Magnetic Bearing Temperature Control via Dynamic Gap Adjustment
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Solution Overview
Problem
Magnetic bearings face challenges in maintaining uniform temperature distributions under varying operating conditions, particularly in large bearings where uneven loading leads to different temperature fluctuations due to electrical power losses in windings.
Innovation Solution
The solution involves controlling the currents through the windings of magnet arrangements to maintain equal temperatures by allowing slight variations in bearing gaps, using a control strategy where the difference in gap sizes is adjusted based on temperature differences, ensuring that both magnet arrangements operate at the same temperature regardless of load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bearing gaps on opposite sides are kept the same size during operation, then the running accuracy and image quality are improved, but the temperature distribution in the magnet arrangements becomes non-uniform under uneven loading conditions
Solution Approach 1:
The invention changes the control parameter from maintaining equal gap sizes to maintaining equal temperatures in opposing magnet arrangements. The control system adjusts the bearing gaps dynamically based on temperature measurements, allowing gap sizes to vary while keeping temperatures uniform. This parameter transformation resolves the contradiction by prioritizing temperature uniformity over gap equality.
Solution Approach 2:
The invention introduces temperature feedback control by measuring the temperatures in magnet arrangements and using these measurements to adjust the bearing gaps. Temperature sensors provide continuous feedback to the control system, which then modifies the gap sizes to compensate for temperature differences caused by uneven loading, ensuring uniform temperature distribution throughout operation.
2Measurement precision
If the bearing gaps are adjusted to maintain equal sizes on opposite sides under uneven loading, then the running accuracy is maintained, but the power consumption and temperature fluctuations in the windings increase
Solution Approach 1:
The invention transforms the control objective from gap size equality to temperature equality. By controlling the bearing gaps to maintain uniform temperatures rather than uniform sizes, the system reduces unnecessary power consumption in the windings while still maintaining sufficient running accuracy through the thermal time constant of the system.
Solution Approach 2:
The invention converts the typically harmful effect of temperature variation into a useful indicator for control. By monitoring temperature differences and using them to adjust bearing gaps, the system turns thermal effects into a beneficial feedback mechanism that reduces overall power consumption while maintaining acceptable running accuracy.
3Temperature
If the bearing gaps are allowed to vary to equalize temperatures, then the temperature distribution uniformity is improved, but the bearing gap size consistency changes
Solution Approach 1:
The invention deliberately changes the controlled parameter from gap size to temperature. By making temperature the primary control objective rather than gap size, the system accepts variable gap sizes as a necessary trade-off to achieve uniform temperature distribution, which is more critical for preventing thermal damage and maintaining long-term reliability.
Solution Approach 2:
The invention introduces dynamic adjustment of bearing gaps based on real-time temperature conditions. Rather than maintaining fixed or equal gap sizes, the system dynamically varies the gaps to compensate for temperature differences, making the bearing system adaptive to thermal conditions while maintaining overall performance.
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 approach ensures consistent temperature distributions across magnet arrangements, reducing thermal expansions and maintaining operational stability even under uneven loads, which is tolerable for most applications.
Implementation Method 1
the windings of opposing magnet arrangements are supplied with electrical currents in such a way that the occurrence of different temperatures is avoided, in particular in dependence on electrical power losses in the windings
Implementation Method 2
magnet arrangements whose windings are supplied with electrical currents and which face the bearing body in the radial direction
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a magnetic bearing and to a method for operation thereof. The magnetic bearing contains a ferromagnetic, movably mounted bearing element (1) and at least two magnetic devices (3o, 3u) arranged on opposing sides of the bearing element (1) and equipped with windings (6), wherein during operation of the magnetic bearing, electric currents are conducted through the windings (6) and these currents are regulated such that in an equilibrium state between the bearing element (1) and the two magnetic devices (3o, 3u), bearing gaps (10o, 10u) of predetermined size (So, Su) form. According to the invention, the temperatures produced in the magnetic devices (3o, 3u) during operation are measured and the regulation of the currents takes place such that in the equilibrium state, regardless of the load situation, the same temperatures appear in the magnetic devices (3o, 3u) or in the windings (6) thereof (figure 1).