Servo Motor Safety Control via Multi-Parameter Logic
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Solution Overview
Problem
Existing power source control systems unnecessarily stop operations even when operator safety can be ensured without doing so, leading to wasteful limitations.
Innovation Solution
An apparatus that detects multiple physical parameters of power sources and sets safety and limiting ranges, limiting operation only when all parameters meet specific conditions, allowing for conditional cancellation of operation limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a safety sensor is simply disregarded to avoid unnecessary stops, then operational flexibility is improved, but operator safety may be compromised when multiple parameters indicate danger
Solution Approach 1:
The system changes from monitoring a single safety parameter to monitoring multiple physical parameters (position, speed, acceleration, etc.) simultaneously. By evaluating combinations of parameter states rather than relying on a single sensor, the system achieves more nuanced safety assessment that prevents unnecessary stops while maintaining operator protection.
Solution Approach 2:
The system applies partial action by selectively limiting operation only when specific combinations of parameters indicate actual danger, rather than applying blanket safety restrictions. This allows operation to continue in situations where safety can be ensured through monitoring multiple parameters, while still stopping when necessary combinations of parameters indicate risk.
2Reliability
If multiple safety sensors are monitored to ensure operator safety, then reliability is improved, but unnecessary operation stops increase due to overly conservative safety logic
Solution Approach 1:
The safety monitoring system transitions from static, binary safety logic to dynamic evaluation that continuously assesses combinations of multiple physical parameters. The system adapts its safety determination based on the specific state combinations detected, allowing operation to continue when parameter combinations indicate safety even if individual parameters exceed traditional thresholds.
Solution Approach 2:
The system changes the safety determination criteria from single-parameter thresholds to multi-parameter state combinations. By evaluating whether detected parameter combinations fall within predefined safe ranges rather than checking individual parameter limits, the system reduces false safety violations while maintaining comprehensive operator protection.
3Ease of operation
If a single safety threshold is used for each sensor, then ease of operation is improved, but the system cannot distinguish between different operational states that may or may not require stopping
Solution Approach 1:
The safety monitoring function is segmented across multiple physical parameters rather than relying on a single sensor threshold. Each parameter contributes to the overall safety assessment, allowing the system to distinguish between different operational states by evaluating the collective state of multiple parameters rather than making binary decisions based on single thresholds.
Data Source
AI summary
A safety unit is provided for this purpose, and includes a position determining unit, a speed determining unit, a logical product unit, and a stopping unit. When a rotation amount (positional data) of an encoder rotating in connection with a rotation shaft of a servo motor falls within a predetermined limiting range, the position determining unit outputs a command for stopping a motor to a logical product unit. When rotation speed of the encoder rotating in connection with the rotation shaft of the servo motor falls within a predetermined limiting range, the speed determining unit outputs the command for stopping the motor to the logical product unit. This control by the logical product unit requires a stop command from both the position and speed determining units. The logical product unit informs the stopping unit to stop the servo motor to a controller.