Mostly, inverter capacity is set as same capacity of the motor.
But sometimes inverters are set at higher level compared to the motor.
The reason for this setting is to provide more stability if there are a lot of regenerative energy or are used as heavy duty. In such environment, inverter capacity should be larger than the motor but not exceed twice the motor capacity.
Lastly, it is very important not to use a motor capacity that is larger than the inverter capacity.