摩托托尼软起动器走进常春藤——为康奈尔大学提供13.8KV绕线电动机软起动器

Wound  Rotor Motor 13.8 KV 3500 HP

Another  successful startup of the Wound Rotor Motor 3500 HP 13.8 KV chiller for Cornell  University.  Below is the picture of the 13.8 KV unit before shipping from the  factory. It should be noted that we provided the resistor and a PLC to control the timing of shorting the resistor during the ramping. Cornell University has a  very sophisticated chiller system for chilled water for the entire campus.  Instead of using water towers – Cornell uses a heat exchanger from a nearby  river. The University was very concerned with the starting current from wound  rotor motor. The University was extremely happy with the Soft Start as the Wound  Rotor motor successfully started at 2.5 times current in about 14  seconds.

The Wound Rotor Control  

The Wound Rotor Motor is  controlled by our PLC which senses the voltage on the rotor’s resistor and  adjusts the closing of the shorting contactor.  The PLC activates the shorting  contactor during the ramping. The resistor voltage is feedback to the PLC to  sense when the motor is at about 60% speed and once the voltage on the rotor  resistor reaches a the level the contactors pulled in. The entire event is  extremely smooth and done under full control of current limit or the power  ramp. A  picture of the motor is below

Works on a  Generator

Cornell University has two buses one from the local utility  feed picture attached and one from a diesel generator. The MVC  functions   beautifully on  the diesel generator. The generator wobbled slightly during the  acceleration but the MVC  tracts the generator and provided a very smooth and  controlled acceleration.

Bus 1 and  2