Linear Motor Mover Roller Layout for Low-Friction Curved Conveyance
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Solution Overview
Problem
Conventional linear motor systems experience high sliding frictional resistance between the moving body and the conveying path, which hinders efficient movement, especially in curved portions.
Innovation Solution
A linear motor system with a mover featuring permanent magnets and a stator with an iron core and windings, incorporating a main roller and sub-roller configuration to support magnetic attraction forces and reduce friction, allowing the mover to move along the stator with reduced sliding frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple rows of rollers and side rollers are used to support the moving body, then the moving body can be prevented from detaching during curved movement, but sliding frictional resistance increases
Solution Approach 1:
The patent replaces the conventional mechanical roller support system with a magnetic field-based support system. The linear synchronous motor generates magnetic attraction force between the stator and mover to support the moving body, eliminating the need for multiple rows of rollers and side rollers. This substitution reduces sliding frictional resistance while maintaining the ability to prevent detachment during curved movement through magnetic force control.
Solution Approach 2:
The patent changes the support mechanism from mechanical contact (rollers) to magnetic field interaction. By adjusting magnetic field parameters (strength, distribution) in the linear synchronous motor, the system can provide adequate support force to prevent detachment during curved movement without the frictional resistance inherent in mechanical roller systems.
2Device complexity
If conventional belt conveyor with rotary motor is used, then structure is simple, but production efficiency is lower
Solution Approach 1:
The patent replaces the rotary motor-driven belt conveyor system with a linear synchronous motor system. This substitution enables independent conveyance of multiple objects simultaneously along linear and curved paths, significantly improving production efficiency. Although the linear motor system adds complexity in motor structure, the overall conveyor system becomes more efficient and versatile.
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 system effectively reduces sliding frictional resistance, enabling smoother movement and improved design margins for conveyance objects, even in curved paths, by utilizing a three-row roller configuration and a sub-roller to counteract centrifugal forces.
Implementation Method 1
a first main roller engaged with a first traveling surface disposed on the stator; a placing table on which a conveyance object is placed; and a sub-roller engaged with a second traveling surface disposed on an upper surface of the stator. The first main roller supports a magnetic attraction force generated between the stator and the mover
Implementation Method 2
when the moving body moves, the two rows of rollers and the two rows of side rollers receive the sliding frictional resistance force generated between the rollers and the conveying path. Thus, a technique for reducing the sliding frictional resistance force generated between the rollers and the conveying path has been demanded.
Data Source
AI summary
A linear motor system includes: a mover including permanent magnets arranged in a traveling direction in a plane parallel to a plane formed by the traveling direction and a vertical direction; and a stator including an armature including an iron core in which projections around which windings are wound are arranged in the traveling direction, the armature being disposed to face the permanent magnets of the mover. The mover includes a mover body including a first main roller engaged with a first traveling surface disposed on the stator, a placing table on which a conveyance object is placed, and a sub-roller engaged with a second traveling surface disposed on an upper surface of the stator. The first main roller supports a magnetic attraction force generated between the stator and the mover, and the sub-roller supports a force in a direction opposite the magnetic attraction force acting on the mover.