Indoor Fan Motor Control for Stable Air Conditioner Airflow
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Solution Overview
Problem
Air conditioners face challenges in maintaining a uniform discharge air flow rate due to changes in static pressure caused by impurities like dust and varying installation conditions, which affect the fan's performance and efficiency.
Innovation Solution
The air conditioner includes a controller that adjusts the indoor fan motor's driving conditions by resetting the reference value of the rated air flow rate based on the fan motor's voltage and RPM, allowing it to operate in a non-feedback control state and adjust to different wind modes to maintain optimal air flow rates, even in the presence of environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air conditioner operates with fixed reference values for rated air flow rate, then the device complexity is reduced, but the discharge air flow rate cannot be maintained uniformly when static pressure changes due to dust accumulation or installation conditions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reference value of the rated air flow rate based on detected static pressure conditions. When static pressure changes due to dust accumulation or installation variations, the system modifies the fan motor's target RPM and corresponding air flow rate parameters to maintain optimal discharge performance, resolving the contradiction between reliability and fixed parameters
Solution Approach 2:
The patent implements feedback control by continuously monitoring static pressure conditions and using this information to adjust the fan motor operating parameters. The controller receives feedback about actual air flow conditions and compares it with target values, then automatically adjusts the reference air flow rate to maintain consistent discharge performance despite changing environmental conditions
2Reliability
If the reference value of rated air flow rate is adjusted dynamically, then the discharge air flow rate is maintained uniformly, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies self-service by enabling the air conditioner to automatically detect static pressure changes and adjust its own operating parameters without external intervention. The system monitors its own performance through built-in sensors and autonomously modifies the fan motor control parameters, reducing the need for complex external control mechanisms while maintaining reliable discharge air flow rate
3Productivity
If the fan motor operates at fixed RPM, then the control system is simple, but the air flow rate changes when static pressure changes due to dust or installation conditions
Solution Approach 1:
The patent applies dynamics by transitioning the fan motor control from a fixed RPM regime to a dynamic control system that adjusts motor speed based on detected static pressure conditions. The system continuously adapts the motor operating point to maintain optimal air flow rate despite changing environmental conditions, resolving the contradiction between productivity and control complexity through intelligent dynamic adjustment
Data Source
AI summary
An air conditioner includes an indoor fan motor driven according to a signal to control the indoor fan motor by a controller, and a controller that resets a reference value of a rated air flow rate according to the pre-set conditions by checking an indoor fan motor driving voltage when an indoor fan motor RPM reaches a reference value of a strong wind mode while the air conditioner operates in strong wind mode. The controller compares the checked indoor fan motor driving voltage with a reference indoor fan motor driving voltage of the rated air flow rate, and resets the reference value when the checked indoor fan motor driving voltage is different from the reference indoor fan motor driving voltage of the rated air flow rate.