Abstract: An electric motor comprises a flange at one end, the corner portions of the flange projecting over the outline of the stator. A ventilator is provided at the opposite end, having outlets which are in alignment with the corner portions. The ventilator does not project over the borderline of the flange.

Abstract: A flange motor for a sewing machine comprises a motor casing with a drive shaft journal projecting over the latter. A casing flange, on which an adapter flange is mounted, is allocated to the drive shaft journal.

Abstract: A rotor for an electric motor, energized by a permanent magnet, has an essentially cylindrical rotor body (1), with shaft sections (7, 8) coaxially distant from the rotor body (1). Permanent magnets (21) are fastened to the outer periphery (16) of the rotor body (1). In order to counterbalance the rotor, balance weight rings (6), in which weights (26) are inserted and which are disposed on seat sections (5) formed on the rotor body (1), are mounted on the rotor body (1).

Abstract: A rotor for an electric motor energized by permanent magnet means comprises positioning devices for permanent magnets. These positioning devices consist of positioning rings disposed in the region of each end face of a rotor body and at least one inner positioning ring disposed on the rotor body between the two. The positioning rings comprise positioning webs which extend only over a small part of the length of the outer peripheral surface of the rotor body and which partially define compartments for in each case a permanent magnet. On the one hand, this ensures accurate and simple mounting of the permanent magnet while at the same time it reduces the moment of inertia of the rotor.