EP0487552B1 - Electromagnetic rotating actuator - Google Patents

Electromagnetic rotating actuator Download PDF

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Publication number
EP0487552B1
EP0487552B1 EP90911280A EP90911280A EP0487552B1 EP 0487552 B1 EP0487552 B1 EP 0487552B1 EP 90911280 A EP90911280 A EP 90911280A EP 90911280 A EP90911280 A EP 90911280A EP 0487552 B1 EP0487552 B1 EP 0487552B1
Authority
EP
European Patent Office
Prior art keywords
resetting element
rotary actuator
permanent magnet
actuator according
arms
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP90911280A
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German (de)
French (fr)
Other versions
EP0487552A1 (en
Inventor
Thomas Bertolini
Werner Herm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OFFERTA DI LICENZA AL PUBBLICO OFFERTA DI LICENZA
Original Assignee
Robert Bosch GmbH
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Publication of EP0487552A1 publication Critical patent/EP0487552A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
    • F02D9/16—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit the members being rotatable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures
    • H01F7/145—Rotary electromagnets with variable gap

Definitions

  • the invention is based on a turntable according to the preamble of claim 1.
  • JP-U-60-88044 already discloses such a turntable with a magnetic return element which, in the event of power failure of the servomotor, transfers the armature of the turntable to a defined rest position .
  • the known restoring element consists of two further permanent magnets connected to the armature.
  • the servomotor has further permanent magnets for the drive which are fixed to the housing.
  • the maximum torque of the restoring element counteracting the control torque is undesirably large.
  • the turntable according to the invention with the characterizing features of claim 1 has the advantage that the restoring element has a more favorable torque characteristic with a significantly simplified structure.
  • the use of the at least one permanent magnet segment of the servomotor for the reset device also results in a reduction in parts and a shortening of the installation space.
  • the measures listed in the dependent claims allow advantageous refinements and improvements of the rotary actuator specified in claim 1.
  • the asymmetrical cross-sectional shape of the restoring element which brings about a further reduction in the maximum torque at least in one direction of rotation with a simultaneous increase in the restoring angle from which the element turns back into its desired detent position, is particularly advantageous.
  • the disc-shaped design reduces the axial length of the reset device. Due to the small radial width of the arms of the restoring element, a steep zero crossing in the torque-rotation angle characteristic curve and thus and a more precise adherence to the locking point is achieved, into which the element turns back when the servomotor is de-energized.
  • Figure 1 shows a longitudinal section through a rotary actuator
  • Figure 2 shows a reset element in plan view.
  • the rotary actuator 1 has a servomotor 2, the rotor of which acts on a throttle element 3, which is arranged in a bypass line 4 to an intake pipe 5 with a throttle valve for regulating the idle combustion air of an internal combustion engine.
  • the throttle element 3 is designed as a rotary slide valve, which more or less closes a control opening 6 in the bypass line 4.
  • the control opening 6 is arranged in a housing 12 in which the throttle element 3 is also accommodated.
  • the servomotor 2 consists of a central stator 7 with field windings 8 and a cup-shaped armature 9 forming the rotor, which has two permanent magnet segments 10 arranged on its wall in the form of a cylinder jacket.
  • These permanent magnet segments 10 are bowl-shaped and cover an angular range of approximately 135 ° each.
  • the armature 9 has a smooth shaft 11 which is mounted in two bearings 13, 14 held in the housing 12 with low friction.
  • the throttle element 3 controlling the bypass line 4 is fastened to the shaft 11.
  • the stator 7 is mounted on a housing cap 16 which projects beyond the rotor 9 and the stator 7 and is connected to the housing 12. It carries on its axis 17 a restoring element 18 made of ferromagnetic material.
  • the restoring element 18 can thus be rotated like the stator 7. It is designed as a thin disk and is located in the effective area of the permanent magnet segments 10 of the armature 9 in such a way that it extends radially close to the permanent magnets without touching them.
  • the permanent magnet segments 10 protrude beyond the restoring element 18 in an axial extent.
  • the restoring element 18 (see FIG. 2) consists of a central part 19, which is plugged onto the axis 17 and has a central bore 20, which bears two radial extensions 21 which extend in the form of a spoke. At the outer ends of the extensions 21, two laterally directed arms 22, 23, 24, 25 are attached in the manner of a wheel rim, which extend approximately along a circular line forming the circumference of the restoring element 18. One of the arms 25 is longer in the circumferential direction by an extension 26 than the others. Two arms 22 and 23 or 24 and 25 together form a magnetizable pole of the restoring element 18. The two arms 22 and 23 together cover an angle of approximately 135 ° corresponding to the angular range of the permanent magnet segments 10.
  • the two arms 24 and 25 cover one the angular extent of the extension 26 of approximately 20 ° to 30 ° larger angular range than 135 °.
