WO2022264728A1 - 電流センサ保持構造、電気機器及びインバータ装置 - Google Patents

電流センサ保持構造、電気機器及びインバータ装置 Download PDF

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Publication number
WO2022264728A1
WO2022264728A1 PCT/JP2022/020327 JP2022020327W WO2022264728A1 WO 2022264728 A1 WO2022264728 A1 WO 2022264728A1 JP 2022020327 W JP2022020327 W JP 2022020327W WO 2022264728 A1 WO2022264728 A1 WO 2022264728A1
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WO
WIPO (PCT)
Prior art keywords
current sensor
upper hook
main body
fitting
hook main
Prior art date
Application number
PCT/JP2022/020327
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English (en)
French (fr)
Japanese (ja)
Inventor
佑磨 田中
Original Assignee
株式会社明電舎
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社明電舎 filed Critical 株式会社明電舎
Priority to JP2022528282A priority Critical patent/JPWO2022264728A1/ja
Publication of WO2022264728A1 publication Critical patent/WO2022264728A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • the present invention relates to a current sensor holding structure applied to electrical equipment such as an inverter device for electric vehicles.
  • Electric vehicles have built-in inverters that control the motors that drive the wheels. Further, in the inverter device, a current sensor is often used for control and measurement. 2. Description of the Related Art
  • a current sensor holder disclosed in Japanese Patent Application Laid-Open No. 2002-200313 is a prior art of a structure for holding a current sensor that is assembled in an inverter device for an electric vehicle.
  • the current sensor holder is generally made of resin molding, and the busbar and the casing that holds the busbar are insert-molded.
  • the hooks (snap fit) at the upper and lower portions of the current sensor holder and the positioning portions at the left and right portions of the current sensor holder mate the current sensor and the current sensor holder.
  • the current sensor is locked by the hooks of the upper and lower parts, but there is a gap between the lower surface of the hooks of the upper part and the upper surface of the current sensor.
  • the current sensor holder is designed so that when the current sensor is assembled, a gap is created between the lower surface of the hook of the upper portion and the upper surface of the current sensor. This gap is for facilitating the work of fitting the current sensor to the current sensor holder.
  • the busbar is inserted through the through-hole of the current sensor. This allows the current sensor to measure the current flowing through the busbar.
  • the inverter device attached to the vehicle is susceptible to vibration.
  • the conventional current sensor holding structure when the current sensor is assembled to the current sensor holder, there is a gap between the lower surface of the hook of the upper part and the upper surface of the current sensor, so the vibration that occurs when the vehicle is running is reduced. There is a concern that micro-sliding wear may occur in the current sensor holder. Due to this friction, the engaging surface of the hook at the upper portion with respect to the current sensor is gradually worn out, and eventually the current sensor may come off from the current sensor holder. In addition, since the resin thickness of the hooks in the upper portion is thin and weak against impact, they are likely to break when the holder is delivered separately.
  • an object of the present invention is to improve the vibration resistance of electrical equipment that uses a current sensor.
  • one aspect of the present invention includes a sensor accommodating portion that is fitted with a current sensor, an upper hook that abuts on the upper surface of the current sensor to lock the current sensor when the fitting is performed, and a current sensor when the fitting is performed.
  • a current sensor holding structure made of a resin molding having a lower hook that contacts the lower surface of the sensor and locks the current sensor.
  • the upper hook in the current sensor holding structure, includes an upper hook main body that abuts on the upper surface of the current sensor when the fitting is performed, and a hook main body at the tip of the upper hook main body. a locking main body portion arranged in the width direction of the upper hook main body portion for locking the current sensor by coming into contact with the end surface of the current sensor when the fitting is performed, wherein the width and thickness of the upper hook main body portion are the same as the above-mentioned It is set based on the following safety factor of the upper hook main body in the process of fitting and the following safety factor of the upper hook main body after the fitting.
  • Safety factor of the upper hook main body portion in the process leading to the fitting (breaking stress value of the upper hook main body portion in the process leading to the fitting) / (stress of the upper hook main body portion in the process leading to the fitting) value)
  • Safety factor of the upper hook main body after the fitting (breaking stress value of the upper hook main body after the fitting)/(stress value of the upper hook main body after the fitting)
  • the thickness of the upper hook main body is determined by the safety factor of the upper hook main body in the process leading to the fitting and the upper hook main body after the fitting.
  • the width of the upper hook main body is set to a thickness that makes the safety factor of the upper hook body equal to the safety factor of the upper hook main body in the process leading to the fitting and the safety factor of the upper hook main body after the fitting.
  • a margin of safety is set to a width exceeding a predetermined threshold.
  • the main body of the current sensor having a depth length shorter than the length of the upper hook is fitted with the upper hook so that the main body and the sensor are held together.
