Commercial compressor with electronic start device for the start of the electric motor
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United States of America Patent
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Jul 17, 2018
Grant Date -
Mar 15, 2018
app pub date -
Apr 5, 2016
filing date -
May 12, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A compressor for commercial refrigerators comprises an electric motor having a start winding (120) and a run winding (130), in which the input terminals of the start winding (120) and the run winding (130) are connected together and to the line voltage (L), and an electronic start device to supply the start winding (120) during a starting period. The electronic start device comprises a run condenser (40) having a first terminal connected to the output terminal from the start winding (120) and a second terminal connected to the output terminal from the run winding (130), and a start capacitor (45) having a first terminal connected to the output terminal of the start winding (120). In the electronic start device there is also provided a solid state switch (110) which supplies the start winding (120) and is connected between the second terminal of the start capacitor (45) and the neutral terminal of the supply (N), and a control circuit (100) comprising a delay circuit (210, 220) which controls switching of the solid state switch (110) closing it to start the motor and opening it at the end of the starting period once the motor has started.
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