WO1990007821A1 - Procede et dispositif destines a etre utilises dans un moteur - Google Patents

Procede et dispositif destines a etre utilises dans un moteur Download PDF

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Publication number
WO1990007821A1
WO1990007821A1 PCT/SE1989/000748 SE8900748W WO9007821A1 WO 1990007821 A1 WO1990007821 A1 WO 1990007821A1 SE 8900748 W SE8900748 W SE 8900748W WO 9007821 A1 WO9007821 A1 WO 9007821A1
Authority
WO
WIPO (PCT)
Prior art keywords
coils
current
magnetic field
rod
controlled
Prior art date
Application number
PCT/SE1989/000748
Other languages
English (en)
Inventor
Carl Tyrén
Fredy Olsson
Lothar Erik Kiesewetter
Original Assignee
Jacobsson Industrier I Stockholm Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jacobsson Industrier I Stockholm Ab filed Critical Jacobsson Industrier I Stockholm Ab
Publication of WO1990007821A1 publication Critical patent/WO1990007821A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/021—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors using intermittent driving, e.g. step motors, piezoleg motors
    • H02N2/023—Inchworm motors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N35/00—Magnetostrictive devices

Definitions

  • the invention relates to a method for causing a first body having magnetos rictive properties and a second body, against which said first body is in bearing contact with a certain grip between the contact surfaces, to move with respect to each other while substantially maintaining said grip, wherein a magnetic field profile having a strength variating in the longitudinal direction of the body is generated in a longitudinal section in said first body and is caused to move along the same line as said first body is moved along, with respect to said second body, and a device for carrying out the method.
  • the international application PCT/SE88/00010 dis ⁇ closes a method and a device, which are based on the fact that magnetostrictive materials change their geometrical dimensions under influence of a magnetic field.
  • a rod of magnetos rictive material of a certain composition will thus be increased in length under influence of a magnetic field while at the same time the transversed dimensions of the rod are decreased.
  • a cylindrical rod of a magnetostrictive material of the kind which undergoes a simultaneous change in length and transversal contraction under influence of a magnetic field is by means of shrinking disposed within a cylindrical tube, preferably made of a non-magnetic material, so as to clamp the magnetostrictive rod within the tube with a certain clamping grip.
  • each magnetic coil is dimensioned so as to generate a magnetic field influencing only a partial section of the magnetostrictive rod.
  • Each of the coils is dimensioned in such a way that the mgnetic field generated by the coil influences one longitudinal section of the magnetostrictive rod only. The dimensioning is made also in such a way that the magnetic field generated when current is supplied to the coil causes an increase in length of the section being influenced, said section simultaneously undergoing a transversed contraction of such a magnitude that the clamping grip against the tube decreases considerably and preferably is eliminated.
  • An object of the present invention is to provide a method according to which the above-mentioned problem is substantially overcome, and a device for carrying out the method.
  • Another object of the invention is to provide a method and a device according to which an accurate control of the magnetic field generated in the rod is made possible in dependence of actual operating conditions. Said objects and other objectcts of the invention are accomplished by means of a method and a device, the charac ⁇ teristics thereof apprearing in the accompanying claims.
  • FIG. 1 diagramatically shows a device for carrying out the method according to the invention, comprising a magnetostrictive rod clamped within a tubelike body,
  • FIG.1A is a shaft showing the states of control signals generated to carry out the method according to the invention
  • FIG. 2 is a longitudinal sectional view of an alternative embodiment of the device according to the invention.
  • FIG. 3 is a wiring diagram of an electric control circuit included in the device according to the invention
  • FIG. 4 is a diagramatic longitudinal sectional view of an alternative embodiment of the device according to the invention.
  • the device comprises a rod 10 of magnetostrictive material surrounded by a cylindrical hollow body 11.
  • a number of coils 12, 12A-12I are winded, each of said coils separately being connected to a power supply unit (see FIG. 3).
  • the coils are separated by a number of annular soft iron disks 13, which function as flow conductors for the magnetic field generated by the coils.
  • a tube 14 made of soft iron bear against the peripheral surfaces of the soft iron disks. Also other materials with good magnetic field conducting properties can be used.
  • the dashed line 15 defines the starting position of the rod 10, before any current is supplied to the coils.
  • the next step for accomplishing a desired movement of the rod 10 is to decrease the current to the coil 12A while approximately at the same time the current to the coil 12, which is a coil most adjacent to the previously innermost coil 12D, is increased.
  • the new state is indicated also in the second line of FIG. LA.
  • Dash and dot line 17 indicate the contour of the rod when the rod is exposed for a magnetic field generated by the coils 12B-12E.
