Motor Drive Device Detecting Heat Sink Clogging via Temperature Change
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Solution Overview
Problem
Conventional motor drive devices face challenges in detecting clogging of heat sink flow paths, especially when temperature fluctuations occur rapidly, making it difficult to identify malfunctions such as airflow obstruction.
Innovation Solution
A motor drive device with a heat sink, fan, fan controller, temperature detection, and malfunction determination system that calculates temperature changes over time by reducing fan rotation and generates an alarm if the change deviates from predetermined standards, indicating potential airflow malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature measurement is used to detect clogging in heat sink, then malfunction detection capability is improved, but detection reliability deteriorates when temperature fluctuates rapidly in short time
Solution Approach 1:
The system performs preliminary cooling by operating the fan at a lower rotation number before the regular operation. This preliminary action creates a controlled temperature change state that is used for malfunction detection, separating the detection phase from the normal operation phase to avoid interference from rapid temperature fluctuations during motor drive operations
Solution Approach 2:
The system dynamically adjusts fan rotation numbers between lower rotation number for detection and regular rotation number for operation. By controlling the fan speed to transition between these states, the system creates optimal conditions for temperature-based malfunction detection while maintaining normal operational performance
2Measurement precision
If fan rotation number is reduced for temperature-based malfunction detection, then detection accuracy is improved, but cooling performance deteriorates
Solution Approach 1:
The system implements periodic detection cycles where the fan operates at lower rotation number for a predetermined period to enable temperature-based malfunction detection, then returns to regular rotation number for normal cooling. This periodic switching allows the system to maintain both detection capability and cooling performance by allocating specific time periods for each function
Solution Approach 2:
The lower rotation number operation serves as a preliminary detection phase before regular operation. During this preliminary phase, the fan runs at reduced speed to create measurable temperature changes for malfunction detection, after which the system transitions to full-speed operation for effective cooling
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 solution enables precise detection and notification of airflow malfunctions in heat sink flow paths, even during rapid temperature changes, ensuring timely maintenance and preventing overheating.
Implementation Method 1
a fan which causes the fluid to flow in the flow path
Implementation Method 2
a temperature detection part which detects the temperature of the motor drive device
Implementation Method 3
a heat sink including a flow path for a fluid
Implementation Method 4
a heat sink including a flow path for a fluid; a fan which causes the fluid to flow in the flow path
Data Source
AI summary
A motor drive device detects the malfunction of a flow path in a heat sink based on the temperature of the device. The motor drive device includes: a temperature detection part which detects the temperature of the motor drive device; a temperature change calculating part which calculates the degree of change of the temperature with respect to time when the rotation number of a fan is controlled to a lower rotation number than a regular rotation number; an malfunction determination part which determines whether or not the degree of the change is different from a predetermined standard; and an malfunction signal generation part which generates a signal indicating that malfunction occurs in fluid flow when it is determined that the degree of the change is different from the standard.