  • the arms 22 to 25 are arranged point-symmetrically to the bore 20 without the shoulder 26. Due to the extended arm 25, the reset element 18 becomes asymmetrical, so that there is neither point nor axis symmetry. This can also be achieved by shortening one arm 25. The free ends of the arms 22 to 25 never touch.
  • the radial width of the arms 22 to 26 is small; in the exemplary embodiment, it is substantially smaller than the material thickness of the disk 18 in the direction of the axis 17. In the extension of the extensions 21, the restoring element 18 has flats 27, so that there the distance to the permanent magnet segments 10 is greater than in the arms 22 to 25.
  • one of the extensions 21 has a threaded hole 29 extending from the circumference to the bore 20, into which a worm screw can be screwed.
  • the return element can also be layered from individual sheets and pressed onto the shaft.
  • the reset element 18 has the task of transferring the rotor and thus the throttle element 3 in the de-energized state of the servomotor 2 into a defined position and holding it there in order to ensure the opening of an emergency running cross-section via the throttle element in the bypass line 4, via which there is sufficient air can flow for the safe continued operation of the internal combustion engine.
  • sufficient restoring torque must be available in every operating position of the throttle member 3 and the rest point of the armature, that is to say the magnetic locking point of the restoring device shown in FIG. 2, must be maintained with great accuracy.
  • the arms 22 to 24 extend approximately over the same length of the permanent magnet segments 10, while the arm 26 projects into the gap formed in the circumferential direction between the permanent magnet segments.
  • the maximum of the restoring torque must not exceed the control torque of the servomotor.
  • the reset device according to the invention fulfills these requirements.
  • the torque curve over the angle of rotation is flatter in comparison to a conventional turntable and still steep at the rest point, so that the rest point remains limited to a narrow angular range of 2 ° to 4 ° (influence of friction and hysteresis).
  • the restoring area is enlarged compared to a symmetrical arrangement, so that when the restoring element is used in a rotary actuator, provision is also made against jumping into the next latching position.
  • the reset angle is increased at least in the direction in which the predominant control range of the servomotor lies from approximately 40 ° to approximately 65 °.
  • the invention is not limited to the exemplary embodiments. It is sufficient for the function of the restoring element if only one of the permanent magnet segments is extended in this way and acts on, for example, a two-arm restoring element.
  • the magnetic reset can also be designed as a four-pole system.
  • the locking points lie on the center of the permanent magnet. Instead, locking points located on the magnetic gap, that is to say rotated by 90 °, can also be designed as operating locking points.
  • the arms 22 to 25 would have to be made thicker and the flats 27 at the ends of the extensions 21 should be formed as pronounced cutouts.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The aim of the invention is to simplify a rotating actuator (1) with a magnetic reset element (18), in particular for controlling the cross-section of a choke, and to improve the torque profile of the reset element (18). To this end, the reset element (18) is made of ferromagnetic material and arranged in the region of the permanent magnet segments (10) of the servomotor (2). The reset element (18) is asymmetrical, with three short arms (22 to 24) and a longer arm (5). In consequence, the maximum torque produced by the element (18) is reduced and the reset angle from which the element (18) returns to its desired locking position is increased. The rotating actuator (1) is particularly suitable as an idling rotating actuator in internal combustion engines.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Drehsteller nach der Gattung des Patentanspruchs 1. Aus der JP-U-60-88044 ist bereits ein solcher Drehsteller mit einem magnetischen Rückstellelement bekannt, das bei Ausfall der Stromversorgung des Stellmotors den Anker des Drehstellers in eine definierte Ruhelage überführt. Das bekannte Rückstellelement besteht neben den gehäusefesten Permanentmagneten aus zwei weiteren, mit dem Anker verbundenen Permanentmagneten. Dabei weist der Stellmotor weitere gehäusefeste Permanentmagneten für den Antrieb auf. Dies führt infolge des kleinen Drehmomentgradienten in der Ruhelage zu einer relativ geringen Rückstellkraft. Andererseits ist das dem Regeldrehmoment entgegenwirkende Maximaldrehmoment des Rückstellelements unerwünscht groß.The invention is based on a turntable according to the preamble of claim 1. JP-U-60-88044 already discloses such a turntable with a magnetic return element which, in the event of power failure of the servomotor, transfers the armature of the turntable to a defined rest position . In addition to the permanent magnets fixed to the housing, the known restoring element consists of two further permanent magnets connected to the armature. The servomotor has further permanent magnets for the drive which are fixed to the housing. As a result of the small torque gradient in the rest position, this leads to a relatively low restoring force. On the other hand, the maximum torque of the restoring element counteracting the control torque is undesirably large.

