Rotary Drive Unit Rotation Control for Cable Stress Limits
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Solution Overview
Problem
The relative rotation between a rotary unit and a base unit in drive units, used in warehouse environments, can exceed a safe limit, causing cable stress and potential disconnection, leading to loss of power or controllability.
Innovation Solution
A control system monitors the relative rotation and adjusts the rotational direction of the base unit to maintain the rotation within a predefined maximum value, avoiding excessive stress on cables by instructing the base unit to turn in a direction that reduces the relative rotation, such as performing a 270-degree turn instead of a 90-degree turn when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rotary unit rotates freely relative to the base unit during navigation, then the drive unit can perform arbitrary turns and maneuvers, but the cables connecting the rotary unit to the base unit will experience excessive stress and may disconnect
Solution Approach 1:
The system dynamically adjusts the rotational relationship between the rotary unit and base unit by monitoring cable stress levels and controlling the rotary unit to rotate only when cable stress is within safe thresholds, enabling adaptive maneuverability while protecting against cable damage
Solution Approach 2:
The system continuously monitors the stress state of cables connecting the rotary unit to the base unit and uses this feedback information to control rotation operations, preventing cable disconnection while maintaining operational flexibility
2Reliability
If the rotary unit is constrained to prevent excessive rotation, then cable stress is reduced and connection reliability improves, but the drive unit loses maneuverability and cannot perform necessary turns
Solution Approach 1:
The system dynamically adjusts the rotational relationship between the rotary unit and base unit by monitoring cable stress levels and controlling the rotary unit to rotate only when cable stress is within safe thresholds, enabling adaptive maneuverability while protecting against cable damage
Solution Approach 2:
The system takes preliminary protective action by monitoring cable stress before rotation occurs and preventing rotation that would exceed cable stress thresholds, thereby avoiding cable damage before it happens while still allowing necessary maneuvers
3Reliability
If cables are made more robust to handle higher rotation stresses, then cable connection reliability improves, but the device complexity and space requirements increase
Solution Approach 1:
The system changes the operational parameters by monitoring and controlling the stress state of cables in real-time, adjusting rotation operations based on cable stress thresholds rather than using inherently more robust cable designs, thereby maintaining reliability without increasing device complexity
Data Source
AI summary
Method and apparatus for identifying a relative rotation between a rotary unit and a base unit in a drive unit, receiving a command that changes the relative rotation when the command is executed by the drive unit, determining that rotating at least one of the base unit or the rotary unit in a first direction in response to the command results in the relative rotation exceeding a maximum rotation value, and rotating at least one of the base unit or the rotary unit in a second direction opposite the first direction while executing the command. In one example, the drive unit may include cables that transfer power and control signals from the base unit to the rotary unit. Determining whether executing the command results in the relative rotation exceeding the maximum rotation value can ensure the cables are not damaged.