Claw Pole Motor Ring Meandering Coil Torque
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Solution Overview
Problem
Claw-pole motors face challenges in achieving efficient torque and magnetic flux distribution due to the limitations of traditional stator and rotor designs, which can lead to magnetic interference and reduced performance in applications requiring non-magnetic shafts and high torque output.
Innovation Solution
The design incorporates a stator assembly with alternating and overlapping stator teeth and a rotor assembly featuring a non-magnetic rotary shaft with permanent magnets, along with annular and zig zag solenoidal coils that optimize magnetic flux paths and reduce leakage flux, allowing for increased peak torque and improved torque linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional stator and rotor designs are used, then the motor structure is simple, but the torque output and magnetic flux distribution are inefficient
Solution Approach 1:
The stator is divided into two separate portions (first stator portion and second stator portion) with alternating stator teeth, allowing independent optimization of each portion's magnetic flux paths. The rotor is segmented into alternating first and second rotor portions with different magnet arrangements, enabling improved torque distribution and reduced magnetic interference while maintaining a manageable structural complexity.
Solution Approach 2:
The patent introduces axial dimensionality by extending stator teeth in opposite axial directions from the first and second stator portions. This creates three-dimensional magnetic flux paths that utilize both radial and axial spaces, increasing the effective magnetic interaction area and improving torque density without significantly increasing the overall motor volume.
2Power
If permanent magnets are arranged along the rotor circumference, then electromagnetic torque is generated, but magnetic interference increases
Solution Approach 1:
Different regions of the rotor are assigned different magnetic properties: the first rotor portion contains permanent magnets arranged along the circumference for primary torque generation, while the second rotor portion has a different magnet arrangement or no magnets, creating localized magnetic zones. This local differentiation reduces overall magnetic interference while maintaining effective torque generation in critical areas.
Solution Approach 2:
The alternating stator teeth structure acts as an intermediary that selectively channels and directs magnetic flux from the permanent magnets. The stator teeth with opposite axial extensions create controlled magnetic paths that guide flux through specific regions, isolating and managing magnetic interference while maintaining useful electromagnetic interaction.
3Reliability
If stator teeth extend axially in opposite directions, then magnetic flux paths are optimized, but manufacturing complexity increases
Solution Approach 1:
The stator is manufactured as two separate portions that can be independently produced using standard manufacturing processes. Each portion has stator teeth extending in a single axial direction, which is easier to manufacture than a monolithic structure with teeth extending in opposite directions. The two portions are then assembled together, achieving the optimized magnetic flux path configuration through modular assembly rather than complex single-piece 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 enhances peak torque output by approximately 40% and improves torque linearity, enabling the motor to operate effectively in multi-phase configurations without size or weight increases, while maintaining a non-magnetic shaft for reduced interference.
Implementation Method 1
a rotor assembly (110, 210) orientated about a longitudinal axis (122) and mounted for movement about the longitudinal axis (122) relative to the stator assembly (150)... first electromagnetic windings (160) disposed in the first gap (192)... and second electromagnetic windings (170) disposed within the second gap (194)... configured to be selectively energized to exert a torque on the rotor assembly
Implementation Method 2
The rotor assembly (110, 210) may comprise a plurality of magnets (130, 230) spaced about the longitudinal axis (122). The plurality of magnets (130) may be permanently attached to a rotary shaft (120)
Data Source
AI summary
A claw-pole motor having a rotor assembly orientated about a longitudinal axis, a stator assembly having a first plurality of stator teeth and a second plurality of stator teeth orientated radially about the longitudinal axis and extending axially in opposite directions to each other and alternating about the longitudinal axis, a first gap in the stator assembly orientated about the longitudinal axis, a second gap orientated about the longitudinal axis and extending both axially and radially between the first plurality of stator teeth and the second plurality of stator teeth, first electromagnetic windings disposed in the first gap and second electromagnetic windings disposed in the second gap, the first and second windings configured to be selectively energized to exert a torque on the rotor assembly.