We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct selection of the type of inverter.
When selecting the inverter, the current value of the actual motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will cause the power factor and power of the motor to deteriorate.
Current matching: For general centrifugal pumps, the rated current of the inverter is consistent with the rated current of the motor. For special loads, such as deep-water pumps, it is necessary to refer to the motor performance parameters to determine the inverter current and overload capacity at the maximum current. The current setting of the inverter should not be less than 1.1 times of the rated current of the motor, and the maximum current is generally set to 1.5 times of the rated current of the motor.
Special applications
For example, high ambient temperature, high switching frequency, high altitude, etc., will cause the derating of the inverter at this moment, and the inverter needs to be expanded by one gear.
When using an inverter to drive a high-speed motor, the output current value increases due to the small reactance of the high-speed motor and the increase of higher harmonics. Therefore, the capacity of the inverter used for high-speed motor is slightly larger than that of general motor.
When driving an explosion-proof motor, the inverter does not have an explosion-proof structure, and the inverter should be set outside the hazardous location.
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