Motor protection circuit

Details Motor protection circuit Motor protection circuit

1974-09-06

1976-08-10

Rubinson, Gene Z.

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318481, 318484, 317 41, H02H 504

Patent

active

039744302

ABSTRACT:
A motor protection circuit employs a resistance bridge circuit with one side having multiple branches containing temperature responsive resistances for sensing an overheat condition in the motor. Semiconductor voltage sensing devices, such as high gain amplifiers, are responsive to voltages between a standard sensing node and each of the sensing nodes in the multiple branched side of the bridge circuit. Logic facilities respond to any of the sensing devices to operate switching facilities controlling energization of the motor. Additionally, the protection circuit may include a lubricating oil pressure responsive control which is not affected by power loss or spurious signals, and which may be controlled by the operation of a motor control switch.

REFERENCES:
patent: 3742303 (1973-06-01), Dageford
patent: 3753043 (1973-08-01), Plouffe
patent: 3777240 (1973-12-01), Neill

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