Electronic Cam Return Control for Slave Axis Recovery
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Solution Overview
Problem
In electronic cam control systems, a slave axis can deviate from its intended position during a power disconnect, such as a power outage or device maintenance, requiring manual intervention to return to the corresponding master axis position upon power restoration.
Innovation Solution
A controller with a reference position calculator and return control unit that automatically recalculates and adjusts the positions of both axes based on the electronic cam profile, allowing the slave axis to automatically return to its correct position after power restoration, and includes an information provider for user convenience through a graphical interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation is used to move the slave axis to the position corresponding to the master axis after power disconnect, then the slave axis can be returned to the correct position, but the operation process becomes complex and time-consuming
Solution Approach 1:
The controller stores the position of the master axis and the electronic cam profile in memory before power disconnect occurs. When power is restored, the controller retrieves these stored values and automatically calculates the corresponding position of the slave axis, eliminating the need for manual intervention and reducing recovery time.
Solution Approach 2:
The controller performs automatic return control by itself after power restoration. The control unit calculates the reference positions of both axes using the stored master axis position and electronic cam profile, then automatically moves the slave axis to the calculated corresponding position without requiring manual operation.
2Productivity
If the slave axis position is not adjusted after power disconnect, then the system can resume operation quickly, but the slave axis remains at a deviated position causing operational errors
Solution Approach 1:
The controller stores the position of the master axis and the electronic cam profile in memory before power disconnect occurs. When power is restored, the controller retrieves these stored values and automatically calculates the corresponding position of the slave axis, eliminating the need for manual intervention and reducing recovery time.
Solution Approach 2:
The controller uses the stored electronic cam profile as a reference to calculate the correct corresponding position of the slave axis based on the master axis position. This feedback mechanism ensures that the slave axis is accurately positioned according to the predefined cam profile, maintaining both productivity and reliability.
3Extent of automation
If automatic return control is implemented, then the slave axis can automatically return to the correct position, but the control system becomes more complex
Solution Approach 1:
The controller integrates multiple functions into a single device: it stores position data and cam profiles in memory, calculates reference positions for both master and slave axes, executes return control by moving the slave axis, and displays status information. This multi-functionality reduces the need for separate components while achieving automatic return control.
Solution Approach 2:
The controller uses stored data (master axis position and electronic cam profile) as an intermediary to calculate the corresponding slave axis position. This intermediary approach simplifies the control logic by using pre-stored reference information rather than requiring complex real-time calculations or additional sensors.
4Loss of time
If reference positions are not recalculated after power disconnect, then the system can resume immediately, but the slave axis cannot operate correctly relative to the master axis
Solution Approach 1:
The controller stores the position of the master axis and the electronic cam profile in memory before power disconnect occurs. When power is restored, the controller retrieves these stored values and automatically calculates the corresponding position of the slave axis, eliminating the need for manual intervention and reducing recovery time.
Solution Approach 2:
The controller uses the stored electronic cam profile as a reference to calculate the correct corresponding position of the slave axis based on the master axis position. This feedback mechanism ensures that the slave axis is accurately positioned according to the predefined cam profile, maintaining both productivity and reliability.
Data Source
AI summary
A controller for performing synchronization control over the master axis and the slave axis to follow an electronic cam profile includes a reference position calculator that, in response to power being restored after a power disconnect, obtains a position of the master axis and calculates reference positions of the master axis and the slave axis based on the obtained position of the master axis, a position of the master axis at cam synchronization, and the electronic cam profile, and a return control unit that performs return control to determine a position of the slave axis corresponding to a current position of the master axis based on the current position of the master axis, the electronic cam profile, and the reference positions of the master axis and the slave axis calculated by the reference position calculator, and that moves the slave axis to the determined position.