Procedure for starting an elevator

Details Procedure for starting an elevator Procedure for starting an elevator

1995-09-28

1998-03-31

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

187290, 318719, 318722, B66B 134, H02P 146, H02P 150, H02P 318

Patent

active

057341354

ABSTRACT:
In a system for starting elevator machinery driven by a synchronous motor, current is fed to the motor by a frequency converter and a traction sheave is connected to the motor to move the elevator car with hoisting ropes. 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. The frequency converter is adjusted so that a magnetic field whose direction corresponds to the new angle of the magnetic field of the stator is generated in the motor.

REFERENCES:
patent: 3737747 (1973-06-01), Krauer
patent: 4763058 (1988-08-01), Heining et al.
patent: 4852694 (1989-08-01), Arbori et al.
Abstract of Japanese Publication No. JP 2041689, Patent Abstracts of Japan, vol. 14, No. 200 (E-0920), Apr. 24, 1990.
Abstract of Japanese Publication No. JP 60-141185, Patent Abstracts of Japan, vol. 009, No. 305 (E-363), Dec. 3, 1985.

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