Apparatus and means for starting of AC motors, algorithm for self-adapting motor start with soft-starter
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United States of America Patent
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Aug 22, 2017
Issued Date -
Oct 29, 2015
app pub date -
Apr 22, 2015
filing date -
Apr 23, 2014
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Abstract
The invention relates to a method of starting an electric motor (10) powered by an alternating power supply voltage, said method consisting of supplying current to the motor (10) with a delay tret, during each period of the power supply voltage. The starting method comprises a first sequence in which the following steps are carried out during each nth period of the power supply voltage, where n is an integer number greater than 0: a) determine the value of a variation of a resistance of the electric motor during the previous n periods of the power supply voltage; b) compare said value of the variation of the determined motor resistance with a first threshold resistance value; c) if the value of the variation of the motor resistance is less than the first threshold value, reduce tret. The invention also relates to a starter device and a computer program.
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