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1. (WO2018202277) METHOD OF OPERATION FOR AN ELECTRIC MOTOR, AND SOFT STARTER

Pub. No.:    WO/2018/202277    International Application No.:    PCT/EP2017/060369
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Wed May 03 01:59:59 CEST 2017
IPC: H02P 23/00
H02P 1/46
H02P 29/64
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: NANNEN, Hauke
ZATOCIL, Heiko
Title: METHOD OF OPERATION FOR AN ELECTRIC MOTOR, AND SOFT STARTER
Abstract:
The invention relates to a method (100) for operating an electric motor (10), in particular a permanently excited synchronous motor, comprising the steps of: a) establishing an orientation (25) of the rotor (14) in relation to the stator (12) of the electric motor (10) in which the magnetic north poles (22) and magnetic south poles (24) of said rotor and stator are opposite one another; b) generating a test pulse (30) in a stator winding (15) of the electric motor (10) along the orientation (25) of the rotor (14) in relation to the stator (12); c) ascertaining a motor inductance (37) in a starting phase (42) and/or end phase (51) of a detection window (40), and/or d) ascertaining a motor resistance (31) in an amplitude phase (44) situated between the starting phase (42) and the end phase (51); wherein a motor voltage (34) is at a maximum (36) in the starting phase (42) and/or in the end phase (51).