Pulse Signal Generator Layout for Uniform Magnetic Wire Excitation
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Solution Overview
Problem
Existing pulse signal generators face challenges in size reduction, layout flexibility, and resolution improvement due to limitations in magnetic field application uniformity and efficiency, particularly when using offset layouts and multipole magnets.
Innovation Solution
A pulse signal generator design incorporating a magnetic wire with magnetic flux conducting pieces that include axis-orthogonal and axis-parallel portions, allowing for magnetic field correction and shielding, enabling efficient magnetic field application to the entire wire length, even with reduced distances to magnetic poles, and supporting various magnetic pole configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the distance between the magnetic wire and the magnet is reduced to increase magnetic field strength, then the magnetic field strength is improved, but the magnetic flux enters the axially middle portion of the magnetic wire causing non-uniform magnetic field distribution
Solution Approach 1:
The patent introduces magnetic flux conducting pieces as intermediary components positioned between the magnet and the magnetic wire. These pieces guide and concentrate the magnetic flux toward the opposite ends of the magnetic wire, preventing direct entry into the axially middle portion. This mediator structure enables the system to achieve both strong magnetic field strength and uniform magnetic field distribution simultaneously.
2Force
If magnetic flux conducting pieces are positioned closer to the magnet to increase magnetic field strength, then the magnetic field strength is improved, but the phase difference of pulse signal increases
Solution Approach 1:
The magnetic flux conducting pieces are designed with specific local geometries and positioning arrangements. The pieces are configured to conduct magnetic flux preferentially to specific regions (opposite ends) of the magnetic wire while maintaining appropriate spacing. This local quality control in the magnetic flux conduction path achieves both strong magnetic field strength and minimal phase difference in the generated pulse signal.
3Volume of moving object
If the size of the generator is reduced, then the compactness is improved, but the uniformity of magnetic field application to the entire wire length deteriorates
Solution Approach 1:
The patent introduces magnetic flux conducting pieces that extend in the axial direction of the magnetic wire, creating a three-dimensional magnetic flux conduction path. This dimensional arrangement allows the magnetic flux to be distributed uniformly along the entire length of the magnetic wire even when the overall generator size is reduced. The axial extension of the conducting pieces ensures that magnetic flux reaches all portions of the wire uniformly.
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 size reduction, improved resolution, and flexible layout by ensuring uniform magnetic field application, enabling higher output pulse signals and adaptability to different magnetic pole arrangements without increasing the size of the generator.
Implementation Method 1
Magnetic wires having a large Barkhausen effect (large Barkhausen jump) are known in the name of Wiegand wire or pulse wire... When the hard layer and the soft layer are magnetized in the same direction axially of the wire and the strength of an external magnetic field applied in a direction opposite to that magnetization direction is increased to a certain magnetic field strength, the magnetization direction of the soft layer is reversed. The reversal of the magnetization direction starts at a certain position of the magnetic wire to propagate to the entire wire, whereby the magnetization direction of the soft layer is totally reversed. At this time, the large Barkhausen effect is exhibited to induce a pulse signal in the coil wound around the magnetic wire.
Implementation Method 2
A power generation sensor is produced by winding a coil around the magnetic wire... When the hard layer and the soft layer are magnetized in the same direction axially of the wire and the strength of an external magnetic field applied in a direction opposite to that magnetization direction is increased to a certain magnetic field strength, the magnetization direction of the soft layer is reversed. The reversal of the magnetization direction starts at a certain position of the magnetic wire to propagate to the entire wire, whereby the magnetization direction of the soft layer is totally reversed. At this time, the large Barkhausen effect is exhibited to induce a pulse signal in the coil wound around the magnetic wire.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4
AI summary
A pulse signal generator (1) includes a power generation sensor (100) and a magnetic field generation source (400). The power generation sensor (100) includes a magnetic wire (110) that is caused to exhibit a large Barkhausen effect by an alternating magnetic field applied thereto in an axis direction (x), a coil (120) wound around the magnetic wire (110), and a pair of magnetic flux conducting pieces (130, 131) magnetically coupled to the opposite ends of the magnetic wire (110). The pair of magnetic flux conducting pieces (130, 131) include a pair of axis-orthogonal portions (133) extending parallel to each other in an axis-orthogonal direction (z) orthogonal to the axis direction (x), and a pair of axis-parallel portions (134) extending toward each other in the axis direction (x) from the distal ends of the axis-orthogonal portions (133). The power generation sensor (100) is configured to have a detection region (140) on a side of the axis-parallel portions (134) opposite from the magnetic wire (110). The magnetic field generation source (400) has a magnetic pole that is moved along a track (30) extending through the detection region (140) by relative movement thereof with respect to the power generation sensor (100).