WO1990008421A1 - Vibrator - Google Patents
Vibrator Download PDFInfo
- Publication number
- WO1990008421A1 WO1990008421A1 PCT/US1989/005223 US8905223W WO9008421A1 WO 1990008421 A1 WO1990008421 A1 WO 1990008421A1 US 8905223 W US8905223 W US 8905223W WO 9008421 A1 WO9008421 A1 WO 9008421A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vibrator
- magnetic
- approximately
- vibrator according
- suspension means
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
Definitions
- This invention relates to vibrators and particularly, though not exclusively, to vibrators for use in annunciators.
- vibratory annunciators are known, for example, in paging receivers, where they may be be used to announce the receipt of a page to the wearer of the receiver.
- a typical such paging receiver employs a vibrator having a magnetic mass located at one end of an arm whose other end is fixed.
- a cantilevered system has a natural frequency of oscillation dependent on the mass and on the stiffness and length of the arm.
- An electromagnet formed by a coil winding driven by an alternating current (step, ramp or sine) acts on the magnet, causing the system to vibrate.
- the vibration frequency is chosen to be close to the natural oscillation frequency so as to produce an oscillation of large amplitude.
- Such vibrators suffer from the disadvantage that the cantilevered arm is subject to considerable mechanical stress, due to the large amplitudes of vibration needed to produce sufficient tactile sensation. Thus, such vibrators are prone to fatigue failure after only relatively short periods of use.
- a vibrator comprising: a massive, magnetic member arranged for movement about a reference position; and electromagnetic actuator means for causing said member to move; and magnetic suspension means arranged on either side of said member"for suspending said member therebetween.
- FIG. 1 shows an exploded perspective view of the vibrator
- FIG. 2 shows a side cross-sectional view of the vibrator residing in an acoustic cavity of a piezoelectric transducer.
- the vibrator 2 includes a flat base plate 4 generally in the form of a 90° circular segment and having a thickness of approximately 0.127 cm and a radius of approximately 1.524 cm. Adjacent the corner of the base plate in which its two straight sides meet, a cylindrical shaft 6 approximately 0_S08 cm long extends from the top surface of the plate perpendicular to the plane of the plate. Adjacent the two arcuate corners of the plate 6 where are located on the plate's top surface two permanent magnets 8, 10 with opposite polarity magnetic faces arcuately facing.
- the magnets 8, 10 are made of samarium cobalt and are of the same size: approximately 0.3175 cm high and of rectangular plan cross-section approximately 0.3175 cm in the radial direction and approximately 0.254 cm in the arcuate direction.
- a wire wound cylindrical coil 12 approximately 0.508 cm long and of approximately 0.254 cm diameter is located approximately in the middle of the top surface of the plate 4, the axis 421
- a rotor arm 14 approximately 1.27 cm long locates at one end via a hole therethrough on the shaft 6 for pivotal motion thereabout.
- a permanent magnet 16 To the end of the rotor arm remote from the shaft 6 is fixed a permanent magnet 16.
- the magnet 16 is made of samarium cobalt and is approximately 0.3175 cm long in the direction of the length of the arm 14 and of rectangular cross-section normal thereto approximately 0.3175 cm high and approximately 0.508 cm wide.
- the rotor arm 14 is mounted on the shaft 6 so that the magnet 16 is near to, but clear of, the top surface of the base plate 4 and is pivotally movable about the axis of the shaft 6 between the magnets 8, 10 in a plane parallel to the plane of the base plate 2.
- the magnet 16 is arranged with its magnetic faces facing the magnetic faces of the magnets 8, 10 such that faces of like polarity are closest. Thus, in its resting position, the magnet 16 on the rotor arm 14 is magnetically suspended between the magnets 8, 10.
- the coil winding 12 is energized with a stepped driving current of approximately 60 mA at approximately 0.9-1.5 volt and having a 50% duty cycle and a frequency of approximately 50-70 Hz.
- the coil When the energizing current is applied to the coil 12, the coil performs as an electromagnet and the resulting oscillating magnetic field acts on the magnet 16 to cause it to pivot first toward one of the magnets 8, 10 and then toward the other, thereby setting up a vibratory oscillation of the magnet 16 between its magnetic suspension magnets 8, 10.