  • An auxiliary fitting portion that assists fitting with the accommodating portion is protruded.
  • An aspect of the present invention is an electrical device including the above current sensor holding structure.
  • One aspect of the present invention is an inverter device for an electric vehicle, the inverter device including the above-described current sensor holding structure.
  • FIG. 2 is a longitudinal sectional view of the current sensor holding structure; (a) A longitudinal sectional view for explaining setting of the thickness of the upper hook main body of the current sensor holding structure, (b) A plan view for explaining setting of the width of the upper hook main body. (a) A longitudinal sectional view of the current sensor holding structure for explaining the action of the current sensor holding structure, (b) A longitudinal sectional view of the upper hook of the current sensor holding structure.
  • FIG. 4 is a vertical cross-sectional view of the current sensor holding structure for explaining the operation of the current sensor holding structure; (a) A correlation diagram between the thickness of the upper hook main body and the safety factor, (b) A correlation diagram between the width of the upper hook main body and the safety factor.
  • a current sensor holding structure 1 that is one embodiment of the present invention shown in FIG. 1 is applied to a current sensor holder 3 that is one aspect of a housing that accommodates a current sensor 2 of an electrical device.
  • the electrical equipment include an inverter device for an electric vehicle.
  • the current sensor holding structure 1 locks the current sensor 2 to the current sensor holder 3 when the current sensor 2 is incorporated into the current sensor holder 3 as shown in the figure.
  • the current sensor 2 is a sensor that measures the three-phase output current of the electrical equipment.
  • the illustrated current sensor 2 is accommodated in the holder body portion 30 of the current sensor holder 3 with the three-phase bus bar 31 passing through the through hole 21 of the body portion 20 .
  • the current sensor holder 3 is formed by insert molding so that the bus bar 31 connected to the current sensor 2 is built in the holder main body 30 .
  • the current sensor holding structure 1 is made of resin molding, and has a sensor housing portion 10, an upper hook 11 and a lower hook 12 as shown in FIG.
  • the sensor accommodating portion 10 is formed inside the holder main body portion 30 of FIG. 1 and fitted with the current sensor 2 .
  • the upper hook 11 abuts on the upper surface 22 of the current sensor 2 to lock the current sensor 2 during the fitting.
  • the lower hook 12 abuts on the lower surface 23 of the current sensor 2 to lock the current sensor 2 during the fitting.
  • the upper hook 11 is integrally provided with a plurality (for example, three as shown) of upper hook body portions 13 and locking body portions 14 .
  • the upper hook main body portion 13 protrudes along the busbar 31 from the upper portion of the holder main body portion 30 and abuts on the upper surface 22 of the current sensor 2 during the fitting.
  • the width and thickness of the upper hook main body portion 13 are determined by the safety factor of the upper hook main body portion 13 in the process leading to the fitting and the upper hook main body portion after the fitting, as in formulas (1) and (2) described later. It is set based on a safety factor of 13.
  • the locking main body portion 14 is arranged in the width direction of the upper hook main body portion 13 at the distal end portion of the plurality of upper hook main body portions 13, and is brought into contact with the end surface 24 of the current sensor 2 to engage the current sensor 2 at the time of the fitting. stop.
  • the lower hook 12 consists of a plate-shaped lower hook main body portion 15 that abuts on the lower surface 23 of the main body portion 20 of the current sensor 2 during the fitting.
  • a locking hole 16 into which the lower locking portion 25 of the current sensor 2 is inserted is formed in the lower hook main body portion 15 during the fitting.
  • the lower engaging portion 25 has an inclined surface 26 that is inclined in the insertion direction of the current sensor 2 by protruding from the lower surface 23 of the main body portion 20 of the current sensor 2 so as to have an inverted trapezoidal shape in longitudinal section.
  • the inclined surface 26 allows the lower locking portion 25 of the current sensor 2 introduced into the sensor accommodating portion 10 to be easily inserted into the locking hole 16 .
  • the current sensor 2 When the current sensor 2 is fitted into the sensor accommodating portion 10 , not only the lower hook 12 but also the upper hook 11 abut against the current sensor 2 , and the current sensor 2 is held by the positioning portion 17 of the sensor accommodating portion 10 and the upper hook 11 and the lower hook 12 . is locked. As a result, the current sensor 2 can be held in a well-balanced manner, and furthermore, the contact area between the current sensor 2 and the sensor accommodating portion 10 is enlarged, and the holding force of the current sensor 2 is enhanced. Therefore, according to the current sensor holding structure 1, the vibration resistance and shock resistance of the electrical equipment in which the current sensor 2 is used are improved. It should be noted that the upper surface 22 of the current sensor 2 does not have to be entirely in contact with the upper hook 11, and if a portion of the upper surface 22 of the current sensor 2 is in contact with the upper hook 11, the holding force of the current sensor 2 is improved.
