, the movements of the first bus bar 11, the second bus bar 12, and the third bus bar 13 in the Z-axis direction and the X-axis direction are restricted by the pair of claws 21, and are held on the resin substrate 20.

At this time, the holes 10b of each bus bar 10 are fitted into the protrusions 22 of the resin substrate 20, so that each bus bar 10 is placed in a state where the through holes 10a overlap with the nuts 50.

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

As for the third bus bar 13, the electric circuit component 30 is arranged in the third bus bar 13 in the same manner as in the first bus bar 11.

Next, as shown in FIG. 6D, the electric circuit component 30 is fixed to the resin substrate 20 by the screws 40. Specifically, the screw 40 is inserted into the mounting hole 31a of the electric circuit component 30 and the through hole 10a of the first bus bar 11 (and the third bus bar 13) and screwed into the nut 50. As a result, the electric circuit component 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 the divided bus bars, are not only held on the resin substrate 20 by the claw portion 21, but also on the resin substrate 20 of the mounting plate 31 by screwing the electric circuit component 30. It is also held by the resin substrate 20 by pressing. On the other hand, the second bus bar 12, which is a non-divided bus bar, is held on the resin substrate 20 only by the claw portion 21.

As described above, the bus bar unit 1 in which the plurality of bus bars 10, the resin substrate 20, and the electric circuit component 30 are integrated (unitized) can be assembled.

(summary)
As described above, the bus bar unit 1 in the present embodiment includes a plurality of bus bars 10 and a resin substrate 20 that supports 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 on one resin substrate 20 to form a unit.

As a result, 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 into a housing or the like as a plurality of parts, a plurality of bus bars 10 are unitized as a bus bar unit 1. The bus bar 10 can be incorporated into a housing or the like. Therefore, it is possible to improve the assembly accuracy and reduce the assembly man-hours.

By the way, as described above, the first bus bar 11 and the third bus bar 13, which are the divided bus bars, have more parts related to attachment to other parts than the second bus bar 12, which is the non-divided bus bar. Therefore, in the bus bar unit 1, the mounting holes 11c of the first bus bar 11 and the mounting holes 13c of the third bus bar 13 tend to have slightly lower positional accuracy than the mounting holes 12c of the second bus bar 12.

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

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 outside. In other words, the undivided busbar is a configuration that is not located on the outermost side. According to this configuration, the bus bar unit 1 is in a state of suppressing variations in 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 high positional accuracy of the mounting holes 12c. A plurality of bus bars 10 can be incorporated into a housing or the like. Therefore, the bus bar unit 1 can improve the man-hours required for incorporating the plurality of bus bars 10 into the housing or the like.

As another example of the present embodiment, when two rows of bus bars are used, the bus bar unit can obtain the above-mentioned effects and effects if one of the bus bars is a non-divided bus bar.

Alternatively, when using five rows of busbars, the busbar unit can obtain the above-mentioned effects if at least one is an undivided busbar. In particular, if any one of the bus bars located in the second to fourth rows is a non-divided bus bar, the bus bar unit can obtain the above-mentioned effects that are more remarkable.

Moreover, the bus bar unit 1 in the present embodiment can suppress the vibration of the bus bar 10. The effect of suppressing this vibration 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.

Vibration from the outside of the motor drive device 100 in which the bus bar unit 1 is incorporated, or vibration generated by an electronic component or the like in the motor drive device 100 is transmitted to the bus bar unit 1. In this case, in the structure in which the bus bar 10 is held by the resin substrate 20 by the claw portion 21 or the like without adhesion, the bus bar 10 vibrates due to the vibration transmitted to the bus bar unit 1, as shown in FIG. Specifically, the bus bar 10 vibrates up and down in the Z-axis direction according to the natural frequency of the bus bar 10, with the mounting holes 11c, 12c, and 13c at both ends. That is, the bus bar 10 vibrates so as to undulate along the Y-axis direction.

On the other hand, in FIG. 8, since the bus bar 10 is placed on the resin substrate 20, the resin substrate 20 functions as a damper, and each bus bar 1 is caused by the resin elastic force of the resin substrate 20.
The vibration of 0 can be absorbed.

Further, in the bus bar unit 1 in FIG. 8, a 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.

As a result, as shown in FIG. 8, the vibrations of the first bus bar 11, the second bus bar 12, and the third bus bar 13 can cancel each other out. That is, since the first bus bar 11, the second bus bar 12, and the third bus bar 13 have different natural frequencies, the vibrations of the first bus bar 11, the second bus bar 12, and the third bus bar 13 are mutually canceled. Can be damped and vibrated.

As described above, the bus bar unit 1 in the present embodiment can absorb the vibration of each of the plurality of bus bars 10 by the resin substrate 20 (first effect). Further, the bus bar unit 1 can cancel the vibrations of the plurality of bus bars 10 with each other (second effect). As a result, vibration generated in each of the plurality of bus bars 10 arranged on the resin substrate 20 can be effectively suppressed.

