Deceleration during mains break

Details Deceleration during mains break Deceleration during mains break

2005-06-21

2005-06-21

Masih, Karen (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S433000, C318S434000

Reexamination Certificate

active

06909254

ABSTRACT:
A method and an arrangement for stopping sectional drive controllably in connection with a fault situation in the supplying mains, the sectional drive comprising a plurality of inverters (4) which are supplied by a DC intermediate circuit (3) supplied by the mains (1), a plurality of electric motors (5) which are controlled by inverters with speed and/or torque control and which are used for implementing speed and tightness reference values of the strip in the sectional drive system, the tightness reference value being predetermined motor-specifically or motor-group-specifically. Prior to stopping the sectional drive, the method comprises the implementing step of predetermining an estimate (T) of the time needed for stopping the motors, whereby the method comprises the steps, in connection with a fault situation, of detecting a fault situation in the supplying mains, forming a deceleration reference value for the motors for stopping the motors within a predetermined time, controlling the speed of the speed-controlled motors in the sectional drive on the basis of the deceleration reference value, controlling the torque of the torque-controlled motors in the sectional drive on the basis of the predetermined tightness reference value, determining the magnitude of the DC voltage intermediate circuit (3) and altering the deceleration reference value on the basis of the magnitude of the DC voltage.

REFERENCES:
patent: 5196769 (1993-03-01), Chiba et al.
patent: 2003/0182042 (2003-09-01), Watson et al.
patent: 2003/0196647 (2003-10-01), Christner et al.
patent: 2000 152693 (2000-10-01), None
patent: 97/02650 (1997-01-01), None

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