Since the switching device of the inverter is a high-power transistor, its overcurrent capability is smaller than that of the thyristor, so whether the capacity selection is correct or not is directly related to its safety.
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Match the power and load of the motor. The ability of the same capacity inverter to drive the motor varies with the nature of the load on the motor. For motors of the same power, the capacity of the inverter required for different load characteristics is also different. The capacity of the frequency converter required for the square torque load (fan) is lower than that of the constant torque load. Under normal circumstances, the inverter has directly given the rated power or apparent power suitable for driving the motor. In the chemical industry, for the square torque load such as fan and water pump, the corresponding inverter can be selected according to the motor power. In addition, the capacity of the inverter must be increased in the following cases:
1 The motor starts a load with a large mechanical inertia in a short time;
2 requires the motor to frequently increase and decrease;
3 In the desired acceleration and deceleration time, the maximum current of the motor is greater than the overload capacity of the inverter (when the rated current is 1.5 times within 1 min). In the above case, the inverter cannot be selected simply by the motor power.
Light-duty motors are not free to be equipped with small-capacity inverters. The motor has a large horse-drawn carriage, and the power output is insufficient. Although the motor allows the inverter to be slightly smaller than the nominal power of the motor, the larger the capacity of the motor, the smaller the inductance, and the ripple current component caused by the harmonics will increase. Therefore, when the load of the asynchronous motor is small, it is desirable to use a small-capacity inverter. On the one hand, it is necessary to consider that the no-load current of the large-capacity motor is large, and once the load is loaded, the total load current exceeds the rated current of the inverter, and the other The aspect is that it must be noted that the above pulsating current will increase.
The correct selection of the V/f graphics of the inverter. For 50Hz, 380V AC asynchronous motor, in the actual operation, the appropriate Vif pattern should be selected according to the actual needs and the working range allowed by the motor. In the chemical industry, the frequency converter is mainly used for the speed regulation of the pump. Therefore, when selecting the Vif pattern, it should generally meet the condition that the output frequency and the maximum output frequency are both 50 Hz when the rated voltage is 380V. The selection of the Vif pattern of the inverter for the pump speed control of our factory is selected according to the above principles.
The selection of the torque boost curve. The torque boost can effectively increase the output torque of the motor. If the curve is too small, the output torque of the motor is insufficient, and the starting is difficult; if the selection is too large, the saturation loss of the motor flux increases accordingly, and the increase in the temperature rise of the motor is not conducive to energy saving. Therefore, when selecting the torque boost curve, we should choose according to the nature of the load.