Raman Jain

 Profile Answers by Raman Jain Questions by Raman Jain

• Nov 9th, 2008

 

Though the kW rating of both driven equipments are same i.e. 15kW but the RPM requirement is different. We can use the same motor with the reduction gear box.

thomas_alva_edison

 Profile Answers by thomas_alva_edison 

• Nov 19th, 2008

 

If the application is designed to be driven by a 15 Kw, 960 RPM motor, then:If you directly connect a 15 kW, 1450 RPM motor, you will be driving the equipment 50% faster than it is designed to operate and it will require at least 50% more power to operate at that speed. Unless the original motor was 50% larger than it needed to be, the substitute motor will be overloaded by 50%. In other words, it will not likely operate successfully.If you connect a 15 kW, 1450 RPM motor through a 1.5:1 speed reduction, it should run fine. The only drawback is the need for a speed reducer. A pair of pulleys and a belt will require only a very small amount of additional power due to additional friction.A VFD could be used to operate at the proper speed, but the available torque and power would be only 66% of what the load presumably requires.

awanish75

 Profile Answers by awanish75 

• Nov 20th, 2008

 

IR value/winding resistance (should be same for three phase) should be checked in HT motor but in IT IR value will only do.