Permanent Magnet Synchronous Motor for X-ray Tube Rotary Anode
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Solution Overview
Problem
Conventional X-ray tube rotary anode drives using asynchronous motors suffer from low torque due to a large air gap, high eddy current losses, and inefficient power factor, which complicates heat dissipation and reduces motor efficiency, especially at high temperatures.
Innovation Solution
A synchronous motor drive is implemented for the rotary anode, utilizing a stator with permanent magnets and coils, and a rotor with a soft-magnetic structure, eliminating the need for current to generate a magnetic flux and allowing a larger air gap for vacuum insulation, while using a toothed rotor structure to enhance torque generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a synchronous motor drive with permanent magnets is used, then motor efficiency and power factor are improved, but device complexity increases due to additional permanent magnets and coil arrangements
Solution Approach 1:
The patent combines the permanent magnets and coils into a unified stator structure where permanent magnets are arranged in alternating polarity patterns and coils are positioned to interact with these magnets. This merging of magnetic sources and windings creates a compact synchronous motor design that achieves high efficiency while managing complexity through integrated construction.
Solution Approach 2:
The patent applies local quality by creating regions of different magnetic properties within the stator - permanent magnets provide strong localized magnetic fields in specific zones, while coils provide controllable magnetic fields in adjacent zones. This spatial differentiation of magnetic sources allows efficient torque generation while organizing complexity into functional regions.
2Power
If permanent magnets are arranged in the stator with coils, then electromagnetic utilization is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the stator structure into modular units with repeating patterns of permanent magnets and coils. This segmentation allows the complex electromagnetic structure to be manufactured in standardized modules that can be assembled systematically, reducing overall manufacturing complexity while maintaining high electromagnetic utilization.
Solution Approach 2:
The patent ensures continuous magnetic flux paths through careful arrangement of permanent magnets with alternating polarities and positioning of coils to maintain continuous electromagnetic interaction. This continuity maximizes electromagnetic utilization while the repetitive modular pattern simplifies manufacturing processes.
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 configuration minimizes losses, achieves high efficiency with a power factor close to 1, reduces current and heat generation, and allows for a more compact design by leveraging the high electromagnetic utilization of permanent magnet synchronous motors.
Implementation Method 1
The coils and the permanent magnets are arranged along the circumference of the stator housing, wherein in each case one permanent magnet is arranged within in each case one coil
Implementation Method 2
a stator that exerts a torque on the rotor by magnetic force
Implementation Method 3
a plurality of permanent magnets arranged in the stator for generating a second magnetic field
Data Source
AI summary
The embodiments relate to a rotary anode arrangement with a rotary anode, a rotor for driving the rotary anode and a stator, which exerts a torque on the rotor. The stator includes at least one coil for generating a first magnetic field and at least one permanent magnet for generating a second magnetic field. The embodiments also relate to an X-ray tube with the rotary anode arrangement. The embodiments offer the advantage that a high electromagnetic utilization is possible with a synchronous motor that is excited by permanent magnets.