The relationship curve between the load rate β and the power η of the inverter can be seen: when β = 50%, η = 94%; When β = 100%, η = 96%. Although the β has doubled, the η change is only 2%, but it is also considerable for medium to high power (a few hundred kilowatts to several thousand kilowatts) electric motors. The system power is equal to the product of the power of the inverter and the power of the motor. From the power point of view, the following points should be paid attention to when selecting the power of the inverter.
(1) The power of the inverter is the most suitable for the power of the motor, so as to facilitate the inverter to work in a high-power state.
(2) If the power classification of the inverter is not in phase with the power classification of the motor, the power of the inverter should be as close to the motor as possible
and should be slightly greater than the power of the motor.
(3) When the motor is frequently started, braked or started under heavy load and is more frequent, a larger inverter can be selected to facilitate the inverter to run for a long time and safely.
(4) After testing, the practical power of the motor is indeed sufficient, and the inverter with power less than the motor power can be considered, but it is necessary to pay attention to whether the instantaneous peak current will form an overcurrent maintenance action.
(5) When the power of the inverter and the motor are not together, the setting of the energy-saving program must be adjusted accordingly to achieve a higher energy-saving effect.
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