System and method for preventing stator permanent magnet demagnetization during vacuum pressure impregnation
Abstract
A permanent magnet electrical machine includes a stator having conductive windings wound thereon and one or more permanent magnets embedded in the stator. A magnetic keeper element is positioned on the stator so as to form a magnetic flux path with the permanent magnets, with the magnetic keeper element closing the magnetic flux path of the permanent magnets by providing a low reluctance flux path to magnetic flux generated by the permanent magnets. A vacuum pressure impregnation (VPI) process is performed on the stator to increase a thermal conductivity of the windings, with the VPI process including a curing step that is performed at a selected temperature. The magnetic keeper element sets an operating point of the permanent magnets to an internal flux density level above a demagnetization threshold associated with the selected temperature at which the curing step is performed.
- Inventors:
- Issue Date:
- Research Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EE) (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1361419
- Patent Number(s):
- 9673667
- Application Number:
- 14/337,469
- Assignee:
- GENERAL ELECTRIC COMPANY
- Patent Classifications (CPCs):
-
H - ELECTRICITY H02 - GENERATION H02K - DYNAMO-ELECTRIC MACHINES
- DOE Contract Number:
- EE0005573
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2014 Jul 22
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Raminosoa, Tsarafidy, Alexander, James Pellegrino, and EL-Refaie, Ayman Mohamed Fawzi. System and method for preventing stator permanent magnet demagnetization during vacuum pressure impregnation. United States: N. p., 2017.
Web.
Raminosoa, Tsarafidy, Alexander, James Pellegrino, & EL-Refaie, Ayman Mohamed Fawzi. System and method for preventing stator permanent magnet demagnetization during vacuum pressure impregnation. United States.
Raminosoa, Tsarafidy, Alexander, James Pellegrino, and EL-Refaie, Ayman Mohamed Fawzi. Tue .
"System and method for preventing stator permanent magnet demagnetization during vacuum pressure impregnation". United States. https://www.osti.gov/servlets/purl/1361419.
@article{osti_1361419,
title = {System and method for preventing stator permanent magnet demagnetization during vacuum pressure impregnation},
author = {Raminosoa, Tsarafidy and Alexander, James Pellegrino and EL-Refaie, Ayman Mohamed Fawzi},
abstractNote = {A permanent magnet electrical machine includes a stator having conductive windings wound thereon and one or more permanent magnets embedded in the stator. A magnetic keeper element is positioned on the stator so as to form a magnetic flux path with the permanent magnets, with the magnetic keeper element closing the magnetic flux path of the permanent magnets by providing a low reluctance flux path to magnetic flux generated by the permanent magnets. A vacuum pressure impregnation (VPI) process is performed on the stator to increase a thermal conductivity of the windings, with the VPI process including a curing step that is performed at a selected temperature. The magnetic keeper element sets an operating point of the permanent magnets to an internal flux density level above a demagnetization threshold associated with the selected temperature at which the curing step is performed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {6}
}
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