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公开(公告)号：US20230117062A1
公开(公告)日：2023-04-20
申请号：US17906470
申请日：2021-02-08
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Jahirul Islam , Reza Rajabi Moghaddam
Abstract: A method of identifying a fault in a synchronous reluctance electric machine, the method including carrying out a first vibration measurement on a stator in a first radial direction of the stator; carrying out a second vibration measurement on the stator in a second radial direction of the stator; determining, on the basis of at least one of the first vibration measurement and the second vibration measurement, a first vibration frequency; determining, on the basis of the first vibration measurement and the second vibration measurement, a mode shape of the vibration at the first vibration frequency; and determining, on the basis that the first vibration frequency fb and the mode shape m fulfil the following barrier fault conditions: fb=fr, and m=1 where fr is a rotation frequency of a rotor, that a flux barrier of the rotor is defect.
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公开(公告)号：US11719569B2
公开(公告)日：2023-08-08
申请号：US17906470
申请日：2021-02-08
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Jahirul Islam , Reza Rajabi Moghaddam
CPC classification number: G01H1/003 , G01R31/343 , H02K1/246 , H02K2213/03
Abstract: A method of identifying a fault in a synchronous reluctance electric machine, the method including carrying out a first vibration measurement on a stator in a first radial direction of the stator; carrying out a second vibration measurement on the stator in a second radial direction of the stator; determining, on the basis of at least one of the first vibration measurement and the second vibration measurement, a first vibration frequency; determining, on the basis of the first vibration measurement and the second vibration measurement, a mode shape of the vibration at the first vibration frequency; and determining, on the basis that the first vibration frequency fb and the mode shape m fulfil the following barrier fault conditions:
fb=fr, and m=1
where fr is a rotation frequency of a rotor, that a flux barrier of the rotor is defect.-
公开(公告)号：US10992192B2
公开(公告)日：2021-04-27
申请号：US16959021
申请日：2018-11-13
Applicant: ABB Schweiz AG
Inventor： Konstantina Bitsi , Reza Rajabi Moghaddam , Stefan Toader
Abstract: A stator core or a rotor core for an electrical machine, the core including a plurality of teeth separated by slots in a circumferential direction of the core, and a plurality of lamination stacks arranged one after another in an axial direction of the core, and separated from each other in the axial direction by cooling ducts. Each lamination stack includes at its each end in the axial direction at least one slit tooth section providing a discontinuity in the electrical conductivity of the lamination material and thereby reducing eddy current losses at the respective slit tooth section, and between the slit tooth sections at least one regular tooth section.
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公开(公告)号：US20200336025A1
公开(公告)日：2020-10-22
申请号：US16959021
申请日：2018-11-13
Applicant: ABB Schweiz AG
Inventor： Konstantina Bitsi , Reza Rajabi Moghaddam , Stefan Toader
Abstract: A stator core or a rotor core for an electrical machine, the core including a plurality of teeth separated by slots in a circumferential direction of the core, and a plurality of lamination stacks arranged one after another in an axial direction of the core, and separated from each other in the axial direction by cooling ducts. Each lamination stack includes at its each end in the axial direction at least one slit tooth section providing a discontinuity in the electrical conductivity of the lamination material and thereby reducing eddy current losses at the respective slit tooth section, and between the slit tooth sections at least one regular tooth section.
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