Pan-Tilt Rotation Sensing Using Electromagnetic Induction
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Solution Overview
Problem
Existing pan-tilt systems using stepper motors have poor precision in measuring rotation angle and speed due to out-of-step phenomena, leading to inefficient and inaccurate control of the pan-tilt head.
Innovation Solution
A pan-tilt system with a magnetic-field generating apparatus on the base and a conductor rod on the head, where the conductor rod cuts magnetic induction lines to generate an induced electromotive force proportional to the rotation angular velocity, allowing for precise measurement and control of the pan-tilt head's rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stepper motor is used to drive the pan-tilt head, then the structure is simple and cost-effective, but the measurement precision of rotation angle and rotation speed deteriorates due to out-of-step phenomena
Solution Approach 1:
The patent replaces the stepper motor's mechanical step-counting method with an electromagnetic induction-based detection system. A magnetic field generating device and conductor rod form a detection mechanism that uses electromagnetic induction to generate signals proportional to rotation speed and angle, eliminating the out-of-step phenomena inherent in mechanical stepper motors while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the rotating pan-tilt head and the detection system. The magnetic field generated by the magnetic field generating device interacts with the conductor rod to produce induced electromotive force, which serves as a mediator to accurately transmit rotation information without direct mechanical coupling, thereby improving measurement precision.
2Device complexity
If stepper motor step counting is used to estimate rotation angle, then the device complexity is low, but the reliability of rotation angle measurement deteriorates due to over-rotation cases
Solution Approach 1:
The patent implements a feedback mechanism where the magnetic field generating device and conductor rod continuously generate electromagnetic signals that reflect the actual rotation state. These signals provide real-time feedback on rotation angle and speed, allowing the system to detect and correct over-rotation cases, thereby improving measurement reliability without significantly increasing device complexity.
3Device complexity
If traditional stepper motor control is used, then the control system is simple, but the productivity deteriorates due to inability to obtain real-time rotation speed
Solution Approach 1:
The patent enables the pan-tilt head to self-measure its own rotation speed and angle through the electromagnetic induction mechanism. The conductor rod cutting magnetic induction lines during rotation automatically generates induced electromotive force that directly reflects the rotation state, eliminating the need for external sensors or complex measurement systems, thus improving productivity while keeping control system complexity low.
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 achieves high precision and efficient control of the pan-tilt head's rotation, enabling accurate and quick adjustment of the photographing angle, and allows continuous rotation beyond 0 degrees, improving timeliness and measurement precision.
Implementation Method 1
in a process of the pan-tilt head rotating relative to the pan-tilt base, the conductor rod cuts magnetic induction lines of the detection magnetic field and generates an induced electromotive force
Data Source
AI summary
Embodiments of this application provide a pan-tilt, a method for controlling a pan-tilt, and a photographing apparatus. A magnetic-field generating apparatus for generating uniform detection magnetic field is mounted on a pan-tilt base of the pan-tilt, a conductor rod is mounted on a pan-tilt head of the pan-tilt, and two ends of the conductor rod are electrically connected to a voltage detection unit. In this way, in a process of the pan-tilt head rotating relative to the pan-tilt base, the conductor rod cuts magnetic induction lines of the detection magnetic field and generates an induced electromotive force. In addition, in the embodiments of this application, the induced electromotive force on the two ends of the conductor rod can be detected through the voltage detection unit. It can be understood that the induced electromotive force is directly proportional to a rotation angular velocity of the conductor rod, that is, is directly proportional to a rotation angular velocity of the pan-tilt head, so that the rotation angular velocity of the pan-tilt head can be obtained, and a technical problem that an existing pan-tilt cannot measure a rotation speed is resolved, wherein the structure is simple and easy to implement, and is convenient to use.