  • the section of the rod 10 undergoing contraction in the transverse direction has thus been moved along the hollow body a distance substantially corresponding to the height of a coil.
  • the rod remains in the projected position indicated by line 16 in FIG. 1.
  • the method is then repeated firstly until all coils have been supplied with current and secondly from the beginning, whereby the magnetostrictive rod is caused to move the desired distance within the hollow body. If the strength of the respective magnetic field is adjusted in such a way that the longitudinal section being influenced is released from contact with the inside of the tube the movement of the magnetostrictive rod takes place without any slip resistance.
  • FIG. 2 comprises a hollow body 20 of magnetostrictive material, which is surrounded by an outer cylindrical hollow body 20, and in this case the coils 18 are winded on a bobbin 21 enclosed in the hollow body 11. From the figure it is clear that in this embodiment an annular portion of the hollow body 20 under ⁇ goes contraction when the coils 19 are supplied with electric current and generate a local magnetic field in the hollow body 20. In other aspects this embodiment corre- sponds to the embodiment previously described in connection with FIG. 1. The major advantage with this embodiment is that the outer hollow body protects other components, e.g. the coil, very well.
  • the circuit diagram shown in FIG. 3 relates to an embodiment of a control circuit for the control of supply of current to the coils generating the magnetic fields required to accomplish the desired movement.
  • the control circuit comprises an oscillator 23, the output thereof constituting in form of pulses a time base for the control circuit.
  • the output is supplied to a counter 24 which is increased one step for each pulse.
  • the counter has a number of output terminals, that are connected to a memory circuit 25.
  • the present value of the counter can be read at said output terminals. Said value is an address to a position in the memory circuit 25, at which a control signal corre- sponding to the control pulses according to FIG. 1A is stored.
  • the control signal is supplied to gate terminals of a number of MOSFET driving transistors 28 through a buffer circuit 26 and a protection circuit 27.
  • Each of said driving transistors 28 is in a conventional manner loaded by a coil 12 and a diode 29 connected in backward direction in parallel with said coil. It is possible to connect a computer in section A-A, said computer in that case supply ⁇ ing componements on the right side of the section A-A with control signals.
  • the computer makes possible a control of the supply of current to the coils which is considerably more complex.
  • the number of coils being supplied with current at any moment is readily modified also during operation.
  • a measuring transistor 30 can also be included in the load circuit of the driving transistor. By means of such a measuring transistor different operational conditions, such as the value and phase shift in relation to the voltage over the load of the load current, can be recorded and by means of a feedback influence the control of the supply of current.
  • circuits providing a more accurate control of the current supply to the coils.
  • the current can e.g. be supplied in a pulse width modulated form by means of a modulator circuit.
  • FIG. 4 shows a somewhat modified embodiment of the method according to the invention.
  • the device shown thereon correspond to the device of FIG. 1 and comprises a rod 10 of magnetostrictive material, a hollow body 11 and a number of coils 12, 12A-12D.
  • the latter coils 12A-12D are supplied with the current, whereby the rod undergoes contraction, so that cavity 22 is formed between the rod and the hollow body in the manner previously described in connection with FIG. 1.
  • a second magnetic field is generated in one end of the rod.
  • Said second magnetic field pulsates with a frequency which accomplish a balancing movement in that end of the rod.
  • the magnetic field is generated by a supply of current to a number of coils 31 situated around the portion of the hollow body where the end of the rod resides.
  • the rod 12 is made of a magnetostrictive material.
  • the rod 10 is manufactured by so called giant magnetostrictive material, i.e. an alloy between rare earth metals such as samarium (Sm), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er) , thulium (Tm) .
  • rare earth metals such as samarium (Sm), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er) , thulium (Tm) .
  • magnetic transition metals such as iron (Fe), kobolt (Co) and nickel (Ni) are included but in other applications, e.g. together with super conductive materials the transition metals are not included.
  • the magnetostrictive body may be clamped between two plane- parallel plates and by using the magnetic field in the principal way described above, the magnetostrictive body may be caused to move between the plates in the planes thereof, the clamping grip with respect to the plates being kept substantially unchanged. Possibly the grip between the magnetostrictive body and the plate may be obtained solely through the dead weight of the body, the body resting only upon and being supported by a plane plate and thus does not need to be clamped between two plane-parallel plates.
  • coils are provided along the entire length of the hollow body. Instead a plurality of coils are arranged in a pack, the length thereof corresponding substantially to the length of the rod. The pack of coils is then moved along the hollow body together with the rod.

