Wiegand Sensor Coil Triggering for Synchronized Magnetic Field Detection
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Solution Overview
Problem
Existing magnet-based sensor systems for detecting the movement of a moving object face challenges in reliability, energy efficiency, and cost-effectiveness due to varying trigger field strengths of Wiegand wires and the need for complex control electronics to ensure all wires trigger simultaneously.
Innovation Solution
A sensor device with a Wiegand trigger unit and a sensor coil connected to a coil assembly, where a voltage pulse from the trigger unit energizes the trigger element, generating a trigger magnetic field that ensures all Wiegand wires trigger simultaneously, eliminating the need for complex control electronics and external power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple Wiegand wires are used in the sensor device, then the electrical energy generated increases, but the wires trigger at different angular positions due to varying trigger field strengths, distorting measurement results
Solution Approach 1:
The patent applies preliminary action by using the first Wiegand wire to generate a trigger magnetic field before the other wires are exposed to the external magnetic field. This trigger field is generated in advance by the coil assembly when the first wire triggers, ensuring that subsequent wires experience a combined field that exceeds their individual trigger thresholds, thereby synchronizing their activation and preventing measurement distortion.
2Reliability
If control electronics are added to synchronize Wiegand wire triggering, then measurement reliability improves, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent implements self-service by enabling the sensor device to automatically synchronize wire triggering through the magnetic field interaction among Wiegand wires themselves. The first triggering wire generates a magnetic field that automatically triggers the subsequent wires without requiring external control electronics, switching elements, or complex control circuits, thereby maintaining simplicity while ensuring reliable simultaneous activation.
3Reliability
If control electronics and switching elements are used to manage trigger field generation, then triggering synchronization improves, but energy consumption increases
Solution Approach 1:
The system uses the energy generated by the first Wiegand wire during its triggering event to power the coil assembly and generate the trigger magnetic field for subsequent wires. This self-powered approach eliminates the need for external power supplies or additional energy-consuming control electronics, achieving synchronized triggering without increasing overall energy consumption.
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 enables a reliable, energy-efficient, and cost-effective magnet-based sensor system that detects movement without an external power supply by ensuring consistent electrical energy generation and simultaneous wire triggering.
Implementation Method 1
Reversing the magnetization direction of a Wiegand wire is hereinafter also referred to as 'triggering' the Wiegand wire. The voltage pulses generated in the coil assembly can be evaluated by downstream electronics
Implementation Method 2
an excitation device with at least one excitation magnet for generating an excitation magnetic field, wherein either the sensor device or the excitation device is configured to be connected to the movable object
Data Source
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AI summary
A sensor device (10; 110; 210; 310; 410) for detecting a magnetic field, having a Wiegand sensor unit (12; 112; 212) comprising: • - at least two Wiegand wires (20) and • - a coil assembly (22; 122; 222) which radially surrounds the at least two Wiegand wires (20) and forms • • • a sensor element (26; 126; 226) and • • a trigger element (28; 128; 228) by means of which a trigger magnetic field can be generated, is known. In order to make possible a magnet-based sensor system (300; 400) for detecting a movement of a movable object (301; 401) which operates reliably and energy-efficiently without an external power supply and can be produced cost-effectively, a Wiegand trigger unit (14; 14a) is present in the sensor device (10; 110; 210; 310; 410) according to the invention and comprises: • - a Wiegand wire (30) and • - a trigger sensor coil (32) which radially surrounds the Wiegand wire (30), wherein a first end of the trigger sensor coil (32) of the Wiegand trigger unit (14; 14a) is electrically connected to a first end of the trigger element (28; 128; 228) of the Wiegand sensor unit (12; 112; 212), and a second end of the trigger sensor coil (32) of the Wiegand trigger unit (14; 14a) is electrically connected to a second end of the trigger element (28; 128; 228) of the Wiegand sensor unit (12; 112; 212). In this way, a pulse generated in the trigger sensor coil (32) amplifies the overall magnetic field acting on the Wiegand wires (20) in the sensor unit such that the trigger field strength of all the Wiegand wires (20) is exceeded and the latter are triggered substantially simultaneously.