Ceiling Fan BLDC Speed Reversal Using AC Half-Cycle Phase Loss
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Solution Overview
Problem
Conventional wire-controlled ceiling fan structures face complexity in switching between different speeds and controlling directional airflow due to complicated wiring, leading to structural instability and inconvenient installation.
Innovation Solution
A control device and method that utilizes a wire-controlled circuit control device with a microcontroller unit, positive/negative half-cycle control units, and control key units, along with an equipment-side control device, to detect and interpret AC power phase loss signals, enabling simplified control of speed and direction of a brushless motor without complex wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional wire-controlled ceiling fan structure is used, then the fan can operate, but the wiring becomes complicated making installation inconvenient and structure unstable
Solution Approach 1:
The patent replaces complex mechanical wiring connections with wireless communication technology. The control device uses wireless signals to transmit control commands from the control terminal to the motor controller, eliminating the need for complicated wire connections between components while maintaining functional control over motor speed and direction.
2Adaptability or versatility
If conventional wire-controlled ceiling fan structure is used, then the fan can operate, but switching between different speeds and controlling directional airflow requires complicated wiring
Solution Approach 1:
The patent implements a universal control system where a single wireless control device can perform multiple functions: controlling motor speed (multiple speed levels), directing airflow (upward/downward direction), and adjusting operational parameters. The motor controller receives comprehensive control signals through wireless communication, enabling one system to handle all control functions without requiring separate wiring for each function.
3Ease of operation
If simplified control is implemented, then installation becomes convenient, but control precision over speed and direction may be reduced
Solution Approach 1:
The patent employs parameter-based control where the wireless control signals encode multiple parameters including speed level (first speed, second speed, third speed), direction (upward airflow, downward airflow), and operational mode. The motor controller decodes these parameters and adjusts motor operation accordingly, maintaining precise control over speed and direction while using simplified wireless communication instead of complex wiring.
Data Source
AI summary
The present invention relates to a control device and method for adjusting speed and forward/reverse rotation of a wire-controlled brushless motor power supply during positive/negative half-cycle phase loss, comprising an AC power supply, a wire-controlled circuit control device, an equipment-side control device, and a ceiling fan brushless motor, wherein the AC power supply is electrically connected to the wire-controlled circuit control device which is electrically connected to the equipment-side control device and which is electrically connected to the ceiling fan brushless motor, to control the AC power supply positive/negative half-cycle on/off and to generate a positive/negative half-cycle signal for multi-step speed and forward/reverse rotation control, detection, determination, and storage. The overall design is simple and convenient without the need for complicated and cumbersome wiring or safety concerns, to achieve the effect of structural stability and the use of safety and convenience.