EP0432181A1 - Electric rotary actuator. - Google Patents

Electric rotary actuator.

Info

Publication number
EP0432181A1
EP0432181A1 EP19890909163 EP89909163A EP0432181A1 EP 0432181 A1 EP0432181 A1 EP 0432181A1 EP 19890909163 EP19890909163 EP 19890909163 EP 89909163 A EP89909163 A EP 89909163A EP 0432181 A1 EP0432181 A1 EP 0432181A1
Authority
EP
European Patent Office
Prior art keywords
pole
stator
rotor
poles
rotary actuator
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.)
Granted
Application number
EP19890909163
Other languages
German (de)
French (fr)
Other versions
EP0432181B1 (en
Inventor
Corneliu Lungu
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0432181A1 publication Critical patent/EP0432181A1/en
Application granted granted Critical
Publication of EP0432181B1 publication Critical patent/EP0432181B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
    • F02D2011/102—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator

Definitions

  • the invention relates to an electric rotary actuator for driving an actuator, in particular a throttle valve in the air intake pipe of an internal combustion engine, the type defined in the preamble of claim 1.
  • Such a rotary actuator is described for example in DE-OS 37 43 309.
  • E-gas rotary actuators it is essential that if the power supply fails, the rotary actuator returns to its starting position, in which the throttle valve largely closes the cross section of the air intake pipe.
  • a return spring acting on the actuating shaft or on the throttle valve connected in a rotationally fixed manner is provided for this purpose.
  • such a return spring adversely affects the useful torque available on the actuating shaft.
  • stator and rotor poles are designed identically and symmetrically and are evenly distributed on the stator and rotor.
  • the turntable according to the invention with the characterizing features of claim 1 has the advantage that a maximum due to the asymmetrical design of the stator and rotor poles in the manner mentioned within the predetermined angle of rotation range of the rotor
  • Magnetic flux change is caused, which generally leads to high efficiency.
  • the torque curve can be specifically measured depending on the angle of rotation.
  • the air gap is additionally formed asymmetrically such that the radial width of the air gap sections between the rotor and stator poles is minimal in the starting position of the rotor when the excitation winding is without current and is maximal in the end position reached by stator excitation, then occurs in the After switching off the stator excitation, the end position of the rotor has a magnetic restoring torque which turns the rotor back into its starting position.
  • a rotatable with the throttle valve connected to the control shaft automatically returns to its closed position. This eliminates the need for a return spring and by eliminating it, the useful torque on the actuating shaft is improved.
  • the rotor poles abut one another on an axial longitudinal side and extend in the circumferential direction over approximately 120 ° to 130 ° and that the pole width of the one stator pole is approximately 130 ° and that of the other is approximately 230 °, the surface section of the pole surface of the stator pole, which extends from the leading edge of this stator pole over approximately 100 °, being set back from the remaining surface section.
  • the drawing shows a side view of an electric turntable, partially sectioned and in a schematic representation.
  • the rotary actuator shown schematically in the drawing • serves to drive a throttle valve in the air intake pipe of an internal combustion engine, which minimally releases the cross section of the air intake pipe in an idling position and completely in a full throttle position. Idle and full throttle positions are indicated in the drawing by a dash-dotted line. The transition from idle to full throttle is achieved by rotating the throttle valve by approx. 90 °.
  • the throttle valve is connected to an actuating shaft 10 of the rotary actuator.
  • the rotary actuator consists in a known manner of a stator 11 and a rotor 12 rotating in the stator 11, which rotor is connected in a rotationally fixed manner to the actuating shaft 10.
  • the stator 11 carries two distinct stator poles 13, 14, which are designed asymmetrically with pole widths that differ greatly from one another (measured in the circumferential direction).
  • the two stator poles 13, 14 are connected to one another via a yoke 17.
  • the yoke 17 is surrounded by a coil 18 having a single-stranded excitation winding 19, the predetermined desired to ⁇ rotation of the rotor 12 with a direct current size is Bestro t.
