Device Protection Apparatus Using Refrigerant-Device Temperature Difference
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Solution Overview
Problem
The existing methods for torque limitation in motors fail to effectively suppress temperature rises at heat-generation parts, especially when the surrounding temperature is high, leading to potential overheating issues.
Innovation Solution
A device protection apparatus and method that detect temperature differences between a refrigerant and a device, applying drive limitations when these differences exceed predetermined thresholds, and further limiting the device's operation when its temperature exceeds specific thresholds to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If torque limitation is applied based on inverter temperature detection and smoothing processing, then the control system can manage thermal conditions, but temperature of heat-generation parts becomes too high when surrounding temperature is very high because torque limitation is not applied at appropriate timing
Solution Approach 1:
The system calculates temperature difference between the heat-generation part and refrigerant in advance, and applies torque limitation when this difference exceeds a threshold, before the heat-generation part temperature becomes critically high. This preliminary detection and action prevents excessive temperature rise by intervening early in the thermal escalation process.
Solution Approach 2:
The system continuously monitors both the heat-generation part temperature and refrigerant temperature, calculates their difference in real-time, and uses this feedback to dynamically adjust torque limitation. This closed-loop feedback mechanism ensures torque limitation is applied at the appropriate timing based on actual thermal conditions, resolving the issue of delayed response in high ambient temperature scenarios.
2Temperature
If drive limitation is applied when temperature difference exceeds threshold, then temperature rise at heat-generation part is suppressed, but device operation is restricted
Solution Approach 1:
The system dynamically adjusts drive limitation based on real-time temperature difference measurements. When the temperature difference between heat-generation part and refrigerant is within acceptable thresholds, full device operation is permitted. When the difference exceeds thresholds, torque limitation is applied proportionally. This dynamic adjustment optimizes the balance between temperature control and operational capacity, avoiding unnecessary restrictions when thermal conditions are acceptable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses temperature rises at heat-generation parts, extending the operational life of the device by reducing heat loads and preventing overheating, even in high environmental temperatures.
Implementation Method 1
detecting each of a temperature of a refrigerant used for cooling a device (3) and a temperature of the device
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A device protection apparatus comprising a first sensor for detecting temperature of a refrigerant used for cooling a device including a heat-generation part, a second sensor for detecting temperature of the device, and a controller 10 that applies drive limitation to the device based on a first detected temperature detected by the first sensor and a second detected temperature detected by the second sensor, wherein the controller 10 calculates a temperature difference between the first detected temperature and second detected temperature, applies drive limitation to the device when the temperature difference is higher than a predetermined temperature difference threshold value, and applies drive limitation to the device when the second detected temperature is higher than a predetermined first temperature threshold value.