Stator With Double Oblique Teeth And Staged Insulation
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Solution Overview
Problem
Electric machines with existing stator designs experience irregular torque generation and subsequent sound emissions and vibrations due to linear oblique tooth arrangements, which lead to insulation issues when angles change, causing reduced insulation properties and increased sound and vibration excitations.
Innovation Solution
A stator design with teeth configured in a double oblique arrangement, featuring a third region with different angles and electrical insulation, allowing for two-stage insulation and avoiding insulation tears by using selective weakening or separate insulation elements, ensuring consistent torque output and reduced sound and vibration emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If teeth are arranged with a linear oblique arrangement in one direction, then sound emissions are reduced, but irregular torque generation occurs causing torsional vibrations and further sound emissions
Solution Approach 1:
The patent applies asymmetry by using a double oblique arrangement where teeth are inclined at different angles in different axial regions. The first region has teeth inclined at a first oblique angle, the third region has teeth inclined at a second oblique angle (different from the first), and the second region has teeth inclined at a third oblique angle. This asymmetric configuration balances the magnetic forces and eliminates irregular torque generation while maintaining sound emission reduction.
Solution Approach 2:
The stator is segmented into three distinct axial regions, each with teeth inclined at different oblique angles. This segmentation allows the patent to address both sound emission reduction and torque uniformity by creating a double oblique arrangement that compensates for the harmful effects of a single-direction oblique arrangement.
2Object-generated harmful factors
If teeth are embodied with a double oblique arrangement, then torque uniformity is improved, but insulation problems occur when the oblique angle changes
Solution Approach 1:
The patent applies preliminary action by pre-inclining the teeth at different oblique angles in different axial regions during manufacturing. This preliminary configuration of the magnetic circuit ensures that the double oblique arrangement is established before operation, providing torque uniformity while the insulation system is designed to accommodate these predetermined angle changes.
Solution Approach 2:
The patent applies local quality by providing electrical insulation specifically in the third region where the oblique angle changes from the first angle to the second angle. This localized insulation approach addresses the insulation problem at the critical transition zone without compromising the overall double oblique arrangement and torque uniformity.
3Reliability
If insulation is implemented in the third region with changing oblique angles, then insulation integrity is maintained, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by providing electrical insulation specifically in the third region where the oblique angle transitions from the first angle to the second angle. This localized approach maintains insulation integrity only where needed, rather than insulating the entire stator, thereby reducing overall manufacturing complexity while ensuring reliability at the critical transition zone.
Data Source
AI summary
A stator is provided for an electric machine. The stator includes a plurality of teeth which are each designed such that a winding can be arranged on them. The teeth are at a first angle in relation to the longitudinal axis in a first region which extends in the axial direction of the stator. The teeth are at a second angle, which differs from the first angle, in relation to the longitudinal axis in a second region which extends in the axial direction of the stator. A third region in which the teeth are electrically insulated is arranged between the first region and the second region.