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1. (WO2015124876) METHOD FOR MEASURING THE AGEING OF PERMANENT MAGNETS OF A SYNCHRONOUS MACHINE FITTED WITH AN ANGULAR POSITION SENSOR

Pub. No.:    WO/2015/124876    International Application No.:    PCT/FR2015/050414
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Sat Feb 21 00:59:59 CET 2015
IPC: G01R 33/04
H02P 29/02
H02P 25/02
G01R 31/34
H02P 21/14
H02P 23/14
B60L 11/12
Applicants: LOHR ELECTROMECANIQUE
Inventors: DUMAS, Pierre
Title: METHOD FOR MEASURING THE AGEING OF PERMANENT MAGNETS OF A SYNCHRONOUS MACHINE FITTED WITH AN ANGULAR POSITION SENSOR
Abstract:
The invention relates to a method for measuring ageing of permanent magnets (4) of a synchronous machine (1) comprising a stator (2) and a rotor (3), said machine (1) being fitted with at least one angular position sensor (la) of the rotor (3), the rotor (3) comprising the permanent magnets (4) provided to move said rotor around the stator (2), the angular position sensor (la) comprising at least two fixed magnetic induction measurement sensors (6) extending to an axial end (3a) of the rotor (3), facing and immediately adjacent to the axial edges (4a) of the permanent magnets (4), characterized in that said method consists of: j1) determining, while stopped or during a laden or unladen rotation phase of the synchronous machine (1), the maximum value of the magnetic induction using the magnetic induction measurement sensors (6) and the electronic unit; j2) comparing the measured maximum magnetic induction value with a reference value; and j3) if the maximum magnetic induction value is less than the reference value, presenting a difference determined with respect to said reference value in order to generate warning information S using the electronics unit and, if this is not the case, returning to step j1).