Load monitoring circuit for electric motors

Details Load monitoring circuit for electric motors Load monitoring circuit for electric motors

1984-03-26

1985-05-14

Dobeck, B.

Electricity: motive power systems

Automatic and/or with time-delay means

Motor load, armature or primary or secondary circuit current

318334, 318430, 318445, H02P 118

Patent

active

045175020

ABSTRACT:
Disclosed is a monitoring circuit responding to different operational conditions of an electric motor. The circuit includes a measuring resistor connected in series with the stator winding of the motor to produce an actual load value signal. The actual value signal is applied to one input of a comparison circuit whose other input is consecutively supplied with three different nominal reference voltages corresponding to principle operational conditions of the motor, namely to the starting phase, to the normal operational phase, and to an overload. The source of the variable reference voltage includes switching transistor cooperating with a timing member and with voltage dividers adjustable from zero to a maximum nominal voltage value corresponding to the power supply voltage.

REFERENCES:
patent: 3373330 (1968-03-01), O'Brien
patent: 3445725 (1969-05-01), Molen
patent: 4103317 (1978-07-01), Krick
patent: 4195254 (1980-03-01), Gurwicz et al.
patent: 4220900 (1980-09-01), Mintz
patent: 4288828 (1981-09-01), Kuntner
Conference paper, 1977 Electrical & Electronics Engrs. Tenth Convention, Tel Aviv, Israel (Oct. 10-13, 1977), pp. 97-99.

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