Fan Speed Control Module Autonomous Parallel Adjustment
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Solution Overview
Problem
Conventional speed control modules for plural fan systems are unable to automatically adjust fan speeds when one fan becomes abnormal, leading to reduced efficiency and requiring costly control center circuits that need replacement when the number of fans changes.
Innovation Solution
A fan device with an improved speed control module featuring a control unit and speed adjusting circuit that allows fans to be connected in parallel, enabling automatic speed adjustments of normal fans when an abnormal state is detected, using a simple structure with a signal input port, signal output port, and a command output port to manage pulse width modulation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control center circuit is added to automatically adjust fan speeds during breakdown periods, then the blowing efficiency of the plural fan system is maintained, but the manufacture cost increases and the system complexity increases
Solution Approach 1:
Each fan device's speed control module autonomously monitors its own operational state and automatically adjusts its speed without external control. When a fan detects abnormal conditions (overcurrent, overheating, etc.), it self-regulates by reducing speed or shutting down, and other fans in the parallel system automatically compensate to maintain total blowing efficiency, eliminating the need for a centralized control circuit
Solution Approach 2:
The system divides the fan control function into independent segments where each fan device operates autonomously with its own speed control module. This segmentation allows each fan to independently monitor its state and adjust its speed based on local conditions, while the parallel connection enables automatic load distribution among fans without requiring centralized coordination
2Extent of automation
If a control center circuit is added to adjust PWM signals for speed control, then automatic speed adjustment is achieved, but the manufacture cost and device complexity increase
Solution Approach 1:
The speed control module within each fan device performs automatic speed adjustment autonomously by monitoring its own operational parameters (current, temperature) and adjusting the PWM signal to itself without requiring external control circuits. This self-service capability eliminates the need for costly centralized control systems while maintaining full automation
Solution Approach 2:
The speed control module is designed as a universal, multi-functional integrated circuit that combines PWM signal generation, operational state monitoring, abnormal condition detection, and automatic speed adjustment all in one component. This multi-functionality eliminates the need for separate control circuits and reduces overall system cost and complexity
3Device complexity
If fans are connected in parallel with conventional speed control modules, then the system structure is simple, but automatic speed adjustment during breakdown periods is unachievable
Solution Approach 1:
Each fan device in the parallel configuration is equipped with a self-service speed control module that automatically monitors its operational state and adjusts its speed without external intervention. When breakdown conditions are detected, the affected fan automatically reduces speed or shuts down, and other fans in the parallel system automatically increase speed to compensate, maintaining total system efficiency without complex inter-fan communication circuits
Solution Approach 2:
The speed control module incorporates feedback mechanisms that continuously monitor operational parameters (current, temperature, rotational speed) and automatically adjust the PWM signal based on the detected state. This internal feedback loop enables automatic speed adjustment during breakdown periods while keeping the system structure simple and avoiding the need for external control circuits
Data Source
AI summary
A fan device with improved speed control module includes a stator, a rotor, and a speed control module. The stator has a driving unit outputting currents for the stator to generate alternative magnetic fields and thus turn the rotor. The speed control module includes a control unit and a speed adjusting circuit, with the control unit generating a control command for the driving unit and further outputting a state signal for the speed adjusting circuit to control whether a PWM signal enters the control circuit or not.