Vibration Sensor With Segmented Converter And Air Gap
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Solution Overview
Problem
Existing vibration sensors with converter devices using excitation coils and bolts or magnets suffer from limited magnetic force due to stray fields and are not suitable for high-temperature applications.
Innovation Solution
A vibration sensor design featuring a two-part converter device with a permanent magnet and coil core, an air gap, and a magnetic yoke to enhance driving force, while minimizing stray fields, and using heat-treated materials for high-temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional coil core is used in the converter device, then the structure is simple, but the driving force is limited due to stray fields
Solution Approach 1:
The converter device is divided into two separate parts: a permanent magnet unit and a coil core unit, connected through an air gap. This segmentation allows the permanent magnet to provide a strong static magnetic field while the coil generates dynamic magnetic forces, achieving high driving force while managing stray fields through the air gap configuration
Solution Approach 2:
The converter device combines two different magnetic components (permanent magnet and electromagnet/coil core) with complementary characteristics. The permanent magnet provides high remanence and stable magnetic field, while the coil provides controllable dynamic magnetic force, creating a composite magnetic system with superior overall performance
2Temperature
If standard materials are used in the vibration sensor, then the manufacturing is easier, but the sensor is not suitable for high temperatures
Solution Approach 1:
The oscillating element is subjected to heat treatment that changes its physical parameters, specifically reducing internal stresses and stabilizing its dimensional properties. This heat treatment modifies the material's thermal response characteristics, enabling the element to maintain stable resonant frequency across a wide temperature range from -40°C to +150°C
Solution Approach 2:
The patent addresses thermal expansion effects through heat treatment of the oscillating element, which stabilizes the material's dimensional properties. The heat treatment process modifies the material's thermal response, reducing thermal hysteresis and ensuring that dimensional changes due to temperature variations do not significantly affect the resonant frequency
3Object-generated harmful factors
If a conventional converter device is used, then the structure is compact, but stray fields are generated inside and outside the sensor
Solution Approach 1:
The harmful stray fields are effectively 'taken out' or isolated by introducing an air gap between the permanent magnet and coil core. This air gap acts as a magnetic insulator that contains the magnetic flux within the converter device, preventing stray fields from extending outside the sensor while maintaining the strong magnetic interaction needed for high driving force
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 design achieves a higher driving force and reduced stray fields, making the vibration sensor suitable for high-temperature operations with improved frequency stability and minimized thermal hysteresis.
Implementation Method 1
the permanent magnet and the excitation coil being arranged to interact in such a way that an oscillation of the permanent magnet induces a current flow in the excitation coil and/or a magnetic field inducing current flow in the excitation coil causes a vibration of the permanent magnet
Implementation Method 2
an oscillation of the permanent magnet induces a current flow in the excitation coil and/or a magnetic field inducing current flow in the excitation coil causes a vibration of the permanent magnet
Data Source
Figure 1~2
Figure 3~4
AI summary
Vibration sensor (1) with a support element that can be set into vibration, a transducer device (3) having an excitation coil (2) for setting the support element (5) into vibration and/or for picking up a vibration of the support element (5), a bolt mounted in the excitation coil (2), a vibration element (6) and/or a support element (5) designed as a vibration element for transmitting the vibrations from the support element (5) into a surrounding space and/or from a surrounding space to the support element (5).According to the invention, the bolt is formed in two parts with a permanent magnet (7) and a coil core (8) connected to the excitation coil (2), wherein an air gap (9) arranged between the permanent magnet (7) and the coil core (8) lies in the region of the axial extent of the excitation coil (2), furthermore the permanent magnet (7) is connected to the support element (5) for the transmission of the vibrations, and the excitation coil (2) and the permanent magnet (7) are arranged to interact in such a way that an oscillation of the permanent magnet (7) is induced and/or a current flow in the excitation coil (2) inducing a magnetic field causes an oscillation of the permanent magnet (7).