Invention Grant
- Patent Title: Electrical machine with an active grounding
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Application No.: US15762459Application Date: 2016-10-04
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Publication No.: US11342819B2Publication Date: 2022-05-24
- Inventor: Pedro Rodriguez , Subrat Sahoo , Cajetan Pinto , Klaus Vänskä
- Applicant: ABB Schweiz AG
- Applicant Address: CH Baden
- Assignee: ABB Schweiz AG
- Current Assignee: ABB Schweiz AG
- Current Assignee Address: CH Baden
- Agency: Whitmyer IP Group LLC
- Priority: EP15188912 20151008
- International Application: PCT/EP2016/073635 WO 20161004
- International Announcement: WO2017/060218 WO 20170413
- Main IPC: H02P27/08
- IPC: H02P27/08 ; H02P6/18 ; H02K11/40 ; H02P29/50 ; H02P31/00 ; H02K11/00 ; H02P29/032

Abstract:
A method for preventing a frequency component of a voltage from occurring in an electrical machine including the steps of: obtaining, either by measuring a voltage signal or a current signal from the electrical machine in time domain and transforming the measured signal into frequency domain, by simulating or deducing a first frequency component present in the electrical machine in absence of a grounding, the first frequency component representing a first undesired frequency higher than a limit frequency of 500 Hz; and providing the electrical machine with a first grounding at a grounding location, the first grounding including a resonant circuit resonating at the first undesired frequency. In order to get rid of harmful shaft voltages in the form of sharp voltage peaks at high frequencies, it is first necessary to determine at which undesired frequency or frequencies these voltage peaks occur. Only thereafter can a low impedance grounding be provided that works satisfactorily at the undesired frequency or frequencies.
Public/Granted literature
- US20180269753A1 ELECTRICAL MACHINE WITH AN ACTIVE GROUNDING Public/Granted day:2018-09-20
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