  • the polarity of the excitation winding 19 is chosen so that the stator pole 14 with the larger pole width forms the south pole and the stator pole 13 with the smaller pole width the north pole.
  • the rotor 12 carries two permanent magnetic rotor poles 20 and 21, which are formed by shell-shaped permanent magnet segments.
  • the identically designed permanent magnet segments 22, 23 are fastened on a support 24, which is connected in a rotationally fixed manner to the adjusting shaft 10, in an asymmetrical arrangement, the two permanent magnet segments 22, 23 abutting each other with one of their axial longitudinal sides 22a and 23a.
  • the magnetization of the rotor poles 20, 21 is such that, in the starting position of the rotor 12 shown in the drawing, the permanent magnetic north pole 22 is essentially overlapped by that stator pole 13 which also represents the north pole and the permanent magnetic south pole 23 in the region of the the south pole 0 forming stator pole 14.
  • An annular air gap 25 is formed between the stator poles 13, 14 and the rotor poles 20, 21.
  • the air gap section 251 under the pole face 15 of the stator pole 13 is essentially constant, there are two air gap sections 252 and 253 with a widely differing radial air gap width below the pole face 16 of the stator pole 14. While the air gap section 252 has the same air gap width as the air gap section 251 under the stator pole 13, the radial air gap width in the region of the air section 253 is greatly increased.
  • the stator pole 14 with the larger pole width has a pole surface section 161 which extends approximately over half the pole width and is radially set back with respect to the remaining surface section 162 of the pole surface 16.
  • the arrangement of the asymmetrical stator poles 13 and 14 and the asymmetrical rotor poles 20, 21 seated on the carrier 24 is such that in the starting position of the rotor 12 shown in the drawing, with the excitation winding 19 deenergized, the rotor and stator poles 13, 14 and 20, respectively , 21 are opposite one another at the air gap 25 with a minimal air gap width and when the rotor 12 is rotated by approximately 90 ° the rotor pole 20 forming the north pole is essentially covered by the recessed surface section 161 of the pole face 16 of the stator pole 14 forming the south pole with the larger pole width.
  • This has the effect that in this state, when the energization of the excitation winding 19 is switched off, the rotor 12 returns to the starting position shown in the drawing.
  • the pole width of the rotor poles 20, 21 measured in the circumferential direction bears approximately 130 °
  • the pole width of the stator pole 13 with the smaller pole width 13 also measured in the circumferential direction likewise approximately 130 ° and
  • Pole width of the stator pole 14 with the larger pole width about 230 °.
  • the set-back surface section 161 of the pole surface 16 of the latter stator pole 14 extends from the pole edge running up with respect to the rotor rotation over approximately 100 °. Due to the asymmetrical design of the rotor and stator poles 20, 21, 13, 14, a torque-dependent curve of the torque can be achieved. A maximum change in magnetic flux is brought about within the predetermined rotation angle range of 90 °, which leads to high efficiency.
  • the rotor 12 Due to the minimum air gap width in the starting position of the rotor 12 and the maximum air gap width in the end position of the rotor 12, the rotor 12 returns to its starting position when the stator excitation is switched off by the magnetic moment, so that a separate, reducing the useful torque on the actuating shaft 10 Return spring for the rotor 12 can be omitted.

Abstract

Un actuateur rotatif électrique d'entraînement d'un élément de réglage, notamment d'une soupape d'étranglement agencée dans la tubulure d'aspiration d'air d'un moteur à combustion interne, comprend un stator bipolaire (11) excité par courant continu et un rotor bipolaire (12) à aimants permanents. Afin d'augmenter son efficacité et d'obtenir une courbe de couple mesurable en fonction de l'angle de rotation, les deux pôles (13, 14) du stator sont asymétriques et les pôles (20, 21) du rotor (12) sont asymétriquement agencés et s'étendent sur un angle circonférentiel supérieur à 90°.An electric rotary actuator for driving an adjustment element, in particular a throttle valve arranged in the air intake manifold of an internal combustion engine, comprises a bipolar stator (11) excited by current continuous magnet and a bipolar rotor (12) with permanent magnets. In order to increase its efficiency and obtain a measurable torque curve as a function of the angle of rotation, the two poles (13, 14) of the stator are asymmetrical and the poles (20, 21) of the rotor (12) are asymmetrically arranged and extend over a circumferential angle greater than 90 °.

