Linear Motor Back Yoke Assembly for Compact Magnetic Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional linear motors are complex to manufacture and have a large volume and weight due to the need for multiple magnetic pipes forming back yokes and additional support structures like block frames and covers.
Innovation Solution
A back yoke assembly that surrounds multiple linear motor units, eliminating the need for individual magnetic pipes and support structures, allowing for easier mounting and reducing the overall size and weight by using a single, integrated magnetic circuit formed by partitioned assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the back yoke is formed of a plurality of pipes mounted on each linear motor unit, then the magnetic circuit is formed, but the manufacturing process becomes complicated and the volume and weight increase
Solution Approach 1:
The patent merges multiple individual back yoke pipes into a single integrated back yoke structure that spans across multiple linear motor units. This single back yoke is formed as one piece and mounted collectively on all linear motor units, eliminating the need for separate pipes on each unit and simplifying the manufacturing process while maintaining the magnetic circuit function
Solution Approach 2:
The single back yoke structure serves multiple functions simultaneously: it forms the magnetic circuit for all linear motor units, provides structural support for the entire assembly, and eliminates the need for separate support structures. This multi-functional design reduces both complexity and the number of components required
2Reliability
If individual back yoke pipes and support structures are used for each linear motor unit, then the magnetic circuit is formed, but the volume and weight of the overall motor increase
Solution Approach 1:
The patent combines multiple individual back yoke pipes into a single integrated back yoke structure that serves all linear motor units. This consolidation reduces the total amount of magnetic material required and eliminates redundant components, thereby reducing the overall weight of the stationary part while maintaining adequate magnetic circuit formation across all units
3Reliability
If multiple individual back yoke pipes are used, then the magnetic circuit is formed, but the volume of the motor increases
Solution Approach 1:
The patent merges multiple individual back yoke pipes into a single integrated back yoke structure that spans across multiple linear motor units. This single structure occupies less space than multiple separate pipes would require, reducing the overall volume of the stationary part while maintaining the necessary magnetic circuit paths for all units
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
Simplifies the mounting process and reduces the volume and weight of the linear motor by integrating the back yoke assembly, which forms a common magnetic circuit between units, thus downsizing the motor without requiring additional support members.
Implementation Method 1
The mover includes a direct drive shaft capable of reciprocating in an axial direction of the shaft and a permanent magnet array mounted to the direct drive shaft. The stator has a plurality of excitation windings each formed of a winding conductor wound in a coil such that the mover reciprocates in an inner space defined inside the excitation windings.
Implementation Method 2
The linear motor units each include a mover and a stator. The mover includes a direct drive shaft capable of reciprocating in an axial direction or a direction an axial line of the shaft and a permanent magnet array formed of a plurality of permanent magnets mounted to the direct drive shaft.
Implementation Method 3
The back yoke is constituted from a back yoke assembly made of magnetic material and including a surrounding portion that entirely surrounds the linear motor units.
Data Source
AI summary
Provided herein is a linear motor in which a back yoke can readily be mounted onto a plurality of linear motor units. The back yoke is constituted from a back yoke assembly including a surrounding portion that entirely surrounds six linear motor units. The back yoke works to form part of respective magnetic circuits of the six linear motor units. The back yoke assembly includes first and second divided assemblies and five partition wall portions. The first and second divided assemblies are each formed by press working a magnetic plate made of silicon steel.