Test system

A system comprising:

• a test vehicle which is equipped with at least one test device and is adapted to be inserted into an air gap between a rotor and a stator of an electric machine, which stator has axially extending laminated core teeth and copper rods disposed between the laminated core teeth, and is adapted to be rectilinearly displaced along the laminated core teeth of the stator so as to test the state of the stator in a region of an internal circumferential face and/or the state of the rotor in a region of an external circumferential face while using the at least one test device, and
• a track changeover unit which is insertable into the air gap between the rotor and the stator and is displaceable in the circumferential direction on the stator, comprising a parking cassette which is adapted for receiving the test vehicle and which the test vehicle can move into and out of in the axial direction through a parking cassette opening, at least one drive unit which has at least one motor and is adapted to move the track changeover unit, conjointly with the test vehicle received in the parking cassette, in the circumferential direction, and
• a controller for controlling at least the track changeover unit.