Annular Wireless Power Transfer for CT Rotating Gantries
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Solution Overview
Problem
The power transmission in traditional CT devices through friction between the electric brush and slip ring increases maintenance costs and reduces reliability, and the weight and size of the rotating gantry due to the HVG and high power requirements, limiting scanning speed and power distribution capacity.
Innovation Solution
A wireless power transmission apparatus using annular structures with magnetic core assemblies and windings for transmitting power between a stationary and rotating side, reducing the weight and improving safety by eliminating rotating parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is transmitted through friction between electric brush and slip ring, then power can be supplied to rotating components, but maintenance cost increases and reliability decreases
Solution Approach 1:
The patent replaces the mechanical contact-based power transmission system (electric brush and slip ring) with a wireless power transmission system using electromagnetic coupling. The stationary side includes a primary winding and magnetic core assembly, while the rotating side includes a secondary winding and magnetic core assembly, enabling contactless power transfer through electromagnetic induction, thereby eliminating friction and wear issues
Solution Approach 2:
The patent introduces magnetic core assemblies on both stationary and rotating sides as intermediary elements to enhance electromagnetic coupling efficiency. These magnetic cores act as mediators to concentrate and guide magnetic flux between the primary and secondary windings, improving power transmission efficiency without requiring direct mechanical contact
2Power
If HVG and detector are fixed on rotating gantry, then power transmission is achieved, but gantry diameter and volume increase
Solution Approach 1:
By replacing the traditional mechanical power transmission system with wireless electromagnetic power transmission, the patent eliminates the need for large slip rings and extensive cabling on the rotating gantry. This allows for a more compact arrangement of power transmission components, reducing the overall volume of the rotating gantry
Solution Approach 2:
The patent divides the power transmission system into two separate magnetic core assemblies - one on the stationary side and one on the rotating side. This segmentation allows the rotating side to carry only the essential secondary winding and magnetic core, significantly reducing the weight and volume on the rotating gantry compared to housing the entire HVG system
3Stability of the object's composition
If counterweight is added to rotating gantry for balance, then dynamic balance is achieved, but load on gantry increases
Solution Approach 1:
The wireless power transmission system reduces the mechanical load on the rotating gantry by eliminating heavy slip rings and extensive power cables. The reduced weight allows for smaller counterweights or alternative balancing solutions, decreasing the overall load on the gantry while maintaining dynamic balance
4Productivity
If high instantaneous power is required for scanning, then scanning capability is improved, but power distribution capacity requirement increases
Solution Approach 1:
The magnetic core assemblies act as electromagnetic intermediaries that enable efficient power transfer from the stationary primary winding to the rotating secondary winding. This electromagnetic coupling system can handle high instantaneous power requirements for CT scanning by optimizing magnetic flux density and coupling efficiency, reducing the overall power distribution capacity requirements compared to traditional friction-based systems
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
Reduces the weight of the rotating gantry, enhances scanning speed, and lowers maintenance costs by eliminating contact-based power transmission, thus improving the time resolution of CT scanning.
Implementation Method 1
the first winding is used for receiving an alternating voltage and transmitting the alternating voltage to the second winding
Implementation Method 2
a first magnetic core assembly arranged on a circumference of the first annular structure, the first magnetic core assembly comprises at least one magnetic core
Data Source
AI summary
The present disclosure discloses a wireless power transmission apparatus and an imaging device comprising the same. The wireless power transmission apparatus comprises: a first annular structure, provided with a first magnetic core assembly and a first framework, wherein the first magnetic core assembly is provided on a circumference of the first annular structure, the first framework is wound with a first winding, and the first winding passes through a window of the magnetic core in the first magnetic core assembly; and a second annular structure, provided with a second framework, wherein the second framework is wound with a second winding, and the second winding passes through the window of the magnetic core in the first magnetic core assembly; and the first winding is used for receiving an alternating voltage and transmitting the alternating voltage to the second winding.