Linear Motor Segmented Armature Reduces Magnetic Pull Wear
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Solution Overview
Problem
Conventional linear motors experience reduced system accuracy and significant wear due to strong magnetic pull between the salient pole of the armature core and the permanent magnet, leading to inefficiencies and component degradation.
Innovation Solution
A linear motor design featuring armature modules with multiple salient poles and corresponding permanent magnet modules, where currents with a predetermined phase difference are applied to generate a traveling magnetic field, maintaining a predetermined gap between the components to prevent magnetic pull and enhance thrust generation, while allowing for modular assembly and modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional linear motor structure with strong magnetic pull between salient pole and permanent magnet is used, then thrust generation is effective, but system accuracy decreases and wear and tear on supporting tool becomes serious
Solution Approach 1:
The motor is divided into modular units with multiple salient poles (at least four) arranged around a ring-shaped magnetic body. Each salient pole has coils winding round it, creating segmented magnetic fields that reduce concentrated magnetic pull while maintaining effective thrust generation through distributed electromagnetic forces.
Solution Approach 2:
The patent applies different polarities to adjacent salient poles and permanent magnets, creating alternating magnetic fields. This local variation in magnetic polarity distributes the magnetic interaction across multiple points, reducing the concentrated magnetic pull that causes wear while maintaining overall thrust effectiveness.
2Productivity
If the gap between salient pole and permanent magnet is reduced to improve magnetic coupling, then thrust efficiency increases, but magnetic pull increases causing more wear
Solution Approach 1:
Instead of a single large magnetic interaction zone, the motor uses multiple segmented salient poles and permanent magnets distributed around the circumference. This segmentation allows for a wider effective gap area while maintaining thrust efficiency through distributed magnetic coupling across multiple poles.
Solution Approach 2:
The patent transitions from a concentrated magnetic interaction (single point or small area) to a distributed three-dimensional arrangement of multiple salient poles and permanent magnets around a ring-shaped magnetic body. This spatial distribution widens the effective area of the gap while maintaining magnetic coupling efficiency.
3Ease of manufacture
If a plate type linear motor structure is used, then manufacturing is simplified, but strong magnetic pull causes guide wear
Solution Approach 1:
The plate type linear motor incorporates segmented armature modules with multiple salient poles instead of a conventional continuous structure. This segmentation maintains manufacturing simplicity while distributing magnetic forces to reduce guide wear.
Solution Approach 2:
The patent changes the magnetic field distribution parameters by introducing multiple salient poles with alternating polarities, transforming the concentrated magnetic pull into distributed magnetic forces. This parameter change reduces the harmful magnetic pull effect on guides while maintaining the simplified plate type structure.
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 design prevents guide wear, achieves high thrust and conveying speed with a small motor size, and facilitates easy assembly and modification, improving efficiency and extending component lifespan.
Implementation Method 1
currents having a predetermined phase difference are applied to the armature modules such that a thrust according to a traveling magnetic field is generated
Implementation Method 2
a fixed magnet is arranged at one of a mover and a stator and alternating multi-phase power is applied to the other to generate an electromagnetic force between the motor and the stator
Data Source
AI summary
A linear motor comprises a first member including armature modules, a second member including permanent magnet modules, and a supporting mechanism. Each armature module has at least four salient poles projected from a magnetic body to the second member and coils winding round the salient poles, through which a single-phase current flows. Each permanent magnet module has as many permanent magnets as the number of the salient poles included in each armature module. Currents having a predetermined phase difference are applied to the armature modules such that a thrust according to a traveling magnetic field is generated in a unit composed of S armature modules and P (P is a multiple of 2) permanent magnet modules arranged in a moving direction. A stator corresponding to one of the first and second members is fixed to the supporting mechanism such that a mover corresponding to the other moves by the thrust.