Starter for a line start electric motor
AssigneeDanfoss Compressors GmbH
InventorNiels Christian Weihrauch
Life of this patent
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Abstract
The invention concerns a starter for a line start electric motor having at least one main winding (4) and at least one start winding (12) and which start winding is connected in series with a run capacitor (14) with which a start capacitor (17) and a PTC-thermistor (19) are connected in parallel. In order to make a simply constructed starter for a line start electric motor the start capacitor (17) and the PTC-thermistor (19) are connected in series with a switch mechanism (20). The series connected circuit made up of the start capacitor (17), the PTC-thermistor (19) and the switch mechanism (20) is connected in parallel with the run capacitor (14).
Claims15
A starter for a line start electric motor having at least one main winding and at least one start winding and which start winding is connected in series with a run capacitor with which a start capacitor and a PTC-thermistor are connected in parallel wherein the start capacitor and the PTC-thermistor are connected in series with a switch mechanism, with the series circuit comprising the start capacitor, the PTC-thermistor and the switch mechanism being connected in parallel with the run capacitor, wherein the switch mechanism is controlled in dependence on time.
A method for the control of a starter for a line start electric motor having at least one main winding and at least one start winding and which start winding is connected in series with a run capacitor with which a start capacitor and a switch mechanism is connected in parallel, wherein the switch mechanism upon the starting of the line start electric motor is open and is then first closed when the alternating current voltage across the run capacitor reaches the level, of the direct current voltage across the start capacitor.
A method for the control of a starter for a line start electric motor having at least one main winding and at least one start winding and which start winding is connected in series with a run capacitor with which a start capacitor and a switch mechanism is connected in parallel, wherein the switch mechanism upon the starting of the line start electric motor is closed and is then first opened after the running of a predetermined time period.
Dependencies are inferred from the claim text.