Rotating Electrical Machine Unequal Magnetic Pole Spacing
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Solution Overview
Problem
Rotating electrical machines experience torque pulsation, which leads to vibration, and existing technologies have not effectively addressed this issue, particularly in transverse flux machines where stator and rotor magnetic pole configurations contribute to torque pulsation.
Innovation Solution
The configuration of rotating electrical machines with annular windings and stator and rotor magnetic poles, where the distances between the centers of adjacent poles are set unequally, specifically as combinations of (Θ, Θ+Θ1/M, Θ+Θ1×2/M, ..., Θ+Θ1×(M−1)/M, with Θ1 satisfying (180°/N)<Θ1<(540°/N) in electrical angle, to offset torque pulsation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If equal distances are used between adjacent magnetic poles, then the structure is simple and manufacturing is easy, but torque pulsation occurs causing vibration
Solution Approach 1:
The patent applies asymmetry by setting unequal distances between adjacent magnetic poles. Specifically, the distance between the N-pole and S-pole is made different from the distance between the S-pole and the next N-pole. This asymmetric pole spacing creates a magnetic pole configuration that offsets torque pulsation components, thereby reducing vibration while maintaining manufacturing feasibility through a systematic design approach.
2Object-affected harmful factors
If magnetic pole widths are altered to reduce torque pulsation, then torque pulsation may be reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies local quality by varying only the spacing between magnetic poles while keeping the magnetic pole widths uniform. This localized modification affects only the inter-pole distances, not the pole dimensions themselves, thereby reducing torque pulsation through a simple geometric parameter change without increasing overall device complexity or manufacturing difficulty.
3Object-affected harmful factors
If complex pole configurations are used to reduce torque pulsation, then torque pulsation is reduced, but the structure becomes more complex and manufacturing harder
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameter of pole spacing rather than changing the magnetic pole widths or introducing complex structures. By adjusting the distances between adjacent poles to specific unequal values, the patent achieves torque pulsation reduction through a simple parameter optimization that maintains ease of manufacture while effectively addressing the vibration problem.
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 torque pulsation during both energization and non-energization, maintaining high manufacturability and output torque without altering the magnetic pole width, effectively mitigating vibration in rotating electrical machines.
Implementation Method 1
a transverse flux rotating electrical machine includes a stator which includes an annular winding extending along a rotational direction of a rotary shaft, and a rotor which is rotatable relative to the stator
Implementation Method 2
The L stator magnetic poles are disposed apart from each other in the rotational direction and facing the winding. The L rotor magnetic poles have the same polarity as each other
Data Source
AI summary
According to one embodiment, a rotating electrical machine includes an annular winding, L (L is an arbitrary integer) stator magnetic poles, and L rotor magnetic poles having the same polarity. The L stator magnetic poles are disposed apart from each other in a rotational direction and facing the winding. The L rotor magnetic poles have the same polarity as each other. The L rotor magnetic poles are disposed apart from each other in the rotational direction and configured to face the L stator magnetic poles If an order of the fundamental wave component of a torque pulsation is N, M (M≤L) distances between centers of the adjacent poles between pole centers in one set of either the L stator magnetic poles or the L rotor magnetic poles are combinations of (Θ, Θ+Θ1/M, Θ+Θ1×2/M, . . . , and Θ+1×(M−1)/M), and Θ1 satisfies the relationship (180°/N)<Θ1<(540°/N) in the notation of electrical angle.