Field Winding Motor Axial Core Segmentation for Stiffness
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Solution Overview
Problem
Existing field winding type motors suffer from low stiffness and vulnerability to external impacts during high-speed rotation due to the brittleness and low strength of soft magnetic composite materials used in their cores.
Innovation Solution
The motor employs different material cores, specifically using soft magnetic composite materials for the primary stator and rotor cores and stainless materials for secondary cores, assembled in axial directions of the stator and rotor bobbins, along with a coupling member for enhanced coupling strength and assembly ease, to reinforce low-stiffness areas and improve resistance to external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If soft magnetic composite materials are used for stator and rotor cores, then magnetic flux generation is improved, but stiffness and resistance to external impacts deteriorate
Solution Approach 1:
The stator and rotor cores are divided into multiple segments (first core and second core) that can be assembled together. This segmentation allows the use of brittle SMC materials while maintaining overall structural integrity through proper assembly design, resolving the contradiction between magnetic performance and mechanical strength.
Solution Approach 2:
The second core is inserted into the first core in a nested configuration, with the second core providing internal reinforcement. This nested structure allows the brittle SMC material to be supported by the inner core, improving stiffness and impact resistance while maintaining magnetic flux generation capability.
2Strength
If metal cores are assembled in axial directions of stator and rotor bobbins, then stiffness during high speed rotation is improved, but device complexity increases
Solution Approach 1:
The core assembly is segmented into first and second cores that are assembled in the axial direction. This segmentation simplifies the manufacturing of each individual core component while achieving the desired stiffness through their combined structure, reducing overall device complexity.
Solution Approach 2:
The cores are assembled in the axial direction rather than radially, utilizing the axial dimension for structural reinforcement. This dimensional approach simplifies the assembly process and reduces complexity compared to radial assembly methods.
3Strength
If coupling members are used to assemble cores and rotor cover, then coupling strength is improved, but manufacturing complexity increases
Solution Approach 1:
Coupling members are introduced as intermediary elements between the cores and rotor cover, providing a simple and effective means to achieve strong coupling. These coupling members facilitate easy assembly and disassembly while ensuring strong mechanical connection, improving ease of manufacture.
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 the motor's efficiency and stiffness during high-speed rotation by providing a strong coupling structure and maintaining magnetic flux directionality, while preventing damage from external forces.
Implementation Method 1
a bobbin assembly coupled along a gap between the first stator core and the first rotor core and generating a magnetic flux when power is applied thereto
Data Source
AI summary
Provided is a field winding type motor capable of having high efficiency and reinforcing a portion having low stiffness during high speed rotation by respectively assembling metal cores in axial directions of a stator bobbin and a rotor bobbin.