Stepping Motor Stator Tapered Connecting Sections
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Solution Overview
Problem
The existing stator designs for electric motors suffer from high residual magnetic flux transfer between stator parts due to thick connecting sections, which impairs the efficiency and precision of stepping motors.
Innovation Solution
The stator design reduces the thickness of connecting sections in both axial and radial directions using efficient methods like stamping, creating thin isthmus-like sections that minimize magnetic flux transfer, and is produced as an integral stator body to reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the connecting sections are made thick to ensure mechanical strength and alignment, then the structural stability is improved, but the magnetic flux transfer between stator parts increases
Solution Approach 1:
The patent applies local quality by making the connecting sections have different thicknesses in different regions. Specifically, the connecting sections have reduced thickness in the axial direction compared to the radial direction, creating a non-uniform cross-section that locally minimizes magnetic flux transfer paths while maintaining mechanical integrity where needed.
Solution Approach 2:
The patent changes the geometric parameters of the connecting sections by reducing their thickness in the axial direction. This parameter change directly reduces the cross-sectional area available for magnetic flux transfer, thereby decreasing the harmful magnetic coupling between adjacent stator parts while maintaining sufficient mechanical strength.
2Object-generated harmful factors
If the thickness of connecting sections is reduced to minimize magnetic flux transfer, then the magnetic flux transfer is decreased, but the mechanical strength and alignment capability are compromised
Solution Approach 1:
The connecting sections are designed with non-uniform thickness, being thinner in the axial direction (where magnetic flux transfer occurs) and maintaining adequate thickness in the radial direction (where mechanical strength is required). This local differentiation allows simultaneous optimization of both magnetic isolation and mechanical strength.
Solution Approach 2:
The patent addresses the mechanical strength concern by maintaining adequate radial thickness of the connecting sections while reducing only the axial thickness. This dimensional differentiation allows the connecting sections to provide sufficient mechanical support in the radial direction while minimizing magnetic flux transfer paths in the axial direction.
3Object-generated harmful factors
If the connecting sections are made thin in axial direction, then the magnetic flux transfer is reduced, but the production complexity increases
Solution Approach 1:
The patent merges the stator parts and connecting sections into a single integral body formed from one stator sheet. The connecting sections are created as continuous extensions of the stator parts during the same stamping process, eliminating the need for separate manufacturing and assembly operations. This integration reduces production complexity despite the non-standard thin geometry.
Solution Approach 2:
The patent replaces traditional mechanical joining methods (such as welding or bolting separate stator parts) with a single-stamping process that forms the entire stator body including the thin connecting sections in one operation. This substitution of manufacturing methodology simplifies production while achieving the required geometric precision.
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 approach significantly reduces magnetic flux transfer, enhancing the efficiency and precision of electric motors while allowing for cost-effective mass production of stators.
Implementation Method 1
the transfer of the magnetic flux between the stator parts is significantly reduced
Data Source
AI summary
Disclosed is a stator for an electric motor, especially a stepping motor, comprising at least two stator parts (14, 16, 18) which jointly surround a stator hole (12) and are interconnected, connecting sections being provided for connecting the stator parts (14, 16, 18). The stator is characterized in that the connecting sections (13, 15, 17) are tapered relative to the adjacent sections of the adjoining stator parts (14, 16, 18) in an axial direction, parallel to the axis (A) of the stator hole (12), and form isthmi between the adjoining stator parts.