Water-Surface Propulsion Steering with Resolver Angle Detection
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Solution Overview
Problem
Existing propulsion devices for water-surface movable bodies lack an efficient mechanism to easily detect the turning angle of the lower case, which is necessary for precise control and improved energy efficiency.
Innovation Solution
A propulsion device with a steering deceleration mechanism and a turning angle detection mechanism that includes a deceleration gear, a detection shaft, and a detection unit, allowing for precise detection of the lower case's turning angle through a resolver system, while maintaining a compact design and reducing noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steering motor and gear mechanism are used to turn the lower case, then the water-surface movable body can be steered, but a complex mechanism is required to detect the turning angle of the lower case
Solution Approach 1:
The patent introduces a detection shaft as an intermediary element that connects to the gear shaft through a connection unit. This detection shaft serves as a mediator that transfers the rotational motion from the steering mechanism to the detection unit, enabling turning angle detection without requiring direct access to the complex gear mechanism internals.
Solution Approach 2:
The patent replaces complex mechanical angle detection methods with an electromagnetic detection system. The detection unit (likely a resolver or encoder) uses electromagnetic fields to detect the rotation angle of the detection shaft, substituting mechanical linkages and sensors with a more compact electromagnetic detection approach.
2Speed
If multiple deceleration gears are used in the steering deceleration mechanism, then the steering motor can be adequately decelerated, but the number of components increases
Solution Approach 1:
The patent merges the functions of multiple deceleration gears into a single integrated deceleration mechanism. By combining the gear teeth and structure of what would traditionally require multiple separate gears into one unified component, the patent achieves the necessary deceleration ratio while reducing the total number of discrete components in the steering system.
3Volume of stationary object
If the turning angle detection mechanism is placed in the oil chamber with deceleration gears, then space is saved, but noise from the gears interferes with the detection
Solution Approach 1:
The patent segments the internal space of the upper case into two distinct chambers: an oil chamber for housing the deceleration gears and a dry chamber for accommodating the turning angle detection mechanism. This spatial segmentation isolates the noise-generating mechanical components from the sensitive detection system, eliminating noise interference while maintaining compact overall dimensions.
Solution Approach 2:
The patent extracts the turning angle detection mechanism from the oil-filled environment and places it in a separate dry chamber. This extraction removes the detection mechanism from the harmful oil environment and noise source, allowing it to operate in a cleaner, quieter area while the deceleration gears continue to function in the oil chamber for proper lubrication.
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 easy and accurate detection of the turning angle of the lower case, improving control precision and energy efficiency by reducing the number of deceleration gears and accommodating the detection mechanism in a dry chamber to prevent noise interference.
Implementation Method 1
the turning angle detection mechanism includes: a detection shaft (165) provided separately from a gear shaft (123) of the at least one deceleration gear; a connection unit (166) that connects the gear shaft of the at least one deceleration gear and the detection shaft; and a detection unit (168) configured to detect a rotation angle of the detection shaft
Data Source
AI summary
A propulsion device for a water-surface movable body includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case, a propulsor supported by the lower case, a steering motor accommodated in the upper case, a steering deceleration mechanism configured to decelerate rotation of the steering motor, and a turning angle detection mechanism configured to detect a turning angle of the lower case. The steering deceleration mechanism includes a deceleration gear, the turning angle detection mechanism includes a detection shaft provided separately from a gear shaft of the deceleration gear, a connection unit that connects the gear shaft of the deceleration gear and the detection shaft, and a detection unit configured to detect a rotation angle of the detection shaft. A rotation speed of the detection shaft is identical to a turning speed of the lower case.