To answer this question, we need to start by answering: What is the difference between ‘Starts per hour’ and ‘Number of consecutive starts’? How can it used to specify an LRS for an 8MW Ball mill at an ambient temperature of 42°C? A) Starts per Hour * “Starts per Hour” is defined for the purposes […]
WHEN DO I NEED A COOLER FOR MY LRS? Read More »
Large grinding mills, typically 5 MW or bigger, use wound rotor induction motor drive-trains as high starting torque is required. The first 20 seconds during the start-up of a Wound Rotor Induction Motor is the most stressful time for the rotor circuits and it is during this time that things often go wrong. Standard motor
ADVANCED WOUND ROTOR INDUCTION MOTOR PROTECTION Read More »
Question: The LRS installed on a 1MW crusher is experiencing trips. What about a soft starter solution? According to our understanding a soft starter will not be able to supply the required starting torque for this application? What are the preferred starting methods for MV slip ring motors sized at about 1MW? Answer: With a
MY LRS IS EXPERIENCING TRIPS Read More »
INTRODUCTION A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Wound-rotor motors can be started with low inrush current, by inserting high resistance into the
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