Blower Fan Stator Support Expanded Portion for Unbalance Correction
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Solution Overview
Problem
Blower fans with inner-rotor motors face challenges in unbalance correction due to increased axial dimensions and vibrations at high speeds, as existing designs lack sufficient space for unbalance correction, leading to inefficient assembly and increased vibrations.
Innovation Solution
The blower fan design includes an expanded portion on the stator support portion opposite to the impeller cup's opening-end portion, providing increased distance for unbalance correction and minimizing vibrations by allowing easier access for balance adjustments after assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an inner-rotor motor is used to reduce moment of inertia and vibrations, then rotational speed can be increased without significant vibration increase, but the motor portion has increased radial dimension due to larger number of components
Solution Approach 1:
The bearing support portion and stator support portion are merged into a single integral support portion, reducing the total number of components in the motor assembly. This integration maintains the inner-rotor motor configuration for reduced moment of inertia while eliminating the need for separate support structures that would increase radial dimension.
Solution Approach 2:
The integral support portion serves multiple functions simultaneously: it supports the bearings, holds the stator, and provides structural integrity for the motor assembly. This multi-functionality reduces the number of separate components needed, thereby reducing the radial dimension while maintaining the inner-rotor configuration for high-speed operation.
2Ease of operation
If components are arranged in radial direction to reduce axial dimension, then unbalance correction becomes difficult after assembly, but if axial dimension is increased to allow unbalance correction, then the rotating body becomes more prone to displaced center of gravity
Solution Approach 1:
The expanded portion extends in the axial direction from the support portion, creating additional space for unbalance correction tools and procedures. This dimensional extension provides access to the rotating body for balance adjustments without increasing the radial dimension, thereby maintaining center of gravity stability while enabling easy unbalance correction.
Solution Approach 2:
The support portion is segmented into functional regions: the main support structure and the expanded portion for unbalance correction. This segmentation allows the expanded portion to provide access for balance adjustments while the main structure maintains structural integrity and supports the rotating body, preventing displaced center of gravity.
3Ease of manufacture
If the rotating body is defined as a united body for assembly, then unbalance correction must be performed after assembly, but unbalance correction is more difficult when the rotating body has large axial dimension
Solution Approach 1:
The expanded portion extends axially from the support portion, creating additional workspace in the axial direction for unbalance correction procedures. This allows tools and operators to access the rotating body more easily, reducing the difficulty of unbalance correction while maintaining the united body assembly approach.
Solution Approach 2:
The expanded portion acts as an intermediary space between the assembled rotating body and the operator/tools. It provides a workspace that facilitates unbalance correction procedures without requiring disassembly of the united body, thereby maintaining ease of manufacture while improving ease of operation for balance adjustments.
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
This design enables easy unbalance correction and reduces vibrations even at high speeds, ensuring stable operation by providing a sufficient space for balance adjustments without compromising the radial dimension or increasing the number of components.
Implementation Method 1
a motor (30) arranged to rotate the impeller (20)
Implementation Method 2
A bearing support portion (50) arranged to support the shaft (10) through bearings (60)
Data Source
AI summary
A motor arranged to rotate an impeller includes a rotor magnet fixed to a shaft, and a stator arranged opposite to the rotor magnet. The motor is arranged on an axially lower side of an impeller cup. The stator is fixed to an inner circumferential surface of a stator support portion. An opening-side end portion of the impeller cup is arranged opposite to an upper surface of the stator support portion. The upper surface of the stator support portion includes an expanded portion defined in a portion thereof which is opposed to the opening-side end portion of the impeller cup. The expanded portion is preferably located a greater distance from the opening-side end portion of the impeller cup than a distance between the opening-side end portion and a remaining portion of the upper surface of the stator support portion.