Redundant Roller Screw Servo Mechanism for Jam Self-Recovery
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Solution Overview
Problem
Existing electromechanical servo mechanisms (EMAs) face reliability issues due to mechanical failures in ball and roller screws, such as jamming and stuck phenomena, which are difficult to eliminate and hinder performance improvement.
Innovation Solution
An ultra-short mechanical fault self-recovery electromechanical servo mechanism with redundant designs, incorporating a servo motor assembly, primary and secondary work roller screw pairs, and electromagnetic clutches for fault recovery, allowing the system to switch to a fault mode where the secondary screw pair takes over upon primary failure, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball screw or roller screw is used as the transmission component, then the electromechanical servo mechanism can achieve motion conversion, but mechanical failures such as jamming, stuck phenomenon, and thread meshing problems occur, reducing reliability
Solution Approach 1:
The transmission system is divided into two independent roller screw pairs (primary and secondary) that can operate separately. Each roller screw pair can function independently, and when one fails, the other can take over, thus improving reliability through functional segmentation without requiring a completely complex redundant system
Solution Approach 2:
Both the primary and secondary roller screw pairs are designed with identical structures and functions, capable of performing the same motion conversion task. This universality allows either component to fulfill the transmission function, ensuring system reliability while maintaining a relatively simple and standardized design
2Reliability
If electromagnetic clutch assemblies are added for fault recovery, then the system can achieve self-recovery from mechanical failures, but the device complexity increases
Solution Approach 1:
The electromagnetic clutch assemblies enable the system to automatically detect failures and switch from the primary to the secondary roller screw pair without external intervention. The system performs self-diagnosis and self-recovery by activating the backup component when the primary component fails, improving reliability while minimizing the need for complex external control systems
Solution Approach 2:
The secondary roller screw pair and electromagnetic clutch assemblies are pre-configured and ready for immediate activation in case of primary component failure. This preliminary preparation ensures that fault recovery can occur rapidly without requiring complex real-time decision-making or external control, thus improving reliability while keeping the control system relatively simple
3Duration of action of moving object
If the secondary work roller screw pair assembly is activated for fault recovery, then continuous operation can be maintained, but the structural complexity increases
Solution Approach 1:
The transmission system is segmented into two independent roller screw pairs that can operate separately. This segmentation allows one component to be isolated for maintenance or replacement while the other continues to operate, enabling continuous system operation without requiring a completely complex redundant architecture
Solution Approach 2:
When the primary roller screw pair fails, the system switches to the secondary roller screw pair, effectively discarding the failed component and recovering functionality through the backup component. This approach maintains continuous operation while keeping the structural complexity manageable through systematic component replacement rather than complex real-time reconfiguration
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 mechanism achieves fault-tolerant and redundant operation, maintaining performance by isolating and recovering from mechanical failures, ensuring high reliability and miniaturization with a compact structure.
Implementation Method 1
a lead screw roll limiting electromagnetic clutch assembly, provided at an power output end of the primary work roller screw pair assembly; and a nut roll limiting electromagnetic clutch assembly, provided on the secondary work roller screw pair assembly
Data Source
AI summary
An ultra-short electromechanical servo mechanism for mechanical fault self-recovery. Two sets of lead screw transmission components having the same lead parameters and bearing capacity are redundantly and coaxially arranged, and are powered by a single servo motor set. A lead screw roll limiting electromagnetic clutch and a nut roll limiting electromagnetic clutch are used for realizing fault isolation when a primary lead screw pair is stuck or jammed. Meanwhile, a standby bearing lead screw pair is started to synchronously complete mechanical fault self-recovery.