Fan Motor Current Feedback for Constant Air Volume Control
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Solution Overview
Problem
Conventional air conditioners struggle to maintain constant air volume control due to variations in supply voltage, which can affect the static pressure and fan motor RPM, leading to inconsistent air volume delivery.
Innovation Solution
An air conditioner system that includes a power supply, a driving mechanism to adjust motor driving voltage based on a duty value, a current detector, a storage for static pressure and air volume data, and a motor controller that calculates and adjusts the fan motor RPM to maintain constant air volume regardless of supply voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan motor RPM is controlled based on static pressure measurement, then air volume can be adjusted, but constant air volume cannot be maintained when supply voltage varies
Solution Approach 1:
The system uses current detection as feedback to dynamically adjust fan motor RPM. The controller detects the current value input to the fan motor and uses this feedback signal to calculate and adjust the RPM, ensuring constant air volume delivery even when supply voltage fluctuates. This closed-loop feedback mechanism resolves the contradiction by making air volume delivery reliable despite voltage variations.
Solution Approach 2:
The system changes the control parameter from static pressure-based RPM control to current-based RPM control. By detecting current values and using them to calculate target RPM, the system adapts to supply voltage variations and maintains consistent air volume. This parameter change enables the system to achieve both air volume adjustment and constant air volume delivery under varying conditions.
2Ease of operation
If the fan motor RPM is varied according to static pressure, then air volume can be controlled, but the control is affected by supply voltage changes
Solution Approach 1:
The system changes the control parameter from static pressure to current detection. The controller detects current values input to the fan motor and uses this parameter to calculate target RPM, making the control system adaptable to different supply voltages while maintaining ease of air volume control.
Solution Approach 2:
The system applies local quality by using current detection specifically at the fan motor input to obtain voltage-adaptive control information. This localized measurement provides the adaptability needed to handle voltage variations while maintaining simple air volume control operation.
3Device complexity
If conventional current information based on constant supply voltage is used, then control is simple, but setting air volume cannot be provided when supply voltage changes
Solution Approach 1:
The system uses current value as the control parameter instead of relying on assumptions of constant supply voltage. This simple parameter change enables the control system to adapt to voltage variations without increasing complexity, as the current detection and基于current的RPM calculation maintain operational simplicity while providing voltage adaptability.
Data Source
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AI summary
The present disclosure is to provide an air conditioner, capable of performing constant air volume control regardless of the variation in a supply voltage and a method for operating the same.