Method and system for limiting the current output by a speed...

Details Method and system for limiting the current output by a speed... Method and system for limiting the current output by a speed...

2007-05-15

2007-05-15

Duda, Rina (Department: 2837)

Electricity: motive power systems

Positional servo systems

'reset' systems

C318S610000, C318S811000, C318S599000, C318S432000

Reexamination Certificate

active

11339478

ABSTRACT:
The present invention relates to a method for limiting the current output by a speed controller (V) for three-phase asynchronous electric motor (M), said controller (V) operating according to a control law (LC) of pure U/F type. Said method is characterized in that it consists in calculating with the aid of a limitation function a correction value for the frequency of the stator (Wstat) then in applying thereto, so as to obtain, in the voltage control law (LC) of U/F type, a corrected frequency of the stator (Wstatc). According to the voltage control law of U/F type, the method thereafter consists on the basis of this corrected frequency of the stator (Wstatc) in obtaining the control voltage (Vqref) applied to the motor. The invention also relates to a system for limiting the current able to implement said method.

REFERENCES:
patent: 5038092 (1991-08-01), Asano et al.
patent: 5155797 (1992-10-01), Nomura et al.
patent: 5739664 (1998-04-01), Deng et al.
patent: 5747957 (1998-05-01), Hayashida
patent: 6809492 (2004-10-01), Harakawa et al.
patent: 29 31 878 (1981-02-01), None
patent: 38 20 125 (1988-12-01), None
patent: 1 229 637 (2002-08-01), None

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