In terms of dimension and efficiency, electric vehicle drives with PM (permanent magnet) excitation are advantageous in comparison to DC or induction motors. Modern technologies in material, electronics an control allow the construction of cost competitive drives. One question which has been brought up in discussion has been the effect of failures in the system and their impact on drive unit, vehicle or people. This article will focus on this aspect in order to explain major failures and ways to assure maximum operation and security of material and persons. Security aspects in PM drive system and in an induction drive systems are to be treated similarly. The 12 V power supply has been adapted to the needs of this drive, motor and vehicle control have to fail safe, and power electronics has to be designed for loss of control. Short-circuits cannot be avoided entirely, but their effects can be sufficiently limited. In brief, a consequent system approach including motor, power electronics and control can already reduce most of the effects of failures of a PM drive . With little additional means, the consequences of failures when using a PM drive are equivalent to those when using induction motor drives or thermal engines.
Failure modes of a PM synchronous drive
Störanfälligkeit des Synchronantriebs mit Dauermagneten für Elektrofahrzeuge
1995
8 Seiten, 6 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
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