Title:
METHOD FOR MONITORING THE STATE OF A BEARING GUIDING AN ELECTRIC MOTOR ON A SHAFT
Document Type and Number:
WIPO Patent Application WO/2013/079492
Kind Code:
A3
Abstract:
The invention relates to a method for monitoring the state of a bearing (13) guiding an electric motor (1) on a shaft (2), comprising the steps of: determining (S100) a first measure m1 for a first distance a1 between a reference point on a housing (12) of the electric motor (1) and a reference point on a rotor (10) of the electric motor (1) in the axial direction of the shaft (2) at a first point in time t1 at which the electric motor (1) has a negative torque; determining (S200) a second measure m2 for a second distance a2 between the reference point on the housing (12) and the reference point on the rotor (10) in the axial direction of the shaft (2) at a second point in time t2 at which the electric motor (1) has a positive torque; comparing (S300) the difference m1-m2 between the first measure m1 and the second measure m2 with a threshold value ms; and recognising (S400) a critical state of the bearing (13) depending on the result of comparing the difference m1-m2 with the threshold value ms.
Inventors:
BAUMANN THOMAS (DE)
TÖNS MATTHIAS (DE)
TÖNS MATTHIAS (DE)
Application Number:
PCT/EP2012/073758
Publication Date:
May 30, 2014
Filing Date:
November 27, 2012
Export Citation:
Assignee:
CONTINENTAL AUTOMOTIVE GMBH (DE)
International Classes:
G01M13/04
Domestic Patent References:
| WO2011011573A1 | 2011-01-27 |
Foreign References:
| DE102007011733A1 | 2008-09-11 |
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