Landscapes

  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

Le procédé décrit sert à amener un premier corps (10; 20), ayant des propriétés magnétostrictives, et un second corps (11), contre lequel le premier corps est placé en contact d'appui avec une certaine prise entre leurs surfaces de contact, à se déplacer l'un par rapport à l'autre, tout en maintenant sensiblement la prise. Dans ledit dispositif, un profil de champ magnétique ayant une intensité de champ variable dans la direction longitudinale du corps est produit dans une section longitudinale du premier corps et est amené à se déplacer le long de la même ligne, au fur et à mesure du déplacement longitudinal du premier corps par rapport au second corps. Selon la présente invention, un courant électrique est fourni séparément à des bobines individuelles d'un groupe de bobines (12). En outre, l'amenée de courant est régulée pour permettre aux bobines (12) de produire des champs magnétiques partiels, formant ensemble ledit profil de champs magnétiques. La présente invention se rapporte également à un dispositif de réalisation dudit procédé. Un tel dispositif comprend plusieurs groupes de bobines (12, 12A-12D, 12F-12I) qui sont disposés le long du second corps (11), et des organes d'alimentation sont prévus pour l'alimentation régulable en courant électrique desdites bobines (12, 12A-12D, 12F-12I). En outre, des organes de régulation (23-27) sont prévus pour réguler le courant alimentant séparément chacune desdites bobines (12, 12A-12D, 12F-12I).
PCT/SE1989/000748 1988-12-27 1989-12-27 Procede et dispositif destines a etre utilises dans un moteur WO1990007821A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8804650A SE8804650L (sv) 1988-12-27 1988-12-27 Saett och anordning vid motor
SE8804650-3 1988-12-27

Publications (1)

Publication Number Publication Date
WO1990007821A1 true WO1990007821A1 (fr) 1990-07-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1989/000748 WO1990007821A1 (fr) 1988-12-27 1989-12-27 Procede et dispositif destines a etre utilises dans un moteur

Country Status (3)

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AU (1) AU4831990A (fr)
SE (1) SE8804650L (fr)
WO (1) WO1990007821A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4133307A1 (de) * 1990-10-09 1992-04-16 Zexel Corp Elektromagnetische betaetigungseinrichtung zum bewegen eines gegenstands
WO1992012569A1 (fr) * 1991-01-07 1992-07-23 Dsp Technology Holdings Limited Procede et dispositif pour moteurs
FR2718159A1 (fr) * 1994-04-02 1995-10-06 Mayer Textilmaschf Tricoteuse à chaîne, équipée d'un dispositif d'entraînement à commande simplifiée.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562385A (en) * 1983-10-17 1985-12-31 Rabson Thomas A Periodic reciprocating motor
WO1988005618A1 (fr) * 1987-01-21 1988-07-28 Fokon F. Olsson Konsultbyrå Ab Procede et dispositif pour systemes de mouvement magnetostrictif

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562385A (en) * 1983-10-17 1985-12-31 Rabson Thomas A Periodic reciprocating motor
WO1988005618A1 (fr) * 1987-01-21 1988-07-28 Fokon F. Olsson Konsultbyrå Ab Procede et dispositif pour systemes de mouvement magnetostrictif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NY TEKNIK-TEKNISK TIDSKRIFT, Vol., No. 48, December 1988 (NORRKOEPING), G. LUNDSTROEM: "Nytt staealldon tio ganger mer kompakt aen ett hydrauliskt", see page 28. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4133307A1 (de) * 1990-10-09 1992-04-16 Zexel Corp Elektromagnetische betaetigungseinrichtung zum bewegen eines gegenstands
WO1992012569A1 (fr) * 1991-01-07 1992-07-23 Dsp Technology Holdings Limited Procede et dispositif pour moteurs
US5382863A (en) * 1991-01-07 1995-01-17 Dsp Holdings Ltd. Method and device in a motor
FR2718159A1 (fr) * 1994-04-02 1995-10-06 Mayer Textilmaschf Tricoteuse à chaîne, équipée d'un dispositif d'entraînement à commande simplifiée.

Also Published As

Publication number Publication date
SE8804650L (sv) 1990-06-28
AU4831990A (en) 1990-08-01
SE8804650D0 (sv) 1988-12-27

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