Torque Motor Pole Piece Segmentation for Magnetic Loss Reduction
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Solution Overview
Problem
Torque motors face challenges in achieving high precision and minimizing gaps between magnetic components due to material property changes under stress, which limits their performance and requires precise manufacturing without interference fits.
Innovation Solution
The use of rigid members, such as pins or cavities, to secure separate sections of the pole piece together, reducing magnetic losses and eliminating the need for magnetic shunts by aligning holes or cavities to prevent relative movement and enhance magnetic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If interference or press fit is used to connect pole piece sections, then manufacturing precision is improved, but material property changes under stress cause reliability deterioration
Solution Approach 1:
The pole piece is divided into multiple separate sections that are connected through cavities and rigid members, allowing each section to be manufactured independently with precise tolerances while avoiding stress-induced material property changes associated with interference fits
Solution Approach 2:
Rigid members are introduced as intermediary elements that connect pole piece sections through cavities, providing stable mechanical connection without requiring interference or press fits that cause material property changes
2Manufacturing precision
If tight tolerances are used to minimize gaps between magnetic components, then manufacturing precision is improved, but device complexity increases due to assembly difficulties
Solution Approach 1:
The pole piece is segmented into multiple sections with cavities that accommodate rigid members, enabling precise gap control between magnetic components while simplifying assembly through modular construction and alignment features
Solution Approach 2:
The design transitions from requiring tight tolerance assemblies to using cavities with rigid members that provide mechanical alignment and positioning, changing the assembly parameters from tolerance-dependent to feature-dependent
3Reliability
If magnetic shunts are used to connect pole piece sections, then reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
The cavity structure and rigid member connection are merged into a single integrated feature of the pole piece sections, eliminating the need for separate magnetic shunt components while maintaining magnetic circuit integrity
Solution Approach 2:
The cavity-rigid member structure serves multiple functions simultaneously: providing mechanical connection between sections, ensuring precise alignment, and maintaining magnetic circuit continuity, replacing the specialized function of magnetic shunts
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 improves torque motor performance by reducing magnetic losses, eliminating the need for magnetic shunts, and simplifying manufacturing, while ensuring precise alignment and stability.
Implementation Method 1
the components that are used to create the magnetic field around the armature 18 must be manufactured to a high precision
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
There is provided a pole-piece (130) for a torque motor (100), the pole-piece (130) comprising a first section (132) formed separate from a second section (134), wherein the first section (132,132') is held in position with respect to the second section (134,134') using one or more rigid members (150,150').