  • the contact between the upper surface 22 of the current sensor 2 and the upper hook 11 improves the holding force of the current sensor 2, but the upper hook 11 needs to be deformed more when the current sensor 2 is fitted.
  • the stress applied to the base of the upper hook indicated by the white circle increases.
  • the width W and thickness T of the upper hook main body 13 are set so that the stress applied to the base of the upper hook main body 13 of the upper hook 11 does not cause breakage.
  • the correlation between the safety factor defined by the following equations (1) and (2) and the width and thickness was derived by strength analysis. This strength analysis is performed under the condition that the resin of the current sensor holding structure is a specific material.
  • Safety factor of the upper hook body portion 13 in the process leading to the fitting (breaking stress value of the upper hook body portion 13 in the process leading to the fitting)/(stress of the upper hook body portion 13 in the process leading to the fitting) value)
  • Safety factor of upper hook main body 13 after fitting (breaking stress value of upper hook main body 13 after fitting)/(stress value of upper hook main body 13 after fitting)... (2)
  • the stress value of the upper hook main body 13 in the process leading to the fitting is, as shown in FIG. shows the stress value when the upper hook main body 13 is forcibly displaced by the length L that the upper hook main body portion 13 rides on.
  • the stress value of the upper hook main body 13 after fitting is obtained by applying the acceleration (specification value) in the direction of the white arrow to the current sensor 2 after fitting as shown in FIG.
  • the stress value at the root indicated by the white circle in the figure when applied to the portion 13 side is shown.
  • (a) of the figure shows a correlation diagram between the thickness T of the snap fit (upper hook body portion 13) and the safety factor.
  • a graph of the safety factor that decreases with increasing thickness T of the snap fit shows a graph of the safety factor of the snap fit in the process leading to the fitting.
  • the graph of the safety factor that increases as the thickness T of the snap fit increases shows the graph of the safety factor of the snap fit after the fitting.
  • the same figure (b) shows a correlation diagram between the width W of the snap fit and the safety factor.
  • a graph in which the slope of the safety factor with respect to the thickness T of the snap fit is small indicates the graph of the safety factor of the snap fit in the process leading to the fitting.
  • the graph with a large slope indicates the graph of the safety factor of the snap-fit after fitting.
  • the thickness of the upper hook main body 13 is the thickness at which the safety factor of the upper hook main body 13 in the process leading to the fitting and the safety factor of the upper hook main body 13 after the fitting are equal. was adopted as the optimal value.
  • the width of the upper hook main body portion 13 is determined by a predetermined threshold (in this embodiment, 1.70) was taken as the optimal value.
  • the optimal value for the thickness T of the upper hook main body 13 is 1.3 mm, and the optimal value for the width W of the upper hook main body 13 is 4.8 mm. obtained as
  • the current sensor can be fitted into the current sensor holder without breaking the root due to forced displacement of the upper hook.
  • the strength of the snap fit of the current sensor holder 3 is improved, the base of the upper hook main body 13 is broken, the current sensor 2, the current It prevents fine sliding wear of the sensor holder 3 and improves the holding force of the current sensor 2 . Therefore, the vibration resistance of the electrical equipment to which the current sensor holder 3 is applied is improved.
  • the current sensor holder of the present invention is not limited to the above embodiments, and may be applied to devices other than inverter devices for electric vehicles, and can be applied to general electrical equipment that receives vibration.
  • Embodiment 2 When applying the current sensor holding structure 1 of Embodiment 1 to the small current sensor 2 having a short depth length a2 shown in FIG . must be shortened accordingly.
  • e1 (3.[delta] .t )/( 2.L12 ) ( 3 )
  • the strain rate e 1 is reduced by reducing the amount of deflection ⁇ and the thickness t based on the equation (3).
  • the auxiliary fitting portion 28 is provided integrally with the housing portion 27 by molding the resin forming the housing portion 27 . Further, the depth length a 3 of the contact surface between the upper hook 11 and the housing portion 27 and the auxiliary fitting portion 28 when the housing portion 27 of the current sensor 2 is fitted with the upper hook 11 is equal to the length of the upper hook 11 . is set equal to L3 .
  • the main body portion 20 (housing portion 27) of the current sensor 2 is provided with the auxiliary fitting portion 28, so that the length L3 of the upper hook 11 can be increased. can be guaranteed for a long time. Therefore, it is possible to reduce the strain factor e2 of the root portion of the upper hook 11 when the current sensor 2 and the sensor housing portion 10 are fitted together, and it is applicable to a small current sensor 2 having a short depth length a2 in FIG. 7(d). Even in this case, the safety factor against breakage of the upper hook 11 shown in FIG. 9 is improved.
  • the length L3 of the upper hook 11 can be secured long, in addition to the effect of the first embodiment, the deformation of the upper hook 11 itself becomes easy, and the current required to generate the same deflection amount at the time of fitting. The force for pressing the sensor 2 is reduced, and the assembling workability is also improved.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
PCT/JP2022/020327 2021-06-14 2022-05-16 電流センサ保持構造、電気機器及びインバータ装置 WO2022264728A1 (ja)