Bekannt ist ebenfalls durch die US-A-4 500 861 bei einem Drehsteller ein Rückstellelement aus magnetisierbarem Werkstoff zu verwenden, um den Anker im stromlosen Zustand des Stellmotors in eine definierte Lage zu überführen und dort zu halten. Das Rückstellelement wirkt dabei entfernt von den Permanentmagneten des Antriebs.It is also known from US-A-4,500,861 to use a restoring element made of magnetizable material in a rotary actuator in order to transfer the armature into a defined position in the de-energized state of the servomotor and to hold it there. The reset element acts at a distance from the permanent magnets of the drive.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Drehsteller mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß das Rückstellelement bei einem wesentlich vereinfachten Aufbau eine günstigere Drehmomentenkennlinie aufweist. Durch die Verwendung des wenigstens einen Permanentmagnetsegments des Stellmotors auch für die Rückstelleinrichtung ergibt sich eine Teileverringerung und Verkürzung des Bauraumes.The turntable according to the invention with the characterizing features of claim 1 has the advantage that the restoring element has a more favorable torque characteristic with a significantly simplified structure. The use of the at least one permanent magnet segment of the servomotor for the reset device also results in a reduction in parts and a shortening of the installation space.

Durch die in den abhängigen Patentansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Patentanspruch 1 angegebenen Drehstellers möglich. Besonders vorteilhaft ist die asymmetrische Querschnittsform des Rückstellelements, die eine weitere Reduzierung des Drehmomentenmaximums zumindest in einer Drehrichtung bei gleichzeitiger Vergrößerung des Rückstellwinkels bewirkt, aus dem sich das Element wieder in seine gewünschte Raststellung zurückdreht. Die scheibenförmige Bauform reduziert die axiale Baulänge der Rückstelleinrichtung. Durch die geringe radiale Breite der Arme des Rückstellelements wird ein steil durchlaufener Nulldurchgang in der Drehmoment-Drehwinkel-Kennlinie und damit und ein genaueres Einhalten des Rastpunktes erreicht, in den sich das Element in stromlosem Zustand des Stellmotors zurückdreht.The measures listed in the dependent claims allow advantageous refinements and improvements of the rotary actuator specified in claim 1. The asymmetrical cross-sectional shape of the restoring element, which brings about a further reduction in the maximum torque at least in one direction of rotation with a simultaneous increase in the restoring angle from which the element turns back into its desired detent position, is particularly advantageous. The disc-shaped design reduces the axial length of the reset device. Due to the small radial width of the arms of the restoring element, a steep zero crossing in the torque-rotation angle characteristic curve and thus and a more precise adherence to the locking point is achieved, into which the element turns back when the servomotor is de-energized.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung naher erläutert. Figur 1 zeigt einen Längsschnitt durch einen Drehsteller, Figur 2 zeigt ein Rückstellelement in Draufsicht.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. Figure 1 shows a longitudinal section through a rotary actuator, Figure 2 shows a reset element in plan view.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der Drehsteller 1 hat einen Stellmotor 2, dessen Rotor auf ein Drosselorgan 3 wirkt, das in einer Bypassleitung 4 zu einem Ansaugrohr 5 mit Drosselklappe für die Regelung der Leerlauf-Verbrennungsluft einer Brennkraftmaschine angeordnet ist. Das Drosselorgan 3 ist als Drehschieber ausgebildet, das eine Steueröffnung 6 in der Bypassleitung 4 mehr oder weniger verschließt. Die Steueröffnung 6 ist in einem Gehäuse 12 angeordnet, in dem auch das Drosselorgan 3 aufgenommen ist. Der Stellmotor 2 besteht aus einem zentralen Stator 7 mit Feldwicklungen 8 und einem den Rotor bildenden becherförmigen Anker 9, der zwei an seiner zylindermantelförmigen Wand angeordnete Permanentmagnetsegmente 10 aufweist.The rotary actuator 1 has a servomotor 2, the rotor of which acts on a throttle element 3, which is arranged in a bypass line 4 to an intake pipe 5 with a throttle valve for regulating the idle combustion air of an internal combustion engine. The throttle element 3 is designed as a rotary slide valve, which more or less closes a control opening 6 in the bypass line 4. The control opening 6 is arranged in a housing 12 in which the throttle element 3 is also accommodated. The servomotor 2 consists of a central stator 7 with field windings 8 and a cup-shaped armature 9 forming the rotor, which has two permanent magnet segments 10 arranged on its wall in the form of a cylinder jacket.

Diese Permanentmagnetsegmente 10 sind schalenförmig und bedecken einen Winkelbereich von je etwa 135°. Der Anker 9 besitzt eine glatte Welle 11, die in zwei in dem Gehäuse 12 gehaltenen Lagern 13, 14 reibungsarm gelagert ist. An der Welle 11 ist das die Bypassleitung 4 steuernde Drosselorgan 3 befestigt.These permanent magnet segments 10 are bowl-shaped and cover an angular range of approximately 135 ° each. The armature 9 has a smooth shaft 11 which is mounted in two bearings 13, 14 held in the housing 12 with low friction. The throttle element 3 controlling the bypass line 4 is fastened to the shaft 11.

Der Stator 7 ist an einer Gehäusekappe 16 montiert, die den Rotor 9 und den Stator 7 überragt und mit dem Gehäuse 12 verbunden ist. Er trägt auf seiner Achse 17 ein Rückstellelement 18 aus ferromagnetischem Werkstoff. Das Rückstellelement 18 ist somit wie der Stator 7 undrehbar. Es ist als dünne Scheibe ausgebildet und befindet sich im Wirkungsbereich der Permanentmagnetsegmente 10 des Ankers 9 derart, daß es sich radial bis nahe an die Permanentmagnete erstreckt, ohne diese zu berühren. Die Permanentmagnetsegmente 10 überragen das Rückstellelement 18 in axialer Erstreckung.The stator 7 is mounted on a housing cap 16 which projects beyond the rotor 9 and the stator 7 and is connected to the housing 12. It carries on its axis 17 a restoring element 18 made of ferromagnetic material. The restoring element 18 can thus be rotated like the stator 7. It is designed as a thin disk and is located in the effective area of the permanent magnet segments 10 of the armature 9 in such a way that it extends radially close to the permanent magnets without touching them. The permanent magnet segments 10 protrude beyond the restoring element 18 in an axial extent.

