Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F30/00—Fixed transformers not covered by group H01F19/00
  • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
  • H01F30/16—Toroidal transformers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/24—Magnetic cores
  • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
  • H01F27/266—Fastening or mounting the core on casing or support

Definitions

• the present invention relates to a case storage type magnetic core, for example, to a case storage type magnetic core used for a magnetic component used in an electronic circuit.
• a magnetic component that is formed by forming a coil around a magnetic core around a wire wound wire
• a wire with an insulation coating as the coil to prevent short-circuiting of the coil during coil formation.
• the wire wound around this core has a harder core than the insulation coating applied to the wire, so if the wire is wound directly around the core, the insulation coating on the wire may be damaged during the winding, resulting in a short circuit. .
• the former method is adopted because the shape of the magnetic core is substantially annular.
• the impact can propagate to other components, adversely affecting that component.
• the impact of the collision may cause the soldered part of the coil to peel off.
• the case When a coil is formed by winding a wire around such a case storage type magnetic core, the case may be wound around the wire and deformed, and stress may be applied to the magnetic core.
• the magnetic flux in the gap between the core and the case must be considered.
• the gap between the magnetic core and the case was filled or applied with an adhesive to prevent the movement of the magnetic core in the case ⁇ and the propagation of the vibration of the magnetic core to the case.
• An object of the present invention is to provide a case storage type magnetic core that has high reliability as a magnetic component and generates little noise. Disclosure of the invention
• a first feature of the present invention includes (a) a magnetic core, (: b) a case for accommodating the magnetic core, and (c) a powder at least partially filled in a gap between the magnetic core and the case. It is a case storage type magnetic core.
• the case and the magnetic core are fixed by filling the gap between the case and the magnetic core with powder, while preventing the loss of the vibration absorbing force due to the use of the adhesive, and the vibration of the magnetic core is transmitted to the case. To prevent or suppress.
• the filling rate of the powder filling the gap between the magnetic core and the case is, for example, in the range of 1% to 150%, preferably 10% to 150%, more preferably 10% to; %, Most preferably 10% to 100%.
• the powder filling rate was calculated by the following equation.
• the bulk density [g / cm 3 ] of the powder was measured according to ASTM D1895-69.
• case storage type magnetic core according to the present invention can use either magnetic or non-magnetic powder.
• a second feature of the present invention is that the case-containing magnetic core has a maximum value of the minor axis of the powder to be filled in a range of 5 m to 500 m.
• the maximum value of the minor axis of the powder to be filled is preferably in the range of 100 m to 400;
• the minor axis of the powder is the diameter of a pearl-shaped (circular cross-section) powder, and the shortest diameter of an irregular-shaped powder such as an elliptical cross-section. Refers to the diameter.
• a third feature of the present invention is that the powder is a case storage type magnetic core having a sily force in which a nylon resin or silicone oil is adhered to the periphery thereof.
• the powder used is, for example, polyolefin powder such as polyethylene, polypropylene and polymethyl ', alumina powder, silicon dioxide powder, etc. You can also.
• a fourth feature of the present invention is that the case is a case storage type magnetic core having a closed structure.
• noise caused by vibration of the magnetic core can be isolated by sealing the magnetic core with the case.
• a fifth feature of the present invention is that a case storage type magnetic core is used in which the magnetic core is made of an amorphous magnetic alloy ribbon.
• the case storage type magnetic core is applicable to magnetic cores made of various materials such as an amorphous alloy (for example, Fe-based amorphous alloy), gay steel, ferrite, and dust.
• FIG. 1 is an explanatory diagram showing the configuration of the case storage type magnetic core of the present invention.
• FIG. 2 is an explanatory diagram showing an outline of a noise measurement test of a case storage type magnetic core.
• FIG. 3 is a waveform diagram of the excitation signal supplied to the coil during the noise measurement test.
• FIG. 4 is a diagram showing the test results for each case storage type magnetic core.
• FIG. 5 is a graph in which the noise level of each case-storing magnetic core is plotted against the powder filling rate.
