Here is some experience from marine business: we calculate the maximum s.c. by taking into account all generators running in parallel and adding the contribution from the motors (except those fed through frequency converters). Minimum s.c. is calculated with only one generator connected (the...
I haven't done many starters in my life, but have checked some drawings from more experienced colleagues. My job is in shipbuilding where the most usual application of Dahlander motors is for dual speed pumps such as firefighting (high speed) / bilge or ballast (low speed), or for certain...
I read in some papers that synchronous motors tend to have a slightly better efficiency than induction motors, and that even a difference of 1-2% can bring significant savings over time when we talk about motors rated 10 MW or more.
Iron losses depend on induction and frequency. If we increase voltage and frequency proportionally the induction remains constant, but frequency is neverheless increased. Even if we keep the current around nominal, thus keeping the copper losses constant, we should have some increase in overall...
But voltage and frequency can be increased up to a certain point. I suppose the limiting factor for the voltage is insulation, and for the speed the mechanical properties of the motor, maybe the bearings? Can someone explain more?
Hello! This is my first post on this very interesting forum which I have been reading for many months. I am not sure if this topic should have been opened in "Electrical Enclosures and Electronics Packaging" section, but I guess it's OK here too.
According to IEC it is usual to give a...
