Method for on-line detection of liquid and potential for the occurrence of resistance to ground faults in active magnetic bearing systems
First Claim
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1. A magnetic bearing monitoring system, comprising:
- one or more radial bearings arranged within a casing, each radial bearing having radial bearing coils configured to levitate a rotatable shaft;
a cooling loop configured to circulate a cooling gas to the bearing cavities;
a dummy bearing arranged in the cooling loop and having at least one dummy bearing coil made of an electrical winding; and
a sensing device communicably coupled to the electrical winding to monitor a resistance to ground for the at least one dummy bearing coil, wherein the resistance to ground of the at least one dummy bearing coil is indicative of a resistance to ground of the radial bearing coils.
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Abstract
A resistance to ground monitoring system for a magnetic bearing is disclosed. The system includes a dummy bearing arranged in a cooling loop and having a dummy bearing coil made up of an electrical winding that is configured to detect the resistance to ground for the dummy bearing coil. The electrical winding is communicably coupled to a sensing device that monitors the resistance to ground for the dummy bearing coil. Since the magnetic bearing is arranged within the same cooling loop, the resistance to ground for the dummy bearing coil is indicative of a resistance to ground for the radial bearing coils of the magnetic bearing.
420 Citations
20 Claims
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1. A magnetic bearing monitoring system, comprising:
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one or more radial bearings arranged within a casing, each radial bearing having radial bearing coils configured to levitate a rotatable shaft; a cooling loop configured to circulate a cooling gas to the bearing cavities; a dummy bearing arranged in the cooling loop and having at least one dummy bearing coil made of an electrical winding; and a sensing device communicably coupled to the electrical winding to monitor a resistance to ground for the at least one dummy bearing coil, wherein the resistance to ground of the at least one dummy bearing coil is indicative of a resistance to ground of the radial bearing coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of monitoring a magnetic bearing, comprising:
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circulating a cooling gas through a magnetic bearing arranged in a cooling loop, the magnetic bearing having a plurality of bearing coils; circulating the cooling gas through a dummy bearing arranged in the cooling loop, the dummy bearing having at least one dummy bearing coil made of an electrical winding; and detecting a resistance to ground of the at least one dummy bearing coil with a sensing device communicably coupled to the electrical winding, wherein the resistance to ground of the at least one dummy bearing coil is indicative of a resistance to ground of the plurality of bearing coils. - View Dependent Claims (12, 13, 14, 15)
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16. A dummy bearing, comprising:
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a bearing stator having one or more protrusions extending radially inward therefrom; an electrical winding wrapped around the one or more protrusions to form one or more dummy bearing coils; and a sensing device communicable with the electrical winding to monitor the resistance to ground of the one or more dummy bearing coils, wherein the dummy bearing is arranged within a cooling loop having at least one magnetic bearing, and the resistance to ground of the one or more dummy bearing coils is indicative of a resistance to ground for bearing coils of the at least one magnetic bearing. - View Dependent Claims (17, 18, 19, 20)
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Specification