Das Rückstellelement 18 besteht (siehe Figur 2) aus einem auf die Achse 17 aufgesteckten Mittelteil 19 mit zentraler Bohrung 20, das zwei gegenüberliegende, speichenförmig sich ersteckende radiale Fortsätze 21 trägt. An den äußeren Enden der Fortsätze 21 sind radkranzförmig jeweils zwei seitlich weggerichtete Arme 22, 23, 24, 25 angebracht, die sich etwa entlang einer den Umfang des Rückstellelements 18 bildenden Kreislinie erstrecken. Einer der Arme 25 ist in Umfangsrichtung um einen Ansatz 26 länger als die anderen. Jeweils zwei Arme 22 und 23 bzw. 24 und 25 bilden zusammen einen magnetisierbaren Pol des Rückstellelements 18. Die beiden Arme 22 und 23 bedecken zusammen einen Winkel von etwa 135° entsprechend dem Winkelbereich der Permanentmagnetsegmente 10. Die beiden Arme 24 und 25 bedecken einen um die Winkelerstreckung des Ansatzes 26 von ca. 20° bis 30° größeren Winkelbereich als 135°. Die Arme 22 bis 25 sind ohne den Ansatz 26 punktsymmetrisch zur Bohrung 20 angeordnet. Durch den verlängerten Arm 25 wird das Rückstellelement 18 unsymmetrisch, so daß weder Punkt noch Achsensymmetrie vorliegt. Dies kann auch durch eine Verkürzung des einen Armes 25 erreicht werden. Die freien Enden der Arme 22 bis 25 berühren sich in keinem Fall. Die radiale Breite der Arme 22 bis 26 ist gering; sie ist im Ausführungsbeispiel wesentlich kleiner als die Materialstärke der Scheibe 18 in Richtung der Achse 17. In Verlängerung der Fortsätze 21 hat das Rückstellelement 18 Abflachungen 27, so daß dort der Abstand zu den Permanentmagnetsegmenten 10 größer ist, als bei den Armen 22 bis 25. Dadurch wird der magnetische Leitwert des Rückstellelements 18 in diesem Bereich verringert, womit ein vorzeitiges Weiterspringen des Elements in die nächste, um circa 90° verdrehte Raststellung, vermieden wird. Zur Befestigung des Rückstellelements 18 bei massiver Ausführung hat einer der Fortsätze 21 ein vom Umfang bis zur Bohrung 20 durchgehendes Gewindeloch 29, in das eine Wurmschraube eindrehbar ist. Das Rückstellelement kann aber auch aus einzelnen Blechen geschichtet und auf die Welle aufgepreßt werden.The restoring element 18 (see FIG. 2) consists of a central part 19, which is plugged onto the axis 17 and has a central bore 20, which bears two radial extensions 21 which extend in the form of a spoke. At the outer ends of the extensions 21, two laterally directed arms 22, 23, 24, 25 are attached in the manner of a wheel rim, which extend approximately along a circular line forming the circumference of the restoring element 18. One of the arms 25 is longer in the circumferential direction by an extension 26 than the others. Two arms 22 and 23 or 24 and 25 together form a magnetizable pole of the restoring element 18. The two arms 22 and 23 together cover an angle of approximately 135 ° corresponding to the angular range of the permanent magnet segments 10. The two arms 24 and 25 cover one the angular extent of the extension 26 of approximately 20 ° to 30 ° larger angular range than 135 °. The arms 22 to 25 are arranged point-symmetrically to the bore 20 without the shoulder 26. Due to the extended arm 25, the reset element 18 becomes asymmetrical, so that there is neither point nor axis symmetry. This can also be achieved by shortening one arm 25. The free ends of the arms 22 to 25 never touch. The radial width of the arms 22 to 26 is small; in the exemplary embodiment, it is substantially smaller than the material thickness of the disk 18 in the direction of the axis 17. In the extension of the extensions 21, the restoring element 18 has flats 27, so that there the distance to the permanent magnet segments 10 is greater than in the arms 22 to 25. As a result, the magnetic conductivity of the restoring element 18 is reduced in this area, thus preventing the element from prematurely jumping into the next detent position rotated by approximately 90 °. For fastening the restoring element 18 in the case of a solid construction, one of the extensions 21 has a threaded hole 29 extending from the circumference to the bore 20, into which a worm screw can be screwed. The return element can also be layered from individual sheets and pressed onto the shaft.

