Self-Powered Magnetic Bearing Control for Vacuum Pumps
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Solution Overview
Problem
Existing magnetic bearings for vacuum pumps are expensive and require active control, making them costly and complex to implement.
Innovation Solution
A self-sufficient active magnetic bearing system that generates its own supply voltage using a generator unit, eliminating the need for external power sources, comprising a stator, electromagnet, and control unit, with a generator unit that induces voltage from rotating permanent magnets and stabilizes it for use in the magnetic bearing and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If permanent magnet bearings are used, then active control is not required, but the cost is high
Solution Approach 1:
The magnetic bearing system generates its own power through the generator unit that converts rotational energy into electrical energy, eliminating the need for external power connections and making the system self-sufficient
Solution Approach 2:
The patent combines the magnetic bearing system with a generator unit and power management circuitry into an integrated assembly, where the generator stator and bearing stator can be merged into a single structure, reducing component count and manufacturing cost
2Adaptability or versatility
If active magnetic bearing control is implemented, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The control unit, generator, and power management components are integrated into a compact arrangement where the generator stator and bearing stator are merged, and the control unit is positioned within the stator structure, reducing overall system complexity
Solution Approach 2:
The stator structure serves multiple functions: it acts as both the magnetic bearing stator and the generator stator, while also providing mechanical support for the control unit and power management circuitry, thereby reducing the number of separate components needed
3Reliability
If external power connections are provided for magnetic bearing, then power supply reliability is improved, but ease of installation deteriorates
Solution Approach 1:
The magnetic bearing system generates its own power through the generator unit that converts rotational energy into electrical energy, eliminating the need for external power connections and simplifying installation
Solution Approach 2:
The patent extracts the power generation function from external power sources and integrates it directly into the bearing system through the generator unit, making the system autonomous and eliminating complex external wiring requirements
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
Enables a cost-effective and technically simple implementation of magnetic bearings in vacuum pumps, allowing autonomous operation without external power connections and reducing the need for rare earth materials.
Implementation Method 1
a generator unit comprising a generator stator and a generator rotor, configured for generating a voltage based on a movement of the rotor with respect to the stator
Implementation Method 2
an electromagnet; a rotor mounted in the stator by means of at least the electromagnet; a control unit configured for controlling a relative position of the rotor with respect to the stator by means of the electromagnet
Data Source
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AI summary
The invention relates to a magnetic bearing, in particular for a vacuum pump, comprising: a stator; an electromagnet; a rotor mounted in the stator by means of at least the electromagnet; a control unit arranged for controlling a relative position of the rotor with respect to the stator by means of the electromagnet; and a generator unit arranged for generating a voltage based on a movement of the rotor with respect to the stator and for providing the generated voltage as a supply voltage for the control unit.