Electric motor and an elevator system

An elevator system, comprising:

• a sheave;
• and
• an electric motor configured to drive the sheave to rotate and comprising:
• a casing;
• a stator supported by the casing, the stator comprising a stator yoke and stator teeth, and a winding being wound around the stator teeth and generating a magnetic field when energized;
• and
• a rotor which rotates under the action of the magnetic field;
• characterized in that at least a portion of the stator yoke is formed as a moving plate which is movable between a first position and a second position;
• wherein when the winding is energized, the moving plate is capable of moving from the first position to the second position under the action of the magnetic field, and wherein in the second position, the moving plate is separated from the rotor;
• and
• wherein after the winding is de-energized, the moving plate is moved from the second position to the first position under the action of a spring force generated by the moving plate itself or by a spring member, so that the moving plate comes into contact with the rotor to provide a braking force to the rotor.