Procedure for starting an elevator

B - Operations – Transporting – 66 – B

Patent

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B66B 1/00 (2006.01) B66B 1/28 (2006.01) H02P 6/18 (2006.01)

Patent

CA 2159405

The invention relates to a method for starting elevator machinery driven by a synchronous motor. The synchronous motor is fed via a frequency converter, and a traction sheave is connected to the motor to move the elevator car by means of hoisting ropes. 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 of the angle of the magnetic field of the stator is determined on the basis of the change in the load signal, and the frequency converter is so adjusted that a magnetic field whose angle corresponds to the new angle of the magnetic field of the stator is generated in the motor.

Cette invention porte sur une méthode de mise en marche d'un ascenseur entraîné par un moteur synchrone. Le moteur synchrone est alimenté au moyen d'un convertisseur de fréquence, et un rouet de tractage est raccordé au moteur pour déplacer la cabine d'ascenseur au moyen de câbles de levage. Selon cette invention, l'angle du champ magnétique du stator est déterminée lorsque l'ascenseur s'arrête. Lorsque le moteur redémarre, une nouvelle valeur de l'angle du champ magnétique du stator est déterminée sur la base du changement dans le signal de charge, et le convertisseur de fréquence est réglé de façon à générer un nouveau champ magnétique dans le moteur dont l'angle correspond au nouvel angle du champ magnétique du stator.

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