- the restoring forces acting on the magnet 16 are not simply proportional to its displacement from its equilibrium position, but are instead the resultant of the two oppositely directed repulsive forces between the magnet 16 and the suspension magnets 8, 10 21
- the amplitude response of the vibrator of FIG. 1 to excitation over a range of frequencies does not exhibit a sharp peak at its natural frequency of oscillation, as is the case with prior art cantilevered vibrators, but instead exhibits a broader optimal response centered around its natural oscillation frequency.
- Such a broad response allows the vibrator to respond to a range of inputs, for example, pulsed, ramped or varying frequency inputs.
- the vibrator can be made to produce a subjectively optimal tactile sensation or pattern of different sensations as desired.
- the magnet 16 may still be possible for the magnet 16 to impact one of the magnets 8, 10 if, for example, the vibrator is dropped. If such impact were to occur, the magnets could become damaged since the material from which they are made is brittle and so fractures or shatters easily.
- the magnets 8, 10 & 16 may be coated with a layer of cushioning material, e.g. rubber.
- the vibrator 2 may be conveniently positioned in the resonant cavity 18 of a piezoelectric acoustic transducer element 20. In this way, separate, independent, optimized mechanisms for acoustic and tactile output can be provided in less space than the sum of the spaces occupied by each mechanism.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019900702036A KR910700563A (en) | 1989-01-17 | 1989-11-24 | Vibrator |
FI912391A FI912391A0 (en) | 1989-01-17 | 1991-05-16 | VIBRATOR. |
DK911238A DK123891D0 (en) | 1989-01-17 | 1991-06-25 | VIBRATOR |
NO91912633A NO912633L (en) | 1989-01-17 | 1991-07-05 | VIBRATOR. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US297,290 | 1989-01-17 | ||
US07/297,290 US4950931A (en) | 1989-01-17 | 1989-01-17 | Vibrator |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990008421A1 true WO1990008421A1 (en) | 1990-07-26 |
Family
ID=23145678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1989/005223 WO1990008421A1 (en) | 1989-01-17 | 1989-11-24 | Vibrator |
Country Status (9)
Country | Link |
---|---|
US (1) | US4950931A (en) |
EP (1) | EP0454692A4 (en) |
JP (1) | JPH04505091A (en) |
KR (1) | KR910700563A (en) |
CN (1) | CN1046863A (en) |
DK (1) | DK123891D0 (en) |
FI (1) | FI912391A0 (en) |
MY (1) | MY104279A (en) |
WO (1) | WO1990008421A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0467071A2 (en) * | 1990-07-19 | 1992-01-22 | Telenorma Gmbh | Calling device for telecommunication terminals |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4037994C1 (en) * | 1990-11-29 | 1992-03-05 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De | |
US5347186A (en) * | 1992-05-26 | 1994-09-13 | Mcq Associates, Inc. | Linear motion electric power generator |
JP2736023B2 (en) * | 1994-12-27 | 1998-04-02 | ユニデン株式会社 | Vibrator mounting structure, vibrator mounting holder, and vibrator mounting method |
US5717266A (en) * | 1996-03-11 | 1998-02-10 | The Penn State Research Foundation | High power oscillatory drive |
AU2179297A (en) * | 1996-04-08 | 1997-10-29 | Delta Tooling Co., Ltd. | Magnetic spring having damping characteristics and vibration mechanism having same |
JP3725272B2 (en) * | 1996-12-27 | 2005-12-07 | 株式会社デルタツーリング | Vibration generation mechanism |
JPH1130274A (en) * | 1997-05-15 | 1999-02-02 | Delta Tsuuring:Kk | Vibrational mechanism with magnetic spring |
KR100281474B1 (en) | 1997-05-16 | 2001-02-01 | 후지타 히토시 | Energy extracting mechanism having a magnetic spring |
US6166465A (en) * | 1998-04-30 | 2000-12-26 | Delta Tooling Co., Ltd. | Vibration generating mechanism using repulsive forces of permanent magnets |
