US3830099A - Electromagnetic vibrator having means for changing direction of vibrations - Google Patents

Electromagnetic vibrator having means for changing direction of vibrations Download PDF

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Publication number
US3830099A
US3830099A US00330680A US33068073A US3830099A US 3830099 A US3830099 A US 3830099A US 00330680 A US00330680 A US 00330680A US 33068073 A US33068073 A US 33068073A US 3830099 A US3830099 A US 3830099A
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United States
Prior art keywords
magnets
drive coil
electromagnetic vibrator
vibrating table
vibration
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Expired - Lifetime
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US00330680A
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English (en)
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A Ichikawa
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INT MECHANICAL VIBRATION LABOR
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INT MECHANICAL VIBRATION LABOR
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/04—Monodirectional test stands
    • 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

Definitions

  • ABSTRACT An electromagnetic vibrator having spaced apart magnets mounted on an axis, and a drive coil interposed between the magnets, the drive coil being vibrated by energization thereof by an A-C current.
  • the magnets are rotatable about an axis so as to change the direction of vibration of the drive coil.
  • a set of rollers engaging respective generally L-shaped guide plates, the guide plates being coupled to the coil via aplate member, is provided so as to additionally change the direction of vibration of the drive coil; To change the direction of vibration, the rollers are selectively engageable with perpendicular surfaces of the generally L-shaped guide plates.
  • Prior art electromagnetic vibrators for carrying out the above vibration tests are capable of producing vibrations of the test body only in one direction. Therefore, vertical and horizontal vibration tests generally had to be done by separately using a vertical vibrator and a horizontal vibrator.
  • the invention comprises an electromagnetic vibrator, which includes two magnets symmetrically arranged with respect to the same axis and spaced from 'each other along the axis such that a pole of one polarity of one magnet faces the opposite polarity pole of the other magnet, the magnets being capable of rotation about the axis.
  • a coil is interposed between the two magnets and traverses the magnetic path defined between the two magnets, the coil being wound into a ring-like form along the direction of rotation of the magnets.
  • the electromagnetic vibrator according to the invention while it utilizes the same basic principles as does the usual electromagnetic vibrator, is so constructed as to permit varying the direction of the magnetic path defined by the magnets by rotating them, to thereby obtain vibration in any desired direction.
  • FIGS. 1A and 1B show a conventional two directional vibrator, FIG. 1A being a section along line lA-lA in FIG. 1B, and FIG. 1B being a side elevational view;
  • FIGS. 2A and 2B show an electromagnetic vibrator according to the present invention for use as a vertical vibrator, FIG. 2A being a section taken along line 2A2A in FIG. 2B, and FIG. 2B being a section taken along line 2B2B in FIG. 2A;
  • FIG. 3 is a view similar to FIG. 2A but showing the same vibrator for use as a horizontalvibrator;
  • FIG. 4 is a front elevational enlarged view illustrating the roller mechanism of the present invention.
  • FIG. 5 is a bottom plan view, partly in section, of the mechanism of FIG. 4.
  • FIG. 1A there is shown a prior art electromagnetic vibrator l, which is supported on each side via a trunnion 2 on respective support pillars 3 and which is capable of rotation about the trunnions 2.
  • the vibrator comprises a drive coil 6v and a magnet 7 forming a magnetic circuit to drive the vibrator.
  • a vertical vibrating table 4 on the vibrator l is mounted a vertical vibrating table 4, and on one side is disposed a horizontal vibrating table 5.
  • the vibrator body 1 For carrying out vertical vibration testing with. the apparatus of FIGS. 1A and 1B, the vibrator body 1 is held vertical, and the vertical vibrating table 4 is mounted thereon, as shown in FIG. 1B.
  • the test body (not shown) is then mounted on the vertical vibrating table 4, and then the drive coil 6 is energized to cause vertical vibrations.
  • the vibrator body 1 For horizontal vibration testing, the vibrator body 1 is rotated about the trunnions 2 into its horizontal position, and held horizontal. Then, the horizontal vibrating table 5 is coupled on the vibrator 1..
  • test body (not shown) is mounted on the horizontal vibrating table 5, and then the drive coil 6 is energized to cause horizontal vibrations.
  • FIGS. 2 and 3 show an electromagnetic vibrator according to the present invention.
  • FIGS. 2A and 2B show the vibrator in the case in which it is used for a vertical vibrating test, and FIG. 3 shows the same for a horizontal vibrating test.
  • a stationary frame 8 supports a support shaft plate member 13 secured at its top to a vibrating table 12.
  • the plate member 13 is formed with a central opening or aperture of a considerably greater diameter than the diameter of the shaft 9 which passes therethrough, and it is provided on its both sides with a drive coil 14 which is wound along the direction of rotation of the permanent magnets 10, as is clearly shown in FIGS. 2A and 3.
  • the vibrating table 12 is supported via an air spring means 15 on the stationary frame 8 by means, for example, of angles 17 secured to frame 8. Other suitable supports can be used.
  • Guide rollers 16 are provided and are ganged together such that they can be alternatively supported either in their position shown in FIG. 2A or in their position shown in FIG. 3.