Description

- </ -- < / -
Elektrischer DrehstellerElectric turntable
Stand der TechnikState of the art
Die Erfindung betrifft einen elektrischen Drehsteller zum Antrieb eines Stellelements, insbesondere einer Drosselklappe im Luftansaugrohr einer Brennkraf maschine, der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention relates to an electric rotary actuator for driving an actuator, in particular a throttle valve in the air intake pipe of an internal combustion engine, the type defined in the preamble of claim 1.
Ein solcher Drehsteller ist beispielsweise in der DE-OS 37 43 309 beschrieben. Bei diesen Drehstellern für Drosselklappen mit einem maximalen Drehwinkelbereich von 90°, sog. E-Gas-Drehstellern, ist es wesentlich, daß bei Ausfall der Stromversorgung der Drehsteller in seine Ausgangslage zurückkehrt, in welcher die Drosselklappe den Querschnitt αes Luftansaugrohrs weitgehend verschließt. Bei einem bekannten Drehsteller für eine Drosselklappe (DE-OS 32" 34 468) ist hierzu eine an der Stellwelle oder an der damit drehfest verbundenen Drosselklappe angreifende Rückstellfeder vorgesehen. Eine solche Rückstellfeder beeinflußt jedoch das an der Stellwelle zur Verfügung stehende Nutzmoment ungünstig.Such a rotary actuator is described for example in DE-OS 37 43 309. With these rotary actuators for throttle valves with a maximum rotation angle range of 90 °, so-called E-gas rotary actuators, it is essential that if the power supply fails, the rotary actuator returns to its starting position, in which the throttle valve largely closes the cross section of the air intake pipe. In a known rotary actuator for a throttle valve (DE-OS 32 "34 468), a return spring acting on the actuating shaft or on the throttle valve connected in a rotationally fixed manner is provided for this purpose. However, such a return spring adversely affects the useful torque available on the actuating shaft.
Bei beiden Drehstellern sind die Stator- und Rotorpole gleich und symmetrisch ausgebildet und am Stator und Rotor gleichmäßig verteilt angeordnet.In both rotary actuators, the stator and rotor poles are designed identically and symmetrically and are evenly distributed on the stator and rotor.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Drehsteller mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß durch die unsymmetrische Gestaltung der Stator- und Rotorpole in der genannten Weise innerhalb des vorgegebenen Drehwinkelbereichs des Rotors eine maximaleThe turntable according to the invention with the characterizing features of claim 1 has the advantage that a maximum due to the asymmetrical design of the stator and rotor poles in the manner mentioned within the predetermined angle of rotation range of the rotor
Magnetflußänderung bewirkt wird, was grundsätzlich zu einem hohen Wirkungsgrad führt. Der Drehmomentverlauf kann dabei gezielt drehwinkelabhängig bemessen werden.Magnetic flux change is caused, which generally leads to high efficiency. The torque curve can be specifically measured depending on the angle of rotation.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Drehstellers möglich.Advantageous further developments and improvements of the rotary actuator specified in claim 1 are possible through the measures listed in the further claims.
Wird gemäß einer bevorzugten Ausführungsform der Erfindung noch zusätzlich der Luftspalt unsymmetrisch derart ausgebildet, daß die radiale Breite der Luftspaltabschnitte zwischen den Rotor- und Statorpolen in der Ausgangslage des Rotors bei stromloser Erregerwicklung minimal und in der durch Statorerregung erreichten Endlage maximal ist, so tritt in der Endlage des Rotors nach Abschalten der Statorerregung ein magnetisches Rückstellmoment auf, das den Rotor in seine Ausgangslage zurückdreht. Eine drehfest mit der Stellwelle verbundene Drosselklappe kehrt damit automatisch in ihre Schließstellung zurück. Damit ist eine Rückstellfeder überflüssig und durch deren Wegfall wird das Nutzmoment an der Stellwelle verbessert.If, according to a preferred embodiment of the invention, the air gap is additionally