Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Reexamination Certificate
2005-10-04
2005-10-04
Flechef, Marlon T. (Department: 2837)
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
C318S456000, C318S466000, C318S434000, C318S468000, C318S282000, C049S026000, C049S028000
Reexamination Certificate
active
06952087
ABSTRACT:
In the method of controlling a process for moving a part (20) by an electric motor (12) against an end stop, pinching events are detected by monitoring a motor operating variable, such as a motor rpm, and if pinching is detected the motor (12) is stopped and/or reversed. The electric power triggering the motor (12) at the start of and during a startup phase while system slack is taken up is controlled so that it is constant and lower than the power triggering the motor in an ensuing operating phase (54) in which the part (20) moves. Preferably power during the startup phase is reduced to power values that are just barely enough to move the motor while system slack is taken up. In a preferred embodiment the applied motor voltage is reduced and controlled by a power end stage that includes a bipolar transistor or a field effect transistor.
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Colon Santana Eduardo
Flechef Marlon T.
Robert & Bosch GmbH
Striker Michael J.
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