  • Generally L-shaped guide plates 17 are secured to the plate member 13. The plate member 13 is guided such that it can reciprocate only in the vertical direction when the guide rollers 16 are in the position shown in FIG. 2A, while it is guided such that it can reciprocate only in the horizontal direction when the guide rollers 16 are in the position shown in FIG. 3.
  • FIGS. 4 and 5 are enlarged views of one roller 16 and the mechanism for moving the roller 16 in relation to the L-shaped guide plates 17. It is to be understood that the other three rollers and roller moving mechanism are the same or similar to that illustrated in FIGS. 4 and 5.
  • a guide roller 16 is rotatably mounted to a lever 18, the guide roller preferably being mounted by means of a ball bearing mechanism 22.
  • the lever 18 is pivotally mounted to the frame 8 by means of a pin 19 which is fixed to the frame 8 by means, for example, of screws 23 and mounting block 24.
  • An operating handle is provided at the end of lever 18 for pivoting the lever 18 about the pin 19 so as to change the position of roller 16 relative to the L- shaped guide plate 17.
  • Operating handle 20 for each of the guide rollers may be appropriately ganged together, as desired, so as to provide simultaneous movement of the rollers.
  • the guide plate 17 and vibrating table 12 can vibrate (or reciprocate) only in the vertical direction.
  • the guide plate 17 and the vibrating table 12 can vibrate (or reciprocate) only in the horizontal direction.
  • the operating handles and levers 18 for each of the rollers 16 may be ganged together.
  • the ganging mechanism may merely be a mechanical linkage which has not been shown so as to not duly obscure the inventive concept.
  • the handles 20 for the individual rollers 16 may be individually operable, either by hand or by means of additional operating linkages (not shown), as desired.
  • Vibration of the vibrating table 12 can be brought about by passing A-C current at a frequency f through the drive coil 14. Because the drive coil 14 is disposed to traverse the magnetic path formed by the C-shaped permanent magnets 10, by passing A-C current at frequency f through drive coil 14 there is produced a vibromotive force F proportional to the product of the field and current in the coil 14, which force F is given as F BlI where F is the force (in kilograms), B is the flux density (in gauss), l is the coil length (in centimeters) and I is the coil current (in amperes).
  • the force F generated by the drive coil 14 in the above manner is transmitted through the plate member 13 to the vibrating table 12 to cause vibration of a test body (not shown) mounted on the vibrating table 12.
  • the vibrating table 12 is mounted to the frame 8 by means of the air spring 15 and angle members 21. This mounting techniquie is used even when the table is vibrated in the horizontal direction. In this case, therefore, the load on the guide rollers 16 is reduced.
  • the rotation of the permanent magnets 10 relative to the table can be simply achieved by rotating the lever 11 which is connected to shaft 9. Furthermore, vibrations not only in the vertical and horizontal directions but also in any other desired direction can be obtained by appropriately arranging the permanent magnets 10 and guide rollers 16 at a desired position, such as a position intermediate their two end positions.
  • the drive coil 14 may be provided only on one side of the plate member 13.
  • the permanent magnets 10 may be replaced with electromagnets, and different supports can be used in place of air springs 15.
  • An electromagnetic vibrator providing a vibrating force through energization of a drive coil disposed in a magnetic circuit with A-C current, said vibrator comprising:
  • a drive coil interposed between said two magnets and traversing a magnetic path between said magnets and being vibrated upon energization thereof by said A-C current, said drive coil being wound into a ring-like form along the direction of rotation of said magnets.
  • the electromagnetic vibrator according to claim 1 further comprising a stationary frame accommodating said magnets and said drive coil; a vibrating table supported on said stationary frame so as to be capable of vibration with respect to said stationary frame; and a shaft constituting said axis extending through the opening of said ring-like drive coil and rotatably mounted at opposite ends in said stationary frame, said magnets being each symmetrically secured to said shaft, and said drive coil being carried by said vibrating table.
  • the electromagnetic vibrator according to claim 2 including air spring means supporting said vibrating table on said stationary frame.
  • the electromagnetic vibrator according to claim 2 further including a plate member interposed between said two magnets and secured at one end to said vibrating table, said plate member being formed with a central opening or aperture of a diameter greater than the diameter of said shaft, said shaft extending through said opening, said drive coil being disposed at at least one side of said plate member and secured thereto.
  • said drive coil is comprised of two coils, each of which is secured to opposite sides of said plate member.
  • the electromagnetic vibrator according to claim 4 further comprising generally L-shaped guide plates coupled to said plate member adjacent the corners thereof, and guide rollers extending in contact with respective L-shaped guide plates; means for shifting the positions of said guide rollers relative to said respective L-shaped guide plates and relative to said stationary frame, the direction of vibration of said vibrating table being determined by the positions of said guide rollers relative to said respective L-shaped guide plates.
  • the electromagnetic vibrator according to claim 6 including air spring means supporting said vibrating table on said stationary frame.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US00330680A 1972-03-02 1973-02-08 Electromagnetic vibrator having means for changing direction of vibrations Expired - Lifetime US3830099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972025121U JPS5241186Y2 (enrdf_load_stackoverflow) 1972-03-02 1972-03-02

