Three-Phase Stator Structure for Slim Fans With Stronger Magnetic Force
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Solution Overview
Problem
Conventional slim fans face challenges in maintaining sufficient stator magnetic force, rotational speed, and air volume due to limitations in the number of silicon steel laminations and wound coils, and three-phase windings with printed coils have insufficient magnetic force.
Innovation Solution
A three-phase driven stator structure with substrates featuring through holes and metal rods, and induction coils arranged in a radial pattern, connected via electrical vias, enhances magnetic force without increasing fan height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of silicon steel laminations and wound coils is increased to improve stator magnetic force, then the magnetic force is improved, but the overall height of the fan increases
Solution Approach 1:
The patent embeds metal rods with high permeability inside the through-holes of the substrate, creating a nested structure where the metal rods are positioned within the substrate thickness. This allows the magnetic flux to be concentrated and guided through the metal rods without increasing the overall height of the fan, thereby improving stator magnetic force while maintaining a compact profile.
Solution Approach 2:
The patent changes the magnetic permeability parameter by introducing metal rods with high permeability into the substrate. This material parameter change enhances the magnetic force of the stator without requiring additional silicon steel laminations or increasing the fan height, as the high permeability metal rods efficiently conduct and concentrate the magnetic flux.
2Length of stationary object
If printed windings are used to reduce fan height, then the fan height is reduced, but the magnetic force becomes insufficient
Solution Approach 1:
The patent combines printed circuit board technology with embedded metal rods to create a composite stator structure. The substrate provides the printed winding traces while the embedded metal rods with high permeability enhance the magnetic flux concentration and strength. This composite approach maintains the slim profile of printed windings while compensating for their insufficient magnetic force through the addition of high permeability metal rods.
3Length of stationary object
If the number of silicon steel laminations is reduced to maintain slim profile, then the fan height is reduced, but the stator magnetic force decreases
Solution Approach 1:
The patent changes the magnetic permeability parameter by introducing metal rods with high permeability into the substrate. This material parameter change enhances the magnetic force of the stator without requiring additional silicon steel laminations or increasing the fan height, as the high permeability metal rods efficiently conduct and concentrate the magnetic flux.
Solution Approach 2:
The metal rods act as an intermediary element between the printed windings and the air gap. They serve as magnetic flux concentrators and guides, mediating the magnetic field generation process by channeling and strengthening the magnetic flux produced by the printed windings, thereby compensating for the reduced number of silicon steel laminations.
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 enhanced magnetic force maintains good fan rotational speed and produces sufficient air volume, overcoming the limitations of conventional slim fans.
Implementation Method 1
each of which is arranged around one of the through holes to form a radial pattern... the induction coils can have increased magnetic force
Implementation Method 2
Since every through hole on the substrates has a metal rod inserted therein, the induction coils can have increased magnetic force
Data Source
AI summary
A three-phase stator structure includes a plurality of laminated substrates, each of which is provided with a tracing layer, a plurality of through holes, and a plurality of electrical connection vias. The tracing layer consists of a plurality of induction coils, which are respectively arranged around an outer side of one of the through holes. The electrical connection vias are internally provided with an electrically conducting material, with which the induction coils on one substrate can be extended and electrically connected to the induction coils on an adjacent substrate. Every through hole has a metal rod inserted therein to enable upgraded magnetic force of the induction coils. A fan using the three-phase stator structure is also disclosed. With the three-phase driven stator structure, the fan can be slimmed while maintain good inductive-excited magnetic force and accordingly, high rotational speed and sufficient air volume.