Master-Slave Motor Temperature Control for Machine Tools
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Solution Overview
Problem
Existing control methods for machine tools with master-slave synchronous drive systems are ineffective in preventing overheating of the slave shaft, as they do not allow independent temperature control of the slave-shaft motor, leading to potential overheating even when the master shaft is controlled to avoid overheating.
Innovation Solution
A control device and method that monitor and adjust the operation of both the master and slave shaft motors based on their respective temperatures, using temperature acquisition and estimation parts to create operation commands that restrict output or load to prevent overheating, synchronizing the slave shaft with the master shaft's operation to maintain temperature balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the master-shaft motor operation is controlled to prevent overheating, then the master shaft temperature is reduced, but the slave shaft may still overheat due to lack of independent temperature control
Solution Approach 1:
The patent divides the temperature control system into independent segments for the master shaft and slave shaft. Each shaft has its own temperature acquisition part and control logic, allowing independent temperature monitoring and operation adjustment. This segmentation enables the slave shaft to be controlled separately from the master shaft, preventing the slave shaft overheating issue that occurs when only master shaft temperature is controlled.
2Reliability
If temperature monitoring is added for both master and slave shafts, then overheating prevention capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the temperature control functions into a unified control device that manages both master and slave shafts. The control device integrates multiple temperature acquisition parts, operation command creation parts, and determination parts into a single coordinated system. This merging approach allows comprehensive temperature monitoring of both shafts while avoiding the complexity of completely separate control systems, as the overall control architecture remains centralized and coordinated.
3Temperature
If operation commands are created to restrict output based on temperature, then motor temperature is reduced, but machining productivity decreases
Solution Approach 1:
The patent implements dynamic operation adjustment based on real-time temperature conditions. The determination part continuously evaluates temperature data and dynamically modifies operation commands to restrict output only when and where needed. This dynamic approach allows the system to maintain high productivity during normal operation while automatically reducing output only when temperature thresholds are approached, rather than applying static restrictions that would continuously limit productivity.
Data Source
AI summary
To provide a control device and control method capable of preventing overheating of both a master shaft and slave shaft. A control device for machine tools includes a master-shaft motor drive part, a slave-shaft motor drive part and a numerical control part that sends a master-shaft operation command to the master-shaft motor drive part, in which the master-shaft motor drive part drives the master-shaft motor based on the master-shaft operation command received from the numerical control part, the slave-shaft motor drive part drives the slave-shaft motor so as to synchronize with the master-shaft motor based on position feedback information received from the master-shaft motor, and the numerical control part creates the master-shaft operation command to change operation so as to restrict output of the master-shaft motor, upon the temperature of the master-shaft motor exceeding a first predetermined value, or the temperature of the slave-shaft motor exceeding a second predetermined value.