公开(公告)号：US3577048A

公开(公告)日：1971-05-04

申请号：US3577048D

申请日：1968-12-26

Applicant: ASEA AB

Inventor： NORDIN TORE

IPC: B60L3/10 ,  B61C15/08

CPC classification number: B60L3/10 ,  B60L2200/26 ,  Y02T10/646 ,  Y02T10/648

Abstract: A driving system for an electric locomotive has a plurality of parallel-connected direct current motors each connected to a pair of wheels and connected by their armature windings to a variable alternating current source by a rectifier. Each motor has a field winding connected to a control current source to receive signals from the source to reduce the field. Each armature circuit feeds to a selection device a magnitude proportional to the armature current. The selection device selects the greatest of these magnitudes, which is compared with each of the magnitudes proportional to the armature current, which signal is then fed to the field winding. The control signal is maintained below a certain maximum value.