Electromechanical Actuator With Bistable Magnetic Mode Switching
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Solution Overview
Problem
Existing electromechanical actuators for concealment devices, such as Venetian blinds, face challenges with complex mechanical devices that are difficult to install and maintain, and magnetic switches that are unstable and prone to false triggering due to vibrations, making them unreliable for switching between operating modes.
Innovation Solution
A compact and reliable electromechanical actuator design featuring a tilt control device with a permanent magnet and Hall effect sensor, integrated into the actuator, which ensures stable operation and easy integration, using a bistable shutter mechanism to maintain position stability and prevent false activations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical device with gears is used to control switching between operating modes, then the device is reliable and stable in position, but the device complexity increases and installation becomes difficult
Solution Approach 1:
The patent replaces complex mechanical switching devices with magnetic field-based detection. A permanent magnet is mounted on the output shaft, and a magnetic sensor detects its position to determine operating modes, eliminating gears and mechanical linkages while maintaining reliable switching between normal and learning modes
Solution Approach 2:
The patent introduces a permanent magnet as an intermediary element that transmits positional information from the output shaft to the magnetic sensor without direct mechanical contact. This intermediary enables mode detection through magnetic field interaction rather than mechanical coupling, reducing complexity while preserving reliability
2Device complexity
If a magnetic switch is used to reduce device complexity, then the device becomes more compact and easier to install, but the reliability decreases due to vibration-induced false switching
Solution Approach 1:
The patent replaces contact-based magnetic switches with non-contact magnetic field sensing. The magnetic sensor detects the position of the permanent magnet on the output shaft without physical contact, eliminating the bouncing and false triggering problems associated with mechanical switches while maintaining compact design
Solution Approach 2:
The permanent magnet mounted on the output shaft serves dual purposes: it indicates the operating mode through its position relative to the magnetic sensor, and it provides inherent mechanical stability through its fixed mounting on the rotating shaft, eliminating the need for separate stabilization mechanisms
3Reliability
If the permanent magnet is mounted on the output shaft, then the magnetic field detection becomes more stable and reliable, but the risk of the magnet detaching increases
Solution Approach 1:
The patent enhances the local mounting structure at the magnet attachment point with reinforced features such as countersunk holes, recesses, or interference-fit geometries. These localized structural enhancements provide strong mechanical retention while keeping the rest of the output shaft design simple and maintaining the magnetic field detection functionality
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
The solution provides a stable and reliable switching mechanism between operating modes, enhancing the reliability and ease of integration of the electromechanical actuator, reducing the risk of false activations and improving the overall performance of concealment devices.
Implementation Method 1
a magnetic sensor configured to detect a position of the permanent magnet
Data Source
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AI summary
An electromechanical actuator includes an electric motor, an electronic control unit (19), and a toggle control device (25) for switching the electronic control unit (19) between first and second operating modes. The toggle control device (25) includes a flap (26), pivoting relative to a housing (17F) between first and second positions, a permanent magnet (27) mounted on the flap (26), and a magnetic sensor (28) for detecting the position of the permanent magnet (27). The flap (26) includes a retaining tab (268) in position relative to the housing (17F) in each of the first and second positions of the flap (26), such that each of the first and second positions of the flap (26) is stable.