Rotor shaft portion, locking device, electric motor drive unit, and vehicle

Abstract

The invention relates to a rotor shaft portion (2) for an externally excited synchronous machine of an electric motor drive unit, in particular for driving a vehicle. The rotor shaft portion (2) is made, in portions, from a plastics material in which metal contacting means for externally exciting the synchronous machine are embedded. The contacting means comprise at least two slip rings (12, 14) for contacting an associated brush (20, 22), and at least one conductor track (16, 18) which is associated with each slip ring (12, 14) and extends from the associated slip ring (12, 14) through the plastics material of the rotor shaft portion (2). The invention proposes shaping one of the at least two slip rings (14) so that it has a front-face metal portion (24) having metal interruptions (U) in the circumferential direction of the rotor shaft portion (2), the front-face metal portion (24) being designed to interact with an associated signal generator (26) to detect the position of a rotor of the synchronous machine. The invention also relates to a locking device, to an electric motor drive unit and to a vehicle.

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