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1. (WO2018160122) SYNCHRONOUS MACHINE WITH ROTOR FIELD WINDINGS AND METHOD FOR ITS OPERATION

Pub. No.:    WO/2018/160122    International Application No.:    PCT/SE2018/050184
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Feb 28 00:59:59 CET 2018
IPC: H02P 1/46
H02K 19/12
H02P 3/18
Applicants: MAGSTRÖM AB
Inventors: LUNDIN, Urban
ABRAHAMSSON, Johan
PEREZ-LOYA, J Jose
Title: SYNCHRONOUS MACHINE WITH ROTOR FIELD WINDINGS AND METHOD FOR ITS OPERATION
Abstract:
An electrical synchronous machine (1) comprises a rotor (20) with rotor field windings (22) and a stator (10) with stator windings as well as a rotor power supply (50) and a stator power supply (60). The rotor power supply (50) is arranged to supply rotor field current for causing a magnetization of rotor magnetic poles (24). The stator power supply is arranged to supply alternating stator current for causing a rotating stator magnetic field. The electrical synchronous machine (1) further comprises at least one sensor (30), arranged to measure a quantity that is dependent on a relative angle between the rotor (20) and the rotating stator magnetic field. The electrical synchronous machine further comprises a rotor magnetization control arrangement (40), arranged for repeatedly varying amplitude and/or direction of the rotor current as a response to a change of the measured quantity. A corresponding control method is also disclosed.