JP2008196950A - Three-phase electrical component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase electrical component capable of measuring accurately a current flowing in each three-phase AC power supply line. <P>SOLUTION: A bus bar assembly 12 and a sensor substrate 13 are assembled with a screw 25 in the arranged state in due order on a base part 11. In the bus bar assembly 12, three bus bars 14a, 14b are resin-molded so as to be positioned on the same virtual plane at prescribed intervals, and a plurality of metal sleeves 16a, 16b are resin-molded in the orthogonal state to the virtual plane. On the sensor substrate 13, three current sensors 24a-24c are mounted on prescribed positions corresponding to arrangement of the three bus bars 14a, 14b. The upper end of the metal sleeve 16a is projected from the surface of the bus bar assembly 12, and a recessed part capable of positioning the sensor substrate 13 to the bus bar assembly 12 by being fitted with the end of the metal sleeve 16a is formed on the sensor substrate 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a three-phase electric component, for example, a three-phase electric component suitably used for measuring a current flowing through each power line of a three-phase AC motor.

  When a three-phase AC motor is controlled to shift by an inverter, a feedback control may be performed by detecting a current supplied (output) from the inverter to the three-phase AC motor. When feedback control is performed on the inverter, it is necessary to detect at least two-phase currents, and it is necessary to detect three-phase currents in order to improve control accuracy.

Conventionally, a measuring apparatus that accurately measures each current flowing in a plurality of current conductors to be measured has been proposed (see, for example, Patent Document 1). As shown in FIG. 7, this measuring apparatus includes three current conductors 81 A, 81 B, 81 C to be measured, three magnetic detectors 82 A, 82 B, 82 C, and a detection signal processor 83. Each of the current conductors 81A to 81C to be measured is made of a conductor having a rectangular cross section and a linear shape as a whole, and a current to be measured flows therethrough. The measured current conductor 81B has a bent portion 85 at a part thereof in order to avoid the obstacle 84. And each to-be-measured current conductor 81A-81C is arrange | positioned so that the length direction may become mutually parallel in the same plane. The magnetic detectors 82A to 82C respectively detect the strength of the magnetic field generated by the current flowing through the current conductors 81A to 81C to be measured, and output a detection signal corresponding to the detected intensity. The detection signal processing unit 83 performs predetermined arithmetic processing on each detection signal from the magnetic detection units 82A to 82C, thereby obtaining the magnitude of each current flowing through the current conductors 81A to 81C to be measured. Yes.
JP 2005-207771 A

  The detection signal processing unit 83 assumes that the arrangement relationship between each of the current conductors 81A to 81C to be measured and each of the magnetic detection units 82A to 82C is set in advance. Based on the detection signal, the magnitude of each current flowing through the current conductors 81A to 81C to be measured is calculated. Further, the magnetic detectors 82A to 82C also detect magnetic fluxes generated by currents flowing through the current conductors to be measured other than the corresponding current conductors to be measured, so that each current flowing through the plurality of current conductors 81A to 81C is accurately measured. Therefore, it is necessary to correctly arrange the distances between the current conductors 81A to 81C to be measured and the magnetic detectors 82A to 82C at predetermined distances. However, Patent Document 1 does not specify the positioning structure.

  Further, when the magnetic detectors 82A to 82C are arranged independently at a predetermined distance from the current conductors 81A to 81C to be measured, the assembly error may be increased if they are assembled to different brackets.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a three-phase electrical component capable of accurately measuring the current flowing through each three-phase AC power line. It is in.

  In order to achieve the above object, according to the first aspect of the present invention, three conductors are located on the same virtual plane at a predetermined interval, and a plurality of grounding sleeves are orthogonal to the virtual plane. And a sensor board on which a plurality of current sensors are mounted at predetermined positions corresponding to the arrangement of the three conductors. The sensor board has a surface opposite to the surface on which the current sensor is mounted in contact with the conductor assembly component, and is fixed to the conductor assembly component in a state where it can be grounded via a grounding sleeve.