formed asymmetrically such that the radial width of the air gap sections between the rotor and stator poles is minimal in the starting position of the rotor when the excitation winding is without current and is maximal in the end position reached by stator excitation, then occurs in the After switching off the stator excitation, the end position of the rotor has a magnetic restoring torque which turns the rotor back into its starting position. A rotatable with the throttle valve connected to the control shaft automatically returns to its closed position. This eliminates the need for a return spring and by eliminating it, the useful torque on the actuating shaft is improved.
Eine annähernd optimale konstruktive Auslegung des erfindungsgemäßen Drehstellers erhält man dadurch, daß gemäß einer weiteren Ausführungsform der Erfindung die Rotorpole an einer axialen Längsseite etwa aneinanderstoßen und sich in ümfangsrichtung über etwa 120° bis 130° erstrecken und daß die Polbreite des einen Statorpols etwa 130° und die des anderen etwa 230° beträgt, wobei der von der auflaufenden Kante dieses Statorpols über etwa 100° sich erstreckende Flächenabschnitt der Polfläche des Statorpols gegenüber dem verbleibenden Flächenabschnitt zurückversetzt ist.An approximately optimal constructive design of the turntable according to the invention is obtained in that, according to a further embodiment of the invention, the rotor poles abut one another on an axial longitudinal side and extend in the circumferential direction over approximately 120 ° to 130 ° and that the pole width of the one stator pole is approximately 130 ° and that of the other is approximately 230 °, the surface section of the pole surface of the stator pole, which extends from the leading edge of this stator pole over approximately 100 °, being set back from the remaining surface section.
Zeichnungdrawing
Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Dabei zeigt die Zeichnung eine Seitenansicht eines elektrischen Drehstellers, teilweise geschnitten und in schematischer Darstellung.The invention is explained in more detail in the following description with reference to an embodiment shown in the drawing. The drawing shows a side view of an electric turntable, partially sectioned and in a schematic representation.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Der in der Zeichnung schematisch dargestellte Drehsteller • dient zum Antrieb einer Drosselklappe im Luftansaugrohr einer Brennkraftmaschine, die den Querschnitt des Luftansaugrohrs in einer LeerlaufStellung minimal und in einer Vollgasstellung vollständig freigibt. Leerlauf- und Vollgasstellung sind in der Zeichnung durch strichpunktierte Linie gekennzeichnet. Der Übergang von LeerlaufStellung in Vollgasstellung wird durch eine Drehung der Drosselklappe um ca. 90° bewirkt. Hierzu ist die Drosselklappe mit einer Stellwelle 10 des Drehstellers verbunden. Der Drehsteller besteht in bekannter Weise aus einem Stator 11 und einem im Stator 11 drehenden Rotor 12, der drehfest mit der Stellwelle 10 verbunden ist. Der Stator 11 trägt zwei ausgeprägte Statorpole 13,14, die asymmetrisch mit stark voneinander abweichenden Polbreiten (in ümfangsrichtung gemessen) ausgebildet sind. Die beiden Statorpole 13,14 sind über ein Rückschlußjoch 17 miteinander verbunden. Das Rückschlußjoch 17 wird von einer Spule 18 mit einer einsträngigen Erregerwicklung 19 umschlossen, die zur θ gewünschten Verdrehung des Rotors 12 mit einem Gleichstrom vorgegebener Größe bestro t wird. Die Polung der Erregerwicklung 19 ist dabei so gewählt, daß der Statorpol 14 mit größerer Polbreite den Südpol und der Statorpol 13 mit der kleineren Polbreite den Nordpol bildet.The rotary actuator shown schematically in the drawing • serves to drive a throttle valve in the air intake pipe of an internal combustion engine, which minimally releases the cross section of the air intake pipe in an idling position and completely in a full throttle position. Idle and full throttle positions are indicated in the drawing by a dash-dotted line. The transition from idle to full throttle is achieved by rotating the throttle valve by approx. 