Importance

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Abstract

The invention provides an arrangement for determining the speed and rotor position of an electric machine, which arrangement consists of a tachometer generator having a permanent-magnet-excited rotor and a coaxially arranged rotor position transmitter which has a rotor body equipped with permanent magnets. Around the circumference of the rotor body magnetic-field sensitive sensor elements are arranged. A compact assembly of the tachometer generator and rotor position transmitter without detrimental mutual interference is possible by the provision that first permanent magnets magnetized in the tangential direction are arranged centered to the pole gaps of the tachometer generator rotor at the rotor body in such a manner that the sides of two adjacent permanent magnets facing each other have the same polarity as the magnet pole extending between the respective pole gaps of the tachometer generator rotor. Furthermore at least one second permanent magnet magnetized in the direction of an axis of rotation is arranged on the side of the rotor body adjacent to the tachometer generator rotor, centered relative to each two first permanent magnets in such a manner that its side facing the tachometer generator rotor has the opposite polarity (N or S, respectively) as the opposite magnet pole of the tachometer generator rotor.

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First Claim