As described above, the bus bar unit 1 in the present embodiment is incorporated into the housing or the like without lowering the assembly accuracy or increasing the assembly man-hours even when a plurality of bus bars 10 are used. Can be done. Further, the vibration of the bus bar 10 can be suppressed.

Further, in the present embodiment, at least one of the plurality of bus bars 10 is a divided bus bar divided into at least two. The split bus bar is electrically connected via the electric circuit component 30. Further, at least one of the plurality of bus bars 10 is an undivided undivided bus bar.

Since the electric circuit component 30 is relatively heavy and has high rigidity, the natural frequency becomes small. In particular, the fuse is heavy and has high rigidity. Therefore, the natural frequency of the divided bus bar connected by the electric circuit component 30 and the non-divided bus bar to which the electric circuit component 30 is not connected are significantly different. Therefore, by including the divided bus bar and the undivided bus bar in the plurality of bus bars 10, the vibration of the divided bus bar and the vibration of the undivided bus bar can be effectively performed without resonating between the divided bus bar and the undivided bus bar. Can be offset by. Therefore, the vibration generated in each of the plurality of bus bars 10 can be suppressed more effectively.

In the direction in which the plurality of bus bars 10 intersect with the extending direction (X-axis direction in each figure), the resonance vibration tends to be stronger in the bus bar unit 1 on the outer side than in the central portion of the resin substrate 20.

Therefore, in the bus bar unit 1, when a plurality of bus bars are arranged in parallel in parallel, if the bus bar located on the outermost side of the plurality of bus bars is a divided bus bar, the resonance vibration generated on the outside of the resin substrate 20 is generated. It becomes easier to suppress.

When a fuse is used as an electronic component of a motor drive device, the vibration resistance of the fuse has been an issue. However, by using the fuse as the electric circuit component 30 of the split bus bar as in the present embodiment, the natural frequencies of the split bus bar and the non-split bus bar can be significantly different. Therefore, the vibration of the split bus bar and the vibration of the non-split bus bar can be effectively offset, and the vibration generated in each bus bar 10 can be efficiently damped. That is, by using a fuse as the electric circuit component 30 as in the present embodiment, each bus bar 10
Not only can the problem of vibration occurring in the fuse be solved, but also the problem of vibration resistance of the fuse can be solved.

In the present embodiment, the first bus bar 11 which is a divided bus bar, the second bus bar 12 which is a non-divided bus bar, and the third bus bar 13 which is a divided bus bar are arranged in this order. That is, a second bus bar 12, which is a non-divided bus bar, is arranged between the first bus bar 11 and the third bus bar 13, which are divided bus bars. As a result, the vibration generated in each of the plurality of bus bars 10 can be suppressed more effectively than in the case where the divided bus bar and the non-divided bus bar are continuously arranged so as to be adjacent to each other.

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

As a result, each bus bar 10 can be easily held by the resin substrate 20 without being adhered to the resin substrate 20. As a result, the bus bar unit 1 can be easily assembled. Therefore, since the workability is improved, the plurality of bus bars 10 can be easily incorporated into the housing or the like without spending man-hours for assembly. Further, 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, each of the plurality of bus bars 10 is provided with holes 10b, and the resin substrate 20 is provided with a plurality of protrusions 22 that fit into the holes 10b of each bus bar 10.

With this configuration, the protrusions 22 are fitted into the holes 10b of each bus bar 10, so that each bus bar 10 can be positioned with respect to the resin substrate 20. As a result, even when a plurality of bus bars 10 are used, it is possible to prevent erroneous assembly and simplify assembly. Therefore, the plurality of bus bars 10 can be easily incorporated into the housing or the like without spending a lot of assembly man-hours. By fitting the hole 10b of the bus bar 10 and the protrusion 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 assembly accuracy can be further improved.

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

Further, the motor driving device 100 of the present embodiment may include a bus bar unit 1.

(Modification example)
Although the bus bar unit 1 and the motor drive device 100 according to the present disclosure have been described above in the embodiment, the present disclosure is not limited to the embodiment.

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 to this. The number of bus bars 10 arranged on the resin substrate 20 may be two, or may be four or more (for example, six).

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

Even with this configuration, the vibration of each of the first bus bar 11 and the second bus bar 12 can be absorbed by the resin substrate 20. Further, the vibration of the first bus bar 11 and the vibration of the second bus bar 12 can be mutually offset. Thereby, the vibration generated in the first bus bar 11 and the second bus bar 12 can be effectively suppressed.

(Modification 2)
FIG. 10 is a plan view schematically showing the bus bar unit 1B according to the second modification. As a plurality of bus bars 10, only two second bus bars 12, which are undivided bus bars, may be placed on the resin substrate 20 as the bus bar unit 1B shown in FIG. 10. Further, although not shown, only two first bus bars 11 which are divided bus bars as a plurality of bus bars 10 may be placed on the resin substrate 20.

