Motor Commutator Magnet Fixing and Flux Optimization
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Solution Overview
Problem
Existing motors face challenges in fixing commutator magnets effectively, leading to inefficiencies in assembling and output, and magnetic saturation in claw poles reduces the motor's performance.
Innovation Solution
A motor design that includes stacked rotor cores with alternately arranged claw poles and a field magnet, where the commutator magnet is positioned on the outer circumference to face surfaces with the same polarity, and anisotropically oriented to function as different magnetic poles, improving assembly efficiency and reducing magnetic saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If commutator magnets are added to reduce leakage flux, then motor output is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The commutator magnet is integrated into the rotor core structure, merging the commutator function with the rotor body. This reduces the number of separate components and simplifies assembly while maintaining the ability to reduce leakage flux and improve motor output.
Solution Approach 2:
The rotor core is designed to serve multiple functions: it provides the structural backbone, contains the claw poles for magnetic flux paths, and incorporates the commutator magnet for flux management. This multi-functionality reduces component count and assembly complexity while achieving the desired output improvement.
2Power
If multiple separate magnets are used in the rotor, then magnetic flux distribution is improved, but assembling efficiency decreases
Solution Approach 1:
Multiple magnet functions are combined into a single integrated commutator magnet component that is assembled as one unit with the rotor core, rather than installing multiple separate magnets individually. This maintains effective magnetic flux distribution while significantly improving assembling efficiency.
Solution Approach 2:
The commutator magnet is pre-positioned and integrated into the rotor core assembly during manufacturing, so that during final assembly, the entire rotor unit is installed as a complete component. This preliminary integration eliminates time-consuming individual magnet installation steps.
3Power
If claw poles are used to generate magnetic flux, then motor rotation is enabled, but magnetic saturation occurs reducing effective flux ratio
Solution Approach 1:
The commutator magnet acts as an intermediary element between the field magnet and the claw poles. It modifies and optimizes the magnetic flux distribution before it reaches the claw poles, preventing saturation while maintaining the rotation capability enabled by the claw pole structure.
Solution Approach 2:
The commutator magnet changes the magnetic flux parameters (distribution, density, path) to optimize the flux that reaches the claw poles. By adjusting these parameters, the system achieves effective rotation while avoiding the magnetic saturation that would otherwise reduce the effective flux ratio.
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 motor achieves improved assembly efficiency, reduced component count, and enhanced output by effectively fixing commutator magnets and optimizing magnetic flux distribution.
Implementation Method 1
The field magnet is magnetized in the axial direction so that the claw poles of the first rotor core and the claw poles of the second rotor core function as different magnetic poles in the circumferential direction
Implementation Method 2
The commutator magnets reduce leakage flux of the rotor
Implementation Method 3
The coil generates a rotating magnetic field that acts on the rotor
Implementation Method 4
A stator includes a stator core and a coil wound around the stator core. The coil generates a rotating magnetic field that acts on the rotor
Data Source
AI summary
A rotor of a motor includes first and second rotor cores, a field magnet, and a commutator magnet. The first and second rotor cores each include a core base and a plurality of claw poles. The claw poles of the first rotor core and the claw poles of the second rotor core are alternately arranged in a circumferential direction. The field magnet is located between the core bases. The field magnet is magnetized in an axial direction so that the claw poles of the first rotor core and the claw poles of the second rotor core function as different magnetic poles in the circumferential direction. The commutator magnet is located on an outer circumference of the field magnet around the claw poles. The commutator magnet is magnetized so that surfaces having the same polarity face each other between the claw poles and the commutator magnet.