Fan device, air flow adjustment device and air volume control method thereof
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Solution Overview
Problem
Ventilation systems face challenges in maintaining constant air flow volume due to variations in static pressure, such as dust accumulation and oil stains on filter screens, which can lead to decreased air quality and health risks.
Innovation Solution
A method and system for controlling air volume in motor-driven fan devices that utilize a lookup table to adjust driving voltage and rotating speed, ensuring constant air flow by using a target driving voltage and speed, and iteratively adjusting with a gain value to maintain preset air volume despite changes in static pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor speed is adjusted to maintain constant air volume when static pressure increases, then the air volume remains constant, but the energy consumption increases
Solution Approach 1:
The patent changes the motor operating parameters (voltage and speed) based on detected static pressure conditions. When static pressure increases due to filter clogging, the system adjusts the motor voltage and speed to maintain constant air volume, resolving the contradiction between maintaining reliable air flow and managing energy consumption through dynamic parameter adaptation
Solution Approach 2:
The patent implements a feedback control mechanism where the static pressure sensor continuously monitors system pressure, and the control unit adjusts motor parameters based on this feedback. This closed-loop system maintains constant air volume while optimizing energy consumption by only increasing power when actually needed to overcome pressure variations
2Reliability
If the motor power is increased to overcome high static pressure, then the air volume is maintained, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical pressure regulation mechanisms with an electronic control system. Instead of using mechanical variable geometry or throttling devices, the system uses electronic voltage and speed control of the motor, simplifying the overall device architecture while maintaining the ability to overcome high static pressure
Solution Approach 2:
The control unit serves multiple functions: it processes sensor data, calculates required motor adjustments, controls motor voltage, and monitors system performance. This multi-functional approach reduces the need for separate dedicated components for each control function, thereby reducing overall device complexity
Data Source
AI summary
A motor-driven fan device includes a motor, a processor, a storage with a lookup table stored therein, and a speed detection unit. The processor queries the lookup table or calculates to acquire the target driving voltage and a corresponding target rotating speed of the motor. When the rotating speed difference is not within the range of the preset rotating speed difference, the processor repeatedly adds a gain value to the target driving voltage to acquire a new target driving voltage, acquires the actual rotating speed and the target rotating speed, and determines whether the rotating speed difference is within the range of the preset rotating speed difference. The processor maintains the operation of the motor at the target rotating speed at that point by using the constant speed control method when the absolute value of rotating speed difference is within the range of the preset rotating speed difference.