90 °. For this purpose, the throttle valve is connected to an actuating shaft 10 of the rotary actuator. The rotary actuator consists in a known manner of a stator 11 and a rotor 12 rotating in the stator 11, which rotor is connected in a rotationally fixed manner to the actuating shaft 10. The stator 11 carries two distinct stator poles 13, 14, which are designed asymmetrically with pole widths that differ greatly from one another (measured in the circumferential direction). The two stator poles 13, 14 are connected to one another via a yoke 17. The yoke 17 is surrounded by a coil 18 having a single-stranded excitation winding 19, the predetermined desired to θ rotation of the rotor 12 with a direct current size is Bestro t. The polarity of the excitation winding 19 is chosen so that the stator pole 14 with the larger pole width forms the south pole and the stator pole 13 with the smaller pole width the north pole.
5 Entsprechend der zweilpoligen Ausführung des Stators 11 trägt der Rotor 12 zwei permanentmagnetische Rotorpole 20 bzw. 21, die von schalenförmigen Permanentmagnetsegmenten gebildet werden. Die identisch ausgebildeten Permanentmagnetsegmenten 22,23 sind auf einem mit der o Stellwelle 10 drehfest verbundenen Träger 24 in unsymmetrischer Anordnung befestigt, wobei die beiden Permanentmagnetsegmente 22,23 mit jeweils einer ihrer axialen Längsseiten 22a und 23a aneinanderstoßen. Die Magnetisierung der Rotorpole 20,21 ist dabei so getroffen, 5 daß in der in der Zeichnung dargestellten Ausgangslage des Rotors 12 der permanentmagnetische Nordpol 22 im wesentlichen von demjenigen Statorpol 13 übergriffen wird, der ebenfalls den Nordpol darstellt und der permanentmagnetische Südpol 23 im Bereich des den Südpol 0 bildenden Statorpols 14 liegt.5 Corresponding to the two-pole design of the stator 11, the rotor 12 carries two permanent magnetic rotor poles 20 and 21, which are formed by shell-shaped permanent magnet segments. The identically designed permanent magnet segments 22, 23 are fastened on a support 24, which is connected in a rotationally fixed manner to the adjusting shaft 10, in an asymmetrical arrangement, the two permanent magnet segments 22, 23 abutting each other with one of their axial longitudinal sides 22a and 23a. The magnetization of the rotor poles 20, 21 is such that, in the starting position of the rotor 12 shown in the drawing, the permanent magnetic north pole 22 is essentially overlapped by that stator pole 13 which also represents the north pole and the permanent magnetic south pole 23 in the region of the the south pole 0 forming stator pole 14.
Zwischen den Statorpolen 13,14 und den Rotorpolen 20,21 ist ein ringförmiger Luftspalt 25 ausgebildet. Während der Luftspaltabschnitt 251 unter der Polfläche 15 des Statorpols 13 im wesentlichen konstant ist, liegen unter der Polfläche 16 des Statorpols 14 zwei Luftspaltabschnitt 252 und 253 mit stark voneinander abweichender radialer Luftspaltbreite. Während der Luftspaltabschnitt 252 eine gleiche Luftspaltbreite wie der Luftspaltabschnitt 251 unter dem Statorpol 13 aufweist, ist die radiale Luftspaltbreite im Bereich des Luftabschnitts 253 stark vergrößert. Um dies zu erreichen, weist der Statorpol 14 mit der größeren Polbreite einen Polflächenabschnitt 161 auf, der sich etwa über die Hälfte der Polbreite erstreckt und gegenüber dem verbleibenden Flächenabschnitt 162 der Polfläche 16 radial zurückversetzt ist. Die Anordnung der unsymmetrischen Statorpole 13 und 14 und der asymmetrisch auf dem Träger 24 sitzenden Rotorpole 20,21 ist so getroffen, daß in der in der Zeichnung dagestellten Ausgangslage des Rotors 12 bei unbestromter Erregerwicklung 19 die Rotor- und Statorpole 13,14 bzw. 20,21 einander am Luftspalt 25 mit minimaler Luftspaltbreite gegenüberliegen und bei Drehung des Rotors 12 um ca. 90° der den Nordpol bildende Rotorpol 20 im wesentlichen von dem zurückversetzten Flächenabschnitt 161 der Polfläche 16 des den Südpol bildenden Statorpols 14 mit der größeren Polbreite überdeckt wird. Dies bewirkt, daß in diesem