Cylindrical Bonded Magnet Structure for Linear Motors
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Solution Overview
Problem
Conventional columnar or tubular alternately-magnetized multipolar magnets face challenges in efficiently producing magnetic fields perpendicular to the propulsion force direction, leading to reduced workability and productivity due to the curvature of magnetic lines away from the outer peripheral surface, which hinders effective interaction with the coil in linear motors and actuators.
Innovation Solution
A cylindrical bonded magnet structure comprising a columnar bonded magnet with alternately produced N and S poles and a tubular bonded magnet surrounding it, where each pole is of opposite polarity, ensuring magnetic lines extend perpendicularly to the axis, preventing curvature and enhancing magnetic field interaction, and allowing for the formation of a strong, uniform magnetic flux density profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional columnar or tubular alternately-magnetized multipolar magnets are used, then magnetic poles are formed on the outer peripheral surface with alternating N and S poles, but magnetic lines of force curve away from the outer peripheral surface along long arc lines instead of extending linearly perpendicular to the axial direction
Solution Approach 1:
The magnet is divided into two separate structures: a columnar bonded magnet and a tubular bonded magnet. This segmentation allows independent optimization of each component's magnetic pole arrangement to achieve linear magnetic field extension perpendicular to the axial direction, resolving the curvature issue of magnetic lines of force
Solution Approach 2:
The invention transitions from a single-columnar structure to a combined columnar-tubular structure, adding a dimensional aspect by surrounding the columnar magnet with a tubular magnet. This dimensional change enables magnetic lines of force to extend linearly from the columnar magnet's outer peripheral surface through the tubular magnet's inner peripheral surface, perpendicular to the axial direction
2Power
If magnetic lines of force extend radially from magnetic poles on the outer peripheral surface, then magnetic fields are produced along the outer peripheral surface, but the curved arc lines reduce the effectiveness of magnetic field interaction with the coil in the axial direction
Solution Approach 1:
Different regions of the magnet structure are assigned different magnetic pole configurations. The columnar magnet provides poles on its outer peripheral surface, while the tubular magnet provides poles on its inner peripheral surface. This local quality differentiation ensures that magnetic lines of force extend linearly through the specific region where the coil is located, maximizing propulsion force effectiveness
Solution Approach 2:
The tubular bonded magnet is positioned concentrically with the columnar bonded magnet, creating a copied structural arrangement where both magnets have alternating N and S poles. This copying approach ensures that magnetic lines of force from the columnar magnet are properly directed through the tubular magnet's opposing poles, maintaining uniform magnetic field distribution perpendicular to the axial direction
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 produces strong, uniform magnetic fields perpendicular to the propulsion force direction, increasing propulsion force and productivity by ensuring magnetic lines extend linearly, thereby improving the efficiency and stability of linear motors and actuators.
Implementation Method 1
the N and S poles are alternately arranged on the outer peripheral surface in the axial direction so that magnetic lines of force radially extend from each magnetic pole
Implementation Method 2
a columnar bonded magnet having at least one pair of N and S poles that are alternately produced in the longitudinal direction of the columnar bonded magnet
Implementation Method 3
The slider can be propelled in the axial direction of the columnar or tubular alternately-magnetized multipolar magnet by interaction between a current that flows in the coil and magnetic fields that are produced by the permanent magnet of the stator
Data Source
AI summary
The structure includes cylindrical columnar and tubular bonded magnets. The columnar magnet has at least one pair of N and S poles that are alternately produced in the longitudinal direction. The tubular magnet surrounds the columnar magnet, and has at least one pair of N and S poles that are alternately produced in the longitudinal direction. Poles of the columnar and tubular magnets that are opposed to each other in the direction perpendicular to the axis of the columnar magnet as the propulsion force direction are of opposite magnetic polarity so that magnetic fields are produced in the direction perpendicular to the propulsion force direction. The surface magnetic flux density profile balance can be smoothed by adjusting higher and lower parts of the profiles of the columnar and tubular magnets.