Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F17/00—Fixed inductances of the signal type 
  • H01F17/04—Fixed inductances of the signal type  with magnetic core
  • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• • 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
  • H01F27/263—Fastening parts of the core together
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
  • H01F41/005—Impregnating or encapsulating

Definitions

• This invention relates to electronic inductive component that transmits radio signal from a device to another device or receives radio signal from another device.
• the transmitter or receiver inductor consist of a piece of ferrite rod core having wire coil wound onto the bobbin and later inserted with ferrite or directly wound onto the ferrite.
• the ferrite core is quite short.
• Such an inductor does not cause problem on electrical devices when the device is drop or incur sudden impact.
• the ferrite rod core is long and small in diameter such as in the case of 4 or 3 millimeters diameter with 30 millimeters length, it could break, easily.
• the inductance value and quality factor to drop and hence the two devices that are designed to communicate at a particular radio frequency would fail to communicate.
• inductor that is able to withstand drop impact. In order to achieve this, it would require a multiple shorter ferrite beads core combined together to form a long ferrite rod. Due to the fact that a lot more force is needed to break a short ferrite rod, the new inductor design would be able to withstand more serious drop impact.
• the unique part of multiple ferrite beads core is that the air gap between the ferrite exist while producing the inductor and it is much more difficult to have impact that create new crack in short ferrite bead.
• inductor is produce base on complete long ferrite rod core; and when it is broken after drop impact, it will cracks resulted in creation of air gap that causes the inductance value to drop.
• Multiple ferrite beads inductor design can be achieved by encapsulating the multiple ferrite beads core with plastic compound or silicon rubber.
• the epoxy encapsulation is only as the purpose of insulation of single ferrite rod. Ferrite rod core can still incur hairline crack if dropped and resulted in reduction of the inductance value of the inductor.
• silicon rubber would be a better choice as it has some flexibility that absorbs some impact force. This will reduce the amount of impact force that is exerted onto the ferrite cores. Due to the fact that the ferrite beads core are already quite short, they would not break easily in most cases. Encapsulation function in this design is mainly for holding together the ferrite beads core; therefore it can be achieved by molding the ferrite beads core with plastic or rubber material or alternatively by heating up shrinkable tube.
• the ferrite beads core may or may not have center hole.
• ferrite beads core may have center hole that allow insertion of a long string of plastic or metal, follow by enlarging the two ends to hold the ferrite beads core together.
• the ferrite beads rod coil is then going through magnetic wire winding process to form an inductor; or by inserting the encapsulated multiple ferrite bead cores into an air coil or bobbin coil. Of cause, it is also possible to directly insert the non-encapsulated multiple ferrite beads core into the air coil or bobbin coil.
• the ferrite bead rod core and the winding coil are then bonded together by epoxy to fix its position.
• Fig. 1 illustrates the insertion of a molded ferrite beads core through an air coil.
• HBl and HB2 are two holes created by centering pins.
• HBl are two holes located diagonally at one end of the molded piece; and
• HB2 are another two holes located diagonally as well at the other end of the molded piece.
• El are bonding epoxy to hole the coil firmly to the ferrite beads cores. It is also possible to bond the coil to encapsulation material but may produces a poor bonding.
• Fig. 2 illustrates the insertion of center linked ferrite beads core through an air coil.
• full length of ferrite rod is exposed; allowing the bonding epoxy (E2) to be applied on the whole circumference of the exposed contact area.
• CP is the centerpiece of plastic or metal material that is inserted through the ferrite beads core. The exposed two ends of the string are enlarge to prevent the ferrite beads from disintegration.
• Fig. 3 illustrates a molded ferrite beads core.
• FBI, FB2 to FBN are ferrite beads up to N pieces of beads.
• FBI are exposed area of ferrite bead number 1
• FB2 are exposed area of ferrite bead number and so on till FBN.
• SHl and SH2 are two holes that exposes the ferrite surface created after molding by molding pins that press together all of the beads to minimize air gap between the beads. JP denotes the joining point of the ferrite beads that air gap may exist.
• Hl, H2, H3, H4, H5 to HN-I are N-I holes multiply by two. This is due to Hl has two holes located diagonally on the circumference of the encapsulation material, similarly H2, H3, H4, H5 until HN-I.
• Fig. 4 illustrates ferrite beads core encapsulated by shrinkable tube (ST).
• FN being N number of ferrite beads whereby first and FN piece of ferrite beads are exposed at two ends.
• Fig. 5 illustrates 2 half bobbin encapsulating the ferrite beads core with epoxy E3 bonding the half bobbin to al of the ferrite beads core and epoxy E4 bonding the two ends of the half bobbins.
• Fig. 6 illustrate full bobbin encapsulating the ferrite beads core with epoxy E5 to bond the bobbin to the cores.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Manufacturing & Machinery (AREA)
• Coils Or Transformers For Communication (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=41136043

Family Applications (1)

Country Status (1)

Cited By (7)

• 2008
  • 2008-04-01 WO PCT/MY2008/000022 patent/WO2009123432A2/fr active Application Filing

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