Electromagnet Position Detection via Coil Voltage Pulse
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Solution Overview
Problem
Existing methods for determining the position of an object relative to an electromagnet require significant design effort, additional space, and increased costs due to the need for additional sensors or complex sensor systems.
Innovation Solution
A method and device that utilize a controllable switching element to temporarily disconnect the magnetic coil from the supply voltage, generating a voltage pulse whose time profile depends on the object's position, which is then evaluated to determine the object's position without requiring additional sensors or a double-coil system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors (Hall sensors, single-coil displacement sensors) are used to detect armature position, then position detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The magnetic coil serves dual functions: generating the magnetic field necessary for electromagnet operation and simultaneously acting as a sensor coil for position detection. By measuring the voltage curve and current characteristics of the same coil used for actuation, the system obtains position information without requiring separate sensor components.
Solution Approach 2:
The electromagnet's own magnetic coil provides the sensing function that would otherwise require external sensors. The coil's electrical characteristics (voltage curve, current) inherently contain position information, allowing the system to self-diagnose armature position without additional measurement devices.
2Measurement precision
If additional sensors are integrated into the electromagnet, then position detection capability is improved, but the space required on the electromagnet increases
Solution Approach 1:
The magnetic coil serves dual functions: generating the magnetic field necessary for electromagnet operation and simultaneously acting as a sensor coil for position detection. By measuring the voltage curve and current characteristics of the same coil used for actuation, the system obtains position information without requiring separate sensor components.
3Measurement precision
If a double-coil system is implemented for sensorless position detection, then position detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The magnetic coil serves dual functions: generating the magnetic field necessary for electromagnet operation and simultaneously acting as a sensor coil for position detection. By measuring the voltage curve and current characteristics of the same coil used for actuation, the system obtains position information without requiring separate sensor components.
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
Enables accurate and cost-effective position determination of an object relative to the electromagnet, using the magnetic coil's inductance change to generate a voltage pulse that can be evaluated remotely, reducing implementation complexity and energy consumption.
Implementation Method 1
an electromagnet has a magnetic coil through which electric current can flow and the magnetic field generated by the current-carrying magnetic coil acts on the object
Implementation Method 2
the magnetic coil generates a voltage pulse, the time profile of which depends on the position of the object in relation to the magnetic coil
Data Source
Figure 1a~2
Figure 3~5
AI summary
The method involves allowing current to flow through a magnetic coil (2), where the current creates a magnetic field in the magnetic coil. A controllable switching element (S-1) is arranged in a discharge line (4) of the magnetic coil. The switching element allows separation of the magnetic coil by a supply voltage during a time period. A voltage pulse (U-I) is generated in the magnetic coil, and time course of the pulse corresponds to a location of an object. The voltage pulse is transmitted to an evaluation unit (5) for determination of position of the object. Independent claims are also included for the following: (1) a device for determining position of an object with respect to a magnetic coil of an electromagnet (2) an electromagnet.