Publications (1)

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US3830099A true US3830099A (en) 1974-08-20

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US00330680A Expired - Lifetime US3830099A (en) 1972-03-02 1973-02-08 Electromagnetic vibrator having means for changing direction of vibrations

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US (1) US3830099A (enrdf_load_stackoverflow)
JP (1) JPS5241186Y2 (enrdf_load_stackoverflow)
DE (1) DE2247812A1 (enrdf_load_stackoverflow)
FR (1) FR2152338A5 (enrdf_load_stackoverflow)
GB (1) GB1410180A (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339241A (en) * 1979-10-16 1982-07-13 Stoecker Winfried A Apparatus and method for simultaneously mixing specimens for performing microanalyses
US4498343A (en) * 1982-03-23 1985-02-12 Kimball David V Method and apparatus for two-axis screening vibration
US4963804A (en) * 1989-07-10 1990-10-16 Westinghouse Electric Corp. Apparatus and method for reducing vibration of rotating machinery
US5081870A (en) * 1990-04-12 1992-01-21 Fitzgerald Edwin R Method and apparatus for determining dynamic mechanical properties of materials
US5145640A (en) * 1989-04-04 1992-09-08 Levin Igor A Method for acceleration of liquid and bulk materials and apparatus for realization thereof
US5493511A (en) * 1992-12-08 1996-02-20 Administrator, National Aeronautics And Space Administration High speed thin plate fatigue crack monitor
FR2784523A1 (fr) * 1998-10-13 2000-04-14 Bernard Saumon Moteur/groupe electro-magnetique a aimants permanents
US20040169425A1 (en) * 2003-02-28 2004-09-02 Citizen Electronics., Co. Ltd. Vibrator and method for manufacturing the same
US20050180258A1 (en) * 2004-02-17 2005-08-18 Advanced Analytical Technologies, Inc. Vortexer
US20060094990A1 (en) * 2004-10-29 2006-05-04 Kim Seong B Vibratory apparatus of exercise
US20070013247A1 (en) * 2005-07-13 2007-01-18 Chao-Nien Tung Cooling fan with damping structure supporting a shaft of the cooling fan
US20090025810A1 (en) * 2007-07-27 2009-01-29 Wo Andrew M Micro-vortex generator
EP2143409A1 (en) 2008-07-10 2010-01-13 Leao Wang Electromagnetic vibrating mechanism
US20120174679A1 (en) * 2011-01-07 2012-07-12 Hon Hai Precision Industry Co., Ltd. Vibration testing device
US8608403B2 (en) 2012-03-28 2013-12-17 Caterpillar Paving Products Inc. Magnetic vibratory compactor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884954A (en) * 1981-01-30 1989-12-05 Niekerk Johannes W Van Twin coil apparatus and energizing structure therefor
DE3601182A1 (de) * 1986-01-17 1987-07-23 Peter Pohl Gmbh Dipl Ing Ruetteltisch
DE102006031223B3 (de) * 2006-06-30 2008-02-07 AJ Cybertron Gesellschaft für Laborautomationssysteme mbH Schütteleinrichtung und Verfahren zum Homogenisieren und/oder Aufschließen von Proben
CN105921392B (zh) * 2016-06-14 2018-11-16 上海交通大学 共轭等径凸轮型复合磁能往复摆振动台及驱动部件与方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2316253A (en) * 1937-07-17 1943-04-13 Keinath George Method and means for testing materials

