Brushless Motor Angle Feedback for Long-Life Fan Head Rotation
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Solution Overview
Problem
Current fans with swingable heads using stepping motors have a short service life, making it difficult to meet user requirements for long-term control of rotation angles.
Innovation Solution
A method and device utilizing a brushless motor with an angle feedback device to control the rotation angle of the fan's swinging head, where the angle feedback device provides parameters used to calculate and adjust the current rotation angle to a preset target angle, ensuring accurate and long-lasting control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stepping motor is used to control the rotation angle of the swinging head, then the rotation angle can be controlled freely, but the service life is short (only thousands of hours)
Solution Approach 1:
The patent replaces the mechanical stepping motor system with a brushless motor system. The brushless motor eliminates mechanical contact and wear, thereby extending service life while maintaining angular control capability through electronic commutation and feedback control.
Solution Approach 2:
The patent introduces an angle feedback device that provides real-time feedback on the swinging head's rotation angle. This feedback enables precise control of the brushless motor to achieve the desired rotation angle, replacing the open-loop control of stepping motors with a closed-loop system that offers both longevity and precision.
2Duration of action of stationary object
If a stepping motor is used to control the rotation angle, then direct control is achieved, but it is difficult to meet user requirements for long-term control
Solution Approach 1:
The patent replaces the mechanical stepping motor system with a brushless motor system. The brushless motor eliminates mechanical contact and wear, thereby extending service life while maintaining angular control capability through electronic commutation and feedback control.
Solution Approach 2:
The patent changes the fundamental operating parameters of the motor system by transitioning from a stepping motor (which relies on mechanical steps and has limited life) to a brushless motor (which uses electronic commutation and has no mechanical contact). This parameter change enables long-term continuous operation while maintaining precise angular control through the feedback system.
Data Source
AI summary
A method and a device are provided for controlling a rotation angle of a swinging head of a fan. The method may be applied in a fan adopting a brushless motor. An angle feedback device is arranged on the swinging head, and the swinging head is driven by the brushless motor to rotate. The device may acquire a parameter outputted by the angle feedback device, where the parameter varies with rotation of the swinging head. The device may calculate a current rotation angle of the swinging head according to the parameter outputted by the angle feedback device and a preset correspondence relationship between parameters and angles. The device may control the swinging head to rotate according to the current rotation angle of the swinging head and a preset target rotation angle.