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US 9,755,554 B2Granted
Apparatus and means for progressive motor start based on current derivative synchronisation
AssigneeSchneider Electric Industries SAS
InventorsDelcho Penkov, Alain Dentella, Yann Herriot
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Abstract
A method for controlling a switch that controls a power supply line of an electric motor from an alternating voltage source, including determination of a switch closing instant (tf) starting from a measurement of the derivative of the current carried on the power supply line. A starter system and a computer program product are capable of using this method.
Claims13
A method for controlling a switch that controls an electric motor power supply from an alternating voltage source through a power supply line, comprising:
- measuring the derivative of the current carried on the power supply line;
- and
- determining a switch closing instant from the measured derivative of the current carried on the power supply line,
- wherein determining the switch closing instant includes detecting the instants at which the derivative of the current passes through zero and calculating, from said instants, the frequency of a transient voltage appearing at the terminals of the switch following a passage through zero of the current passing through the switch when the switch is opened.
1 more element
Dependencies are inferred from the claim text.