ab powerflex4 drive overspeeding questions

[spidermonkey]

We have a powerflex4 drive I am going to over speed or overclock take from 60hz to a 100hz

Any reasons you would suggest not doing this
I just think that we will have heat issues

 

[James Mcquade]

I need a few details.
voltage, hp, motor application, distance from vfd to motor,
what is motor driving.

regards,
james

 

[shooter]

the iron losses will be bigger so the motor will get hotter.
but if the load is not to big it should work, just fine.

 

[DickDV]

The first and by far the most important question when determining the maximum speed is "what is the maximum SAFE speed?".

If you are sure you are below that, then the issues are all about the motor, not the drive.

First, are you sure the available continuous motor torque is higher than the required continuous load torque?

Second, are you sure the available short-term overload torque is higher than the required short-term overload torque? Remember, the short-term torque goes down as a function of the inverse of overspeed SQUARED.

Can the power train take the extra speed? Some gearboxes cannot due to lubricant foaming issues.

While iron losses may increase, the increase will be very small and insignificant. The higher fan speed will handle any increase in heat easily.

Finally, make sure the motor is mechanically capable of the higher speed. In a 5hp 4 pole motor, there are few concerns. In a 300hp 449TS frame two pole motor, there are major concerns, some even involving life safety.

 

[Jeff23spl]

Almost everything get mentionned as sometimes peoples think you just need to boost the frequency to get more work done in the same time but yes each parts need to be able to handle it.

starting from mecanical inertia... sometimes just what hold the copper bar on the motor rotor will just goes away at that speed or bearing gear box etc.
Like it was said it won't be a drive issue...

Motor need to be way oversized as the voltage doesn't increase past 60hz but motor impedance do increase for a lower current making less torque...

In some application we do it to re-gain the speed off 60hz on a 50hz installation...or just to maximize the work when their is less load on the mecanic but i never increased to 100hz under load...