Motor Control Reception with Gradual Failsafe Transition
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Solution Overview
Problem
Existing failsafe processes in radio control systems cause sudden changes in motor driving instruction values, leading to unstable postures and potential motor damage in remotely controlled objects due to counter electromotive forces.
Innovation Solution
A reception device with a controller that performs a hold process for maintaining the current motor driving instruction value and a failsafe gradual change process to smoothly transition to a failsafe value when signal reception fails, preventing sudden changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a failsafe process is activated to output a predetermined failsafe value as the motor driving instruction value when control signal reception fails, then safety is improved by preventing continued operation in a high propulsive force state, but the motor driving instruction value changes suddenly causing the posture of the operated object to change suddenly and potentially damaging the motor
Solution Approach 1:
The system dynamically adjusts the motor driving instruction value based on the reception failure duration. During a hold period, the current value is maintained to preserve posture stability. After the hold period expires, the system transitions to gradually changing the value toward the failsafe value, enabling both safety and stability to be achieved at different stages of the failure response
Solution Approach 2:
The system implements a hold period as a cushioning mechanism before activating the failsafe process. This preliminary time window prevents immediate sudden changes, and the gradual change process further cushions the transition, protecting the motor and posture from abrupt variations while still ensuring safety ultimately
2Stability of the object's composition
If the motor driving instruction value is held at the current value during reception failure, then posture stability is maintained, but safety is compromised by allowing continued operation in a potentially dangerous high propulsive force state
Solution Approach 1:
The system uses dynamic time-based control where the motor driving instruction value is held during an initial hold period to maintain stability, then gradually changed after the hold period expires to ensure safety. This dynamic adjustment resolves the contradiction by applying different control strategies at different time stages
Solution Approach 2:
The system implements periodic evaluation of the reception failure duration against a predetermined hold period threshold. This periodic check determines whether to maintain the held value or transition to gradual change, enabling the system to balance stability and safety through time-based periodic decision-making
Data Source
AI summary
Provided is a reception device comprising: a reception part configured to receive the control signal from a transmission device; and a controller configured to performs a process of outputting a motor driving instruction value corresponding to the control signal received by the reception part as a motor driving instruction value for controlling a driving amount of a motor, wherein the controller performs: a hold process for holding and outputting a value corresponding to the control signal during a reception period as the motor driving instruction value when the control signal is not receivable; and a failsafe gradual change process for gradually changing the motor driving instruction value from the value during the hold process toward a failsafe value determined for failsafe when a period of the hold process reaches a certain period.