Menetelmä hissin käynnistämiseksi

摘要

The invention relates to a procedure for starting an elevator machinery driven by a synchronous motor. The synchronous motor (2) is fed via a frequency converter (11) and a traction sheave (12) is connected to the motor (2) to move the elevator car (18) by means of hoisting ropes (14). According to the invention, the angle of the magnetic field of the stator is determined when the elevator stops. When the motor is started again, a new value (Bs2) of the angle of the magnetic field of the stator is determined on the basis of the change in the load signal (Wg) and the frequency converter (11) is so adjusted that a magnetic field whose direction corresponds to the new angle (Bs2) of the magnetic field of the stator is generated in the motor (2).