Self-synchronous AC servo system serial communication
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Solution Overview
Problem
Current multiple axes control architectures with centralized control face high costs, limited axis numbers, complex wiring, insufficient resolution, environmental interference, and maintenance challenges due to the need for high-speed communication and synchronization protocols, which are prone to noise and require expensive hardware.
Innovation Solution
A self-synchronous AC servo system for high-speed serial communication that eliminates the need for synchronization protocols by using a transmission line with a computer, master axis drive, and slave axis drives, where commands are sent through the line, and drives store commands in queues to operate synchronously based on a timing clock, allowing each axis to determine if the command is for itself and drive accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If high-speed communication network is used to replace conventional wiring, then wiring complexity is reduced and interference is prevented, but synchronization difficulty increases and optical fiber hardware is required
Solution Approach 1:
Each drive unit autonomously determines whether a received command is intended for itself by checking the command address against its own address, eliminating the need for centralized arbitration or complex synchronization protocols. This self-service mechanism simplifies the communication network while maintaining reliable synchronization across multiple axes.
2Reliability
If synchronization protocol is implemented for high-speed serial communication, then communication reliability is improved, but system complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the synchronization protocol layer from the communication system. By having each drive unit independently process commands based on address matching and local timing clocks, the complex synchronization protocol is removed entirely, reducing system complexity while maintaining reliability through decentralized command execution.
Solution Approach 2:
The patent replaces the mechanical/metaphorical synchronization protocol mechanism with a simpler address-matching and local-timing mechanism. Instead of using complex synchronization handshaking, each drive unit uses its own timing clock and address comparison to determine when and how to execute commands, substituting a simpler control mechanism for the complex protocol.
3Productivity
If command address matching is used to route commands to specific drives, then communication efficiency is improved, but command processing time increases due to queue storage
Solution Approach 1:
Command addresses are pre-configured in each drive unit, allowing for rapid matching and identification of the intended recipient without requiring complex real-time routing decisions. This preliminary configuration enables efficient command distribution while minimizing processing time through simple address comparison.
Data Source
AI summary
A self-synchronous AC servo system is used for high-speed serial communication and has multiple axes control. The system includes a computer (34) sending command to master axis drive (36) and slave axis drive (42) through a transmission line (32). The master axis drive (36) and slave axis drive (42) send interrupt request to the computer (34) through the transmission line (32) after receiving the command. Each drive will judge whether the command is for it self according to the interrupt request and stores a plurality of computer commands in queue. Each drive drives master axis motor (38) or slave axis motor (40) by the queued command synchronously according to a synchronous timing clock.