Encoder

An encoder for detecting measured values which are dependent on the rotation angle of the shaft of a motor or the like, comprising a rotor, which can be fixed on the shaft, and comprising a stator, which can be fixed by a bearing surface on an attachment surface of the motor and has a scanning means for detecting the relative rotational position of rotor and stator, wherein, in the mounted state, the rotor is fixed on the shaft and the stator is fixed on the attachment surface in such a way that the rotor and the scanning means have a defined axial distance (h), and wherein, for mounting purposes, firstly the encoder is pushed onto the shaft until the stator is held in a mounting auxiliary position with its bearing surface at an axial distance from the attachment surface, the axial distance corresponding to the defined distance (h), then the rotor, in this mounting auxiliary position of the stator, is brought axially to bear against the scanning means and is fixed on the shaft and, finally, the stator is moved by its bearing surface by the defined distance (h) towards the attachment surface into a mounting end position and is fixed on the attachment surface,

• characterized in that the bearing surface of the stator has a shoulder projecting beyond the plane of the bearing surface by the height of the defined distance (h), in that, in the mounting auxiliary position, the stator bears against the attachment surface by the shoulder, and in that, in a mounting end position rotated about the axis of the encoder relative to the mounting auxiliary position, the shoulder descends into a recessed receptacle of the attachment surface, such that the stator is displaced with the scanning means by the defined axial distance (h) axially relative to the rotor fixed on the shaft.