JP5235617B2 - Coil structure - Google Patents

Description

  The present invention relates to a coil structure, and in particular, the durability of the core is sufficiently protected, high insulation and vibration resistance can be achieved, and heat dissipation can be easily improved. The present invention relates to an excellent coil structure.

As a method for improving the insulation and vibration resistance of a coil, there is conventionally known a structure in which a circuit component including a coil is assembled on a substrate and then the circuit component is covered with a resin and protected. For example, in Patent Document 1, as a structure of an electric compressor incorporating a motor drive circuit including a coil, an inverter, etc., the motor drive circuit is covered with a resin mold material and embedded in the resin mold material. A structure is disclosed. The resin material used for such a structure is not particularly limited, but a resin such as a silicone gel having a low viscosity is used from the viewpoint of ease of filling work due to excellent castability in the resin filling region and cost reduction. Often.
JP 2002-70743 A

  However, since the core, which is the core of the coil, may have a reduced characteristic value such as inductance due to contact with a resin material, moisture, etc., the above-described covering and filling in the circuit provided with the coil If a resin is used and a resin with low viscosity and excellent castability is used as the filling resin, the resin may enter through the gap of the core case in which the core is housed, which may cause deterioration of the core performance. There are restrictions on the selection of resin materials. In addition, since the coil generates a large amount of heat, if the thermal conductivity of the filling resin is low, heat radiation is not sufficiently performed, and there is a concern that the useful life of the coil may be reduced.

  Therefore, an object of the present invention is to provide a highly durable and convenient coil structure in which the core is sufficiently protected, high insulation and vibration resistance can be achieved, and heat dissipation can be easily improved. To provide a body.

In order to solve the above problems, a coil structure according to the present invention includes a core constituting a coil core, a core case in which the core is housed, and a winding wound around the outer surface of the core case. A coil, a coil case that accommodates the coil therein, and an opening of the coil case are sealed, and a terminal portion of the winding of the coil accommodated in the coil case is inserted to hold the terminal portion. and the base member, the filled and the coil case to the base member fraction made the inside housing space of the coil by a potting resin securable in position the coil in the accommodation space, and have a, in other Along with the electrical component or the electronic component, it is arranged in a predetermined circuit forming space, and the circuit forming space is filled with a mold resin for fixing the coil structure and other electrical component or electronic component, The cutting resin has a higher viscosity and higher thermal conductivity than the mold resin, the core case is configured by a split member combining structure, and the other electric component or electronic component includes an inverter. It is provided in a drive control circuit of a motor of an electric compressor including a vehicle-mounted compressor .

  According to such a coil structure, the potting resin is filled in the accommodation space defined by the coil case and the base member as the lid member around the coil, and the coil is protected by the potting resin and the coil case. Therefore, the vibration resistance and corrosion resistance of the coil are greatly improved, and the life of the coil is extended. In addition, since the position of the terminal portion of the winding from the coil is held at a desired position by the pedestal member, the coil structure can be handled in the same manner as a conventional coil single member, and convenience and assemblability are ensured. .

  Further, from the viewpoint of preventing the temperature rise of the coil, the material of the potting resin is not particularly limited, but is preferably made of a resin having high thermal conductivity. Since the coil is covered with a potting resin with high thermal conductivity, the heat generated by the coil is efficiently discharged outside the coil case via the potting resin, and the temperature rise of the coil is kept low. Life expectancy is achieved.

  Furthermore, since the pedestal member can hold the terminal portion of the coil winding, positioning the coil itself and the winding terminal portion by configuring the terminal portion to be held at a predetermined position on the pedestal. Can be easily achieved. By fixing the arrangement of the terminal portions of the coil in this way, assembling of the coil is facilitated as described above, and the time required for the circuit assembly process is shortened. Further, since the coil according to the present invention is sealed by the coil case and the pedestal member, the assembly work can be performed without being affected by contact with other members and the convenience of the circuit assembly process. Greatly improved.

  Although it does not specifically limit in the said base member, It is preferable that the resin injection hole which can inject | pour potting resin into the accommodation space from the outside is provided. Such a resin injection hole facilitates the filling operation of the potting resin into the accommodation space, reduces the time required for assembling the coil structure, and achieves improvement in productivity.