• FIG. 1 is an explanatory diagram showing the configuration of the case storage type magnetic core of the present invention.
• the case storage type magnetic core 10 according to the present embodiment includes a magnetic core 11, cases 12, 12 2 , and powder 13 as shown in FIG.
• the magnetic core 11 is accommodated in the case 12 and the powder 13 is filled in the gap between the magnetic core and the case.
• FIG. 2 is an explanatory diagram showing an outline of a noise measurement test of the case-stowed core
• FIG. 3 is a waveform diagram of an excitation signal supplied to the coil during the noise measurement test
• the magnetic core 11 used in this case-storing type magnetic core is an amorphous magnetic alloy ribbon that is a Fe-based amorphous alloy including Si and B (manufactured by Allied Signal Inc., product name: Metg 1 as 26 05 S—2, [Circular wound body with outer diameter 27. Omm, inner diameter 15.0 mm, height 10.0 mm formed by composition F e ⁇ ⁇ ,, 3 S i 9 (] Used at about 470 ° C.
• the case 12 has an outer diameter of 27.7 mm, an inner diameter of 14.7 mm, and a height of 10.3 mm (both inner dimensions) (manufactured by Toray Industries, trade name: 1184 G— 3 0.) is used.
• the powder 13 filled into the gap between the magnetic core 11 and the case 12 is made of nylon resin powder (manufactured by Sumitomo Seika Co., Ltd., product name: Floron) whose maximum diameter is 180, Two types of powders are used, such as a powder with silicone oil attached to the periphery of a sily force with a maximum value of 300 zm (Toray Dow Corning 'Silicone, product name: Trefil).
• a coil was formed by winding 31 mm of a 1. Omm0 magnetic wire around each of the case storage type cores manufactured by the above-described process to form a sample for evaluation.
• the fixing test was carried out by supporting the case-retained core by hand and shaking it strongly in a direction parallel to the laminated cross section of the core.
• the case-mounted magnetic core 10 is generated.
• the noise level was measured by measuring the noise level with a microphone 21 installed at a position 200 mm away from the center of the case storage type magnetic core 10.
• the sound pressure level at which the center frequency of the 1/3 octave band measured via the microphone 21 is 10 kHz is defined as the noise level, and the sound level depends on whether or not the noise level is 45.0 dB or less.
• the pass / fail of the noise measurement test was determined.
• the target value of 45.0 dB is based on the noise level that is clearly lower than the noise level of 58.0 dB in case-mounted magnetic cores using adhesive. It is.
• a current value and a 500-20000 Hz sweeping sine wave varying between 0 and 6 A are used as shown in FIG.
• the evaluation of each sample was mainly performed at room temperature, and some samples were also evaluated at a high temperature of 110 ° C.
• Fig 4 is a diagram showing the evaluation results of each sample in a tabular format
• Fig 5 is a diagram plotting the relationship between the noise level and the filling factor of each sample by the powder used. is there.
• Samples 1 to 3 used nylon resin powder among the 10 types of samples prepared, and Samples 4 to 10 used silicon powder with silicone oil adhered to the periphery. Using.
• the fixed test passed and the noise level was 32.3 dB, meeting the target value.
• the fixing test and the noise level were measured at a silica powder filling rate of 100.0%.
• the powder filling rate is preferably in the range of 1% to 150%, particularly preferably 10% to; L50% is more preferable, and 10% to 120% is more preferable. Preferably, 10% to 100% is most preferred.
• the maximum value of the minor axis of the powder used in the present invention is preferably in the range of 5 to 500, particularly preferably in the range of 100 to 400 m.
• case storage type magnetic core of this invention can prevent or suppress both the movement of the magnetic core in a case, and the propagation of the vibration of a magnetic core to a case, the reliability as a magnetic component is high, and in addition, a case storage type magnetic core with low noise generated during use can be obtained.
• the vibration absorbing force is not lost even when used at a high temperature.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Casings For Electric Apparatus (AREA)
• Coils Or Transformers For Communication (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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Cited By (2)

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Citations (6)

Family Cites Families (3)

• 1996
  • 1996-08-29 CA CA 2230276 patent/CA2230276A1/en not_active Abandoned
  • 1996-08-29 EP EP96928693A patent/EP0848392A4/en not_active Withdrawn
  • 1996-08-29 WO PCT/JP1996/002426 patent/WO1997009728A1/ja not_active Application Discontinuation
  • 1996-08-31 TW TW085110705A patent/TW340946B/zh active

Patent Citations (6)

Non-Patent Citations (1)

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