US5945772A (en) * | 1998-05-29 | 1999-08-31 | Motorla, Inc. | Damped resonant piezoelectric alerting device |
TWM282416U (en) * | 2005-03-08 | 2005-12-01 | Chuan-Sheng Chen | Vibrating power generator |
US7345372B2 (en) * | 2006-03-08 | 2008-03-18 | Perpetuum Ltd. | Electromechanical generator for, and method of, converting mechanical vibrational energy into electrical energy |
CZ2007331A3 (en) * | 2007-05-09 | 2008-12-29 | Vysoké ucení technické Brno | Electromagnetic vibratory generator for low frequencies of vibrations |
US20090322164A1 (en) * | 2008-06-27 | 2009-12-31 | Gary Dennis Porter | Vibrating method for generating direct current electricity |
KR20120068801A (en) * | 2012-05-29 | 2012-06-27 | 나향옥 | Impactive vibration generator and applied apparatus thereof |
CN107971199A (en) * | 2016-10-25 | 2018-05-01 | 钟志刚 | Phased electromagnetic oriented vibration device |
US11711005B2 (en) | 2020-05-12 | 2023-07-25 | Richard L Lewis | Vibration-based electric generation device |
US11796022B1 (en) * | 2022-07-14 | 2023-10-24 | Ehoma Industrial Corporation | Magnetic levitation buffer device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090112A (en) * | 1976-08-23 | 1978-05-16 | General Scanning, Inc. | Electrically damped oscillation motor |
JPS5771168A (en) * | 1980-10-22 | 1982-05-01 | Hitachi Ltd | Semiconductor integrated circuit device |
US4533891A (en) * | 1983-04-07 | 1985-08-06 | Pneumo Corporation | Limited angle torque motor |
US4712037A (en) * | 1985-07-03 | 1987-12-08 | Nederlandse Centrale Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek | Resonant piezoelectric sensor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1906861A1 (en) * | 1969-02-12 | 1971-01-07 | Forschungslaboratorium Dr Ing | Vibration modulator with magnetic spring |
BE888229A (en) * | 1981-04-01 | 1981-10-01 | Prvni Brnenska Strojirna | INDUCTIVE TRANSDUCER. |
-
1989
- 1989-01-17 US US07/297,290 patent/US4950931A/en not_active Expired - Fee Related
- 1989-11-24 KR KR1019900702036A patent/KR910700563A/en not_active Application Discontinuation
- 1989-11-24 JP JP2501272A patent/JPH04505091A/en active Pending
- 1989-11-24 EP EP19900901211 patent/EP0454692A4/en not_active Withdrawn
- 1989-11-24 WO PCT/US1989/005223 patent/WO1990008421A1/en not_active Application Discontinuation
- 1989-11-30 MY MYPI89001669A patent/MY104279A/en unknown
-
1990
- 1990-01-15 CN CN90100188A patent/CN1046863A/en active Pending
-
1991
- 1991-05-16 FI FI912391A patent/FI912391A0/en unknown
- 1991-06-25 DK DK911238A patent/DK123891D0/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090112A (en) * | 1976-08-23 | 1978-05-16 | General Scanning, Inc. | Electrically damped oscillation motor |
JPS5771168A (en) * | 1980-10-22 | 1982-05-01 | Hitachi Ltd | Semiconductor integrated circuit device |
US4533891A (en) * | 1983-04-07 | 1985-08-06 | Pneumo Corporation | Limited angle torque motor |
US4712037A (en) * | 1985-07-03 | 1987-12-08 | Nederlandse Centrale Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek | Resonant piezoelectric sensor |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0467071A2 (en) * | 1990-07-19 | 1992-01-22 | Telenorma Gmbh | Calling device for telecommunication terminals |
EP0467071A3 (en) * | 1990-07-19 | 1992-12-09 | Telenorma Gmbh | Calling device for telecommunication terminals |
Also Published As
Publication number | Publication date |
---|---|
EP0454692A1 (en) | 1991-11-06 |
US4950931A (en) | 1990-08-21 |
FI912391A0 (en) | 1991-05-16 |
JPH04505091A (en) | 1992-09-03 |
KR910700563A (en) | 1991-03-15 |
MY104279A (en) | 1994-02-28 |
CN1046863A (en) | 1990-11-14 |
DK123891A (en) | 1991-06-25 |
DK123891D0 (en) | 1991-06-25 |
EP0454692A4 (en) | 1991-12-18 |
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