Actuator with open-loop control direct drive
AssigneeMmt SA
InventorsAntoine Foucaut, Pierre Gemberlé, Antoine Bourgade
Life of this patent
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Abstract
Travel of a brushless rotary actuator is limited by two stops, including a wound stator and a magnetic cylindrical rotor rigidly attached to a shaft having a first end rigidly attached to a control member. A second end of the shaft is rigidly attached to a travel limiting part acting as stops, and the travel limiting part has bending, resilient beam shapes. The actuator is electrically controlled in an open-loop. A control system controls a lift value of valves of an internal combustion engine by a lever driven by such an actuator.
Claims18
A brushless rotary actuator comprising:
- two stops;
- a wound stator;
- a magnetic cylindrical rotor;
- a shaft rigidly attached to the rotor, the shaft having a first end and a second end;
- a control member rigidly attached to the first end of the shaft, wherein the control member has a resilient beam configured to damp movement when the rotor reaches an end of travel position;
- and
- a travel limiter rigidly attached to the second end of the shaft, wherein the travel limiter has one or more resilient beams configured to elastically bend when the travel limiter comes into contact with the two stops;
- wherein the actuator is configured to be electrically controlled in an open-loop.
The brushless rotary actuator according to clean 1, wherein the one or more resilient beams of the travel limiter and the control member are made of a material with a ratio between a breaking stress and a modulus of elasticity greater than 0.020 and a Charpy notched impact strength greater than 20 kJ/m2.
A brushless rotary actuator comprising:
- an actuator housing;
- a cover configured to cooperate with the actuator, the cover comprising a stop;
- a shaft having a first end and a second end;
- a stator surrounding at least a portion of the shaft;
- a rotor attached to the shaft proximate to the second end of the shaft;
- and
- a travel limiter proximate to the rotor, the travel limiter comprising:
- a central portion;
- a first arm extending radially away from the central portion;
- a first engaging pad extending in a first axial direction perpendicularly from an end of the first arm;
- a second arm extending radially away from the central portion in a direction opposite the first arm;
- a second engaging pad extending in the first axial direction perpendicularly from an end of the second arm;
- a first pair of curved bridges extending from the central portion, the first pair of curved bridges connecting the first arm to the central portion;
- a second pair of curved bridges extending from the central portion, the first pair of curved bridges connecting the second arm to the central portion;
- a third arm extending radially away from the central portion;
- a first travel limiting pad extending in a second axial direction perpendicularly from an end of the third arm, the second axial direction opposite the first axial direction;
- a fourth arm extending radially away from the central portion;
- and
- a second travel limiting pad extending in the second axial direction perpendicularly from an end of the fourth arm;
- wherein the first engaging pad and the second engaging pad are configured to engage with the rotor;
- and
- wherein the first pair of curved bridges and the second pair of curved bridges are configured to elastically deform when one or more of the first travel limiting pad and the second travel limiting pad contact the stop of the cover.
Dependencies are inferred from the claim text.