Linear Induction Motor Railway Track Using Non-Magnetic Plates
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Solution Overview
Problem
Conventional trams with metal wheels face difficulties on sloping sections due to adhesion issues and require increased energy for propulsion, while existing solutions like permanent magnets are expensive and unsuitable for urban use.
Innovation Solution
A railway track system incorporating a linear induction motor with non-magnetic, electrically conductive plates and an asynchronous linear motor, where the plates are temporarily magnetized by an external magnetic field to generate a driving force without permanent magnetization, ensuring safe operation in urban areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional metal wheels are used on metal rails, then adhesion is reliable, but traction on sloping sections is insufficient
Solution Approach 1:
The patent replaces the conventional mechanical adhesion-based wheel-rail traction system with an electromagnetic linear induction motor system. The motor generates direct longitudinal force through electromagnetic interaction between the plates on the track and the moving part on the vehicle, eliminating dependence on wheel-rail adhesion and enabling effective traction on steep slopes.
2Force
If permanent magnets are installed along the railway line, then improved traction is achieved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive permanent magnets with inexpensive non-magnetic conductive plates that can be easily manufactured and installed. The plates serve their purpose temporarily during vehicle passage and can be replaced affordably if needed, dramatically reducing the overall system cost while maintaining effective linear motor functionality.
Solution Approach 2:
The patent changes the magnetic property parameter of the track material from permanent magnetization to non-magnetic conductivity. This parameter change allows the use of cheap conductive materials like aluminum or copper plates instead of expensive permanent magnets, while the moving part's magnetic field provides the necessary magnetic interaction for force generation.
3Ease of manufacture
If non-magnetic plates are used, then cost is reduced and safety for pedestrians is improved, but magnetic field interaction must be maintained through alternative means
Solution Approach 1:
The patent inverts the conventional linear motor configuration by placing the non-magnetic conductive plates on the stationary track and the magnetic field-generating components on the moving vehicle. This inversion allows the use of cheap non-magnetic materials on the track while maintaining electromagnetic interaction through the moving part's magnetic field.
Solution Approach 2:
The patent uses the non-magnetic conductive plates as an intermediary that conducts induced currents when exposed to the moving part's magnetic field. These induced currents create the necessary electromagnetic interaction for force generation, mediating between the non-magnetic track material and the magnetic field from the vehicle.
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 solution provides improved traction for trams on sloping sections without disturbing pedestrians or electronic equipment, using a combination of rotational drive and linear induction motor to manage gradients effectively, ensuring efficient and safe operation in urban environments.
Implementation Method 1
the plates are temporarily magnetized by an external magnetic field to generate a driving force
Implementation Method 2
non-magnetic, electrically conductive plates and an asynchronous linear motor, where the plates are temporarily magnetized
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The invention relates to a railway for a rail vehicle, including two parallel lines of rails (4) extending along a longitudinal median line (L) while being transversely spaced apart. Said railway further includes, on at least one longitudinal section, a line of plates (6) extending along the longitudinal median line (L) and forming a stationary portion of a linear induction motor. Each plate (6) is electrically conductive and either magnetic with nonpermanent magnetization, or nonmagnetic. Each plate (6) is electrically insulated.