Radi M Pejouhy

US Patent:

40865584, Apr 25, 1978

Filed:

Feb 9, 1976

Appl. No.:

5/656459

Inventors:

Radi Pejouhy - Marshfield MA
Joseph L. McMorrow - West Bridgewater MA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H01H 3752

US Classification:

337102

Abstract:

A motor protector characterized by low cost, by improved service life and by improved cycling properties has a bimetallic element mounted in a metal housing to move a first contact along a selected axis to engage and disengage a complementary contact in response to changes in element temperature. An electrical resistance heater coil, preferably with less than one full coil convolution, is oriented and secured externally of the housing so that the axis of the magnetic field established by the heater coil is coincident with the axis of movement of the first contact. The properties of the heater are selected relative to the thermal mass of the protector so that, when the heater and the protector contacts are arranged in series with motor windings, the external heater is adapted to heat the entire thermal mass of the protector to a sufficient temperature in response to the occurrence of selected overload or fault currents in the motor windings to actuate the bimetallic element to open the winding circuit before excessive overheating of the motor windings can take place. In this arrangement, the heater orientation avoids magnetic deflection of arcs occurring during opening of the protector circuit, thereby improving service life, and the heating of the entire thermal mass of the protector in opening the protector circuit retards subsequent reclosing of the circuit, thereby improving cycling properties of the protector. Preferably, the protector is mounted in a common housing with motor starter means to utilize common terminals with the stater means.

US Patent:

46227393, Nov 18, 1986

Filed:

Sep 12, 1985

Appl. No.:

6/775192

Inventors:

Radi Pejouhy - Marshfield MA
Stephen J. Benner - Woonsocket RI
Joshua Loring - Wrentham MA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H01H 1100

US Classification:

29622

Abstract:

A miniature thermostatic switch of the type that can be inserted into the windings of electrical devices in order to sense the temperature of the windings is disclosed having an improved liquid tight seal to prevent seepage into the switch of varnish or other liquids to which the windings are subjected during assembly. The switch has a two part metallic housing with lips of one part clamped to the other part with an electrically insulating gasket interposed between the two parts. After assembly of the switch the gasket material is softened and the lip is subjected to a force to deform the gasket material, wetting the housing contiguous to the gasket and forming fillets therebetween to completely fill in any voids between the gasket and the contiguous housing.

US Patent:

59034181, May 11, 1999

Filed:

Feb 24, 1998

Appl. No.:

9/028722

Inventors:

Keith F. Boivin - South Attleboro MA
Hideharu Furukawa - Attleboro MA
Radi Pejouhy - Wolfeboro NH

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02H7/00

US Classification:

361 22

Abstract:

Motor protection for air conditioning and refrigeration compressors includes in a first embodiment a cluster block (22) having a seat for a hermetic motor protector (24, 24') and mounting a combination terminal/fusible link (26/26d, 26d') in which the motor protector and combination terminal/fusible link can be exposed to cooling fluid contained in the compressor container and the cluster block is mounted on a lead-through pin (18a) of a header (18) in the container wall. In a second embodiment the cluster block (30) is mounted on all three pins (18a, 18b, 18c) of header (18) with pin connectors received in parallel extending channels (30a, 30b, 30c) of the cluster block. In another embodiment the cluster block (40) is irregular in configuration in order to accommodate available space in certain compressor containers and has a lid (40g) to enclose the motor protector. In another embodiment a base member (52) is tied directly to the stator winding and has a snap-on member (58) to capture the motor protector (24) in the motor protector seat.

US Patent:

42874998, Sep 1, 1981

Filed:

Dec 29, 1978

Appl. No.:

5/974454

Inventors:

Radi Pejouhy - Marshfield MA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H01H 6100

US Classification:

337 97

Abstract:

A current interrupting device having improved contact life includes a hermetically sealed housing in which a thermostatic member is adapted to cause electrical contacts to move into and out of engagement depending on the temperature of the thermostatic member. The atmosphere within the housing is a gas having a dielectric strength slightly over the impressed voltage.

US Patent:

45368171, Aug 20, 1985

Filed:

Mar 10, 1983

Appl. No.:

6/473848

Inventors:

Radi Pejouhy - Marshfield MA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02H 504

US Classification:

361105

Abstract:

An electrical lighting fixture adapted for recessed mounting has structure for mounting and energizing a lamp and has an insulation detecting protector device adapted to interrupt operation of the lamp to prevent overheating of the fixture if thermal insulation is disposed around the fixture in such a way as to excessively block heat dissipation from the fixture. The protector device has structure for mounting the device on the fixture to be subject to representative fixture conditions, has a thermally responsive switch which is actuatable in response to heating to a selected temperature for interrupting operation of the lamp, and has an electrical resistance heater which is thermally coupled to the switch for actuating the switch if thermal insulation excessively blocks dissipation of heat from the protector device. Thermal barrier elements are incorporated in the leads which connect the switch and heater to a power source and to the lamp and limit heat-transfer out of the protector device via the leads to a minor proportion of the heat output of the heater, thereby to permit operation of the heater at a low power level while assuring that the protector device prevents overheating of the fixture and avoids nuisance interruption of the lamp even during anticipated levels of variation in line voltage and ambient temperature.

US Patent:

47137177, Dec 15, 1987

Filed:

Nov 4, 1985

Appl. No.:

6/794876

Inventors:

Radi Pejouhy - Marshfield MA
Joseph G. Nield - Cumberland RI
John R. D'Entremont - Foxboro MA
Fabrizio Rotulo - Napoli, IT

Assignee:

Texas Instruments - Dallas TX

International Classification:

H02H 308
H02H 504

US Classification:

361 26

Abstract:

A motor protector having a thermostat metal element thermally coupled to an electrical motor in a refrigerator compressor motor system has a heater responsive to motor current thermally coupled to the thermostat metal element and has an improved component arrangement to provide locked rotor and ultimate trip protection for the motor without requiring calibration of the operating temperature for the protector after assembly or after incorporation in the motor system.

US Patent:

40414329, Aug 9, 1977

Filed:

Sep 16, 1975

Appl. No.:

5/613789

Inventors:

Norman Yarworth - Attleboro MA
Radi Pejouhy - Marshfield MA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H01H 3754

US Classification:

337111

Abstract:

A motor protector for use in motors having a high operating temperature employs a snap-acting composite thermostat element to actuate the protector wherein the multilayer thermostatic material embodied in the element has an electrical resistivity value from 20 ohms/c. m. f. to 400 ohms/c. m. f. and a flexivity value from 90. times. 10. sup. -. sup. 7 inches per inch per degree Fahrenheit to 110. times. 10. sup. -. sup. 7 inches per inch per degree Fahrenheit to provide for better calibration, longer life, and better space control in the protector for use in motors having higher operating temperatures.

US Patent:

41141270, Sep 12, 1978

Filed:

Sep 30, 1976

Appl. No.:

5/728350

Inventors:

Radi Pejouhy - Marshfield MA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H01H 6100

US Classification:

337 97

Abstract:

A current interrupting device having improved contact life incorporates a thermostatic member adapted to cause electrical contacts to move into and out of engagement depending on the temperature of the thermostatic member. The device is evacuated and back-filled with a mixture of argon and helium and then hermetically sealed.