  In this invention, the three conductors constitute the conductor assembly component in a state of being resin-molded at a predetermined interval. A plurality of current sensors are mounted on the sensor board at predetermined positions corresponding to the arrangement of the three conductors. Therefore, if the sensor substrate is positioned and fixed to the conductor assembly component, each current sensor is arranged in a predetermined positional relationship with respect to each conductor. If the three-phase electrical parts are used so that the three conductors constitute a part of each three-phase AC power line, the current flowing through each three-phase AC power line can be accurately measured. it can. Further, since the sensor substrate is fixed to the conductor assembly component in a state where it can be grounded via the grounding sleeve, the sensor substrate can be easily grounded. Further, if the sensor board is fixed to the conductor assembly part using screws or bolts that penetrate the grounding sleeve, the number of steps for providing the screw or bolt insertion holes is reduced.

  According to a second aspect of the present invention, in the first aspect of the invention, the conductor assembly component is provided with a base portion on a surface opposite to the sensor substrate, and the sensor substrate and the conductor assembly component. Are fixed to the base portion via screws or bolts inserted from the sensor substrate side into the grounding sleeve. In the present invention, when a three-phase electrical component is used such that three conductors constitute a part of each three-phase AC power line, the three-phase electrical component is placed at a predetermined position via the base portion. Because it is attached to, it becomes easy to install.

  The invention according to claim 3 is the invention according to claim 2, wherein the base portion is divided into a plurality of parts having the same shape. In order to reduce the size of the conductor assembly parts, if the distance between each conductor is narrowed, the base part is not a simple block or plate, but a groove or partition, in order to secure the space distance and creepage distance between adjacent conductors. Part is formed. In that case, if the whole base part is formed in one, the cost of a metal mold | die will become high and the quantity of resin used will increase. In this invention, since the base part is divided | segmented and comprised in the same shape, manufacturing cost can be reduced.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects of the present invention, the conductor assembly component has an end of the grounding sleeve on a surface facing the sensor substrate. The sensor board is formed with a recess that can be positioned with respect to the conductor assembly part of the sensor board by fitting with the end portion. In this invention, the end portion of the grounding sleeve functions as a convex portion for positioning, and the sensor substrate is fixed in a state where the sensor substrate is accurately positioned by fitting the end portion of the grounding sleeve with the concave portion. Thus, the current sensor can be accurately arranged at a predetermined position with respect to the three conductors for measuring the current. Further, since the positioning projection is not newly provided but the end of the grounding sleeve is used, the configuration is simplified.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the three conductors are used in a state of constituting a part of an output line of a three-phase inverter. The In the present invention, the amount of current output from the output line of the three-phase inverter can be detected with high accuracy, and when the three-phase AC motor is shift-controlled with the inverter, feedback control can be performed with high accuracy.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical component for three phases which can perform the measurement of the electric current which flows into each power supply line of a three-phase alternating current accurately can be provided.

(First embodiment)
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the three-phase electrical component 10 includes a base portion 11, a bus bar assembly 12 as a conductor assembly component fixed to the base portion 11, and the base portion 11 with respect to the bus bar assembly 12. And a sensor substrate 13 assembled on the opposite surface.

  As shown in FIG. 3, the bus bar assembly 12 is resin-molded so that the bus bars 14a and 14b as three conductors are located on the same virtual plane with a predetermined interval (equal interval in this embodiment). Yes. Of the three bus bars 14a and 14b, the bus bar 14a disposed at the center is formed such that the terminal portion 14c extends straight, and the two bus bars 14b disposed so as to sandwich the bus bar 14a are connected to the terminal portion 14c. Is bent in a direction away from the bus bar 14a.

  As shown in FIGS. 1 and 3, the mold resin portion 15 of the bus bar assembly 12 is formed in a rectangular plate shape, and metal sleeves 16a and 16b as grounding sleeves are orthogonal to the virtual plane near the four corners. The resin is molded in one piece. As shown in FIG. 1, of the four metal sleeves 16 a and 16 b, two metal sleeves 16 a located on one diagonal line of the mold resin portion 15 are end portions on the side facing the sensor substrate 13. Is formed so as to protrude from the surface of the mold resin portion 15. The other two metal sleeves 16 b are formed so that the end portion on the side facing the sensor substrate 13 is positioned on the same plane as the surface of the mold resin portion 15.

