Stator Rotor Structures Reducing Detent Torque
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Solution Overview
Problem
Conventional electric motors and generators experience significant detent torque due to the interaction between high permeability field poles and permanent magnets, which increases with larger gaps between field pole elements, but reducing these gaps leads to flux leakage, posing a design challenge in minimizing detent torque while maintaining efficiency.
Innovation Solution
The design incorporates field pole members arranged coaxially with an overlap portion that includes a plane aligned with the axis of rotation, featuring conical magnets and active field pole members with coils to minimize magnetic flux leakage and detent torque by optimizing the air gap and flux path configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the gap between field pole elements is increased, then detent torque is reduced, but magnetic flux leakage increases
Solution Approach 1:
The patent introduces a skew angle dimension to the field pole members, tilting them relative to the axial direction. This dimensional change allows the magnetic flux to follow a more gradual path across the air gap, reducing both detent torque and flux leakage simultaneously by distributing the magnetic interaction over a longer axial distance
Solution Approach 2:
The patent modifies the geometric parameters of the field pole members by introducing skew angles and optimizing the gap dimensions. By changing these physical parameters, the magnetic field distribution is optimized to reduce detent torque while minimizing flux leakage, achieving a balance between the two competing requirements
2Loss of energy
If the gap between field pole elements is decreased, then magnetic flux leakage is reduced, but detent torque increases
Solution Approach 1:
By introducing skew angles to the field pole members, the patent adds an axial dimension to the magnetic flux path. This allows the flux to travel a longer effective distance with a smaller radial gap, reducing leakage while the skewed configuration distributes the magnetic attraction forces to reduce detent torque
3Object-generated harmful factors
If field pole members are oriented to form overlap portions, then detent torque is reduced, but device complexity increases
Solution Approach 1:
The patent employs asymmetric orientation of field pole members with different skew angles relative to the axial direction. This asymmetric configuration creates overlapping magnetic fields that counteract detent torque, while the systematic application of asymmetry keeps the manufacturing process manageable
Solution Approach 2:
The stator structure is divided into multiple discrete field pole members, each independently oriented with specific skew angles. This segmentation allows for optimized detent torque reduction through overlapping fields while maintaining modular construction that simplifies assembly and manufacturing
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 reduces detent torque while maintaining high torque output and efficiency by minimizing magnetic flux leakage and optimizing the interaction between conical magnets and field pole members, allowing for compact and high-performance motor designs.
Implementation Method 1
a first field pole member and a second field pole member... configured to minimize magnetic flux leakage and detent torque by optimizing the air gap and flux path configuration
Implementation Method 2
The design incorporates field pole members arranged coaxially with an overlap portion that includes a plane aligned with the axis of rotation, featuring conical magnets and active field pole members with coils to minimize magnetic flux leakage and detent torque
Data Source
AI summary
Embodiments of the invention relate generally to electric motors, alternators, generators and the like, and more particularly, to stator structures and rotor-stator structures for motors that can be configured to, for example, reduce detent.