Motor Controller Safety Function Units for Versatile Operation Monitoring
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Solution Overview
Problem
Existing motor control systems lack versatility in safety functions due to fixed operation monitor patterns, which are inadequate for varying configurations and environments of industrial machines.
Innovation Solution
A motor control system with multiple safety function units that can function simultaneously, allowing for selection of operation monitor patterns and input sources, enabling monitoring of driving state quantities and generating safety request signals based on selected patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed operation monitor patterns are used in motor control systems, then the system structure is simple, but the versatility and adaptability to different industrial machine configurations is poor
Solution Approach 1:
The safety control unit is divided into multiple independent safety function units (first safety function unit, second safety function unit, etc.), each capable of independently monitoring different operation monitor patterns. This segmentation allows the system to handle multiple safety monitoring tasks simultaneously while maintaining modular architecture that improves versatility without proportionally increasing overall system complexity.
Solution Approach 2:
Each safety function unit is designed with multi-functionality to select from multiple operation monitor patterns (first pattern, second pattern, third pattern, etc.) based on different industrial machine configurations and safety requirements. This universal design enables the same hardware structure to adapt to various safety monitoring needs, improving versatility without requiring separate dedicated units for each pattern.
2Adaptability or versatility
If multiple safety function units are added to improve versatility, then the adaptability increases, but the device complexity increases
Solution Approach 1:
Multiple safety function units are merged within a single safety control unit, sharing common resources such as the operation monitor pattern storage, selection logic, and output control mechanisms. This merging approach allows multiple safety monitoring functions to coexist while minimizing the increase in overall device complexity through resource sharing and integrated architecture.
Solution Approach 2:
The safety function units incorporate dynamic selection capabilities, allowing the system to activate only the necessary safety function units and operation monitor patterns based on specific industrial machine configurations and safety requirements. This dynamic activation reduces the effective complexity in operation while maintaining the versatility to handle multiple patterns when needed.
Data Source
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AI summary
A motor control system includes a motor and a motor controller. The motor controller is configured to control driving electric power for the motor based on a driving state quantity of the motor. The motor controller includes a plurality of safety function units configured to function simultaneously with each other. Each of the plurality of safety function units is configured to, upon input of a safety request signal from outside the motor controller, monitor a relationship between the driving state quantity and an operation monitor pattern selected from a plurality of kinds of operation monitor patterns.