Decentralized Multi-Axis Servo Control for Synchronized Motor Precision
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Solution Overview
Problem
Existing multi-axis servo control systems face limitations in synchronization due to communication cycle constraints and have poor expandability and replaceability due to current output limitations, especially in multi-axis applications.
Innovation Solution
A multi-axis servo control system with decentralized control, where each drive unit is connected to a control unit through high-speed local buses forming a series-connected communication loop, allowing for distributed processing of current and position commands, enabling precise control of motors and improving expandability and replaceability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single servo driver controls multiple motors, then the system complexity is reduced, but the expandability and replaceability are limited due to output current limitations
Solution Approach 1:
The patent divides the control system into multiple independent drive control apparatuses, each capable of controlling one or more motors. This segmentation allows the system to scale by adding more drive control apparatuses without being limited by the output current of a single driver, thereby improving expandability and replaceability while maintaining manageable system complexity.
2Manufacturing precision
If each motor is controlled by a separate servo driver, then the control precision is improved, but the synchronization is limited by the communication cycle of the field bus
Solution Approach 1:
The patent combines multiple drive control apparatuses into a distributed control network where each apparatus can independently control motors with high precision while maintaining synchronization through coordinated communication. This merging approach allows each drive control apparatus to operate autonomously for precise control while collaborating for synchronized multi-axis operation, resolving the contradiction between control precision and synchronization.
3Device complexity
If a single servo driver controls multiple motors, then the device complexity is reduced, but the calculation load on the control unit increases
Solution Approach 1:
The patent segments the control functions by introducing multiple drive control apparatuses, each with its own control unit. This distribution of control units divides the calculation load across multiple independent processors, preventing any single control unit from becoming overloaded while maintaining manageable device complexity through modular architecture.
Data Source
AI summary
A multi-axis servo control system includes a plurality of motors and a plurality of drive control apparatuses. The drive control apparatuses are connected to each other through an external field bus. Each drive control apparatus includes a control unit and a plurality of drive units. The drive units are connected to the control unit in series by a plurality of local buses to form a series-connected communication loop of sequentially transmitting data. Each drive unit controls at least one of the motors. The control unit receives multi-axis position commands through the external field bus, and the drive units correspondingly receive multi-axis commands through the local buses so as to control the motors in a decentralization manner.