Auto transformer starters are used generally with AC squirrel cage motors having a power rating of more than 20 HP. Motors of these power ratings draw excessive starting current with the use of Star/Delta starter. This may cause excessive strain on the motor and creates an intense voltage dip. This can prove harmful for the motor […]
Hi friends, in this article, I am discussing the vfd working principle and hope you will find it very help full and informative. The squirrel-cage induction motors are the most common three-phase motors used in industrial applications. The preferred method of speed control for squirrel-cage induction motors is to vary the frequency of the supply voltage, and the system
Synchronous motors have their pole-shoes slotted for placing copper bars. The copper bars are placed in these slots and short-circuited at both ends by heavy copper rings (like squirrel cage rotor of induction motors). This arrangement is known as damper winding in synchronous motor. Role of Damper Winding in Synchronous Motor The damper winding in