  The coil case and the pedestal member are not particularly limited, but are preferably formed of an insulating material, and are particularly preferably made of an insulating resin material. Since the coil case and the pedestal member are made of an insulating material, the insulation of the coil sealed by the both is ensured, and problems caused by insulation failure such as short circuit are effectively prevented. Further, since the resin material is light and excellent in workability, it becomes easy to form a coil case and a pedestal member corresponding to the shape of the coil, and a reduction in processing cost is achieved.

  The coil structure according to the present invention is not particularly limited, but is suitable when applied to a coil whose core is made of an amorphous material. Since the inductance of such a coil is reduced when the amorphous state of the core is destroyed, the core case needs to be properly protected in order to maintain the useful life of the core. The structure of the present invention in which the periphery of the resin is coated with a potting resin is very useful.

The coil structure according to the present invention, that apply to a coil core case is constituted by the combined structure of the dividing member. In such a core case, it may be difficult to completely prevent undesirable foreign matters (for example, moisture) from entering the inside of the core case from the joints of the divided members, which tends to cause deterioration of the core performance. . When the present invention is applied and the periphery of the core case is covered with the potting resin, the entry of foreign matter into the core case is surely prevented, and the life of the coil is extended. In addition, since the same performance deterioration may occur if the potting resin itself enters the core case, the material of the potting resin applied to the coil structure composed of such a core case is particularly Although not limited, it is preferably made of a resin that has a high viscosity and does not easily impregnate fine gaps.

  The type of the coil according to the present invention is not particularly limited and can be applied to both a common mode coil and a normal mode coil, but is excellent in insulation and can appropriately suppress the temperature rise of the coil. For example, it is suitable for use in a common mode coil provided in a noise filter in a high voltage circuit.

Coil structure according to the present invention, that have the outer peripheral portion of the coil case is fixed on the circuit is coated with a resin. After the coil structure is placed in a predetermined circuit formation space together with other electrical components or electronic components, the resin for fixing the coil structure and other electrical components or electronic components is filled in the circuit formation space. Ru configuration der to be. The potting resin may be made of the same material as the mold resin, but the potting resin has a higher viscosity than the mold resin from the viewpoint of protecting the coil and preventing vibration . By filling potting resin with high viscosity into the housing space, as described above, the potting resin is covered with the potting resin without entering the core case, and the coil is securely fixed and vibration is prevented. In addition, the intrusion of foreign matter into the core case is surely prevented, and the life of the coil is extended. In addition, the use of a low-viscosity mold resin allows the mold resin to be easily and quickly distributed over the entire necessary area in the circuit forming space, thereby facilitating a predetermined resin filling operation. .

Upper Symbol potting resin has a higher thermal conductivity than the molding resin. By using a resin having high thermal conductivity, as described above, the heat generation of the coil is appropriately released to the outside, and the life of the coil is extended. Such a configuration is particularly useful when an electrical component or electronic component that generates a large amount of heat is provided in the circuit formation space.

Application of the coil structure according to the present invention can realize a high insulating property, it is possible to minimize the effects of vibration, and, since it can be easily carried out measures against heat generation of the coil, vibration and It is suitable to be provided in the drive control circuit of motors of electric compressors where the influence of heat generation is large, and it is used especially for electric compressors consisting of vehicle-mounted compressors that require long-term operational stability. Is preferred.

  Thus, according to the coil structure according to the present invention, the coil core is sufficiently protected, high insulation and vibration resistance can be achieved, and heat dissipation can be easily improved. A coil structure excellent in durability and convenience can be realized.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an exploded perspective view of a coil 2, a base member 3, and a coil case 4 in a coil structure 1 according to an embodiment of the present invention. In particular, a resin injection hole 9 is provided in the base member 3. The embodiment shown is shown. The coil 2 includes a core 5a constituting a coil core, a core case 5 in which the core 5a is accommodated, and a winding 6 wound around the outer surface of the core case 5. A terminal portion 7 of the winding 6 is a coil. A predetermined number is projected from 2. The base member 3 made of an insulating resin material is provided with a terminal holding portion 8 for holding the terminal portion 7, a resin injection hole 9, and a claw 10 for locking the base member 3 to the coil case 4. The coil case 4 made of an insulating resin material is provided with a claw locking portion 11 for locking the claw 10.

