Stator Tooth Profile With Angled Openings for Lower Parasitic Voltage
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Solution Overview
Problem
High parasitic voltages in electric machines reduce energy generating efficiency, especially as operating voltages increase with faster switching devices.
Innovation Solution
The electric machine features a stator with a tooth profile formed from laminations, including radially inwardly extending stator teeth spaced by gaps with angled openings that electrically shield the rotor, disrupting magnetic flux transfer and reducing parasitic voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If operating voltage is increased to improve power output, then power capability is improved, but parasitic voltage increases reducing energy efficiency
Solution Approach 1:
The patent applies local quality by creating openings with specific angular orientations (first angle and second angle) at different locations on the stator teeth. These localized angular features are designed to selectively block parasitic magnetic flux paths while maintaining the overall stator structure and power output capability. The different angles at different locations optimize the blocking effect for specific flux directions.
Solution Approach 2:
The openings in the stator teeth act as intermediary structures between the magnetic flux generated by the rotor and the stator windings. By introducing these angular openings, the patent creates an intermediate barrier that disrupts and blocks the parasitic magnetic flux paths, preventing the flux from directly coupling into the stator windings and causing parasitic voltages.
2Power
If stator teeth are added to increase magnetic flux transfer, then power generation is improved, but parasitic voltage paths are created
Solution Approach 1:
The patent segments the stator teeth by introducing openings that divide each tooth into multiple sections. These openings create discrete barriers within the magnetic flux path, allowing the tooth to still transfer useful magnetic flux while blocking parasitic flux paths. The segmentation disrupts continuous parasitic flux paths without completely blocking magnetic coupling.
Solution Approach 2:
The openings are designed with asymmetric angular orientations - a first angle on one side and a second angle on the other side. This asymmetric configuration is optimized to block parasitic flux paths that travel in specific directions while maintaining symmetry in the overall stator assembly. The asymmetric angles create directional blocking effects.
3Ease of manufacture
If conventional stator design is used to simplify manufacturing, then manufacturing complexity is reduced, but parasitic voltage cannot be controlled
Solution Approach 1:
The patent changes the geometric parameters of the stator teeth by introducing openings with specific angular measurements (first angle and second angle). These parameter changes are defined in the design specifications and can be incorporated into standard manufacturing processes. The angular parameters are optimized to block parasitic flux while maintaining manufacturability through conventional lamination and stacking techniques.
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 effectively lowers parasitic voltages, enhancing the energy efficiency of electric machines by disrupting magnetic flux paths between the stator and rotor.
Implementation Method 1
disrupting magnetic flux transfer and reducing parasitic voltages
Implementation Method 2
A voltage is applied to the electric machine causing the shaft to be driven resulting in a rotation of the rotor relative to a stator so as to produce electromotive force (EMF)
Data Source
AI summary
An electric machine includes a housing, a rotor rotatably mounted to the housing, and a stator mounted to the housing about the rotor. The stator includes a stator body formed from a plurality of laminations. The plurality of laminations include an outer annular surface defining a radius, an inner annular surface spaced from the rotor, and a plurality of radially inwardly extending stator teeth spaced one from another by plurality of gaps. Each of the plurality of gaps extend along the radius and include an opening exposed at the inner annular surface. The opening has a first side portion and a second side portion each extending at an angle relative to the radius.