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JP2022528282A JPWO2022264728A1 (enrdf_load_stackoverflow) 2021-06-14 2022-05-16

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JP2021098710 2021-06-14
JP2021-098710 2021-06-14

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WO2022264728A1 true WO2022264728A1 (ja) 2022-12-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6060659A (en) * 1997-07-29 2000-05-09 Lucent Technologies Inc. Electronic isolation shield and a method of determining the minimum number of securing points required on the shield to sufficiently secure the shield to a circuit board
JP2011053061A (ja) * 2009-09-01 2011-03-17 Tokai Rika Co Ltd 電流センサ及びそれに用いられるセンサモジュールの製造方法
WO2016171039A1 (ja) * 2015-04-23 2016-10-27 カルソニックカンセイ株式会社 バスバ組付け型電流センサ
JP2020128935A (ja) * 2019-02-08 2020-08-27 矢崎総業株式会社 電流センサ及びサービスプラグ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0754937Y2 (ja) * 1990-11-30 1995-12-18 エスエムケイ株式会社 コネクタ固定構造

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6060659A (en) * 1997-07-29 2000-05-09 Lucent Technologies Inc. Electronic isolation shield and a method of determining the minimum number of securing points required on the shield to sufficiently secure the shield to a circuit board
JP2011053061A (ja) * 2009-09-01 2011-03-17 Tokai Rika Co Ltd 電流センサ及びそれに用いられるセンサモジュールの製造方法
WO2016171039A1 (ja) * 2015-04-23 2016-10-27 カルソニックカンセイ株式会社 バスバ組付け型電流センサ
JP2020128935A (ja) * 2019-02-08 2020-08-27 矢崎総業株式会社 電流センサ及びサービスプラグ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Factor of safety", 8 May 2021 (2021-05-08), pages 1 - 6, XP093014996, Retrieved from the Internet <URL:https://en.wikipedia.org/w/index.php?title=Factor_of_safety&oldid=1022053690> [retrieved on 20220616] *

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