  On both surfaces of the mold resin portion 15, protrusions 17 are formed at positions near the terminal portions 14 c of the bus bars 14 a and 14 b so as to extend in a direction orthogonal to the bus bars 14 a and 14 b. Moreover, the convex part 18 is formed in the state which becomes a right angle with the protruding item | line 17 so that it may be located between the terminal parts 14c of bus-bar 14a, 14b. The ridges 17 are provided to ensure a creepage distance between the bus bars 14a, 14b and the metal sleeves 16a, 16b. The convex portion 18 and the groove 21b are provided to ensure a creeping distance between the bus bars 14a and 14b or between the terminal portions 14c of the bus bars 14a and 14b.

  The base portion 11 is made of resin, and as shown in FIG. 1, the metal sleeve 19 corresponds to the metal sleeves 16 a and 16 b at positions corresponding to the terminal portions 14 c when the bus bar assembly 12 is assembled to the base portion 11. The metal sleeves 20 are integrally formed at the positions. Each metal sleeve 19 is provided so as to protrude from the bottom surface of the base portion 11 (the surface opposite to the bus bar assembly 12). Each metal sleeve 20 is formed with a female thread portion (not shown) near the lower end of the inner surface. In addition, a groove 21a capable of accommodating the ridge 17 is formed in the base portion 11, and a first end portion is continuous with the groove 21a at a position corresponding to between the adjacent terminal portions 14c, and a second end A groove 21 b is formed in which a portion opens on the side surface of the base portion 11.

  The sensor substrate 13 is formed in a rectangular shape, and holes 22 a and 22 b are formed at positions corresponding to the metal sleeves 16 a and 16 b in a state where the sensor substrate 13 is assembled to the bus bar assembly 12. The holes 22a and 22b are formed to have the same diameter as the holes of the metal sleeves 16a and 16b. As shown in FIG. 4 (a), on the back surface of the sensor substrate 13 (the surface facing the bus bar assembly 12), there is a recess 23 that can be fitted to the protruding end of the metal sleeve 16a at a position corresponding to the hole 22a. That is, the recess 23 having a diameter larger than that of the hole 22a is formed to be the same center as the hole 22a. In this embodiment, the protruding end portion of the metal sleeve 16a constitutes a convex portion for positioning, and the concave portion 23 fits with the end portion of the metal sleeve 16a to constitute a concave portion that can be positioned with respect to the bus bar assembly 12 of the sensor substrate 13. To do.

  A circuit (not shown) is formed on the surface of the sensor substrate 13, and current sensors 24a, 24b, and 24c are surface-mounted at positions corresponding to the bus bars 14a and 14b, respectively. As the current sensors 24a to 24c, sensors configured to detect the strength of a magnetic field generated by current flowing through the bus bars 14a and 14b are used. Further, a pattern (not shown) is formed on the back surface of the sensor substrate 13 around the holes 22a and 22b so as to contact the metal sleeves 16a and 16b and ground the sensor substrate 13.

  The bus bar assembly 12 and the sensor substrate 13 pass through the holes 22a and 22b and the metal sleeves 16a and 16b, and are fixed to the base portion 11 by screws 25 that are screwed into the female screw portions of the metal sleeve 20. Since the sensor board 13 is assembled in a state of being positioned with respect to the bus bar assembly 12, as shown in FIG. 4 (b), the current sensors 24a to 24c have a preset positional relationship with respect to the bus bars 14a and 14b. It is arranged with. The sensor substrate 13 is grounded via the metal sleeves 16 a and 16 b and the metal sleeve 20.

