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.
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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.
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Citations
27 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. 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; and
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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. 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; and
reducing rotor to ground voltage on the shaft during operation. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification