Paralleled Motor Drive Position Control Without Intercommunication Buses
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Solution Overview
Problem
Mechanically paralleled electrical drives in position control systems face challenges in achieving balanced torque production without introducing additional single points of failure, as existing methods like intercommunication buses complicate the system architecture and reduce fault tolerance.
Innovation Solution
A control loop system where each motor drive calculates its current demand based on position errors and feedback signals, incorporating a 'discharge term' that adjusts dynamically with the current demand, allowing for balanced torque production without explicit communication between drives, using functions such as linear, quadratic, or cubic feedback to optimize load sharing across various torque levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If intercommunication buses are used between paralleled motor drives, then balanced torque production is achieved, but fault tolerance is reduced and system complexity increases
Solution Approach 1:
The patent uses the mechanical load itself as an intermediary to achieve torque balancing. By coupling the paralleled motor drives through a common mechanical load with sufficient inertia, the system naturally balances torque distribution without requiring communication buses. The mechanical load acts as a mediator that equalizes the torque demands on each motor drive.
Solution Approach 2:
The system achieves self-balancing of torque through the inherent dynamics of the paralleled motor drives connected to a common mechanical load. Each motor drive automatically adjusts its torque contribution based on the mechanical feedback from the shared load, eliminating the need for external communication infrastructure.
2Manufacturing precision
If intercommunication buses are used between paralleled motor drives, then torque balancing is achieved, but system architecture is complicated
Solution Approach 1:
The patent extracts and removes the communication bus infrastructure from the system entirely. By eliminating this component, the system achieves torque balancing through purely mechanical means, significantly simplifying the overall architecture while maintaining the desired performance.
Solution Approach 2:
The patent replaces the electronic communication system (software/digital domain) with a mechanical coupling system. The torque balancing function previously achieved through digital communication is now accomplished through mechanical interaction via the common load, substituting complex electronic infrastructure with simple mechanical connectivity.
3Reliability
If multiple communication buses are used for fault tolerance, then reliability is improved, but system complexity increases
Solution Approach 1:
The system provides inherent fault tolerance through its decentralized architecture where each motor drive operates independently. The mechanical coupling naturally allows for graceful degradation if one drive fails, without requiring redundant communication paths. The system self-adapts to partial failures through the mechanical load's inertia and the remaining functional drives.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~5
AI summary
There is provided a system (100) comprising; a mechanical load (160); a first electrical motor (131) and associated motor drive (121) and a second electrical motor (132) and associated motor drive (122), the first electrical motor (131) and the second electrical motor (132) being configured to drive the mechanical load (160) in parallel. Each electrical motor (131, 132) and associated motor drive (121, 122) have a respective position sensor (171, 172) configured to measure the output position of the mechanical load (160); and each motor drive (121, 122) comprises a respective controller configured to output a current demand for its associated motor (131, 132) based on a position error between a desired output position of the mechanical load (160) and the measured output position of the mechanical load from its respective position sensor (171, 172), and a feedback signal of its output current demand.