US1876113A - Magnet system for converting electric oscillations into acoustic ones or conversely - Google Patents

Magnet system for converting electric oscillations into acoustic ones or conversely Download PDF

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Publication number
US1876113A
US1876113A US298827A US29882728A US1876113A US 1876113 A US1876113 A US 1876113A US 298827 A US298827 A US 298827A US 29882728 A US29882728 A US 29882728A US 1876113 A US1876113 A US 1876113A
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United States
Prior art keywords
pole piece
armature
pole
magnet
shaped
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Expired - Lifetime
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US298827A
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English (en)
Inventor
Vermeulen Roelof
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RCA Corp
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RCA Corp
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Publication of US1876113A publication Critical patent/US1876113A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type

Definitions

  • This invention relates to a magnet system for converting electric oscillations into acoustic oscillations and conversely. More particularly it relates to a magnet system provided with a ferromagnetic armature which is normally balanced in a permanent magnetic field and which is adapted to move from that-balanced position when speech modulated currents are passed thru windings associated with said system.
  • the invention has for its object to provide a magnet system of the kind referred to which has a very simple construction and which can be cheaply and easily made. Another object is to provide a path of minimum resistance for the alternating flux developed manent magnet through the armature to polesurfaces of a U- or V-shaped pole piece at-- by the speech modulated currents.
  • the magnet system according to the invention isso constructed that the permanent flux is branched off from one pole, of a pertached to the other pole of the permanent magnet.
  • the active faces of the U shaped pole piece are normal-to the direction of movement. of the armature, and said pole.
  • this part will be similar to a transformer core and con seouently will constitute an ideal path for the induced alternating current.
  • the active pole faces of the U-shaped pole piece being normal to the direction of movement of the armature, air gaps will be produced between the ends of the armature and the active faces of the Owing to this arrangement a variation in the magnetic field willex'ercise a greater force on the armature than in the case where the air gap is parallel to the direction of movement of the armature.
  • the U- or veshaped pole piece has arranged opposite it another pole piece to, whichthe armature is secured by means of unilaterally clamped springs.
  • the two'pole-pieces may be located essentially in one plane and for convenience can be mounted on a copper plate which is provided with notches adapted to receive the limbs of the magnet.
  • the construction of the magnet system is very simple as it is built up of but four parts. In the first place the horse-shoe magnet which in the majority of cases is permanent but may be provided with direct current windings,- secondly the U shaped pole piece with two coils.
  • Figure 1 is a side view of a magnet system system jress of the permanent and the alternating Before entering into the details ofthe magnet system the principle onwhich it is based will be briefly ex lained with reference to Figure 6.
  • 1 designates a permanent magnet.
  • This'horse-shoe magnet has secured to one pole a pole piece 2 and to the other pole a U-shaped pole piece 3.
  • Speech modulated current coils 9 and 10 are mounted on the limbs of the U-shaped pole piece 3.
  • the ferromagnetic armature 5 is secured to the pole piece-2 by means of springs 12 and 13. Y
  • the pole faces of the pole piece are hereinafter understood to mean those parts of the pole piece thattogether with the armature limit the intermediate air gap.
  • the limbs of the U-shaped pole piece are provided with speech modulated current coils and if the latter are wound in a correct direction an alternating fiux will be produced which makes its way through the armature and the U-shaped pole piece as indicated by dotted lines. From this it follows that this alternating flux traverses a closed circuit constituted by pole piece 3 and armature 5. When these two parts are laminated the resistance for the alternating flux becomes extremely low so that the flux reaches a high value.
  • FIG 1 a side view of the magnet system is shown.
  • the U-shaped magnet 1 has mounted on it a copper plate 7 which serves as a mounting plate for pole piece 2 and U- shaped pole piece 3.
  • pole piece 3 is secured to the copper plate 7 by means of clamps 8 and that two coils 9 and 10 are mounted on the limbs of the pole piece.
  • Pole piece 2 is fastened to the copper plate 7 by means of screws 11.
  • This pole piece has mounted on its springs 12 and 13 which serve as carriers for the armature 5.
  • a stud 14 which communicates with an oscillation member, for example a cone, is fastened to the armature 5.
  • Figure 3 shows a bottom view of the copper plate.
  • Figures4 and 5 show in detail the pole pieces 3 and2.
  • armature 5 is secured to the pole piece .2 by means of springs 12 and 13. These springs are unilaterally clamped by means of screws and are secured to the pole'piece 2.
  • Pole piece 3 and armature 5 are laminated so that the alternating flux meets with a low resistance.
  • a permanent magnet a U-shaped pole piece fastened to one of the poles of said magnet, an armature positioned with one end adjacent one of the limbs of said U-shaped pole piece and with its other end adjacent the other limb of said U-shaped pole piece, a single limb ole piece'fastened to the other pole of said magnet, said pole piece being positioned with its single limb adjacent the intermediate part of said armature, an operating member connected to said armature, a pair of coils mounted on the limbs of said pole piece, and means supporting said armature for movement along its longitudinal axis.
  • a permanent magnet a U-shaped pole piece fastened to one of the poles of said magnet, an armature positioned with one end adjacent one of the limbs of said U-shaped pole pieceand with its other end adjacent the other limb of said U-shaped pole piece, a driving rod connected tosaid' armature, a pair of supporting springs se cured to the ends of said armature, win surrounding the limbs of said U-shaped po e piece whereby said armature lies within its magnetic field, and a pole piece fastened to the other pole of said magnet and positioned adjacent the side of said armature, said last mentioned pole piece and said armature being arranged so that the air gap between said pole piece and the side of said armature is not varied by vibration of the armature.
  • a magnet system for the interconverw a piece and a second pole piece having one sion of electric oscillations and sound waves comprising means including a U-shaped 1pol ⁇ ? for forming a permanent magnetic field, said U-shaped pole piece being arranged oppo-- site said second pole piece, a ferromagnetic armature arranged in said ma and adapted to move substantial along its longitudinal axis, said armature ein positioned with one end adjacent one of t e pole surfaces of said U-shaped pole piece and with'the other end adjacent the other pole "surface of said U-sha ed pole piece whereby of the magnet.
  • the permanent flux is ranched ofi'from said second pole piece throu h the armature to v the pole surfaces of said which are normal to the direction of move ment of the armature, said U-shaped pole piece constituting with said armature a closed circuit for alternating flux, coils for the speech modulated current mounted on the U-shaped pole piece to produce said al ternating flux, and springs clamped to said second pole piece and secured to the ends of said armature for supporting said armature.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US298827A 1927-09-24 1928-08-10 Magnet system for converting electric oscillations into acoustic ones or conversely Expired - Lifetime US1876113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1876113X 1927-09-24

Publications (1)

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US1876113A true US1876113A (en) 1932-09-06

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ID=19873228

Family Applications (1)

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US298827A Expired - Lifetime US1876113A (en) 1927-09-24 1928-08-10 Magnet system for converting electric oscillations into acoustic ones or conversely

Country Status (4)

Country Link
US (1) US1876113A (he)
BE (1) BE353518A (he)
FR (1) FR659415A (he)
NL (1) NL25009C (he)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3552564A (en) * 1967-04-25 1971-01-05 Burgener Technical Enterprises Ferromagnetic ore concentrator and method of processing ores therewith

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3552564A (en) * 1967-04-25 1971-01-05 Burgener Technical Enterprises Ferromagnetic ore concentrator and method of processing ores therewith

Also Published As

Publication number Publication date
FR659415A (fr) 1929-06-28
BE353518A (he)
NL25009C (he)

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