Thermal protection of electromagnetic actuators

Details Thermal protection of electromagnetic actuators Thermal protection of electromagnetic actuators

2004-12-21

2009-02-24

Benson, Walter (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

C187S391000, C374S163000

Reexamination Certificate

active

07493990

ABSTRACT:
The present invention provides a method and apparatus for thermally protecting an electromagnetic actuator used to suppress vibrations in an elevator installation. The apparatus includes a temperature evaluation unit that determines an actual temperature of the actuator on the basis of a signal proportional to a current supplied to the actuator. A limiter restricts the current supplied to the actuator if the actual temperature of the actuator as determined by the temperature evaluation unit is greater than a predetermined temperature.

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