Linear Motor Mover Weight Reduction via Grooved Magnetic Ladder
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Solution Overview
Problem
Conventional linear motors face challenges in reducing the mass of the mover while minimizing magnetic flux shunting and enhancing thrust, leading to suboptimal response characteristics due to the heavy load and discontinuities in the magnetic circuit.
Innovation Solution
The design incorporates ladder-shaped magnetic material members with grooves, arranged alternately with magnets on the secondary side, and magnetic pole pieces with coils on the primary side, which reduces the weight of the mover, suppresses magnetic flux shunting, and improves thrust by optimizing the magnetic circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are fixed to a ladder-shaped member, then the magnets are supported, but the mass of the mover increases
Solution Approach 1:
The invention extracts the ladder-shaped support member from the mover structure, eliminating it completely. Instead, magnets are directly fixed to the mover body or held by simple retainers, removing the heavy intermediate support structure while maintaining magnet positioning and support functionality.
Solution Approach 2:
The invention applies local magnetic material features only where needed - specifically at magnet mounting positions or in localized regions - rather than using a complete ladder-shaped structure throughout. This provides support and magnetic flux management only where required, reducing overall mover mass.
2Reliability
If a heavy mover is used, then the magnets are supported, but the response characteristics deteriorate
Solution Approach 1:
By removing the heavy ladder-shaped support member, the mover mass is reduced, which directly improves acceleration and response characteristics. The magnets are supported through alternative lighter means, achieving both support reliability and improved dynamic response.
Solution Approach 2:
The invention changes the structural parameters of the mover by eliminating intermediate support members and adopting a more integrated, lighter design. This parameter change reduces inertial mass while maintaining structural integrity and magnet support, thereby improving response characteristics.
3Device complexity
If magnets are arranged without grooves, then the structure is simple, but magnetic flux shunting occurs
Solution Approach 1:
The invention introduces grooves only in specific locations where magnetic flux shunting occurs - typically between adjacent magnets or at critical flux paths. This localized feature prevents flux shunting without requiring a completely complex structured design, balancing simplicity and performance.
Solution Approach 2:
The grooves create a controlled porous or segmented magnetic circuit structure that guides magnetic flux through intended paths while preventing shunting. This approach uses geometric features rather than complex materials to control magnetic flux behavior.
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 effectively reduces the weight of the mover, enhances thrust, and improves response characteristics by minimizing magnetic flux shunting and deformation, resulting in a more efficient and responsive linear motor.
Implementation Method 1
a common coil wound around each of the magnetic pole pieces
Implementation Method 2
generate great magnetic attraction acting between a mover including a magnet array, and a stator
Implementation Method 3
a magnetic material core interconnecting the magnetic pole pieces
Data Source
AI summary
Provided is a highly responsive linear motor that can be constructed by reducing the weight of a mover. In order to attain this object, the linear motor includes a secondary side in which magnets and ladder-shaped members of a magnetic material are arranged in alternate manner in a rectilinearly moving direction of the mover, the ladder-shaped members each holding one of the magnets; and a primary side that includes magnetic pole pieces arranged in close proximity to the secondary side from above and below in a direction perpendicular to the rectilinearly moving direction with a common coil wound around each of the magnetic pole pieces, the primary side including a magnetic material core interconnecting the magnetic pole pieces; wherein the ladder-shaped members of a magnetic material are formed with grooves.