Zustand bei Abschaltung der Bestromung der Erregerwicklung 19 der Rotor 12 in die in der Zeichnung dargestellte Ausgangslage zurückkehrt.An annular air gap 25 is formed between the stator poles 13, 14 and the rotor poles 20, 21. During the air gap section 251 under the pole face 15 of the stator pole 13 is essentially constant, there are two air gap sections 252 and 253 with a widely differing radial air gap width below the pole face 16 of the stator pole 14. While the air gap section 252 has the same air gap width as the air gap section 251 under the stator pole 13, the radial air gap width in the region of the air section 253 is greatly increased. In order to achieve this, the stator pole 14 with the larger pole width has a pole surface section 161 which extends approximately over half the pole width and is radially set back with respect to the remaining surface section 162 of the pole surface 16. The arrangement of the asymmetrical stator poles 13 and 14 and the asymmetrical rotor poles 20, 21 seated on the carrier 24 is such that in the starting position of the rotor 12 shown in the drawing, with the excitation winding 19 deenergized, the rotor and stator poles 13, 14 and 20, respectively , 21 are opposite one another at the air gap 25 with a minimal air gap width and when the rotor 12 is rotated by approximately 90 ° the rotor pole 20 forming the north pole is essentially covered by the recessed surface section 161 of the pole face 16 of the stator pole 14 forming the south pole with the larger pole width. This has the effect that in this state, when the energization of the excitation winding 19 is switched off, the rotor 12 returns to the starting position shown in the drawing.
Bei einer realisierten Ausführungsform des beschriebenen Drehstellers trägt die in Umfangsrichtung gemessene Polbreite der Rotorpole 20,21 etwa 130°, die ebenfalls in Umfangsrichtung gemessene Polbreite des Statorpols 13 mit der kleineren Polbreite ebenfalls etwa 130° und dieIn a realized embodiment of the described rotary actuator, the pole width of the rotor poles 20, 21 measured in the circumferential direction bears approximately 130 °, the pole width of the stator pole 13 with the smaller pole width 13 also measured in the circumferential direction likewise approximately 130 ° and
Polbreite des Statorpols 14 mit der größeren Polbreite etwa 230°. Der zurückversetzte Flächenabschnitt 161 der Polfläche 16 des letztgenannten Statorpols 14 erstreckt sich dabei von der bezüglich der Rotordrehung auflaufenden Polkante über etwa 100°. Durch die unsymmetrische Gestaltung der Rotor- und Statorpole 20,21,13,14 kann ein drehwinkelabhängiger Verlauf des Drehmoments erzielt werden. Innerhalb des vorgegebenen Drehwinkelbereichs von 90° wird eine maximale Magnetflußänderung bewirkt, was zu einem hohen Wirkungsgrad führt. Durch die minimale Luftspaltbreite in der Ausgangslage des Rotors 12 und durch die maximale Luftspaltbreite in der Endlage des Rotors 12 kehrt der Rotor 12 bei Abschaltung der Statorerregung durch das magnetische Moment in seine Ausgangslage zurück, so daß eine gesonderte, das Nutzmoment an der Stellwelle 10 reduzierende Rückstellfeder für den Rotor 12 entfallen kann. Pole width of the stator pole 14 with the larger pole width about 230 °. The set-back surface section 161 of the pole surface 16 of the latter stator pole 14 extends from the pole edge running up with respect to the rotor rotation over approximately 100 °. Due to the asymmetrical design of the rotor and stator poles 20, 21, 13, 14, a torque-dependent curve of the torque can be achieved. A maximum change in magnetic flux is brought about within the predetermined rotation angle range of 90 °, which leads to high efficiency. Due to the minimum air gap width in the starting position of the rotor 12 and the maximum air gap width in the end position of the rotor 12, the rotor 12 returns to its starting position when the stator excitation is switched off by the magnetic moment, so that a separate, reducing the useful torque on the actuating shaft 10 Return spring for the rotor 12 can be omitted.

