Inductive Blade Position Sensing for Electric Shearing Tools
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Solution Overview
Problem
Existing electric shearing tools using Hall element induction magnets face challenges in mounting convenience and linearity due to the need to identify the S or N pole of the magnet, and require complex mathematical calculations for blade position control, making random movement difficult.
Innovation Solution
A signal generator based on inductance characteristics, comprising a base plate, manual actuator, air core inductor, and magnetizer, where the manual actuator moves to change the relative distance between the magnetizer and air core inductor, altering the inductance value linearly, allowing for precise blade position control through an inductance type transducer and control processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a Hall element induction magnet is used to control blade position, then blade position control is achieved, but mounting convenience deteriorates due to the need to identify S or N pole of the magnet
Solution Approach 1:
The patent replaces the Hall element induction magnet (electromagnetic system) with an inductance type transducer that uses a coil and movable magnetic member (mechanical system). This substitution eliminates the need to identify magnetic poles during mounting, as the inductance change is directly proportional to the displacement of the magnetic member, providing linear output without complex mathematical calculations.
Solution Approach 2:
The patent changes the measurement parameter from voltage output (Hall element) to inductance change (inductance type transducer). The inductance L is given by L = N²μA/l, where μ (magnetic permeability) changes as the magnetic member moves, creating a linear relationship between displacement and inductance value. This parameter change simplifies the control system and improves mounting convenience.
2Measurement precision
If a Hall element induction magnet is used to control blade position, then blade position control is achieved, but control precision deteriorates due to the need for complex mathematical calculations
Solution Approach 1:
The patent replaces the Hall element induction magnet (electromagnetic system) with an inductance type transducer that uses a coil and movable magnetic member (mechanical system). This substitution eliminates the need to identify magnetic poles during mounting, as the inductance change is directly proportional to the displacement of the magnetic member, providing linear output without complex mathematical calculations.
Solution Approach 2:
The patent changes the measurement parameter from voltage output (Hall element) to inductance change (inductance type transducer). The inductance L is given by L = N²μA/l, where μ (magnetic permeability) changes as the magnetic member moves, creating a linear relationship between displacement and inductance value. This parameter change simplifies the control system and improves mounting convenience.
3Ease of operation
If a Hall element induction magnet is used to control blade position, then blade position control is achieved, but ease of operation deteriorates due to difficulty in achieving random movement
Solution Approach 1:
The patent replaces the Hall element induction magnet (electromagnetic system) with an inductance type transducer that uses a coil and movable magnetic member (mechanical system). This substitution eliminates the need to identify magnetic poles during mounting, as the inductance change is directly proportional to the displacement of the magnetic member, providing linear output without complex mathematical calculations.
Solution Approach 2:
The patent changes the measurement parameter from voltage output (Hall element) to inductance change (inductance type transducer). The inductance L is given by L = N²μA/l, where μ (magnetic permeability) changes as the magnetic member moves, creating a linear relationship between displacement and inductance value. This parameter change simplifies the control system and improves mounting convenience.
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 solution improves mounting convenience and precision in blade position control by eliminating the need to identify magnetic poles and simplifying calculations, enabling linear changes in inductance values for accurate blade movement and shear opening degree adjustment.
Implementation Method 1
the air core inductor and the magnetizer are respectively connected to the two fixed portions; and the magnetizer is plugged along a middle portion of the air core inductor or is separated along the middle portion of the air core inductor through the movement of the two fixed portions close to each other or away from each other
Data Source
AI summary
The present disclosure discloses a signal generator based on inductance characteristics of an element, an electric shearing tool, and a shear opening degree control method for an electric shearing tool, and relates to the technical field of electric shearing tools. A changeable inductance value of an inductance type transducer is obtained through a change in a relative position between a triggering member and the inductance type transducer. The inductance value is increased or decreased linearly, so that a control processor can precisely obtain relative position information between the triggering member and the inductance type transducer according to linear changes of the inductance value, thereby obtaining position information of a blade travel control member. Each position point can be mapped to current positions of blades.