Actuator Vibration Filtering via Segmented Couplings
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Solution Overview
Problem
Existing electromechanical actuators for solar protection installations experience noise due to vibrations and suffer from creep or relaxation in elastic couplings, leading to angular position shifts and visually perceptible offsets between screens.
Innovation Solution
The actuator design incorporates a motor assembly with rigid transmission couplings and elastic modules, allowing movement perpendicular to the longitudinal axis, which limits displacement and prevents direct contact between the motor assembly and the casing, while using Oldham or Schmidt joints to filter vibrations, eliminating the need for torsionally elastic elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If elastic couplings are used to connect the motor assembly, then vibration isolation is achieved, but creep and relaxation occur leading to angular position shifts
Solution Approach 1:
The vibration isolation function is segmented from the torque transmission function. The rigid coupling provides pure torque transmission while a separate elastic element (spring or damper) handles vibration isolation, eliminating the creep issue inherent in elastic couplings that combine both functions.
Solution Approach 2:
An intermediary elastic element (spring or damper) is introduced between the motor assembly and the rigid coupling. This mediator absorbs vibrations without being part of the torque transmission path, preventing angular position shifts while still providing vibration isolation.
2Reliability
If rigid transmission couplings are used, then angular position accuracy is maintained, but vibrations are transmitted to the housing
Solution Approach 1:
An intermediary elastic element (spring or damper) is placed between the motor assembly and the rigid coupling to absorb vibrations before they reach the housing, while the rigid coupling itself maintains angular position accuracy for torque transmission.
Solution Approach 2:
The system uses different coupling characteristics at different locations: a rigid coupling at the torque transmission interface to maintain angular accuracy, and a localized elastic element (spring or damper) at the vibration source to isolate vibrations from the housing.
3Object-affected harmful factors
If elastic modules are added to limit motor assembly displacement, then vibration filtering is improved, but device complexity increases
Solution Approach 1:
The elastic element's parameters (stiffness, damping coefficient) are optimized to provide effective vibration filtering with minimal displacement limitation, achieving the desired vibration isolation without excessive complexity in the actuator structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces noise and prevents angular position shifts, ensuring precise alignment and operation of solar protection screens by cutting off radial vibrations and maintaining torsional rigidity, thus enhancing the reliability and performance of the actuator.
Implementation Method 1
at least one elastic module limiting the displacement of the motor assembly along the plane perpendicular to the longitudinal axis of the electromechanical actuator
Implementation Method 2
having at least one first degree of freedom perpendicular to the longitudinal axis of the electromechanical actuator, allowing displacement of the motor assembly along a plane perpendicular to the longitudinal axis
Implementation Method 3
a first mechanical vibration filtering module, a second mechanical vibration filtering module... each comprising a rigid transmission coupling
Data Source
Figure 1~2
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AI summary
The invention relates to an electromechanical actuator (11) for a closure, obscuring or solar protection installation (6), the electromechanical actuator (11) comprising a motor assembly (16), comprising an electric motor (261) and a reduction gearbox (265), a first mechanical module (33) for filtering vibrations, a second mechanical module (133) for filtering vibrations, and an output shaft (20), which are inserted at least partially in a casing (17) of the electromechanical actuator (11), the electromechanical actuator (11) extending along a longitudinal axis (X), the first and the second mechanical modules (33, 133) for filtering vibrations being disposed on either side of the motor assembly (16) along the longitudinal axis (X) and each comprising a rigid transmission coupling, which has at least a first degree of freedom perpendicularly to the longitudinal axis (X) of the electromechanical actuator (11), allowing the motor assembly (16) to move along a plane perpendicular to the longitudinal axis (X) of the electromechanical actuator (11), the electromechanical actuator also comprising at least one elastic module (130) that limits the movement of the motor assembly (16) along the plane perpendicular to the longitudinal axis (X) of the electromechanical actuator (11).