Motor Drive Control Apparatus for Fan Impeller Protection
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Solution Overview
Problem
Existing motor drive control systems fail to effectively prevent damage to non-heat-generating components, such as fan impeller blades, when operating in high-temperature environments, as they do not adequately limit motor rotation speed to avoid deformation and damage.
Innovation Solution
A motor drive control apparatus with a temperature sensor to measure the temperature of non-heat-generating components, a rotation speed setting mechanism to set an upper limit based on detected temperatures, and a control system to ensure the motor's rotation speed does not exceed this limit, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor rotation speed is not limited in high-temperature environments, then the cooling function and productivity are maintained, but the non-heat-generating component (impeller blade) may deform or be damaged
Solution Approach 1:
The patent changes the operating parameter (rotation speed) based on temperature conditions. When the temperature exceeds the operation guarantee temperature, the control apparatus limits the rotation speed to a value lower than the rated rotation speed, preventing the impeller blade from deforming or being damaged while still maintaining some cooling function.
Solution Approach 2:
The patent implements dynamic adjustment of rotation speed limits based on real-time temperature detection. The control apparatus continuously monitors temperature and adjusts the rotation speed limit accordingly, allowing full speed operation within safe temperature ranges and imposing limits when temperatures become dangerous, thus dynamically balancing productivity and reliability.
2Power
If the duty ratio is not limited at high temperatures, then the motor performance is maintained, but the non-heat-generating component is at risk of damage
Solution Approach 1:
The patent changes the duty ratio parameter based on temperature conditions. When temperature exceeds the operation guarantee temperature, the control apparatus limits the duty ratio to prevent excessive power delivery that would cause the impeller blade to deform or be damaged, while still allowing motor operation.
Solution Approach 2:
The control apparatus uses temperature detection feedback to adjust the duty ratio limit. By continuously monitoring temperature and comparing it with the operation guarantee temperature, the system automatically adjusts the maximum allowable duty ratio to prevent thermal damage to the impeller while maintaining motor functionality.
3Reliability
If thermal shutdown protection is implemented at low temperatures, then component protection is achieved, but motor operation is frequently interrupted
Solution Approach 1:
The patent changes the threshold parameter for protection from a fixed low temperature value to a dynamic threshold based on operation guarantee temperature. By setting the protection threshold at the operation guarantee temperature (which is higher than traditional thermal shutdown temperatures), the system provides adequate protection while avoiding unnecessary interruptions during normal high-temperature operation.
Solution Approach 2:
The control apparatus performs preliminary speed limitation when temperature exceeds the operation guarantee temperature, preventing the temperature from reaching dangerous levels that would trigger thermal shutdown. This proactive approach maintains motor operation continuity while still protecting components by avoiding the need for abrupt shutdowns.
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
The solution effectively reduces the likelihood of abnormal states in non-heat-generating components by limiting motor rotation speed, ensuring continuous operation and maintaining cooling functionality even in high-temperature conditions.
Implementation Method 1
a temperature sensor that measures a temperature correlated with a temperature of the non-heat-generating component
Data Source
AI summary
A motor drive control apparatus is mounted on a fan having a motor and an impeller coupled to the motor. The motor drive control apparatus includes a temperature sensor for measuring a temperature correlated with a temperature of the impeller, a temperature comparing portion for comparing a detected temperature based on a measurement result of the temperature sensor with a first temperature higher than a highest value of a design temperature of the fan, a rotation speed setting portion for setting an upper limit value of the rotation speed of the motor based on a comparison result the temperature comparing portion, a PWM command portion for controlling such that the rotation speed of the motor does not exceed the upper limit value set by the rotation speed setting portion.