Magnetic Bearing Pump With Axial Rotor Position Feedback
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Solution Overview
Problem
Bearingless pumps face challenges in maintaining precise axial and radial positioning of the rotor, leading to potential wear and damage due to excessive movement, especially in applications involving aggressive or pure fluids.
Innovation Solution
The pump employs magnetic bearings using complementary permanent magnets and an electromagnetic system to maintain axial positioning, with an electronic controller adjusting the magnetic forces to stabilize the rotor's position, and a position sensor to monitor and correct deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic bearings are used to journal the rotor, then mechanical wear and contamination are eliminated, but axial positioning precision deteriorates leading to excessive rotor movement
Solution Approach 1:
The patent replaces mechanical axial positioning systems with an electromagnetic system. Electromagnets mounted on the stator create magnetic forces that precisely control the axial position of the rotor, eliminating the need for mechanical contact while maintaining positioning precision. This substitution resolves the contradiction by providing both wear-free operation and precise axial control.
Solution Approach 2:
The patent implements a feedback control system using position sensors to detect the rotor's axial position and an electronic controller that adjusts the electromagnetic forces in real-time. The sensor signals are fed back to the controller, which modulates the electromagnet currents to maintain the rotor at the desired axial position. This closed-loop feedback mechanism ensures precise axial positioning while eliminating mechanical wear.
2Manufacturing precision
If conventional mechanical bearings are used, then axial positioning is maintained, but the pump cannot handle aggressive or pure fluids without contamination
Solution Approach 1:
The patent eliminates mechanical bearings that would contaminate pure or aggressive fluids by substituting them with a magnetic bearing system. The rotor is journaled magnetically without mechanical contact, preventing contamination of the fluid being pumped. This substitution maintains axial positioning capability while eliminating the harmful effect of fluid contamination.
3Manufacturing precision
If electromagnetic positioning system is added, then axial positioning precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the axial positioning function with the existing electromagnetic drive system. The same electromagnets used for driving the rotor are also utilized for axial positioning, and the position feedback system is integrated with the drive control. This merging reduces overall system complexity by combining multiple functions into a unified electromagnetic control architecture rather than adding separate mechanical and electromagnetic 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
This solution reduces frictional losses and wear, ensuring precise rotor positioning and extended component lifespan, suitable for conveying pure or aggressive fluids without mechanical contamination.
Implementation Method 1
The one or more complementary permanent magnets of the rotor and the one or more permanent magnets of the stator are configured to create one or more magnetic bearings
Implementation Method 2
The pull magnet is configured to interact with the at least one axial positioning magnet to position the rotor in an axial direction relative to the stator
Implementation Method 3
The armature and the magnet drive are configured to rotate the rotor with respect to the stator
Data Source
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AI summary
A pump (100) includes a stator (220), a rotor (230) , and an impeller (250). The stator may include one or more electromagnets and one or more permanent magnets (222). The rotor includes an armature (234), one or more complementary permanent magnets (232), and a pull magnet (228) configured to position the rotor in an axial direction. The rotor is disposed within the stator. The complementary permanent magnets (232) and the one or more permanent magnets (222) of the stator create magnetic bearings. The armature (234) is aligned with at least one of the electromagnets of the stator and configured to rotate the rotor with respect to the stator. The impeller (250) is coupled to the rotor.