Inverter power selection - Solutions - Huaqiang Electronic Network

Probe domestic high frequency needle JKT-50L high frequency needle with 3 probes

Shunluo Inductance Power Inductor SWPA Series First Class Agent

Photocoupler

The relationship between the inverter load factor β and the efficiency η is shown in Fig. 1. It can be seen from Fig. 1 that when β = 50%, η = 94%; when β = 100%, η = 96%. Although β is doubled, the η change is only 2%, but it is also considerable for medium and high power (several hundred kilowatts to several thousand kilowatts) motors. System efficiency is equal to the product of frequency converter efficiency and motor efficiency. From the perspective of efficiency, the following points should be noted when selecting the inverter power.
(1) When the inverter power is equal to the motor power, it is most suitable to facilitate the inverter to operate under high efficiency.
(2) When the power classification of the inverter is different from the motor power classification, the power of the inverter should be as close as possible to the power of the motor and should be slightly larger than the power of the motor.
(3) When the motor is frequently started, braked or in heavy-duty starting and more frequent, a large-scale inverter can be selected to facilitate long-term and safe operation of the inverter.
(4) After testing, the actual power of the motor does have a surplus. You can consider the inverter with power less than the motor power, but pay attention to whether the instantaneous peak current will cause overcurrent protection.
(5) When the inverter and motor power are not the same, the energy-saving program settings must be adjusted accordingly to facilitate high energy-saving effects.