ANGLE MEASURING APPARATUS IN A SYNCHRONOUS MOTOR COMPRISED IN AN ELEVATOR MACHINERY AND PROCEDURE FOR DETECTING THE POSITION OF A MOTOR POLE

摘要

In a permanent magnet synchronous motor (21) comprised in an elevator machinery (6), angle measurement is implemented by detecting the position of a rotor pole by means of a detector (1) measuring the magnetic field. The magnetic field generated by the permanent magnets of the rotor (113) is measured at a point close to the rotor circle (113).