EP0432181B1 - Electric rotary actuator - Google Patents

Electric rotary actuator Download PDF

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Publication number
EP0432181B1
EP0432181B1 EP89909163A EP89909163A EP0432181B1 EP 0432181 B1 EP0432181 B1 EP 0432181B1 EP 89909163 A EP89909163 A EP 89909163A EP 89909163 A EP89909163 A EP 89909163A EP 0432181 B1 EP0432181 B1 EP 0432181B1
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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.)
Expired - Lifetime
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EP89909163A
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German (de)
French (fr)
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EP0432181A1 (en
Inventor
Corneliu Lungu
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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 actuating element, in particular a throttle valve in the air intake pipe of an internal combustion engine, of the type defined in the preamble of claim 1 (cf. US-A-3991332).
  • Such a rotary actuator is described for example in the unpublished document DE-OS 37 43 309.
  • E-gas rotary actuators it is essential that if the power supply fails, the rotary actuator returns to its initial 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.
  • a return spring adversely affects the useful torque available on the actuating shaft.
  • a stepper motor with a permanent magnet rotor is known, which is fed with pulses of alternating direction to generate a rotation on the output shaft.
  • the two stator poles of this known arrangement are symmetrical with the same Pole width, but arranged offset to each other to generate a variable air gap.
  • the rotor poles are symmetrical and arranged and extend over a circumferential angle of a maximum of 90 °.
  • the turntable according to the invention with the characterizing features of claim 1 has the advantage that a maximum magnetic flux change is caused by the asymmetrical design of the stator and rotor poles in the manner mentioned within the specified rotation angle range of the rotor, which generally leads to high efficiency.
  • the torque curve can be dimensioned specifically depending on the angle of rotation.
  • the air gap is additionally formed asymmetrically in such a way 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 maximum in the end position reached by excitation of the stator, then occurs in the end position of the rotor after switching off the stator excitation 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 by a dash-dotted line in the drawing. 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 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 pronounced stator poles 13, 14 which are designed asymmetrically with pole widths which 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 enclosed by a coil 18 with a single-strand excitation winding 19 which is supplied with a DC current of a predetermined size for the desired rotation of the rotor 12.
  • the polarity of the excitation winding 19 is selected 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 to the actuating shaft 10 in a rotationally fixed manner, 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 South pole forming stator pole 14 is located.
  • 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 radially different 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 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 °.

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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)

Abstract

An electric actuator for driving a regulating element, in particular a throttle arranged in the air intake pipe of an internal combustion engine, has a direct current-excited bipolar stator (11) and a permanent magnetic bipolar rotor (12). In order to increase its efficiency and to obtain a torque curve that can be measured according to angular position, both stator poles (13, 14) are asymmetrically shaped and the rotor poles (20, 21) are asymmetrically arranged at the rotor (12) and extend over a circumferential angle greater than 90°.

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen elektrischen Drehsteller zum Antrieb eines Stellelements, insbesondere einer Drosseklappe im Luftansaugrohr einer Brennkraftmaschine, der im Oberbegriff des Anspruchs 1 definierten Gattung (vgl. US-A-3991332).The invention relates to an electric rotary actuator for driving an actuating element, in particular a throttle valve in the air intake pipe of an internal combustion engine, of the type defined in the preamble of claim 1 (cf. US-A-3991332).

Ein solcher Drehsteller ist beispielsweise in der nicht vorveröffentlichten Schrift 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 des Luftansaugrohrs weitgehend verschließt.Such a rotary actuator is described for example in the unpublished document 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 initial position, in which the throttle valve largely closes the cross section of the air intake pipe.

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.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.

Aus der US-A 3 991 332 ist ein Schrittmotor mit Permanentmagnetrotor bekannt, welcher mit Impulsen wechselnder Richtung gespeist wird zur Erzeugung einer Rotation an der Abtriebswelle. Die beiden Statorpole dieser bekannten Anordnung sind symmetrisch ausgebildet mit gleicher Polbreite, jedoch zur Erzeugung eines veränderlichen Luftspaltes versetzt zueinander angeordnet. Die Rotorpole sind symmetrisch ausgebildet und angeordnet und erstrecken sich über einen Umfangswinkel von maximal 90°.From US-A 3 991 332 a stepper motor with a permanent magnet rotor is known, which is fed with pulses of alternating direction to generate a rotation on the output shaft. The two stator poles of this known arrangement are symmetrical with the same Pole width, but arranged offset to each other to generate a variable air gap. The rotor poles are symmetrical and arranged and extend over a circumferential angle of a maximum of 90 °.

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 maximale Magnetflußänderung bewirkt wird, was grundsätzlich zu einem hohen Wirkungsgrad führt. Der Drehmomentenverlauf kann dabei gezielt drehwinkelabhängig bemessen werden.The turntable according to the invention with the characterizing features of claim 1 has the advantage that a maximum magnetic flux change is caused by the asymmetrical design of the stator and rotor poles in the manner mentioned within the specified rotation angle range of the rotor, which generally leads to high efficiency. The torque curve can be dimensioned specifically 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 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 in such a way 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 maximum in the end position reached by excitation of the stator, then occurs in the end position of the rotor after switching off the stator excitation 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 Umfangsrichtung 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 structural 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.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 by a dash-dotted line in the drawing. 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.

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 Umfangsrichtung 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 gewünschten Verdrehung des Rotors 12 mit einem Gleichstrom vorgegebener Größe bestromt 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.In a known manner, the rotary actuator consists 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 pronounced stator poles 13, 14 which are designed asymmetrically with pole widths which 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 enclosed by a coil 18 with a single-strand excitation winding 19 which is supplied with a DC current of a predetermined size for the desired rotation of the rotor 12. The polarity of the excitation winding 19 is selected 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.

