4 pole motors run at 100 Hz
4 pole motors run at 100 Hz
(OP)
Does anyone have any experience of running a large AC 4 pole induction motor at 100Hz this design has been offered to drive a pump with a 3000 rpm top speed < however the pump will normalyy run in the 2200 to 3000 speed range . The reason I was offered this solution was that the 2 pole motor originally offered was in reasonace at 1800 to 2600 rpm. A suitable 2 pole stiff rotor design does not appear to be available. We would be controlling the motor Via a Robicon VSD. Would we have torque issues above 50 Hz or can a motor be wound to reflect 100Hz as being its as manufactured top speed.





RE: 4 pole motors run at 100 Hz
I think the motor V/f will be controlled by the VFD and if the motor is designed to withstand the higher voltage (twice the rated in this case), there shouldn't be any problem. If the motor is matched with the drive (which it should be), the above aspect would have been taken care.
Speed is proportional to speed, so at 100Hz, you should have no problem reaching 300rpm with a four pole motor.
Torque is proportional to Vsquared. Hence, I guess the torque while working 3000rpm should be four times the rated torque at 50Hz and 1500rpm.
RE: 4 pole motors run at 100 Hz
RE: 4 pole motors run at 100 Hz
RE: 4 pole motors run at 100 Hz
Bearing? - doubling the speed will have effect.
Cooling will increase - assuming a fan will run at same speed as motor.
VFD need to set properly for V/F, A, V, I limits and temperature protections.
NC
RE: 4 pole motors run at 100 Hz
Rewinding a motor suitable for 100Hz as base frequency would require a very specialist knowledge in my view and chances are it would not be practical.
Unless you increase the size of motor and VFD then it will not produce the torque you need assuming the motor/VFD are sized correctly. So on this basis, it would be more prudent to look at a decent 2 pole motor.
RE: 4 pole motors run at 100 Hz
You would also get rated torque out of the motor for the full speed range up to 100hz. This means that a 100hp motor, for example, would be producing 100hp at 50hz and 200hp at 100hz.
RE: 4 pole motors run at 100 Hz