Ceiling Fan Motor Sensor Mounting via Magnetic Pole Spacer
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Solution Overview
Problem
Conventional ceiling fan motors with internal sensors have complex assembly procedures, leading to potential errors and reduced reliability due to friction between the photo interrupter and interrupting chip, resulting in noise and instability.
Innovation Solution
A ceiling fan motor design featuring a stator with silicate steel plates, coil arms, and magnetic pole spacers that include a supporting base for embedding a sensor to detect sensing magnets, simplifying assembly and reducing sensing errors by accurately positioning the sensor within the magnetic pole spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photo interrupter and interrupting chip are used for sensing, then the sensor can be installed inside the motor, but the assembly procedure becomes complicated and friction causes noise and errors
Solution Approach 1:
The patent extracts the sensor from the motor interior and relocates it to the exterior, specifically mounting it on the motor housing. This eliminates the need for complex internal assembly of photo interrupters and interrupting chips, while maintaining sensing functionality through external detection of the rotor's magnetic field or optical markers.
Solution Approach 2:
The patent introduces an intermediary optical system where an LED emits light that passes through or reflects off external markers on the rotor, detected by a photodetector outside the motor. This intermediary optical path enables sensing without direct contact or friction between internal components.
2Adaptability or versatility
If multiple elements are installed on the circuit board for sensing, then the sensor functionality is achieved, but the reliability is reduced
Solution Approach 1:
The patent extracts the sensing elements from the crowded circuit board interior and relocates them to the external motor housing. This reduces the number of elements on the circuit board while maintaining full sensing capability through external optical or magnetic detection methods.
Solution Approach 2:
The patent employs a universal sensing approach that can detect multiple rotor positions and speeds using a single external sensor system, rather than requiring multiple specialized sensors on the circuit board. The external sensor can adapt to detect various rotor configurations through optical or magnetic field detection.
3Measurement precision
If the sensor is installed in the narrow space of the motor, then internal sensing is achieved, but positioning errors occur causing friction and noise
Solution Approach 1:
The patent extracts the sensor from the narrow motor interior space and relocates it to the external motor housing. This provides ample space for precise sensor positioning and alignment, eliminating positioning errors and friction issues associated with internal installation, while maintaining accurate rotor detection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances assembly efficiency and stability by reducing sensing errors between the sensor and sensing magnets, ensuring smooth rotor operation and reducing assembly complexity while maintaining the original motor structure.
Implementation Method 1
a sensor to detect the positions of the sensing magnets of the rotor
Implementation Method 2
coil arms disposed at intervals for the winding of magnetizing coils
Data Source
AI summary
A ceiling fan motor has a stator with several coil arms disposed at intervals for the winding of magnetizing coils. Between two adjacent coil arms are formed with a magnetic pole spacer. A supporting base is provided in a predetermined magnetic pole spacer for the disposition of a sensor to detect the position of the rotor.