  Next, the operation of the three-phase electrical component 10 configured as described above will be described. The three-phase electrical component 10 is used in a state that constitutes a part of an output line of an inverter device that controls a three-phase AC motor. In the electrical configuration for controlling the three-phase AC motor, for example, as shown in FIG. 5, the three-phase inverter 30 includes a three-phase AC motor 32 via output lines 31u, 31v, 31w as three-phase power supply lines. It is connected to the. When the three-phase inverter 30 is mounted on a vehicle and used, a DC power supplied from a battery or a fuel cell (not shown) is input as a power source, and a target output is obtained by switching control of three sets of switching elements. AC is output to the output lines 31u, 31v, 31w. When used in a factory, etc. instead of being mounted on a vehicle, the AC / DC converter converts the AC supplied from the AC power source into a DC current instead of a DC power source such as a battery or fuel cell. Thus, it may be used as a DC power source. In the three-phase electrical component 10, one terminal portion 14c of the bus bars 14a, 14b is connected to the three-phase inverter 30 side of the output lines 31u, 31v, 31w, and the other terminal portion 14c is connected to the output lines 31u, 31v, 31w. By being connected to the three-phase AC motor 32 side, the bus bars 14a, 14b constitute part of the output lines 31u, 31v, 31w.

  The controller 33 that controls the three-phase inverter 30 includes a CPU (Central Processing Unit) 34 and a memory (not shown). The controller 33 is electrically connected to a position sensor 35 as position detecting means for detecting the position of a rotating shaft (not shown), and inputs a detection signal of the position sensor 35. Current sensors 24 a to 24 c that detect the amount of current flowing through the output lines 31 u, 31 v, and 31 w are electrically connected to the controller 33 via the signal processing unit 36. The signal processing unit 36 calculates the amount of current flowing through each output line 31u, 31v, 31w based on the detection signals of the current sensors 24a-24c, and outputs a data signal indicating the amount of current flowing through each output line 31u, 31v, 31w. Output to the controller 33. The CPU 34 of the controller 33 controls the three-phase AC motor 32 to have a target output based on the output signals from the position sensor 35 and the signal processing unit 36.

According to this embodiment, the following effects can be obtained.
(1) The three-phase electrical component 10 is assembled to the bus bar assembly 12 and the bus bar assembly 12 which are resin-molded in a state where the three bus bars 14a and 14b are positioned on the same virtual plane at a predetermined interval. In addition, a plurality of current sensors 24a to 24c are provided with a sensor substrate 13 mounted at a predetermined position corresponding to the arrangement of the three bus bars 14a and 14b. The sensor substrate 13 is fixed to the bus bar assembly 12 in a state where the surface opposite to the surface on which the current sensors 24a to 24c are mounted contacts the bus bar assembly 12 and can be grounded via the metal sleeves 16a and 16b. Therefore, if the sensor board 13 is positioned and fixed to the bus bar assembly 12, the current sensors 24a to 24c are arranged in a predetermined positional relationship with respect to the bus bars 14a and 14b, so that each power line (output line 31u, 31v, 31w) can be accurately measured.

  (2) Since the sensor substrate 13 is fixed to the bus bar assembly 12 in a state where it can be grounded via the metal sleeves 16a and 16b, the sensor substrate 13 can be grounded easily. Further, if the sensor board 13 is fixed to the bus bar assembly 12 using the screws 25 penetrating the metal sleeves 16a and 16b, the man-hours for providing the screw insertion holes are reduced.

  (3) The bus bar assembly 12 is provided with a base portion 11 on the surface opposite to the sensor substrate 13, and the sensor substrate 13 and the bus bar assembly 12 have screws 25 inserted through the metal sleeves 16a and 16b from the sensor substrate 13 side. It is being fixed to the base part 11 via. Accordingly, when the three-phase electric component 10 is used so that the three bus bars 14a and 14b constitute a part of each of the three-phase AC power lines (output lines 31u, 31v and 31w), the three-phase electric machine is used. Since the component 10 is attached at a predetermined position via the base portion 11, the attachment is simplified.

  (4) The bus bar assembly 12 is provided so that the end of the metal sleeve 16a protrudes from the surface on the side facing the sensor substrate 13, and the bus bar of the sensor substrate 13 is fitted to the end of the sensor substrate 13 A recess 23 that can be positioned with respect to the assembly 12 is formed. Therefore, by fitting the end of the metal sleeve 16a and the recess 23, the sensor substrate 13 is fixed in a state of being accurately positioned on the bus bar assembly 12, and the current is measured with respect to the three bus bars 14a and 14b for measuring current. The sensors 24a to 24c can be accurately arranged at predetermined positions. Further, since the positioning convex portion is not newly provided, but the positioning convex portion is also used as the end portion of the metal sleeve 16a, the configuration is simplified.

