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Many applications have a higher starting torque requirement and it is sometimes a struggle to provide smooth starting performance. VFD starts are known to reduce starting stresses but may not always provide the best overall solution when economics, performance and process control are considered. This paper will review considerations for new and retrofit applications, touching on torques required by...
Synchronous motors (SMS) continue to be a viable alternative to induction motors because of efficiency advantages. Since SMs have long been used to provide leading kvar for power factor (PF) improvement and to help with the device switching in load-commutated inverter (LCI) drives, these machines are efficient prime movers for large mill applications. Both in motor efficiency and in low-base-speed...
Synchronous motors continue to be a viable alternative to induction motors because of efficiency advantages. Long used for providing leading kVARs for PF improvement and helping with the device switching in Load Commutated Inverter (LCI) drives, these machines are efficient prime movers for large Mill applications. Both in motor efficiency and in low base speed configurations the synchronous motor...
High mechanical stresses can lead to premature failure of rotating equipment. Understanding the mechanism causing vibrations helps in proper prediction and monitoring activities to minimize harmful effects of vibrations. This primer provides a mechanical background and measures to mitigate mechanical stresses in rotating equipment involving electric motors and drives. Vibration problems can occur...
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