Stage Light Angular Detector Using Electromagnetic Coupling Feedback
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Solution Overview
Problem
Current stage light fixtures face positioning accuracy issues due to interference from intense light and magnetic field attenuation, leading to inaccurate light spot alignment, which affects the audience experience.
Innovation Solution
A stage light fixture with a high-stable rotational positioning system using an angular detector featuring a stator assembly with a magnet exciting coil and a rotor assembly, where the rotor assembly changes electromagnetic coupling strength to determine rotation angles, reducing environmental interference and maintaining a stable magnetic field through continuous energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photoelectric encoder is used for rotational positioning, then the positioning system can be implemented, but the positioning accuracy deteriorates due to interference from intense light
Solution Approach 1:
The patent replaces the photoelectric encoder (optical system) with an angular detector based on electromagnetic induction principles. The angular detector uses a stator assembly with a magnet exciting coil and a rotor assembly with metal regions, detecting rotation through changes in electromagnetic coupling strength rather than light signals, thereby eliminating susceptibility to light interference.
Solution Approach 2:
The patent changes the detection parameter from optical signals to electromagnetic coupling strength. The magnet exciting coil generates a magnetic field, and the rotor assembly's metal regions periodically change the electromagnetic coupling strength between the stator and rotor, allowing rotation angle detection through electromagnetic parameters instead of optical parameters.
2Measurement precision
If a magnetic encoder is used for rotational positioning, then the positioning system can be implemented, but the positioning accuracy deteriorates due to rapid magnetic field attenuation under high temperature
Solution Approach 1:
The patent replaces the magnetic encoder with an angular detector that uses electromagnetic induction. The magnet exciting coil continuously generates a magnetic field through high-frequency periodic alternating current, and the detection is based on induced electromotive force in the receiving coil rather than direct magnetic field sensing, making the system less susceptible to temperature-induced magnetic field attenuation.
Solution Approach 2:
The magnet exciting coil receives continuous energy input and maintains a continuous alternating magnetic field, ensuring stable operation under high temperature conditions. The continuous generation of electromagnetic fields through alternating current prevents the magnetic field attenuation issues that plague magnetic encoders in high-temperature environments.
3Measurement precision
If traditional encoders are used for rotational positioning, then the positioning system can be implemented, but the positioning accuracy remains relatively low
Solution Approach 1:
The patent changes from traditional encoder parameters to electromagnetic coupling strength parameters. The angular detector measures rotation angle through the periodic changes in electromagnetic coupling between the stator's magnet exciting coil and the rotor's metal regions, achieving higher precision through electromagnetic induction principles.
Solution Approach 2:
The angular detector provides continuous feedback on the rotation angle through the induced electromotive force signal. The receiving coil detects changes in electromagnetic coupling strength and generates corresponding electrical signals that directly indicate the relative rotation angle, enabling precise closed-loop control.
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 system provides accurate and stable rotational positioning with reduced interference, ensuring precise light beam alignment and enhanced audience experience by maintaining high accuracy and stability.
Implementation Method 1
a magnet exciting coil which is adapted to form an alternating magnetic field in the region of the stator assembly by high-frequency periodic alternating current and voltage
Implementation Method 2
a receiving coil arranged in the alternating magnetic field which is adapted to form an induced electromotive force
Implementation Method 3
The rotor assembly is configured to change electromagnetic coupling strength between the magnet exciting coil and the receiving coil
Data Source
AI summary
A stage light fixture with high-stable rotational positioning including a base, a pivoting arm pivoted to the base through a pivoting shaft, and a light head pivoted to the pivoting arm through another pivoting shaft. An angular detector for detecting a rotation angle of the light head and/or the pivoting arm is further provided, which includes a stator assembly and a rotor assembly oppositely arranged each other, wherein the stator assembly has a magnet exciting coil adapted to form an alternating magnetic field in a region of the stator assembly by high-frequency periodic alternating current and voltage and a receiving coil arranged in the alternating magnetic field adapted to form an induced electromotive force; and the rotor assembly is configured to change electromagnetic coupling strength between the magnet exciting coil and the receiving coil during rotation thereof relative to the stator assembly.