Electric motor for driving a vehicle flap, use and method of manufacturing of the electric motor

An electric motor for driving a vehicle flap, the electric motor comprising:

• a. a hollow-cylindrical shaped stator having a permanent magnetic material and arranged coaxially to a motor axis;
• b. a motor shaft arranged coaxially to the motor axis and at least partially in the stator and mounted rotatably relative to the stator about the motor axis;
• c. a drive rotor disposed in the stator and mounted on the motor shaft, including a plurality of coils for driving rotation of the motor shaft relative to the stator about the motor axis;
• and
• d. a brake rotor arranged in the stator and fixed along the motor axis next to the drive rotor on the motor shaft, the brake rotor being magnetisable by the stator;
• wherein the brake rotor is spaced from the motor shaft radially to the motor axis by a spacer sleeve;
• wherein the spacer sleeve is plastic;
• wherein the spacer sleeve contains a number of recesses for reducing thermal expansion of the spacer sleeve;
• and
• wherein the spacer sleeve comprises an inner cylinder in contact with the motor shaft, and an outer cylinder in contact with the brake rotor, wherein the outer cylinder is spaced from the inner cylinder radially to the motor axis and is connected to the inner cylinder only by a number of webs, wherein the recesses are located between the webs.