How much speed of a motor we can increase beyond rated speed with the help of VFD / Ac drive
In certain applications we need to increase the speed of a motor beyond its rated speed in such cases before increasing the output hz of VFD you should consider few things.
Load on the shaft of motor should be considered. If load is too high and motor is drawing full rated current than you should not Increase the speed of motor. If you do so motor may not be able to drive the load. When you increase speed beyond rated RPM. Output torque of VFD will drop.
If you still need to increase the speed of motor we suggest to replace motor and VFD to one size higher as per your application.
- Capacity of Motor
You will need to check whether your motor can run at high speed. Because most of the motors are not meant to run at high speed above rated speed. Bearings of motor are designed to run motor at rated RPM. You can easily increase speed by 10-15% without any harm. But if you need to increase speed above than you use special motors which are designed for High RPM.
You can easily find many VFDs which can give output Frequency above 400Hz
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