Multi-Motor BLDC Fan System for Constant Air Volume Control
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Solution Overview
Problem
Existing multi-motor driving systems face challenges in maintaining constant air volume efficiently, particularly in applications requiring precise control of brushless DC (BLDC) motors to drive wind wheels in a shared air duct.
Innovation Solution
A method involving a data processor that stores a constant air volume control function Q=F(n, C), where Q is air volume, n is rotational speed, and C is an operating parameter, transmitting identical speed signals to BLDC motors, and calculating motor speed to maintain constant air volume by feedback from motor operating parameters, ensuring equal or approximately equal rotational speeds across multiple BLDC motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple BLDC motors are used to drive wind wheels in a shared air duct, then the air moving capability is improved, but the control complexity increases
Solution Approach 1:
The system divides the control function into two levels: a data processor that handles high-level coordination and air volume calculation, and individual motor control circuits that execute specific speed control commands. This segmentation allows multiple motors to operate independently while maintaining unified control, resolving the contradiction between enhanced air moving capability and increased control complexity.
Solution Approach 2:
The system implements feedback control by continuously monitoring motor operating parameters (such as current and speed) and using this information to calculate and adjust the required motor speed for maintaining constant air volume. The feedback loop enables the data processor to compensate for variations in motor performance and load conditions, simplifying the overall control by automating the coordination of multiple motors.
2Stability of the object's composition
If identical speed signals are transmitted to multiple BLDC motors, then the rotational speed uniformity is improved, but the adaptability to varying load conditions deteriorates
Solution Approach 1:
The system dynamically adjusts the speed control strategy based on operating conditions. While identical speed signals are transmitted to maintain uniform rotational speed, the data processor continuously calculates the required speed based on feedback from motor operating parameters and load conditions. This dynamic approach allows the system to adapt to varying loads while maintaining speed uniformity across motors.
Solution Approach 2:
The system changes the speed parameter dynamically by calculating the optimal motor speed n using the constant air volume control function Q=F(n, C) based on feedback from motor operating parameters. This allows the identical speed signal transmitted to multiple motors to adapt to varying load conditions, resolving the contradiction between speed uniformity and load adaptability.
3Measurement precision
If a data processor is used to calculate motor speed for constant air volume, then the air volume control precision is improved, but the computational requirements and system complexity increase
Solution Approach 1:
The data processor is designed to perform multiple functions: it transmits identical speed signals to multiple motors, receives feedback from motor operating parameters, calculates the required motor speed using the constant air volume control function, and maintains constant air volume. This multi-functionality consolidates control tasks into a single device, improving air volume control precision while minimizing the increase in system complexity.
Data Source
AI summary
A method for outputting constant air volume by a fan system including at least two brushless DC (BLDC) motors, the method including: storing a constant air volume control function Q=F (n, C) in a data processor, where Q indicates an air volume, n indicates a rotational speed of the BLDC motors, and C indicates an operating parameter of the BLDC motors; transmitting, by the data processor, identical speed signal commands to the BLDC motors, and allowing the BLDC motors to operate at equal or approximately equal rotational speeds; and feedbacking, by the BLDC motors, motor operating parameters C to the data processor, calculating, by the data processor, a motor speed n for outputting and maintaining a constant air volume, and transmitting the motor speed to the BLDC motors.