Process and device for determining a run-away condition of a...

Details Process and device for determining a run-away condition of a... Process and device for determining a run-away condition of a...

2007-05-15

2007-05-15

Leja, Ronald W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Overspeed responsive

Reexamination Certificate

active

10462300

ABSTRACT:
A process and device for determining a run-away condition of a rotation-speed controlled, permanent-excited synchronous motor are described. The process continuously checks, when a rotation speed controller is active and for a predetermined constant rotation speed setpoint, several conditions, either alone or in combination, and generates an error signal if the particular condition or the combination of conditions, when continuously checked, is/are always satisfied during at least a predetermined time interval. These conditions include: determining if the magnitude of a measured deviation in the rotation speed between a measured actual rotation speed value and the predetermined constant rotation speed setpoint increases or reaches a limit value; if the magnitude of a control variable present at the output of a rotation speed controller increases or reaches a limit value; and if the magnitude of a measured acceleration value and/or the magnitude of a torque-producing current increases or reaches a limit value.

REFERENCES:
patent: 3144917 (1964-08-01), Tressel
patent: 6014307 (2000-01-01), Crimmins
patent: 43 30 823 (1995-03-01), None
patent: 44 32 058 (1996-03-01), None
patent: 05008962 (1993-01-01), None

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