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 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, 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 bildenden Statorpols 14 liegt.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 to the actuating shaft 10 in a rotationally fixed manner, 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 South pole forming stator pole 14 is located.

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 radially different 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 die 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°.In 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 also measured in the circumferential direction likewise about 130 ° and the pole width of the stator pole 14 with the larger pole width 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 °.

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.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 effected within the predetermined angle of rotation 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 adjusting shaft 10 Return spring for the rotor 12 can be omitted.

Claims (7)

  1. Electrical rotary actuator for driving an actuating element, especially a throttle valve in the air induction pipe of an internal-combustion engine, having a stator which has a DC excitation winding and two stator poles, and having a rotor which can rotate between the stator poles, is firmly connected to an actuating shaft and supports two permanent-magnet rotor poles, which are magnetised in opposite directions and are located opposite the stator poles, leaving an air gap, characterised in that the two stator poles (13, 14) are constructed asymmetrically with pole widths deviating greatly from each other, measured in the circumferential direction, and in that the rotor poles (20, 21) each extend over a circumferential angle of more than 90° and are arranged asymmetrically on the rotor (12) in such a manner that they are closer to each other on the one axial longitudinal sides than on the other axial longitudinal sides.
  2. Rotary actuator according to Claim 1, characterised in that the pole width, measured in the circumferential direction, of the stator pole (13) having the smaller pole width is approximately equal to the angular extent of the rotor poles (20, 21).
  3. Rotary actuator according to Claim 2, characterised in that the rotor poles (20, 21) virtually abut along their axial longitudinal side and extend over approximately 120° to 130°, and in that the pole width of the stator pole (13) having the smaller pole width is approximately 120° to 130°, and the pole width of the stator pole (14) having the greater pole width is approximately 230°.
  4. Rotary actuator according to one of Claims 1 to 3, characterised in that the rotor poles (20, 21) are constructed as shell-shaped permanent-magnetic segments (22, 23) and are seated on a support (24) which is connected in a rotationally fixed manner to the actuating shaft (10) and consists of soft-magnetic material.
  5. Rotary actuator according to one of Claims 1 to 4, characterised in that the air gap (25) is constructed asymmetrically in such a manner that there is an enlarged radial air gap width between at least one subsection of a rotor pole and stator pole (20, 14) in one rotation position of the rotor (12), preferably in its position rotated through 90° with respect to the neutral position.
  6. Rotary actuator according to Claim 5, characterised in that, in order to form the asymmetric air gap (25), the pole surface (16) of the stator pole (14) having the greater pole width has a surface section (161) which extends over approximately half the pole width and is set back radially with respect to the remaining surface section (162).
  7. Rotary actuator according to Claim [sic] 3 and 6, characterised in that the set-back pole surface section (161) of the stator pole (14) extends over approximately 100° of the pole width from the pole edge which leads with respect to the rotor rotation.
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
DE3830114 1988-09-05
DE3830114A DE3830114A1 (en) 1988-09-05 1988-09-05 ELECTRIC ROTARY CONTROL

Publications (2)

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

Family

ID=6362310

Family Applications (1)

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

Country Status (3)

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

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4038760A1 (en) * 1990-12-05 1992-06-11 Bosch Gmbh Robert TURNTABLE
DE4038761A1 (en) * 1990-12-05 1992-06-11 Bosch Gmbh Robert TURNTABLE
DE4215011B4 (en) * 1991-05-10 2006-10-12 Papst Licensing Gmbh & Co. Kg Electromagnetic adjustment drive
DE4245077B4 (en) * 1991-05-10 2007-09-27 Papst Licensing Gmbh & Co. Kg Electromagnetic actuator for limited rotary movement - has stator assembly formed from pair of units with stator at centre having permanent magnet elements
FR2688105B1 (en) * 1992-02-28 1994-05-06 Moving Magnet Technologies Sa ELECTROMAGNETIC ROTARY ACTUATOR SINGLE-PHASE RACE BETWEEN 60 AND 120 DEGREES.
DE4226548A1 (en) * 1992-08-11 1994-02-17 Bosch Gmbh Robert Actuator for adjusting the angle of rotation of an actuator
DE4443618C5 (en) * 1993-12-17 2004-02-05 Siemens Ag Angle actuator
DE19504243A1 (en) * 1994-06-10 1995-12-14 Philips Patentverwaltung Device for adjusting an actuator
GB2290911A (en) * 1994-06-28 1996-01-10 Dafydd Roberts Rotary electromagnetic actuator
KR970702423A (en) * 1995-02-10 1997-05-13 제이.지.에이. 롤페스 Device for actuating a control member
WO1996027323A1 (en) * 1995-03-07 1996-09-12 John Dumergue Charters Apparatus for dilating a body cavity
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
JPH118963A (en) * 1997-04-28 1999-01-12 Koninkl Philips Electron Nv Electric actuator with stabilized magnetostatic torque and throttle valve provided with actuator

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Publication number Priority date Publication date Assignee Title
US2909685A (en) * 1955-08-08 1959-10-20 Ericsson Telefon Ab L M Magnet core for pulse motors
JPS4933111A (en) * 1972-07-31 1974-03-27
GB1596394A (en) * 1976-11-30 1981-08-26 Denki Onkyo Co Ltd Rotary actuator
JPS61169477U (en) * 1985-04-04 1986-10-21
DE3743309A1 (en) * 1987-12-21 1989-06-29 Bosch Gmbh Robert METHOD AND DEVICE FOR DETECTING AND RELAXING CLAMPED CONTROL ELEMENTS

Also Published As

Publication number Publication date
WO1990002870A1 (en) 1990-03-22
EP0432181A1 (en) 1991-06-19
DE58902723D1 (en) 1992-12-17
DE3830114A1 (en) 1990-03-15

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