Wiegand Sensor Rotor With Diametral Magnet
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Solution Overview
Problem
Existing machine components with Wiegand sensors face design constraints and interference issues due to the influence of external magnetic fields and the need for additional magnets, which can cause imbalances and affect the accuracy of rotational movement measurement.
Innovation Solution
A diametral magnet is mounted directly on the axis of rotation, generating a rotating magnetic field that minimizes design influence and balances the rotor, while a Wiegand sensor and optionally Hall sensors are used to measure rotational speed and position with improved signal clarity by deflecting interference fields and optimizing field alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional magnets are attached to rotor blades to improve detection signal, then measurement precision is improved, but device complexity and rotor imbalance increase
Solution Approach 1:
The invention extracts the magnet from the rotor blades and relocates it to the hub, separating the magnetic field generation function from the rotating measurement elements. This simplifies the rotor structure while maintaining measurement precision through the diametral magnet's rotating field.
Solution Approach 2:
The invention merges the magnet with the hub structure, integrating the magnetic field generation into the central component. The diametral magnet mounted on the hub combines field generation with rotational movement, eliminating the need for separate magnets on each blade.
2Measurement precision
If additional magnets are attached to rotor blades to improve detection signal, then measurement precision is improved, but weight distribution and rotor balance worsen
Solution Approach 1:
By extracting the magnets from the rotor blades and concentrating them in the hub, the invention eliminates the weight distribution problems that would arise from multiple magnets on rotating blades, maintaining rotor balance while preserving measurement precision.
3Measurement precision
If Wiegand sensor is used to measure rotational movement, then measurement precision is improved, but susceptibility to interference from external magnetic fields increases
Solution Approach 1:
The invention introduces a magnetically conductive shielding element as an intermediary between external magnetic fields and the Wiegand sensor. This shield deflects interfering fields while allowing the rotating diametral magnet's field to reach the sensor, protecting against harmful interference.
4Device complexity
If diametral magnet is mounted on axis of rotation, then device complexity is reduced, but field alignment optimization becomes more difficult
Solution Approach 1:
The invention applies local quality by creating specific geometric features (inclined surfaces) on the diametral magnet that locally modify the magnetic field distribution. These inclined surfaces ensure proper field alignment in the critical measurement zone while maintaining the simple overall diametral magnet 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 configuration enhances measurement signal quality, reduces imbalances, and minimizes demagnetization effects, allowing for precise detection of rotational movement with reduced interference from external fields.
Implementation Method 1
a permanent magnet in the form of a diametral magnet (3), which rotates about an axis of rotation (R) running through its dividing line between its north and south poles (N, S) to generate a useful magnetic field
Implementation Method 2
The Wiegand sensor is a type of pulsed wire sensor... When an external magnetic field is applied parallel to the Wiegand wire, the magnetization of the corresponding sections changes... Each time sections of the wire flip over, a voltage pulse is induced in the coil
Implementation Method 3
If a coil is arranged around the Wiegand wire along its longitudinal axis, a voltage can be induced in the coil. Each time sections of the wire flip over, a voltage pulse is induced in the coil
Implementation Method 4
The Wiegand sensor is shielded from interfering fields, such as those caused by a brake coil, by means of a shield
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A machine component is proposed, comprising a rotor for performing a rotational movement about an axis of rotation and a co-rotating permanent magnet attached to the rotor for generating a useful magnetic field, a Wiegand sensor for detecting the rotational movement, in particular the position or speed of the rotor, which has a Wiegand wire that is static relative to the rotor and arranged in a plane perpendicular to the axis of rotation. To improve the design, the permanent magnet is configured as a diametral magnet, with the axis of rotation passing through the dividing line between the north and south poles of the diametral magnet, and an influencing element for influencing the useful magnetic field is provided.