Protection device for electric motor driving devices and...

Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control

Reexamination Certificate

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Details

C318S254100, C318S434000, C363S023000, C363S030000, C363S093000

Reexamination Certificate

active

07408311

ABSTRACT:
A protection device protects a driving device of an electric motor with at least three phases and at least three windings and the driving device comprises a power stage suitable for driving directly said at least three windings. The driving device is suitable for actuating a motor brake operating phase and comprises detectors suitable for detecting the currents that run in the windings of the motor. The protection device comprises selectors suitable for selecting the currents having a single direction between said detected currents and a deactuator suitable for deactuating the power stage during said motor brake operating phase when the sum of the currents having a single direction is greater than a reference current.

REFERENCES:
patent: 4404478 (1983-09-01), Rischmuller
patent: 4654568 (1987-03-01), Mansmann
patent: 5495154 (1996-02-01), Carobolante
patent: 5939863 (1999-08-01), Miller
patent: 2005/0286194 (2005-12-01), Fujiki et al.

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