Stator Core Oddly Shaped Tooth Magnetic Flux Balance
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Solution Overview
Problem
The shape of teeth in stator cores of rotating electrical devices, such as motors and generators, leads to uneven magnetic flux distribution, causing eccentric forces and instability in rotor rotation, noise, and vibration due to differences in magnetic flux intensity between trapezoidal and rectangular teeth.
Innovation Solution
Incorporating an oddly shaped tooth with a trapezoidal tip section and a differently shaped base section into the stator core, where the tip section is 15% to 30% of the total tooth length, to match the magnetic flux distribution of trapezoidal teeth, reducing flux imbalance and eccentric forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If trapezoidal teeth are used to improve coil density, then coil density in the slot improves, but magnetic flux distribution becomes uneven causing eccentric forces
Solution Approach 1:
The tooth structure is divided into two distinct regions: a trapezoidal tip section (15-30% of total length) that maintains narrow width for high coil density, and a rectangular base section that provides uniform magnetic flux distribution. This local differentiation allows each region to fulfill its specific function optimally.
Solution Approach 2:
The tooth is segmented into two functional parts along its length: the tip section with trapezoidal cross-section for coil accommodation, and the base section with rectangular cross-section for magnetic flux uniformity. This segmentation resolves the contradiction by assigning different geometries to different functional requirements.
2Stability of the object's composition
If rectangular teeth are used to maintain magnetic flux balance, then magnetic flux distribution improves, but coil density in the slot decreases
Solution Approach 1:
The base section of the tooth adopts rectangular geometry to ensure uniform magnetic flux distribution and balance, while the tip section maintains trapezoidal geometry for optimal coil packing. This localized geometric assignment allows the tooth to simultaneously achieve both objectives.
3Ease of operation
If mixed trapezoidal and rectangular teeth are used to facilitate coil assembly, then ease of operation improves, but magnetic flux imbalance increases causing eccentric forces
Solution Approach 1:
Instead of using completely rectangular teeth that would compromise coil density, the invention applies trapezoidal geometry locally to the tip section (15-30% of length) where coils are assembled, while maintaining rectangular geometry in the base section to ensure magnetic flux balance across all teeth.
Solution Approach 2:
The tooth is divided into tip and base sections with different geometries, allowing the tip to facilitate coil assembly like trapezoidal teeth while the base maintains magnetic flux uniformity like rectangular teeth, thus combining advantages of both tooth types.
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 configuration balances the magnetic flux between trapezoidal and oddly shaped teeth, reducing eccentric forces and maintaining stable rotor rotation while facilitating coil assembly, thus improving noise and vibration characteristics.
Implementation Method 1
the teeth include a trapezoidal tooth that has a trapezoidal cross section that is taken vertically along a central axis of a yoke and an oddly shaped tooth of which a tip section has the same shape as the trapezoidal tooth and a base section from the tip section to the yoke has a different shape from the trapezoidal tooth
Implementation Method 2
the teeth are subjected to magnetic flux from the rotor of the rotating electrical device
Data Source
AI summary
A stator core includes a cylindrical yoke and teeth that are disposed in an inner circumference surface of the yoke along its circumferential direction and that are subjected to magnetic flux from the rotor of the rotating electrical device. The teeth include a trapezoidal tooth that has a trapezoidal cross section that is taken vertically along a central axis of the yoke and an oddly shaped tooth of which a tip section has the same shape as the trapezoidal tooth and a base section from the tip section to the yoke has a different shape from the trapezoidal tooth.