Das Rückstellelement 18 hat die Aufgabe, den Rotor und damit das Drosselorgan 3 in stromlosem Zustand des Stellmotors 2 in eine definierte Lage zu überführen und dort zu halten, um mittels des Drosselorgans in der Bypassleitung 4 die Öffnung eines Notlaufquerschnittes zu gewährleisten, über den ausreichend Luft für den sicheren Weiterlauf der Brennkraftmaschine strömen kann. Dazu muß in jeder Betriebslage des Drosselorgans 3 ein ausreichendes Rückstelldrehmoment zur Verfügung stehen und der Ruhepunkt des Ankers, also der in Figur 2 gezeigte magnetische Rastpunkt der Rückstelleinrichtung mit großer Genauigkeit eingehalten werden. Im Rastpunkt erstrecken sich die Arme 22 bis 24 etwa über die gleiche Länge der Permanentmagnetsegmente 10, während der Arm 26 in die in Umfangsrichtung gebildete Lücke zwischen den Permanentmagnetsegmenten ragt. Das Maximum des Rückstelldrehmoments darf das Regeldrehmoment des Stellmotors nicht überschreiten. Diese Anforderungen erfüllt die erfindungsgemäße Rückstelleinrichtung. Der Drehmomentenverlauf über dem Drehwinkel ist gegenüber einem herkömmlichen Drehsteller im Maximum flacher und trotzdem im Rastpunkt steil, so daß der Rastpunkt auf einen engen Winkelbereich von 2° bis 4° begrenzt bleibt (Reibungs- und Hystereseeinfluß).The reset element 18 has the task of transferring the rotor and thus the throttle element 3 in the de-energized state of the servomotor 2 into a defined position and holding it there in order to ensure the opening of an emergency running cross-section via the throttle element in the bypass line 4, via which there is sufficient air can flow for the safe continued operation of the internal combustion engine. For this purpose, sufficient restoring torque must be available in every operating position of the throttle member 3 and the rest point of the armature, that is to say the magnetic locking point of the restoring device shown in FIG. 2, must be maintained with great accuracy. At the latching point, the arms 22 to 24 extend approximately over the same length of the permanent magnet segments 10, while the arm 26 projects into the gap formed in the circumferential direction between the permanent magnet segments. The maximum of the restoring torque must not exceed the control torque of the servomotor. The reset device according to the invention fulfills these requirements. The torque curve over the angle of rotation is flatter in comparison to a conventional turntable and still steep at the rest point, so that the rest point remains limited to a narrow angular range of 2 ° to 4 ° (influence of friction and hysteresis).

Durch die unsymmetrische Ausbildung des Rückstellelements wird der Rückstellbereich gegenüber einer symmetrischen Anordnung so vergrößert, daß beim Einsatz des Rückstellelements in einem Drehsteller auch Vorsorge gegen ein Überspringen in die nächste Raststellung getroffen ist. Bei symmetrischer Form des Rückstellelements würden sich nämlich zwei gegenüberliegende stärkere und zwei demgegenüber um 90° versetzte schwächere bzw. instabile Rastpunkte ergeben. Bei dem erfindungsgemäßen Rückstellelement ist der Rückstellwinkel zumindest in der Richtung, in der der vorwiegende Regelbereich des Stellmotors liegt, von ca. 40° auf ca. 65° vergrößert.Due to the asymmetrical design of the restoring element, the restoring area is enlarged compared to a symmetrical arrangement, so that when the restoring element is used in a rotary actuator, provision is also made against jumping into the next latching position. In the case of a symmetrical shape of the restoring element, two opposite, stronger and two weaker or unstable locking points offset by 90 ° would result. In the reset element according to the invention, the reset angle is increased at least in the direction in which the predominant control range of the servomotor lies from approximately 40 ° to approximately 65 °.

