Electrical machine for use in e.g. roller mill drive, has air gap provided between stator and rotor, where air gap has subareas with different radial expansions arranged side by side in axial middle section

摘要

The machine (1) has a rotor (5) rotatably supported around a rotational axis (7), and an air gap (8) provided between a stator (3) and the rotor. The air gap has subareas (10, 11) that are arranged side by side in an axial middle section, where the subareas have different radial expansions (W1). The radial expansions have a cascaded progression in a direction of the rotational axis. The subareas are formed by profiling a wall surface. The air gap is implemented in an axial direction.