  (5) When the three-phase electrical component 10 is used in a state where the three bus bars 14a and 14b constitute a part of the output line of the three-phase inverter 30, the output lines 31u, 31v and 31w of the three-phase inverter 30 The amount of current output from the three-phase inverter 30 can be detected with high accuracy, and the feedback control of the three-phase AC motor 32 by the three-phase inverter 30 can be performed with high accuracy.

  (6) As the three bus bars 14a and 14b constituting the bus bar assembly 12, the bus bar 14a disposed at the center is formed such that the terminal portion 14c extends straight, and the bus bar 14b disposed so as to sandwich the bus bar 14a is the terminal. The part 14c is formed in a bent state. Therefore, even when the outer diameter of the terminal portion 14c is larger than the width of the bus bars 14a and 14b, the bus bar assembly 12 can be made compact as compared with the case where the terminal portion 14c of the bus bar 14b is formed to extend straight. .

  (7) The conductor assembly part is configured as a bus bar assembly 12 using three bus bars 14a and 14b as three conductors. Therefore, compared with the case where a conductor having a circular cross section is used as the conductor instead of the bus bar, the conductor assembly component can be made thinner.

  (8) Since the protrusions 17 are provided on the mold resin portion 15 of the bus bar assembly 12, it is possible to secure a creepage distance between the terminal portions 14c of the bus bars 14a and 14b and the metal sleeves 16a and 16b. Moreover, since the convex part 18 is provided in the mold resin part 15 and the groove | channel 21b is provided in the base part 11, it is possible to ensure a creeping distance between the bus bars 14a and 14b or between the terminal parts 14c of the bus bars 14a and 14b. it can. Therefore, the bus bar assembly 12 can be made compact.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The conductor is not limited to the bus bars 14a and 14b having a rectangular cross section, and an electric wire having a circular cross section may be used. When using an electric wire as a conductor, it is not only necessary to attach sleeve terminals such as round terminals as terminal portions at both ends of the electric wire, but also when the cross-sectional area value is the same as that of the bus bar, that is, the same The surface current is reduced when compared by weight. Therefore, the bus bar is preferable to the electric wire.

  O You may comprise the base part 11 by dividing | segmenting into multiple in the same shape. For example, as shown in FIG. 6, the base unit 11 may be divided into two blocks 11a and 11b. In order to reduce the size of the conductor assembly part (bus bar assembly 12), if the interval between the conductors (bus bars 14a, 14b) is narrowed, the base portion 11 is used to secure the spatial distance and creepage distance between adjacent conductors. Is not a simple block or plate, it is necessary to form grooves and partitions. In that case, if the whole base part is formed in one, the cost of a metal mold | die will become high and the quantity of resin used will increase. However, when the base part 11 is divided into the same shape and configured, the manufacturing cost can be reduced. The number of divisions may be three or more.

  ○ For positioning the bus bar assembly 12 and the sensor substrate 13, instead of using the end of the metal sleeve 16a (grounding sleeve) as a positioning projection, a projection is provided at a position different from the metal sleeve 16a. 13 may be provided with a concave portion that fits the convex portion at a position corresponding to the convex portion. Further, the sensor substrate 13 may be provided with a convex portion, and the bus bar assembly 12 may be provided with a concave portion that fits the convex portion.

  ○ The positioning of the bus bar assembly 12 and the sensor substrate 13 is not limited to the method of forming the convex portions and the concave portions in the bus bar assembly 12 and the sensor substrate 13, and positioning holes are formed in the bus bar assembly 12 and the sensor substrate 13. Then, positioning may be performed by inserting a positioning pin into the hole. Further, a positioning hole may be formed in the base part 11 so that the base part 11, the bus bar assembly 12, and the sensor substrate 13 are positioned.

