Drive Mechanism Stop Control for Communication Failure Deceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control methods for drive mechanisms in machine tools with multiple axes struggle to safely stop a mobile body within its limited range when communication failures occur between the master and slave controllers, potentially leading to collisions due to inadequate deceleration settings, which can result in vibration and increased load on the drive mechanism.
Innovation Solution
A control method that includes abnormality detection, remaining distance calculation, limit deceleration calculation, and limit stop control to ensure the mobile body stops at a deceleration that allows it to safely reach its movement limit position without collision, while also considering a normal stop control for cases where the stop distance is within the remaining distance, thereby minimizing vibration and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If electrical current limit stop is used to stop the mobile body at the shortest distance, then the stopping distance is minimized, but vibration is generated and the load on the drive mechanism increases
Solution Approach 1:
The patent applies dynamics by making the deceleration value adjustable based on the detected position of the mobile body. The deceleration is not fixed but dynamically adapted: when the mobile body is far from the limit position, a smaller deceleration is applied to reduce vibration and load; when closer, the deceleration is increased to ensure stopping before the limit position is reached.
Solution Approach 2:
The patent changes the parameter of deceleration based on the position of the mobile body. By calculating the distance to the limit position and adjusting the deceleration value accordingly, the system optimizes the stopping process to balance between stopping distance and minimizing harmful vibrations and loads on the drive mechanism.
2Object-generated harmful factors
If decelerated stop with fixed deceleration is used, then vibration and load are reduced, but the mobile body may not stop in time to prevent collision
Solution Approach 1:
The system dynamically adjusts the deceleration value based on the mobile body's position relative to the limit position. This dynamic adjustment ensures that the deceleration is sufficient to prevent collision while minimizing vibration and load, resolving the contradiction between gentle stopping and reliable collision prevention.
Solution Approach 2:
The system uses feedback from the detected position of the mobile body to adjust the deceleration command. By continuously monitoring position and calculating the distance to the limit position, the system provides feedback control that ensures reliable collision prevention while optimizing the stopping profile to reduce vibration and load.
3Reliability
If the deceleration setting is made large to prevent collision, then collision prevention is improved, but vibration generation increases
Solution Approach 1:
The patent changes the deceleration parameter based on the position of the mobile body. By calculating the distance to the limit position and adjusting the deceleration value accordingly, the system achieves reliable collision prevention while minimizing vibration by using the minimum necessary deceleration at each position.
Data Source
AI summary
A control method according to the present invention is a control method for a drive mechanism in a drive system which causes a mobile body to move by way of the drive mechanism in accordance with an instruction from a master controller, the method including: an abnormality detection step of detecting an abnormal state in which control by the master controller is not possible; a remaining distance calculation step of calculating a remaining distance until a movement limit position in a current movement direction of the mobile body, when having detected an abnormal state in the abnormality detection step; a limit deceleration calculation step of calculating a limit deceleration in which the mobile body can stop in the remaining distance which was calculated in the remaining distance calculation step; and a limit stop control step of controlling the drive mechanism so as to cause the mobile body to stop at a deceleration of at least the limit deceleration.