Protective device for an electric motor corresponding process an

Details Protective device for an electric motor corresponding process an Protective device for an electric motor corresponding process an

1997-08-26

2000-04-25

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 26, 361105, 318471, H02H 504

Patent

active

060551410

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.

REFERENCES:
patent: 4092573 (1978-05-01), D'Entremont
patent: 4097790 (1978-06-01), Wilson
patent: 4114077 (1978-09-01), Oates et al.
patent: 4207602 (1980-06-01), Kussy
patent: 4574229 (1986-03-01), Kim
patent: 4612480 (1986-09-01), Kneisel
patent: 4897584 (1990-01-01), Grutzmacher et al.
patent: 5408165 (1995-04-01), Voet
patent: 5546262 (1996-08-01), Baurand et al.

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