Motor Safety Controller for Controlled Error Shutdown
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Solution Overview
Problem
Existing motor control systems in industrial and automotive applications face challenges in safely managing sudden failures, leading to potential hazards due to abrupt shutdowns, which are often mitigated by costly and complex redundant designs that increase system complexity and weight.
Innovation Solution
A motor control apparatus and method that includes a sensor for determining a target state, a controller for generating motor control signals, a monitor for detecting errors, and a safety controller to generate an alternative motor control signal to safely put the motor into a controlled rest state upon error occurrence, thereby avoiding the need for redundant systems and reducing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant systems are implemented to prevent abrupt motor failure, then safety and reliability are improved, but system complexity and cost increase significantly
Solution Approach 1:
The safety controller is pre-configured with alternative control logic that automatically activates upon detecting an error signal. This preliminary preparation allows the system to switch to a safe operating mode without requiring complex real-time decision-making or multiple redundant control systems, thereby improving reliability while maintaining manageable system complexity
Solution Approach 2:
The safety controller acts as an intermediary component between the monitor and the motor control system. It receives error signals from the monitor and generates appropriate alternative control signals, serving as a bridge that simplifies the overall system architecture while ensuring safety without requiring full redundancy of the entire control system
2Reliability
If redundant systems are implemented to maintain motor operation during component failure, then system availability is improved, but weight and cost increase
Solution Approach 1:
The invention extracts only the essential safety function from the full redundant system requirement. Instead of duplicating the entire control system, only a dedicated safety controller with alternative control logic is implemented, which is sufficient to handle failure scenarios. This selective extraction maintains system availability while significantly reducing the weight compared to full redundancy
Solution Approach 2:
The safety controller is designed as a dedicated, relatively simple component that handles failure scenarios. Rather than investing in expensive, heavy redundant systems, this approach uses a more economical safety controller that activates only when needed, providing cost-effective and weight-efficient protection against motor failure
3Reliability
If abrupt motor shutdown occurs upon error, then system safety is improved, but harmful effects such as local heating and fire hazards increase
Solution Approach 1:
The safety controller implements preliminary anti-action by preparing alternative control strategies in advance that specifically counteract the harmful effects of abrupt shutdown. When an error occurs, these pre-planned alternative controls activate to gradually reduce motor operation or maintain critical functions, preventing the sudden stoppage that causes local heating and fire hazards while still ensuring system safety
Solution Approach 2:
The invention converts the potentially harmful abrupt shutdown into a beneficial controlled transition. The safety controller transforms the error condition into an opportunity to activate alternative control modes that maintain safety while avoiding the harmful thermal effects, effectively turning the error response into a protective mechanism rather than a hazard source
4Device complexity
If sudden steering assistance failure occurs, then system simplicity is maintained, but driver safety and adaptability are severely compromised
Solution Approach 1:
The safety controller is pre-configured with alternative control logic that automatically activates upon detecting an error signal in the steering assistance system. This preliminary preparation allows the system to switch to a safe operating mode without requiring complex real-time decision-making or multiple redundant control systems, thereby improving reliability while maintaining manageable system complexity
Solution Approach 2:
The safety controller acts as an intermediary component between the monitor and the motor control system. It receives error signals from the monitor and generates appropriate alternative control signals, serving as a bridge that simplifies the overall system architecture while ensuring safety without requiring full redundancy of the entire control system
Data Source
AI summary
A motor is controlled by a motor control signal so that it reaches a target state, which is derived from sensor data sensed by a sensor. The motor can be put into a rest state at the occurrence of an error in simple and efficient manner by means of a safety means generating an alternative motor control signal at the occurrence of the error. Thus, the underlying idea is, instead of redundantly embodying components, to consciously accept a failure and integrate a corresponding fall-back solution into the overall concept. The failure is detected, and the motor is switched off in a user-manageable manner by a targeted shutdown.