Reducing induction motor starting current using magnetic energy recovery switch (MERS)

A high transient current occurring when starting up an induction motor can lead to voltage dip. This paper proposes a method of induction motor soft-starting by using magnetic energy recovery switch (MERS). The MERS is a series compensation device and is able to control motor terminal voltage. The design of MERS control system is described. The starting current produced can be controlled by setting up the MERS firing angle. Experimental results confirmed that starting current can be reduced by applying MERS in series with induction motor.