As described above, even if the plurality of bus bars 10 are only undivided bus bars or only divided bus bars, the vibration of each bus bar 10 can be absorbed and suppressed by the resin substrate 20 as described with reference to FIG. 7. Play the effect of.

(Modification example 3)
FIG. 11 is a plan view schematically showing the bus bar unit 1C according to the modified example 3. In this case, even if the plurality of bus bars 10 are only undivided bus bars or only divided bus bars, if the plurality of bus bars 10 have different shapes from each other as in the bus bar unit 1C shown in FIG. 11, each bus bar 10 is used. The natural frequencies of are different. Therefore, as described with reference to FIG. 8, the second effect of being able to absorb the vibrations of the bus bars 10 with each other, cancel each other out, and attenuate the vibrations is also obtained. Further, although not shown, if the plurality of bus bars 10 are only undivided bus bars or only divided bus bars, and even if they have the same shape, the width or thickness of each bus bar 10 is different. The natural frequency of each bus bar 10 is different. As a result, the vibrations of the bus bars 10 can be absorbed with each other, canceled out, and attenuated, which is a second effect.

(Modification example 4)
FIG. 12 is a plan view schematically showing the bus bar unit 1D according to the modified example 4. Like the bus bar unit 1D shown in FIG. 12, the resin substrate 20 may be further formed with ribs 24 for determining the positions of the electric circuit components 30. As a result, the electric circuit component 30 can be easily placed at predetermined positions of the first bus bar 11 and the third bus bar 13. Therefore, the bus bar unit 1D can be assembled more easily.

Further, in the embodiment, the three bus bars 10 (first bus bar 11, second bus bar 12, and third bus bar 13) are used for the U phase, the V phase, and the W phase, but the present invention is not limited to this. .. Further, 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.

Further, in the embodiment, the motor drive device 100 in which the bus bar unit 1 is incorporated is a servo amplifier, but the present invention is not limited to this. The motor drive device 100 may be an inverter device or the like.

Further, in the embodiment, the bus bar unit 1 is incorporated in the motor drive 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 drive device 100. In this case, the load of the power supply device including the bus bar unit 1 may be an electric device other than the motor.

In addition, the components and functions in the embodiment and the modified example can be arbitrarily set in a form obtained by applying various modifications conceived by those skilled in the art, or in the range not deviating from the purpose of the present disclosure. The forms realized by the combination are also included in the present disclosure.

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

1, 1A, 1B, 1C, 1D Bus bar unit 10 Bus bar 10a Through hole 10b Hole 11 1st bus bar 11a 1st metal plate 11b 2nd metal plate 11c, 12c, 13c Mounting hole 12 2nd bus bar 13 3rd bus bar 13a 3rd Metal plate 13b 4th metal plate 20 Resin substrate 21 Claws 22 Protrusions 23 Recesses 24 Ribs 30 Electric circuit parts 31 Mounting plate 31a Mounting holes 40 Screws 50 Nuts 100 Motor drive device 200 Motor

Claims (9)

With multiple busbars
A resin substrate that supports the plurality of bus bars is provided.
The plurality of bus bars are placed on the same surface of the resin substrate and fixed to the resin substrate in the bus bar unit .
At least one of the plurality of bus bars is a divided bus bar divided into at least two.
The split bus bar is electrically connected via an electric circuit component.
Busbar unit. At least one of the plurality of busbars is an undivided, undivided busbar.
The bus bar unit according to claim 1. When three or more of the plurality of bus bars are arranged in parallel, the bus bar located on the outermost side of the plurality of bus bars is the divided bus bar.
The bus bar unit according to claim 1. 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 this order.
The first bus bar and the third bus bar are the divided bus bars.
The bus bar unit according to claim 2 , wherein the second bus bar is the non-divided bus bar. The resin substrate is formed with ribs for determining the positions of the electric circuit components.
The bus bar unit according to any one of claims 1 to 4. The electric circuit component is a fuse.
The bus bar unit according to any one of claims 1 to 5. Each of the plurality of bus bars is provided with a hole.
The resin substrate is provided with a plurality of protrusions that fit into the holes of the plurality of bus bars.
The bus bar unit according to any one of claims 1 to 6. With multiple busbars
A resin substrate that supports the plurality of bus bars is provided.
The plurality of bus bars are placed on the same surface of the resin substrate and fixed to the resin substrate in the bus bar unit.
The resin substrate is formed with a pair of claws for hooking both ends in the width direction of each of the plurality of bus bars.
At least one set of the pair of claws is provided for each of the plurality of bus bars .
Bus bar unit. The bus bar unit according to any one of claims 1 to 8 is provided.
Motor drive.

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