Double-Inclined Rotor Pole Module for Cogging Torque Control
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Solution Overview
Problem
Permanent magnet generators experience torque fluctuations and vibrations due to cogging torque, which can affect stability, and inclined pole arrangements often cause additional axial excitation leading to abnormal vibrations.
Innovation Solution
A magnetic pole module with symmetrically arranged magnetic steel components on a base plate, forming a double inclined pole arrangement, is installed on a rotor support to reduce cogging torque and restrain axial excitation, improving stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional pole arrangements are used, then the structure is simple, but torque fluctuations and vibrations occur affecting stability
Solution Approach 1:
The patent applies segmentation by dividing the rotor's magnetic pole structure into multiple independent magnetic pole modules. Each magnetic pole module contains permanent magnets arranged in a specific inclined configuration, and multiple such modules are distributed around the rotor circumference. This segmented approach allows each module to contribute to the overall double inclined pole arrangement, enabling the rotor to achieve reduced cogging torque and axial excitation through the collective effect of multiple segmented units while maintaining manufacturing feasibility.
Solution Approach 2:
The patent transitions from conventional radial pole arrangements to a double inclined pole arrangement by introducing an axial dimension to the pole configuration. The magnetic pole modules are arranged not only radially but also inclined at specific angles relative to both the radial and axial directions. This dimensional change creates a three-dimensional pole arrangement where the inclination angles are carefully selected to produce offsetting axial excitations, thereby improving operational stability by eliminating vibrations that would occur with simpler two-dimensional arrangements.
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
The solution effectively reduces cogging torque and axial excitation, enhancing the operational stability and reliability of permanent magnet generators by creating a double inclined pole arrangement that offsets adverse axial excitation.
Implementation Method 1
the magnetic steel component includes a plurality of magnetic steels arranged side by side in a side of the first direction from the second center line and at a predetermined angle in the second direction
Implementation Method 2
each pair of magnetic steel components is symmetrically distributed on the first surface relative to the second center line
Implementation Method 3
cogging torque is an inherent phenomenon of a permanent magnet generator, and is the magnetic reluctance torque produced by the interaction between the permanent magnet of a rotor and the cogging of a stator core
Data Source
AI summary
A magnetic pole module and a rotor for a permanent magnet generator are provided. The magnetic pole module includes a base plate having a first surface and a second surface arranged opposite to each other, the base plate has a first center line extending in the first direction and a second center line extending in the second direction, the first direction is intersected with the second direction, the first center line is parallel to the central axis of the permanent magnet generator; at least one pair of magnetic steel components is fixed on the base plate, and each pair of magnetic steel components is symmetrically arranged on the first surface with respect to the second center line, each magnetic steel component includes multiple magnetic steels arranged side by side along a side of the first direction from the second center line and arranged at a predetermined angle in the second direction.