Vacuum Pump Magnetic Bearing Layout for Stable Rotor Support
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Solution Overview
Problem
Vacuum pumps with magnetic bearings face challenges in attenuating rotor swinging and vibration at resonance points due to offsetting restoring forces, requiring precise rotor balance and lengthy fine adjustments.
Innovation Solution
A vacuum pump configuration with radial magnetic force generation means arranged on both sides of the rotor's center of gravity in the exhaust direction, ensuring that restoring and inclination forces act in the same direction to control swinging and vibration efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active radial bearing applies a restoring force to the upper portion of the rotor, then the rotor is pulled back to the equilibrium point, but the lower restoring force is offset by an inclination force causing swinging and vibration at resonance points
Solution Approach 1:
The patent applies asymmetry by positioning both radial magnetic force generation means on the outlet side of the center of gravity rather than symmetrically on opposite sides. This asymmetric arrangement ensures that the restoring force and inclination force act in the same direction, preventing force cancellation and effectively suppressing rotor swinging and vibration at resonance points.
Solution Approach 2:
The patent changes the spatial dimension of force application by positioning the magnetic force generation means radially outward from the center of gravity on the outlet side. This dimensional arrangement allows the restoring force and inclination force to align in the same direction, transforming the force interaction from opposing vectors to cooperative vectors that jointly suppress vibration.
2Reliability
If the restoring force acting on the lower portion of the rotor is reduced, then the rotor balance can be improved, but high precision rotor production is required bringing about lengthy fine adjustment time
Solution Approach 1:
By positioning both radial magnetic force generation means on the outlet side of the center of gravity, the patent creates an asymmetric force distribution that naturally aligns restoring and inclination forces. This configuration improves rotor balance while allowing for looser part accuracy specifications, thereby reducing assembly adjustment time.
Solution Approach 2:
The patent changes the positional parameter of the radial magnetic force generation means from symmetric distribution to concentrated positioning on the outlet side. This parameter change modifies the force interaction characteristics, enabling effective vibration suppression with reduced precision requirements and shorter adjustment times.
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 effectively reduces rotor swinging and vibration, allowing for looser part accuracy and shorter assembly adjustment times by aligning restoring forces without attenuation.
Implementation Method 1
radial magnetic force generation means for supporting a rotor for exhausting gas in a radial direction in a non-contact manner by using a magnetic force
Data Source
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AI summary
Provided are a vacuum pump, a magnetic bearing device, and a rotor that suppress swinging and vibration of a rotor. A vacuum pump includes, in the following order in the exhaust direction of a gas, the center of gravity of a rotor, an active radial bearing that supports the rotor in the radial direction in a non-contact manner by using a magnetic force, and a passive radial bearing that supports the rotor in the radial direction in a non-contact manner using a magnetic force.