50Hz 60Hz Converter, Inc.

50Hz 60Hz Converter, Inc.

216 N. Oakley Blvd.
Chicago, Illinois 60612
Phone: 312-380-0596
About the Company

My assumption is that you have a solid converter with quite a high flux density below the rotor slots, and the problem is high eddy-current losses in this steel at start and at full load. This is particularly significant on 2 pole machines, and still on 4 pole 50Hz/60Hz machines. Can you can your shaft / rotor body to Stainless Steel and retest?

You will run with higher speed than nominal, but with higher than nominal slip. I think,that it can draw too much current, it is because You will run in flux weakening zone. To produce the nominal motor torque - You will need more than nominal current. It depends what is the application - if it is fan or pump You can get over current (breaker trip or damaged insulation in long term operation) because in fan or pumps: torque = k* speed ^2. Motor is 3 phase and 50 kw which is driving cooling pump. As i only receive 220v (230v, 240v) 50 hz motor instead of (110v, 120v) 60 hz i have to install it, motor is connected in star / delta connection.