Illinois Tool Works Inc.

Minu L.l.c.

Ermanno Pinotti

Ezio Puppin

Daniele Turetta

A compressor for commercial refrigerators comprises an electric motor having a start winding () and a run winding (), in which the input terminals of the start winding () and the run winding () are connected together and to the line voltage (L), and an electronic start device to supply the start winding () during a starting period. The electronic start device comprises a run condenser () having a first terminal connected to the output terminal from the start winding () and a second terminal connected to the output terminal from the run winding (), and a start capacitor () having a first terminal connected to the output terminal of the start winding (). In the electronic start device there is also provided a solid state switch () which supplies the start winding () and is connected between the second terminal of the start capacitor () and the neutral terminal of the supply (N), and a control circuit () comprising a delay circuit () which controls switching of the solid state switch () closing it to start the motor and opening it at the end of the starting period once the motor has started.

Commercial compressor with electronic start device for the start of the electric motor

A motor starter circuit particularly for compressors of refrigerators, comprising a starter device (), adapted to be connected to a starter winding () and to a steady-state winding () of an asynchronous motor, the windings () being in turn connected to a power supply line (), a capacitor () being connected in parallel to the starter device (), and further comprising a heat-sensitive element (), which is adapted to be connected between the starter device () and the capacitor () and the starter winding ().

Motor starter circuit, particularly for compressors of refrigerators

A starter circuit for motors, particularly for refrigerator compressors, comprising a starter device which is adapted to be connected to a starter winding and to a steady-state winding of an asynchronous motor, the windings being in turn connected to a power supply line, a capacitor being connected in parallel to the starter device; the starter circuit further comprises a resistive element which is adapted to be connected between the starter device and the capacitor, in order to limit a discharge current of the capacitor on the starter device.

Motor starter circuit, particularly for refrigerator compressors

A motor starter circuit, particularly for a motor of refrigerator compressors, comprising means for generating time-decreasing pulses adapted to drive switching means which are connected to the motor to be started, the means for generating time-decreasing pulses being AC-powered.

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Bergamo, Italy

Ermanno Pinotti