  The three-phase electrical component 10 may not include the base portion 11. For example, the mold resin part 15 of the bus bar assembly 12 may be enlarged, and an attachment part to a part to which the three-phase electrical component 10 is attached may be provided. Further, a female screw part into which the screw 25 can be screwed may be provided at a part to which the three-phase electrical component 10 is attached, and the screw 25 may be screwed into the female screw part to be attached.

  ○ The three-phase electrical component 10 is not limited to one that is used in a state that constitutes part of the output lines 31u, 31v, 31w of the three-phase inverter 30, but is also used as a power supply line for electrical equipment that uses three-phase AC as a power source You may apply to the electric current measurement which flows.

  The method of detecting the current flowing through each of the three bus bars 14a and 14b is not limited to the method of detecting by arranging the three current sensors 24a to 24c in a state of one-to-one correspondence with the respective bus bars 14a and 14b. . For example, two current sensors are arranged at positions corresponding to the gaps between the adjacent bus bars 14a and 14b, and the current flowing through each bus bar 14a and 14b is calculated by the CPU based on the detection signals of both current sensors. You may do it.

  In the configuration in which the sensor board 13 and the bus bar assembly 12 are fixed to the base portion 11 with the four screws 25, the number of metal sleeves 16a and 16b for grounding the sensor board 13 is not limited to four, but is three or less. Also good. In that case, a hole through which the screw 25 is inserted is formed at a location where the metal sleeve is not provided.

  The fixing of the sensor substrate 13 and the bus bar assembly 12 to the base portion 11 is not limited to a configuration that uses four screws or bolts, and may be a configuration that is fixed with two or more screws or bolts.

The following technical idea (invention) can be understood from the embodiment.
-In the invention as described in any one of Claims 1-4, a bus bar is used as the said conductor, and the terminal part is formed in the both ends of each bus bar.

The schematic exploded perspective view of the electrical component for three phases of one Embodiment. The perspective view of the electrical component for three phases. The top view of a bus-bar assembly. (A) is sectional drawing of a sensor board | substrate, (b) is a schematic cross section which shows arrangement | positioning of each current sensor and each bus bar. The block diagram which shows the electrical structure which carries out inverter control of the three-phase alternating current motor. The perspective view of the base part in another embodiment. The perspective view of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Base part, 12 ... Bus bar assembly as conductor assembly parts, 13 ... Sensor board, 14a, 14b ... Bus bar as conductor, 16a, 16b ... Metal sleeve as grounding sleeve, 23 ... Recess, 24a, 24b , 24c ... current sensor, 25 ... screw, 30 ... three-phase inverter, 31u, 31v, 31w ... output line.

Claims (5)

  Three conductors are positioned on the same virtual plane at a predetermined interval, and a plurality of grounding sleeves are resin-molded in a state of being orthogonal to the virtual plane, and the conductor assembly parts And a sensor board on which a plurality of current sensors are mounted at predetermined positions corresponding to the arrangement of the three conductors, and the sensor board is opposite to the surface on which the current sensor is mounted. A three-phase electrical component, wherein a surface is in contact with the conductor assembly component and is fixed to the conductor assembly component in a state where the surface can be grounded via a grounding sleeve.   The conductor assembly component is provided with a base portion on a surface opposite to the sensor substrate, and the sensor substrate and the conductor assembly component are provided with screws or bolts inserted from the sensor substrate side into the grounding sleeve. The three-phase electric component according to claim 1, wherein the three-phase electric component is fixed to the base portion via a pin.   The three-phase electric component according to claim 2, wherein the base portion has the same shape and is divided into a plurality of portions.   The conductor assembly component is provided so that an end portion of the grounding sleeve protrudes on a surface facing the sensor substrate, and the sensor substrate is fitted with the end portion and the conductive portion of the sensor substrate is fitted. The electrical component for three phases according to any one of claims 1 to 3, wherein a recessed portion that can be positioned with respect to the body assembly component is formed.   The three-phase electric component according to any one of claims 1 to 4, wherein the three conductors are used in a state of constituting a part of an output line of a three-phase inverter.

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