System and method of reducing bearing voltage
First Claim
Patent Images
1. A bearing system comprising:
- a frame;
a shaft;
a rotor assembly mounted on the shaft;
at least one bearing supporting the shaft in the frame; and
a capacitance enhancement mechanism by which rotor to frame capacitance is increased, wherein the capacitance enhancement mechanism comprises a labyrinth, the labyrinth comprising a ground member, a shaft-voltage reducer, and one or more gaps disposed between the ground member and the shaft-voltage reducer, wherein the one or more gaps are at least partially filled with dielectric material.
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Abstract
Technique for reducing bearing current discharges in a system by increasing the surface area between the shaft and the frame of the system and thereby increasing the rotor to frame capacitance.
46 Citations
25 Claims
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1. A bearing system comprising:
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a frame;
a shaft;
a rotor assembly mounted on the shaft;
at least one bearing supporting the shaft in the frame; and
a capacitance enhancement mechanism by which rotor to frame capacitance is increased, wherein the capacitance enhancement mechanism comprises a labyrinth, the labyrinth comprising a ground member, a shaft-voltage reducer, and one or more gaps disposed between the ground member and the shaft-voltage reducer, wherein the one or more gaps are at least partially filled with dielectric material. - View Dependent Claims (2, 3, 4)
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5. An electromechanical device comprising:
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a housing coupled to a grounded member having an enhanced surface area;
a shaft rotatably mounted to the housing; and
a shaft-voltage reducer mounted for rotation with the shaft, the shaft-voltage reducer having a corresponding surface configured to extend along the enhanced surface area to reduce common mode voltage, wherein one or more gaps are created between the grounded member and the shaft-voltage reducer and at least partially filed with a dielectric material. - View Dependent Claims (6, 7, 8, 9)
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10. A system for reducing common mode voltage comprising:
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a pulse width modulated inverter producing a common mode voltage; and
a motor having;
a housing;
a stator assembly mounted to the housing;
a shaft;
a rotor assembly coupled to the shaft and rotatably mounted within the housing via at least one bearing;
a capacitive enhancement mechanism coupled between the housing and the rotor, the capacitive enhancement mechanism having a capacitor formed by a pair of enhanced surfaces that undergo relative movement, wherein the pair of enhanced surfaces are comprised of a grounded member and a shaft-voltage reducer and where one or more gaps are disposed between the grounded member and the shaft-voltage reducer; and
a dielectric lubricant disposed to circulate within the one or more gaps. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of reducing detrimental bearing current discharges in a system having a rotor shaft rotatably mounted within a frame, comprising:
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presenting enhanced surface areas between the rotor shaft and the frame;
adjusting the difference between the enhanced surface areas to increase rotor shaft to frame capacitance;
grounding one of the enhanced surface areas to the frame;
reducing rotor to ground voltage on the shaft during operation; and
arranging one or more gaps between the enhanced surface areas and at least partially filling the gaps with a dielectric material. - View Dependent Claims (17, 18, 19)
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20. A system for reducing voltage between elements of a rotating machine, the system comprising:
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a capacitive enhancement mechanism configured to be coupled between a machine housing and a machine rotor, the capacitive enhancement mechanism having a capacitor formed by a pair of enhanced surfaces that undergo relative movement during operation, wherein the enhancement surfaces each comprise a grounded member and a shaft-voltage reducer, and where one or more gaps are disposed between the grounded member and the shaft-voltage member; and
a dielectric material disposed to circulate within the one or inure gaps. - View Dependent Claims (21, 22)
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23. A system for reducing voltage between elements of a rotating machine, the system comprising:
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a housing;
a stator assembly mounted within the housing;
a shaft;
a rotor assembly coupled to the shaft and rotatably mounted within the housing via at least one bearing;
a capacitive enhancement mechanism coupled between the housing and the rotor, the capacitive enhancement mechanism having a capacitor formed by a pair of enhanced surfaces that undergo relative movement, wherein the enhancement surfaces each comprise a grounded member and a shaft-voltage reducer, and where one or more gaps are disposed between the grounded member and the shaft-voltage member; and
a dielectric material disposed to circulate within the one or more gaps. - View Dependent Claims (24, 25)
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Specification