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2316253A (en) * 1937-07-17 1943-04-13 Keinath George Method and means for testing materials

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339241A (en) * 1979-10-16 1982-07-13 Stoecker Winfried A Apparatus and method for simultaneously mixing specimens for performing microanalyses
US4498343A (en) * 1982-03-23 1985-02-12 Kimball David V Method and apparatus for two-axis screening vibration
US5145640A (en) * 1989-04-04 1992-09-08 Levin Igor A Method for acceleration of liquid and bulk materials and apparatus for realization thereof
US4963804A (en) * 1989-07-10 1990-10-16 Westinghouse Electric Corp. Apparatus and method for reducing vibration of rotating machinery
US5081870A (en) * 1990-04-12 1992-01-21 Fitzgerald Edwin R Method and apparatus for determining dynamic mechanical properties of materials
US5493511A (en) * 1992-12-08 1996-02-20 Administrator, National Aeronautics And Space Administration High speed thin plate fatigue crack monitor
FR2784523A1 (fr) * 1998-10-13 2000-04-14 Bernard Saumon Moteur/groupe electro-magnetique a aimants permanents
US7245049B2 (en) * 2003-02-28 2007-07-17 Citizen Electronics Co., Ltd. Vibrator and method for manufacturing the same
US20040169425A1 (en) * 2003-02-28 2004-09-02 Citizen Electronics., Co. Ltd. Vibrator and method for manufacturing the same
US20050180258A1 (en) * 2004-02-17 2005-08-18 Advanced Analytical Technologies, Inc. Vortexer
US7296924B2 (en) * 2004-02-17 2007-11-20 Advanced Analytical Technologies, Inc. Vortexer
US7141029B2 (en) * 2004-10-29 2006-11-28 Seong Bae Kim Vibratory apparatus of exercise
US20060094990A1 (en) * 2004-10-29 2006-05-04 Kim Seong B Vibratory apparatus of exercise
USRE44360E1 (en) 2004-10-29 2013-07-09 Seong Bae Kim Vibratory apparatus of exercise
US20070013247A1 (en) * 2005-07-13 2007-01-18 Chao-Nien Tung Cooling fan with damping structure supporting a shaft of the cooling fan
US20090025810A1 (en) * 2007-07-27 2009-01-29 Wo Andrew M Micro-vortex generator
EP2143409A1 (en) 2008-07-10 2010-01-13 Leao Wang Electromagnetic vibrating mechanism
US20120174679A1 (en) * 2011-01-07 2012-07-12 Hon Hai Precision Industry Co., Ltd. Vibration testing device
US8544332B2 (en) * 2011-01-07 2013-10-01 Hon Hai Precision Industry Co., Ltd. Vibration testing device
US8608403B2 (en) 2012-03-28 2013-12-17 Caterpillar Paving Products Inc. Magnetic vibratory compactor

Also Published As

Publication number Publication date
JPS48101271U (enrdf_load_stackoverflow) 1973-11-28
DE2247812A1 (de) 1973-09-06
JPS5241186Y2 (enrdf_load_stackoverflow) 1977-09-17
GB1410180A (en) 1975-10-29
FR2152338A5 (enrdf_load_stackoverflow) 1973-04-20

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