Claims

Ansprüche Expectations
1. Elektrischer Drehsteller zum Antrieb eines1. Electric turntable to drive one
Stellelements, insbesondere einer Drosselklappe im Luftansaugrohr einer Brennkraftmaschine, mit einem Stator, der eine Gleichstromerregerwicklung und zweiAdjusting element, in particular a throttle valve in the air intake pipe of an internal combustion engine, with a stator, which has a DC excitation winding and two
Statorpole aufweist, und mit einem zwischen den Statorpolen drehbeweglichen, mit einer Stellwelle fest verbundenen Rotor, der zwei gegensinnig magnetisierte permanentmagnetische Rotorpole trägt, die unter Belassung eines Luftspaltes den Statorpolen gegenüberliegen, dadurch gekennzeichnet, daß die beiden Statorpole (13,14) unsymmetrisch mit stark voneinander abweichender Polbreite, in Umfangsrichtung gemessen, ausgebildet sind und daß die Rotorpole (20,21) asymmetrisch am Rotor (12) angeordnet sind und sich jeweils über einen Umfangswinkel von größer als 90° erstrecken. Has stator poles, and with a rotatably movable between the stator poles, fixedly connected to an adjusting shaft, which carries two oppositely magnetized permanent magnet rotor poles, which are left opposite to the stator poles while leaving an air gap, characterized in that the two stator poles (13, 14) are asymmetrical with strong Pole width deviating from one another, measured in the circumferential direction, and that the rotor poles (20, 21) are arranged asymmetrically on the rotor (12) and each extend over a circumferential angle of greater than 90 °.
2. Drehsteller nach Anspruch 1, dadurch gekennzeichnet, daß die in Umfangsrichtung gemessene Polbreite des Statorpols (13) mit der kleineren Polbreite in etwa gleich dem Erstreckungswinkel der Rotorpole (20,21) ist.2. Rotary actuator according to claim 1, characterized in that the pole width of the stator pole (13) measured in the circumferential direction with the smaller pole width is approximately equal to the angle of extension of the rotor poles (20, 21).
3. Drehsteller nach Anspruch 2, dadurch gekennzeichnet, daß die Rotorpole (20,21) längs ihrer axialen Längsseite nahezu aneinanderstoßen und sich über etwa 120° bis 130° erstrecken und daß die Polbreite des Statorpols (13) mit der kleineren Polbreite etwa 120° bis 130° und die Polbreite des Statorpols (14) mit der größeren Polbreite etwa 230° beträgt.3. Rotary actuator according to claim 2, characterized in that the rotor poles (20,21) abut almost along their axial longitudinal side and extend over about 120 ° to 130 ° and that the pole width of the stator pole (13) with the smaller pole width about 120 ° up to 130 ° and the pole width of the stator pole (14) with the larger pole width is about 230 °.
4. Drehsteller nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß die Rotorpole (20,21) als schalenförmige Permanentmagnetsegmente (22,23) ausgebildet sind und auf einem drehfest mit der Stellwelle (10) verbundenen Träger (24) aus weichmagnetischem Material sitzen.4. Rotary actuator according to one of claims 1-3, characterized in that the rotor poles (20,21) are designed as shell-shaped permanent magnet segments (22,23) and on a rotatably connected to the actuating shaft (10) carrier (24) made of soft magnetic material sit.
