公开(公告)号：US10811942B2

公开(公告)日：2020-10-20

申请号：US13892715

申请日：2013-05-13

Applicant: ABB Schweiz AG

Inventor： Yujing Liu ,  Pierluigi Tenca

IPC: H02K11/33 ,  H02P6/08

Abstract: A rotating electrical machine including a stator or rotor including a plurality of serially connected switching cells. Each switching cell includes a winding subsection and a current reverser arranged to controllably alter a current direction through the winding subsection, and each current reverser includes a capacitor arranged to form a resonant circuit in cooperation with the winding subsection.

公开(公告)号：US20170099019A1

公开(公告)日：2017-04-06

申请号：US15122854

申请日：2015-03-31

Applicant: ABB SCHWEIZ AG

Inventor： Sjoerd Bosga ,  Veli-Matti Leppanen ,  Mehanathan Pathmanathan ,  Robert Chin ,  Yujing Liu

IPC: H02P6/15

CPC classification number: H02P6/15 ,  H02P6/26

Abstract: A commutation circuit includes a coil connected to an H bridge, the H bridge including four main switches for reversing polarity and a resulting coil current in the coil. The commutation circuit further includes a voltage source configured to generate a bypass current, and at least one auxiliary switch for controlling the bypass current to thereby decrease a switch current through at least one of the main switches. By generating an appropriate bypass current with help of a voltage source, a switch current through a desired main switch in a leading state can be decreased and eventually brought to zero. Zero current in its turn enables the use of thyristors as main switches as it results in the thyristors to be turned off automatically. Furthermore, decreased switch current at the switching moment reduces switching losses even in different types of switches such as GTOs and IGBTs.