Bearingless Motor Wire Cross-Section Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bearingless motors face challenges in improving the degree of freedom in design while maintaining required space factors for electric wires, as using common conductive wires limits the flexibility and space efficiency.
Innovation Solution
The electric motor design differs in the cross-sectional area and number of conductive wires for support and drive electric wires, optimizing the space factor and bend radius to enhance design freedom and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common conductive wires are used for both support electric wire and drive electric wire, then manufacturing is simplified, but the degree of freedom in design of electric wires is limited and space factors cannot be optimized
Solution Approach 1:
The patent divides the electric wire system into two separate segments: support electric wires and drive electric wires. Each segment uses conductive wires with specifically optimized cross-sectional areas tailored to their respective functions, allowing independent optimization of space factors and bend radii for each wire type while maintaining manufacturing feasibility through standardized slot configurations.
2Area of moving object
If the cross-sectional area per conductive wire of support electric wire is reduced to improve space factor, then the allowable bend radius increases, but electromagnetic force for support may be insufficient
Solution Approach 1:
The patent applies different cross-sectional area specifications to different wire types based on their local functional requirements. Drive electric wires use larger cross-sectional areas optimized for high current carrying capacity and electromagnetic force generation, while support electric wires use smaller cross-sectional areas optimized for space efficiency and appropriate bend radius, with each type's properties locally optimized for its specific role.
3Force
If the cross-sectional area per conductive wire of drive electric wire is increased to improve electromagnetic force, then the space factor decreases, but design freedom is improved
Solution Approach 1:
The patent systematically varies the cross-sectional area parameter of conductive wires based on their functional requirements. Drive electric wires are designed with larger cross-sectional areas to maximize electromagnetic force generation, while support electric wires use smaller cross-sectional areas to optimize space utilization. This parameter optimization is achieved within standardized slot geometries, balancing electromagnetic performance with spatial constraints.
4Adaptability or versatility
If different cross-sectional areas are used for support and drive electric wires, then space factors and bend radii are optimized, but manufacturing complexity increases
Solution Approach 1:
The patent achieves differentiated wire performance while maintaining manufacturing universality by using standardized slot configurations that can accommodate both types of wires. The slot design serves multiple functions: it provides mechanical support, defines the magnetic path, and accommodates wires of different cross-sectional areas through standardized geometric parameters. This universal slot structure simplifies manufacturing despite the diversity in wire specifications.
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 approach allows for improved space factors and reduced bend radii, increasing the electromagnetic force and torque, while reducing the size of the coil end portion and enhancing the critical speed of the drive shaft.
Implementation Method 1
a support electric wire (60) that is constituted by one or more conductive wires (61), that is disposed so as to pass through a plurality of slots (53) respectively formed between the plurality of teeth (52), and that forms a winding portion that generates an electromagnetic force for supporting the rotor (30) in a non-contact manner by being energized
Implementation Method 2
a drive electric wire (70) that is constituted by one or more conductive wires (71), that is disposed so as to pass through the plurality of slots (53), and that forms a winding portion that generates an electromagnetic force for rotating the rotor (30) by being energized
Data Source
AI summary
The stator includes a stator core, a support electric wire formed by one or more conductive wires, and a drive electric wire formed by one or more conductive wires. The stator core includes an annular shaped back yoke and a plurality of teeth on an inner periphery of the back yoke. The support electric wire is disposed so as to pass through a plurality of slots respectively formed between the teeth, and forms a winding portion that generates an electromagnetic force for supporting the rotor in a non-contact manner by being energized. The drive electric wire is disposed so as to pass through the plurality of slots, and forms a winding portion that generates an electromagnetic force for rotating the rotor by being energized. A cross-sectional area per conductive wire of the support electric wire differs from a cross-sectional area per conductive wire of the drive electric wire.