Annular Direct-Drive Transport With Asymmetric Linear Motor Thrust
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high costs and limited thrust density of existing flexible transportation systems driven by primary excitation type permanent magnet linear motors hinder their widespread adoption in industrial applications, particularly due to the need for extensive permanent magnets and complex control systems.
Innovation Solution
A direct-drive type annular flexible transportation system utilizing an asymmetric multi-harmonic primary excitation type permanent magnet linear motor with a long stator formed by laminated iron cores and movers that operate independently, featuring an asymmetric permanent magnet array and modular structure to enhance thrust density and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional permanent magnet linear motors are used with long stators, then the transportation system achieves direct drive capability, but the costs increase significantly due to large number of permanent magnets and complex control systems
Solution Approach 1:
The long stator is divided into multiple modular segments that can be assembled together. Each segment contains a portion of the permanent magnets and armature windings, allowing the system to achieve long travel distance without requiring a single continuous long stator. This segmentation reduces manufacturing complexity and costs while maintaining direct drive capability.
Solution Approach 2:
Instead of using a traditional long stator with moving magnetic poles, the patent inverts the configuration by using a long stator formed by laminated iron cores with permanent magnets arranged in an asymmetric pattern. The movers become the moving elements with armature windings, reversing the conventional roles and reducing the number of permanent magnets required.
2Use of energy by moving object
If primary excitation type permanent magnet linear motors are used, then the system achieves linear motion conversion, but the thrust density is limited due to symmetric excitation structure
Solution Approach 1:
The patent employs an asymmetric permanent magnet array arrangement where permanent magnets are positioned non-uniformly along the stator segments. This asymmetric configuration creates an asymmetric magnetic field distribution that generates higher thrust density compared to symmetric arrangements. The asymmetric pattern allows for optimized magnetic flux distribution and improved force generation while maintaining efficient linear motion conversion.
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 achieves significant cost reduction and improved thrust density by using a simple, low-cost stator structure and independent movers, enabling flexible and efficient transportation with enhanced harmonic magnetomotive force generation.
Implementation Method 1
the asymmetric permanent magnet array and armature windings cooperate to generate an asymmetric air-gap magnetic field
Implementation Method 2
the armature magnetic field and the permanent magnet excitation magnetic field together constitute an air-gap magnetic field. When the motor starts, the magnetic pole is dragged, and the armature traveling wave magnetic field and the permanent magnet excitation magnetic field are relatively static. Therefore, the current in the armature winding generates electromagnetic thrust under the action of the air gap magnetic field.
Implementation Method 3
the current in the armature winding generates electromagnetic thrust under the action of the air gap magnetic field
Implementation Method 4
a long stator and a plurality of movers, wherein the long stator is formed by seamless connection of stator iron cores presenting a multi-segment cogging structure
Data Source
AI summary
A direct-drive type annular flexible transportation system and a collaborative control method thereof are provided. The direct-drive type annular flexible transportation system includes an annular base, a primary excitation type linear motor, an power supplying module, a power driving module, a position detection module, and a wireless communication module. The primary excitation type linear motor includes a long stator and a plurality of movers. The long stator is formed by connection of stator iron cores presenting a multi-segment cogging structure and is installed on the annular base. Each of the movers includes a short primary, a power driving module, a position detection module, and a wireless communication module. The short primary is formed by an asymmetrically-structured permanent magnet array, an armature winding, and a primary iron core.