1. Accounting of inverter capacity when the load is continuously changed periodically
In many cases, the load of the motor changes periodically. Obviously, in this case, picking the capacity of the inverter by the minimum load will be overloaded, and it will be uneconomical to pick by the maximum load. It follows that the capacity of the inverter can be appropriately selected between the maximum load and the minimum load, so that the inverter can be fully utilized without being overloaded.
Firstly, the motor load current diagram n=Φt) and I=f(t) are made, and then the average load current Iav is calculated, and then the capacity of the inverter is pre-selected, and the following formula is used for the calculation of Iav:
Iav＝（I1t1+I2t2+…+Ijtj+…）÷（t1+t2+…+tj+…）
Considering that during the transition process, the electric motor will absorb more current from the inverter than during stable operation, and the above IAV does not reflect the situation in the transition process. Therefore, the capacity of the inverter is pre-selected according to IFN≥ (1.1-1.2) IAV correction (where, Ij is the average current in the j-section operation state, tj is the corresponding time in the j-section operation state, and if the transition process accounts for a large proportion in the whole working process, the coefficient (1.1-1.2) is selected as the larger value.
2. Accounting of inverter capacity when non-periodic change load is running continuously
This kind of scene is generally difficult to make a load current diagram, you can calculate the rated current of the inverter according to the current of the motor when the maximum torque is output, the formula can be used:
IFN≥IM(max)/KFg (where IM(max) is the current of the motor when the maximum torque is output).
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