Wireless Power Transfer in Electromagnetic Propulsion
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Solution Overview
Problem
Electromagnetic propulsion systems face challenges in providing on-board power to moving structures without tethers, particularly in self-propelled elevator systems where traditional power transfer methods like moving cables or current collectors are cumbersome and inefficient.
Innovation Solution
An electromagnetic propulsion system utilizing primary windings, a permanent magnet, and a secondary winding to create a magnetic field with base and high frequency harmonic components, where the base component contributes to motion and the harmonic components generate an electro-motive force for power transfer to the elevator car, enabling wireless power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional power transfer methods (moving cables or current collectors) are used to provide power to the moving elevator car, then power can be delivered to the car, but the system becomes mechanically complex and less reliable
Solution Approach 1:
The patent replaces mechanical power transfer systems (moving cables, current collectors) with an electromagnetic wireless power transfer system. Primary windings on the stationary structure create a magnetic field that induces current in secondary windings on the moving car, eliminating mechanical contacts and improving reliability while reducing system complexity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary to transfer power between the stationary structure and the moving car. The magnetic field acts as a mediator that couples the primary windings on the structure with the secondary windings on the car, enabling wireless energy transfer without direct mechanical or electrical contact.
2Productivity
If the magnetic field is used for both propulsion and power transfer, then system efficiency improves, but the magnetic field design becomes more complex
Solution Approach 1:
The patent makes the magnetic field multi-functional by using it for both propulsion and wireless power transfer. The primary windings generate a magnetic field that serves dual purposes: creating electromagnetic force for car propulsion and inducing current in secondary windings for power transfer, thereby improving overall system efficiency.
Solution Approach 2:
The patent merges the propulsion function and power transfer function into a single integrated electromagnetic system. Instead of having separate systems for propulsion and power delivery, the invention combines both functions into the magnetic field generated by the primary windings, reducing the number of components and improving efficiency.
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 allows for efficient and reliable wireless power transfer to elevator car subsystems, reducing the need for physical connections and enhancing the reliability and safety of ropeless elevator systems by leveraging the magnetic field's harmonic components for both propulsion and power delivery.
Implementation Method 1
an excitation energy applied to the plurality of primary windings for creating a magnetic field including a base component and low frequency harmonic components, and wherein the base component substantially contributes toward motion between the plurality of primary windings and the permanent magnet
Implementation Method 2
the low frequency harmonic components contributes toward generating an electro-motive force in the secondary winding based on displacement between the plurality of primary windings and the permanent magnet
Implementation Method 3
the magnetic field includes a high frequency component that contributes toward generating the electro-motive force in the secondary winding and based on variation with respect to time
Data Source
AI summary
An electromagnetic propulsion system includes a plurality of primary windings and a permanent magnet arranged to move with respect to the plurality of primary windings. A secondary winding of the system is disposed in a non-moving relationship with the permanent magnet. An excitation energy is applied to the plurality of primary windings for creating a magnetic field that includes a base component and low frequency harmonic components. The base component substantially contributes toward motion between the plurality of primary windings and the permanent magnet and the low frequency harmonic components substantially contributes toward generating an electro-motive force in the secondary winding based on displacement between the plurality of primary windings and the permanent magnet.