Magnetic Levitation Bearing Bias Current Control During Power-Off Feedback
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Solution Overview
Problem
The magnetic levitation bearing system experiences excessive power consumption during energy feedback when power is turned off, leading to increased motor feedback current, which can exceed protection limits, causing energy feedback failure and damaging the system.
Innovation Solution
A power consumption control device with a voltage detection circuit and comparison unit that adjusts the bearing bias current based on motor feedback current and rotation speed signals to maintain power consumption within a set range, using differential control to reduce power consumption and prevent feedback current overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the magnetic levitation bearing system maintains high power consumption during energy feedback, then the feedback current increases, but this causes the feedback current to exceed protection limits and fail the energy feedback function
Solution Approach 1:
The patent applies dynamics by making the bearing bias current adjustable and variable during the energy feedback process. The controller dynamically modifies the bias current based on real-time feedback current measurements, transitioning from a static current regime to a dynamic one that adapts to changing system conditions, thereby preventing current overload while maintaining feedback functionality.
Solution Approach 2:
The patent implements parameter changes by modifying the bearing bias current parameter during energy feedback. When the feedback current exceeds a predetermined threshold, the controller reduces the bias current parameter, which directly controls the power consumption of the magnetic levitation bearing, thus bringing the feedback current back within safe limits.
2Use of energy by moving object
If the bearing bias current is reduced to lower power consumption, then the feedback current decreases, but this may affect the levitation performance of the magnetic levitation bearing
Solution Approach 1:
The patent applies preliminary action by detecting the feedback current status before it reaches dangerous levels and proactively adjusting the bias current to prevent excessive current conditions. This anticipatory control ensures that levitation performance is maintained throughout the feedback process by keeping the current within optimal ranges rather than reacting after problems occur.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the feedback current and using this information to adjust the bearing bias current. The controller creates a closed-loop system where the output (feedback current) is fed back to influence the input (bias current), enabling automatic optimization of both power consumption and levitation performance based on real-time system state.
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 effectively reduces power consumption and feedback current, enhancing the reliability and service life of the magnetic levitation system by preventing excessive current and ensuring safe shutdown.
Implementation Method 1
a voltage detection circuit, configured to detect whether an input power supply of a magnetic levitation system to be controlled is turned off
Implementation Method 2
The electricity generated by the motor is fed back to the DC bus through the motor controller to convert the kinetic energy into electrical energy
Implementation Method 3
Magnetic levitation bearings use the electromagnetic force to suspend the rotor in the air so that there is no mechanical contact between the rotor and the stator
Implementation Method 4
a bearing controller of the magnetic levitation system adjusts a magnitude of a bearing bias current of the magnetic levitation system according to the comparison result, to control a power consumption of a magnetic levitation bearing
Data Source
AI summary
A power consumption control device includes: a voltage detection circuit configured to detect whether an input power supply of a magnetic levitation system to be controlled is turned off; and a comparison unit configured to detect an operating parameter of a motor of the magnetic levitation system during an operation of the motor as a generator, and compare the operating parameter with a set parameter to obtain a comparison result; a motor controller of the magnetic levitation system controls the motor of the magnetic levitation system to operate as the generator in a case that the input power supply is turned off, a bearing controller of the magnetic levitation system adjusts a magnitude of a bearing bias current of the magnetic levitation system according to the comparison result, to control a power consumption of a magnetic levitation bearing of the magnetic levitation system within a set range.