Die Erfindung beschränkt sich nicht auf die Ausführunggsbeispiele. So ist es für die Funktion des Rückstellements ausreichend, wenn nur eines der Permanentmagnetsegmete so verlängert ist und auf ein beispielsweise nur zweiarmiges Rückstellement wirkt. Statt als zweipoliges System mit zwei ungleichpoligen Permanentmagneten 10 kann die magnetische Rückstellung auch als vierpoliges System ausgebildet sein. Beim Ausführungsbeispiel liegen die Rastpunkte auf der Permanentmagnetmitte. Stattdessen können auch auf der Magnetlücke gelegene, also um 90° verdrehte Rastpunkte als Betriebsrastpunkte ausgebildet sein. Dazu wären die Arme 22 bis 25 dicker auszubilden und die Abflachungen 27 an den Enden der Fortsätze 21 als ausgeprägte Ausschnitte auszubilden.The invention is not limited to the exemplary embodiments. It is sufficient for the function of the restoring element if only one of the permanent magnet segments is extended in this way and acts on, for example, a two-arm restoring element. Instead of a two-pole system with two non-polar permanent magnets 10, the magnetic reset can also be designed as a four-pole system. In the exemplary embodiment, the locking points lie on the center of the permanent magnet. Instead, locking points located on the magnetic gap, that is to say rotated by 90 °, can also be designed as operating locking points. For this purpose, the arms 22 to 25 would have to be made thicker and the flats 27 at the ends of the extensions 21 should be formed as pronounced cutouts.

Claims (9)

  1. Electromagnetic rotary actuator (1) for controlling a restrictor cross-section, in particular in a fuel-carrying line (4) of an internal combustion engine, having a pilot motor (2) which is accommodated in a housing (12, 16) and, with respect to the housing (12, 16) a fixed stator (7) and a rotatable armature (9) connected to a restrictor member (3) of which either the stator (7) or the armature (9) has opposing permanent magnet segments (10) arranged symmetrically relative to the axis of rotation of the armature (9) and the other has field windings (8) through which current flows, as well as having a magnetically acting contactless resetting element (18) for the restrictor member (3), the resetting element (18) being situated in the field of at least one of the permanent magnet segments (10), characterized in that the resetting element (18) consists of a ferromagnetic material, and in that at least one of the permanent magnet segments (10) is lengthened in the longitudinal direction of the pilot motor (2) and the resetting element (18) is situated in the lengthened region of this at least one permanent magnet segment (10).
  2. Rotary actuator according to Claim 1, characterized in that in a plane perpendicular to the shaft (17) of the stator (7) the resetting element (18) is asymmetric, in particular neither centrosymmetric or axially symmetric.
  3. Rotary actuator according to one of the preceding claims, characterized in that the resetting element (18) consists of a disc which is thin in axial extent.
  4. Rotary actuator according to one of the preceding claims, characterized in that the resetting element (18) has two mutually radially opposing extensions (21) in the form of spokes, and two arms (22 to 25) respectively extend along an imaginary circular line from the outer end of each extension (21).
  5. Rotary actuator according to one of the preceding claims, characterized in that one of the arms (25) of the resetting element (18) is longer or shorter than the other three arms (22 to 24).
  6. Rotary actuator according to one of the preceding claims, characterized in that the arms (22 to 25) are constructed to be only thin in radial extent.
  7. Rotary actuator according to one of the preceding claims, characterized in that the field windings (8) and the resetting element (18) are arranged on the stator (7) of the pilot motor (2).
  8. Rotary actuator according to one of the preceding claims, characterized in that the armature (9) of the pilot motor (2) is constructed embracing the stator (7) in a cup-shaped fashion, and the permanent magnet segments (10) are arranged overlapping axially on the cylindrical walls of the armature (9) and of the resetting element (18).
  9. Rotary actuator according to one of the preceding claims, characterized in that in continuations of the extensions (21) the resetting element (18) bears flats (27) in the region of which the spacing of the resetting element (18) to the permanent magnet segments (10) is greater than in the region of the arms (22 to 25).
EP90911280A 1989-08-16 1990-08-03 Electromagnetic rotating actuator Expired - Lifetime EP0487552B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926911A DE3926911A1 (en) 1989-08-16 1989-08-16 ELECTROMAGNETIC TURNTABLE
DE3926911 1989-08-16