5. Drehsteller nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß der Luftspalt (25) unsymmetrisch derart ausgebildet ist, daß in einer Drehstellung des Rotors (12), vorzugsweise in seiner 90°-Drehstellung, zwischen mindestens einem Teilabschnitt eines Rotor- und Statorpols (20,14) eine größere radiale Luftspaltbreite besteht.5. Rotary actuator according to one of claims 1-4, characterized in that the air gap (25) is designed asymmetrically such that in a rotational position of the rotor (12), preferably in its 90 ° rotational position, between at least a portion of a rotor and the stator poles (20, 14) have a larger radial air gap width.
6. Drehsteller nach Anspruch 5, dadurch gekennzeichnet, daß zur Bildung des unsymmetrischen Luftspaltes (25) die Polfläche (16) des Statorpols (14) mit der größeren Polbreite einen etwa über die Hälfte der Polbreite sich erstreckenden Flächenabschnitt (161) aufweist, der gegenüber dem verbleibenden Flächenabschnitt (162) radial zurückversetzt ist. 6. Rotary actuator according to claim 5, characterized in that to form the asymmetrical air gap (25), the pole face (16) of the stator pole (14) with the larger pole width has an approximately half the pole width extending surface section (161) opposite the remaining surface section (162) is set back radially.
7. Drehsteller nach Anspruch 3 und 6, dadurch gekennzeichnet, daß der zurückversetzte Polflächenabschnitt (161) des Statorpols (14) sich von der bezüglich der Rotordrehung auflaufende Polkante über etwa 100° der Polbreite erstreckt. 7. Rotary actuator according to claim 3 and 6, characterized in that the set-back pole face section (161) of the stator pole (14) extends from the pole edge running up with respect to the rotor rotation over approximately 100 ° of the pole width.
EP89909163A 1988-09-05 1989-08-19 Electric rotary actuator Expired - Lifetime EP0432181B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830114A DE3830114A1 (en) 1988-09-05 1988-09-05 ELECTRIC ROTARY CONTROL
DE3830114 1988-09-05

Publications (2)

Publication Number Publication Date
EP0432181A1 true EP0432181A1 (en) 1991-06-19
EP0432181B1 EP0432181B1 (en) 1992-11-11

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ID=6362310

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Application Number Title Priority Date Filing Date
EP89909163A Expired - Lifetime EP0432181B1 (en) 1988-09-05 1989-08-19 Electric rotary actuator

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EP (1) EP0432181B1 (en)
DE (2) DE3830114A1 (en)
WO (1) WO1990002870A1 (en)

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JPH09511813A (en) * 1995-02-10 1997-11-25 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Device for actuating the control member
US5870010A (en) * 1996-11-15 1999-02-09 U.S. Philips Corporation Actuator with minimized auxiliary magnet, and throttle device provided with such an actuator
KR19980081760A (en) * 1997-04-28 1998-11-25 요트.게.아.롤페즈 Electric actuators with stabilizing static magnetic torque, and throttle devices with such actuators

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Also Published As

Publication number Publication date
EP0432181B1 (en) 1992-11-11
DE58902723D1 (en) 1992-12-17
WO1990002870A1 (en) 1990-03-22
DE3830114A1 (en) 1990-03-15

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