Electromagnetic Brake Input Device for Power-Efficient Rotation Control
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Solution Overview
Problem
Conventional input devices with electromagnetic brakes often result in wasteful power consumption and operational discomfort due to unnecessary locking of the operation knob, especially when the rotation direction changes rapidly.
Innovation Solution
An input device comprising a knob, a detector, an electromagnetic brake, and an elastic member, where the controller regulates the electromagnetic brake based on the detected rotation angle and direction, activating it only when necessary to prevent rotation in the regulation direction and allowing rotation in the opposite direction, thereby reducing power consumption and operational discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnetic brake is continuously activated to prevent rotation of the knob, then rotation regulation reliability is improved, but power consumption increases
Solution Approach 1:
The electromagnetic brake is activated periodically rather than continuously. The controller activates the brake only when the knob reaches a target position requiring rotation regulation, and deactivates it when rotation is allowed. This periodic activation maintains regulation reliability when needed while significantly reducing power consumption during normal operation.
Solution Approach 2:
The system dynamically adjusts the brake activation state based on real-time detection of the knob's rotation angle and direction. The controller continuously monitors the knob position and activates or deactivates the electromagnetic brake accordingly, creating a dynamic control system that adapts to operational requirements rather than maintaining a static brake state.
2Measurement precision
If the electromagnetic brake is activated to regulate rotation in the regulation direction, then rotation control precision is improved, but operational comfort deteriorates due to the 'wall' feeling during rapid direction changes
Solution Approach 1:
The controller predicts the operator's intent by detecting the knob's rotation direction and activates the electromagnetic brake in advance when the knob approaches a target position in the regulation direction. This preliminary activation ensures precise rotation control is ready when needed, while avoiding unnecessary activation that would create the 'wall' feeling during rapid direction changes.
Solution Approach 2:
The system uses feedback from the detector to continuously monitor the knob's rotation angle and direction. Based on this feedback, the controller intelligently determines when to activate or deactivate the electromagnetic brake, creating a closed-loop control system that balances rotation precision with operational comfort by responding to actual operator actions rather than maintaining constant brake engagement.
3Ease of operation
If the electromagnetic brake is deactivated to allow free rotation of the knob, then operational comfort is improved, but rotation regulation reliability deteriorates
Solution Approach 1:
The electromagnetic brake operates in a periodic manner, being deactivated during normal operation to allow free knob rotation and improve operational comfort, then activated periodically when the knob reaches a target position requiring rotation regulation. This periodic activation maintains reliability without compromising overall operational comfort.
Solution Approach 2:
The system dynamically switches between deactivated and activated states based on the knob's position and rotation direction. During normal operation, the brake remains deactivated for comfort; when the knob approaches a target position in the regulation direction, the brake is dynamically activated to ensure regulation reliability. This dynamic state adjustment resolves the contradiction between comfort and reliability.
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 solution effectively reduces power consumption by minimizing unnecessary brake activation and enhances operational comfort by providing a controlled rotational experience, allowing smooth transitions between rotation directions without feeling a 'wall' in the regulation direction.
Implementation Method 1
an electromagnetic brake which prevents rotation of the operation knob
Implementation Method 2
the elastic member is bent to allow further rotation of the operation knob
Data Source
AI summary
An input device includes a knob, a detector, an electromagnetic brake, an elastic member, and a controller. The detector detects a rotation angle of the knob. The electromagnetic brake regulates rotation of the knob. The elastic member is provided between the knob and the electromagnetic brake. When the current position of the knob in the circumferential direction is not the target position for rotation regulation of the knob, the controller does not activate the electromagnetic brake. When the current position of the knob in the circumferential direction is the target position for rotation regulation of the knob, the controller determines whether to regulate rotation of the knob based on a rotation direction of the knob, or on a rotation angle of the knob that shifts from the holding position of the knob in the circumferential direction due to deformation of the elastic member.