Publications (2)

Publication Number Publication Date
EP0487552A1 EP0487552A1 (en) 1992-06-03
EP0487552B1 true EP0487552B1 (en) 1994-03-09

Family

ID=6387151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90911280A Expired - Lifetime EP0487552B1 (en) 1989-08-16 1990-08-03 Electromagnetic rotating actuator

Country Status (10)

Country Link
US (1) US5402022A (en)
EP (1) EP0487552B1 (en)
JP (1) JP2801397B2 (en)
KR (1) KR0171904B1 (en)
AU (2) AU638266B2 (en)
BR (1) BR9007594A (en)
DE (2) DE3926911A1 (en)
ES (1) ES2051021T3 (en)
HU (1) HU208759B (en)
WO (1) WO1991003062A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756660B1 (en) * 1996-12-04 1999-04-02 Moving Magnet Tech ELECTROMAGNETIC ACTUATOR FOR THE ROTATIONAL MOVEMENT OF A MOBILE MEMBER ON A LIMITED TRAVEL
DE19932826A1 (en) * 1999-07-14 2001-01-25 Mann & Hummel Filter Pipe with variable intake cross-section
US6497245B1 (en) 1999-10-13 2002-12-24 Denso Corporation Intake air controller for internal combustion engine and manufacturing the same
DE10008296A1 (en) * 2000-02-23 2001-02-22 Daimler Chrysler Ag Throttle flap element actuating device for combustion engine intake manifold system, uses electrically driven rotary magnet as drive element with rotor joined torsionally tight to throttle flap element shaft
FR2837032B1 (en) * 2002-03-05 2004-08-06 Moving Magnet Tech Mmt LINEAR ACTUATOR COMPRISING AN ELECTRIC POLYPHASE MOTOR
FR2837033B1 (en) * 2002-03-05 2004-09-24 Moving Magnet Tech Mmt LINEAR ACTUATOR COMPRISING AN ELECTRIC POLYPHASE MOTOR
CN103453164B (en) * 2013-09-13 2017-01-11 河北宝信钢铁集团有限公司 Gate valve
AU2019228585A1 (en) * 2018-02-28 2020-09-24 Clio Technology, LLC Automated pumping system and methods

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US3234436A (en) * 1962-09-12 1966-02-08 Daco Instr Company Inc Rotary electromagnetic actuator
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GB1237383A (en) * 1968-09-17 1971-06-30 Ferranti Ltd Improvements relating to rotary electromagnetic actuators
FR2209246B1 (en) * 1972-12-05 1978-03-03 Fresard Freres Sa
US4500861A (en) * 1983-02-17 1985-02-19 Nelson Victor H Sector motor having latching means for rotor in multiple positions
GB8811650D0 (en) * 1988-05-17 1988-06-22 Econocruise Ltd Improvements in & relating to electromagnetic actuators
DE4019749A1 (en) * 1990-06-21 1992-01-09 Bosch Gmbh Robert ELECTROMAGNETIC TURNTABLE

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Patent Abstracts of Japan, Vol. 9, No. 110 (E-314)(1833), 15.05.1985, & JP-A-60 2064 *

Also Published As

Publication number Publication date
AU6052790A (en) 1991-04-03
HU9200457D0 (en) 1992-04-28
HUT60565A (en) 1992-09-28
AU648461B2 (en) 1994-04-21
BR9007594A (en) 1992-06-30
AU638266B2 (en) 1993-06-24
HU208759B (en) 1993-12-28
DE59004952D1 (en) 1994-04-14
KR920704320A (en) 1992-12-19
DE3926911A1 (en) 1991-02-21
KR0171904B1 (en) 1999-05-01
WO1991003062A1 (en) 1991-03-07
JPH04507327A (en) 1992-12-17
EP0487552A1 (en) 1992-06-03
US5402022A (en) 1995-03-28
ES2051021T3 (en) 1994-06-01
AU3530993A (en) 1993-07-29
JP2801397B2 (en) 1998-09-21

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