Alternating current motor protection system

Details Alternating current motor protection system Alternating current motor protection system

1981-07-02

1983-04-26

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 93, H02H 308, H02H 326

Patent

active

043815316

ABSTRACT:
A system for protecting a three-phase motor is disclosed. The system includes a signal conditioning circuit which senses the magnitude of current flowing through each motor phase and generates a single-line, three-phase voltage output signal having each of its phases corresponding to a single motor current phase. This three-phase voltage output signal is efficiently utilized by a microcomputer system to detect motor current overload and motor current imbalance. The microcomputer system instructs a motor controller to shut down the motor in response to a motor current overload or motor current imbalance.

REFERENCES:
patent: 3814986 (1974-06-01), Zanini
patent: 3919600 (1975-11-01), Sons
patent: 4103317 (1978-07-01), Krick
patent: 4219858 (1980-08-01), De Puy et al.
patent: 4234901 (1980-11-01), Strickland, Jr.
patent: 4335413 (1982-06-01), Engel et al.

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