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公开(公告)号：US3560816A
公开(公告)日：1971-02-02
申请号：US3560816D
申请日：1968-10-14
Applicant: ASEA AB
Inventor： FRANZEN SIGFRID
CPC classification number: B60L11/04 , B60L2200/26 , Y02T10/646 , Y02T10/648 , Y02T10/70 , Y02T10/7077
Abstract: An electrical traction system with parallel-connected groups of series motors is provided with means for switching over to a condition with a constant number of field ampere turns when maximal adhesion is desired.
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