Protective device for an electric motor corresponding process and drive device with an electric motor including said protective device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 25, 2000
Grant Date -
N/A
app pub date -
Aug 26, 1997
filing date -
Aug 26, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A protective device suitable for being placed in the power supply circuit of an electric motor, having at least one anti-interference coil (20, 30) for the motor, and a thermal switch (10) thermally coupled to coil (20, 30) and capable of opening the power supply circuit when the coil temperature which it detects reaches a predetermined value, representative of the maximum temperature threshold allowed within the motor. Advantageously, the device also has an electric heating element, thermally coupled to the switch and capable of constituting a main current path between the two input terminals of a four-terminal network consisting of the protective device, when the power supply circuit is open, and capable of holding this circuit open in order to limit the opening-closing cycles of the switch, the invention also pertains to the corresponding process and to a drive device containing a motor and of said protective device mounted on the motor, outside of it.
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