  When the coil structure 1 is assembled, first, the terminal portion 7 protruding from the coil 2 is assembled to the terminal holding portion 8 of the base member 3. At this time, from the viewpoint of convenience of handling, it is preferable that the coil 2 and the base member 3 are bonded to each other with an adhesive or the like. After the coil 2 is attached to the pedestal member 3, the claw 10 provided on the pedestal member 3 is locked to the claw locking portion of the coil case 4, so that the coil 2 is defined by the pedestal member 3 and the coil case 4. It is sealed in the accommodation space 13 formed. A resin injection hole 9 is provided in the pedestal member 3, and the potting resin is filled into the accommodation space 13 after sealing the coil 2 (shown as the filling resin 12 in FIG. 2). The material of the potting resin is not particularly limited, but it is preferable to use a resin having excellent thermal conductivity and high viscosity from the viewpoint of heat dissipation of the coil, protection from moisture and the like, and vibration prevention.

  FIG. 2 shows an assembled state of the coil structure shown in FIG. The coil 2 is insulated from the outside by the pedestal member 3 and the coil case 4 and is fixed by a potting resin 12 filled in the accommodation space 13 to improve vibration resistance. Furthermore, each terminal portion 7 of the coil 2 protrudes from the coil structure 1 in a state where it is inserted through the base member 3 and positioned at a predetermined position, so that the assembly work of the coil structure 1 to a desired circuit is easy. Can be

  In the coil structure 1 configured as described above, the coil 2 is sufficiently protected and insulated by the potting resin 12 in the coil case 4. Moreover, the resin can be prevented from entering the core case 5 by selecting a high viscosity resin as the potting resin 12, and the heat dissipation performance of the coil 12 can be improved by selecting a highly heat conductive resin. Furthermore, by providing an appropriate viscosity difference between the mold resin outside the core case 4 and the potting resin 12, it is possible to exhibit optimum characteristics for each resin filling portion.

  The present invention can be applied to all types of coils, and is particularly suitable for use in a vehicle-mounted electric compressor that is greatly affected by vibration and heat generation and requires long-term operation stability. .

It is a disassembled perspective view of a coil case, a coil, and a base member in a coil structure concerning one embodiment of the present invention. It is a perspective view which shows the assembly completion state of the coil structure shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil structure 2 Coil 3 Base member 4 Coil case 5 Core case 5a Core 6 Winding 7 Terminal part 8 Terminal holding part 9 Resin injection hole 10 Claw 11 Claw latching part 12 Filling resin (potting resin)
13 accommodation space

Claims (6)

A coil comprising a core constituting the coil core, a core case in which the core is housed, a winding wound around the outer surface of the core case, a coil case for housing the coil therein, and the coil case A base member that holds the terminal portion through which the terminal portion of the coil of the coil housed in the coil case is inserted, and a coil that is defined by the coil case and the base member It is filled in the housing space, and potting resin can be secured in place the coils in the accommodation space, and have a, in conjunction with other electrical or electronic components are arranged in a predetermined circuit-forming space The circuit forming space is filled with a mold resin for fixing the coil structure and other electrical or electronic components, and the potting resin has a higher viscosity and higher viscosity than the mold resin. It has high thermal conductivity, the core case is constituted by a split member combining structure, the other electric component or electronic component includes an inverter, and an electric compressor composed of a vehicle-mounted compressor. A coil structure provided in a drive control circuit of a motor .   The coil structure according to claim 1, wherein the base member is provided with a resin injection hole into which the potting resin can be injected from the outside into the accommodation space.   The coil structure according to claim 1 or 2, wherein the coil case and the base member are formed of an insulating material.   The coil structure according to claim 3, wherein the insulating material is made of resin.   The coil structure according to any one of claims 1 to 4, wherein the core is made of an amorphous material. The coil consists of common mode coil, the coil structure according to any one of claims 1-5.

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