Multi-pole permanent magnet synchronous machine for operating lift door, has poles arranged such that cogging torque of synchronous machine in retaining position allows retaining force to be exerted on lift door for retaining lift door

摘要

The machine has a stator and a rotor for driving a movable element i.e. lift door, where a cross-section and an arrangement of poles are such that a cogging torque of the synchronous machine in a retaining position allows retaining force to be exerted on the lift door for retaining the lift door. The poles are rectangular in cross-section, where the number of poles in the rotor and the stator are in a ratio of multiple integers, and the poles are arranged rotationally symmetrical about the stator and the rotor.